PART 1. TEXAS COMMISSION ON ENVIRONMENTAL QUALITY

CHAPTER 115. CONTROL OF AIR POLLUTION FROM VOLATILE ORGANIC COMPOUNDS

The Texas Commission on Environmental Quality (TCEQ, agency, or commission) adopts amendments to 30 Texas Administrative Code (TAC) §§115.10, 115.110 - 115.112, 115.114 - 115.119, 115.121 - 115.123, 115.125 - 115.127, 115.129, 115.131, 115.132, 115.135 - 115.137, 115.139, 115.142, 115.144, 115.146, 115.147, 115.149, 115.161, 115.162, 115.164 - 115.167, 115.169 - 115.172, 115.177, 115.183, 115.211 - 115.214, 115.216, 115.217, 115.219, 115.221, 115.222, 115.224, 115.226, 115.227, 115.229, 115.234, 115.235, 115.237, 115.239, 115.311, 115.312, 115.315, 115.316, 115.319, 115.352 - 115.357, 115.359, 115.410 - 115.413, 115.415, 115.416, 115.419, 115.420, 115.422, 115.423, 115.425 - 115.427, 115.429, 115.430 - 115.432, 115.435, 115.436, 115.439 - 115.443, 115.445, 115.446, 115.449 - 115.451, 115.453, 115.458 - 115.461, 115.463, 115.465, 115.468 - 115.471, 115.473, 115.475, 115.478, 115.479, 115.510, 115.512, 115.515 - 115.517, 115.519, 115.531, 115.532, 115.534 - 115.537, 115.539, 115.901, and 115.911. TCEQ also repeals §115.173; and simultaneously adopts new §115.173.

The amendments to §§115.111, 115.131, 115.132, 115.139, 115.171, 115.172, 115.173, 115.219, 115.234, 115.235, 115.237, 115.419, 115.450, 115.459, 115.461, 115.469, 115.479, and 115.519 are adopted with changes to the proposed text as published in the December 15, 2023, issue of the Texas Register (48 TexReg 7290) and will be republished. TCEQ adopts non-substantive changes to update the rules in accordance with current Texas Register style and format requirements, improve readability, establish consistency in the rules, and conform to the standards in the Texas Legislative Council Drafting Manual, September 2020.

All other amendments are adopted without changes to the proposed text as published in the December 15, 2023, issue of the Texas Register (48 TexReg 7290) and, therefore, will not be republished.

All amended sections, and the repealed and new section, will be submitted to the United States Environmental Protection Agency (EPA) as revisions to the State Implementation Plan (SIP).

Background and Summary of the Factual Basis for the Adopted Rules These adopted rules will address federal Clean Air Act (FCAA) reasonably available control technology (RACT) requirements for Bexar County under the 2015 eight-hour ozone National Ambient Air Quality Standard (NAAQS) of 0.070 parts per million (ppm) as well as FCAA RACT and SIP contingency requirements for the Dallas-Fort Worth (DFW) and Houston-Galveston-Brazoria (HGB) nonattainment areas under the 2008 eight-hour ozone NAAQS of 0.075 ppm. The adopted rulemaking will also amend previously adopted rules that addressed EPA's 2016 Control Techniques Guidelines for the Oil and Natural Gas Industry in the DFW and HGB 2008 ozone NAAQS nonattainment areas (Rule Project No. 2020-038-115-AI, adopted June 30, 2021).

The following portion of the Background and Summary addresses the RACT update for Bexar County.

Effective November 7, 2022, EPA reclassified nonattainment areas under the 2015 eight-hour ozone NAAQS (87 Federal Register (FR) 60897). Bexar County was reclassified from marginal to moderate nonattainment with a 2023 attainment year and an attainment deadline of September 24, 2024. Ozone nonattainment areas classified as moderate and above are required to meet the mandates of FCAA under §172(c)(1) and §182(b)(2). According to the EPA's Implementation of the 2015 National Ambient Air Quality Standards for Ozone: State Implementation Plan Requirements: Final Rule (2015 eight-hour ozone standard SIP requirements rule) published in the Federal Register (83 FR 62998), states containing areas classified as moderate ozone nonattainment or higher must submit a SIP revision to fulfill RACT requirements for all source categories addressed by control techniques guidelines (CTG) or alternative control techniques (ACT) as well as any non-ACT/CTG category sources that are classified as major stationary sources of nitrogen oxides (NOX) or volatile organic compounds (VOC) (83 FR 62998). Specifically, the SIP revision must contain adopted RACT regulations, certifications where appropriate that existing provisions are RACT, and/or negative declarations that there are no sources in the nonattainment area covered by a specific CTG source category (80 FR 12264).

Bexar County's reclassification to moderate ozone nonattainment triggered emission control evaluation, emission reduction quantification, rule writing, and submission requirements for attainment demonstration (AD) and reasonable further progress (RFP) SIP revisions. However, neither EPA's reclassification schedule nor its SIP requirements submittal deadline of January 1, 2023, provided sufficient time to implement new VOC emission reduction controls prior to the beginning of the attainment year ozone season in Bexar County, which was March 1, 2023. The portions of this adopted rulemaking affecting Bexar County, along with the concurrently adopted Bexar County RACT Update SIP Revision (Non-rule Project No. 2023-132-SIP-NR), are intended to address the emission control and RACT analysis requirements.

On October 12, 2023, Texas Governor Greg Abbott signed and submitted a letter to EPA to reclassify the Bexar County, DFW, and HGB moderate 2015 eight-hour ozone NAAQS nonattainment areas to serious. On October 18, 2023, EPA published a finding of failure to submit the required moderate AD SIP revisions for all three areas. The commission is proceeding with this rulemaking that addresses RACT in Bexar County since RACT is required for both moderate and serious nonattainment classifications.

All Bexar County VOC emission source categories addressed by CTG and ACT documents were evaluated. 30 TAC Chapter 115 or other approved regulations were developed to update and fulfill RACT requirements. RACT requirements are fulfilled for all non-CTG and non-ACT major VOC emission sources-those for which VOC controls are technologically and economically feasible-by new, updated, or existing 30 TAC Chapter 115 rules and other federally enforceable measures, as documented in the concurrently adopted SIP revision.

The rule revisions to update RACT requirements in Bexar County are adopted in 19 divisions of Chapter 115. Subchapter B, Division 1 Storage of Volatile Organic Compounds, Division 2 Vent Gas Control, Division 3 Water Separation, Division 4 Industrial Wastewater, Division 6 Batch Processes, and Division 7 Oil and Natural Gas Service in Ozone Nonattainment Areas contain adopted revisions. Subchapter C contains adopted revisions in Division 1 Loading and Unloading of Volatile Organic Compounds, Division 2 Filling of Gasoline Storage Vessels (Stage I) for Motor Vehicle Fuel Dispensing Facilities, and Division 3 Control of Volatile Organic Compound Leaks from Transport Vessels. Subchapter D contains adopted revisions in Division 1 Process Unit Turnaround and Vacuum-Producing Systems in Petroleum Refineries, and Division 3 Fugitive Emission Control in Petroleum Refining, Natural Gas/Gasoline Processing, and Petrochemical Processes in Ozone Nonattainment Areas. In Subchapter E, adopted revisions are in Division 2 Surface Coating Processes, Division 3 Flexographic and Rotogravure Printing, Division 4 Offset Lithographic Printing, Division 5 Control Requirements for Surface Coating Processes, Division 6 Industrial Cleaning Solvents, and Division 7 Miscellaneous Industrial Adhesives. Subchapter F, Division 1 Cutback Asphalt, and Division 2 Pharmaceutical Manufacturing Facilities contain adopted revisions. In these divisions, applicability and compliance provisions for existing RACT rules are amended to add provisions for Bexar County. Adopted changes are also made in Subchapter A, Definitions, and Subchapter J, Division 1 Alternative Means of Control to implement these RACT updates in Bexar County. Revisions to Subchapter B, Division 1 in the DFW area implement major source RACT at the lower 25 tons per year (tpy) major source threshold for the severe nonattainment classification and in Bexar County at the 100 tpy threshold for moderate areas. Likewise, Subchapter B, Division 2 revisions implement RACT for bakery vents at the major source thresholds in DFW and Bexar County. In all other divisions, Bexar County is added to rule provisions with the most stringent requirements for RACT implementation. All adopted regulations have a compliance date of January 1, 2025.

In addition to the adopted rules to address RACT for the Bexar County 2015 ozone NAAQS moderate nonattainment area, the adopted rulemaking will address RACT requirements for the DFW 2008 ozone NAAQS severe nonattainment area and contingency requirements for the DFW and HGB 2008 ozone NAAQS severe nonattainment areas. Effective November 7, 2022, EPA reclassified nonattainment areas under the 2008 ozone NAAQS (87 FR 60926). A 10-county DFW area (Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties) and an eight-county HGB area (Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties) were reclassified from serious to severe nonattainment with a 2026 attainment year and an attainment deadline of July 20, 2027. Reclassification to severe nonattainment triggers emission control evaluation, emission reduction quantification, rule writing, and SIP submission requirements for the DFW and HGB 2008 ozone NAAQS nonattainment areas that must be submitted to EPA by May 7, 2024, the deadline established in EPA's reclassification action for the 2008 ozone NAAQS. This adopted rulemaking will amend Subchapter B, Division 1 VOC storage provisions to address RACT in the DFW 2008 ozone NAAQS severe nonattainment area and will amend rules in Subchapters E and F to address SIP contingency requirements for the DFW and HGB 2008 ozone NAAQS nonattainment areas.

The adopted rulemaking will add provisions for six measures to be implemented if needed for SIP contingency purposes in the DFW and/or HGB 2008 ozone NAAQS nonattainment areas. Contingency measures are control requirements that will take effect and result in emissions reductions if an area fails to attain a NAAQS by the applicable attainment date or fails to demonstrate RFP. Requirements for SIP contingency are established under FCAA, §172(c)(9) and §182(c)(9). Requirements for five contingency measures are adopted in Subchapter E: degreasing contingency rules are adopted in Division 1; industrial maintenance coatings and traffic marking coatings contingency rules are adopted in Division 5; industrial cleaning solvents contingency rules are adopted in Division 6; and industrial adhesives contingency rules are adopted in Division 7. A sixth contingency measure is adopted in Subchapter F, Division 6 for emulsified asphalt paving in the DFW and/or HGB 2008 ozone NAAQS severe nonattainment areas. Adopted contingency measures will apply independent of each other and separately for the DFW and/or HGB 2008 ozone NAAQS severe nonattainment areas. Implementation of a contingency measure will be triggered upon EPA publication of a notice in the Federal Register that the specified area(s) failed to attain the applicable ozone NAAQS by the applicable attainment date or failed to demonstrate RFP, and the commission's subsequent publication in the Texas Register that compliance with the contingency measures is required. Affected sources will be required to comply with the contingency rules by no later than 270 days after Texas Register publication.

Staff inadvertently omitted some source categories and incorrectly stated multiple VOC content limits for other source categories in the industrial adhesives contingency measure of this rule proposal. This resulted in less emissions reductions available to fulfill contingency requirements in the DFW and HGB areas. The Executive Director intends to immediately initiate rulemaking for commission consideration to restore the missing and incorrect VOC content limits to achieve the reductions originally intended.

In addition to adopted amendments to address SIP contingency requirements for the DFW and HGB 2008 ozone NAAQS nonattainment areas, to address RACT requirements for the Bexar County 2015 ozone NAAQS moderate nonattainment area, and to address RACT requirements for the DFW 2008 ozone NAAQS severe nonattainment area, this adopted rulemaking will also amend Subchapter B, Division 7 to clarify provisions adopted June 30, 2021 (Project No. 2020-038-115-AI) to implement the EPA's 2016 Control Techniques Guidelines for the Oil and Natural Gas Industry. The adopted amendments will also delete rule provisions that would be triggered by the action of Wise County no longer being designated as nonattainment under the 2008 ozone NAAQS. This action will not occur because the petition for review seeking reversal of the nonattainment designation was denied on June 2, 2015, by the U.S. Court of Appeals for the District of Columbia Circuit (Mississippi v. EPA, 790 F.3d. 138). Similarly, the adopted amendments will delete rule provisions that would be triggered by reclassification of the DFW area to severe nonattainment for the 1997 eight-hour ozone NAAQS because the 1997 eight-hour ozone NAAQS was revoked when the 2008 ozone NAAQS was implemented.

Demonstrating Noninterference under Federal Clean Air Act, §110(l) Under FCAA, §110(l), EPA cannot approve a SIP revision if it "would interfere with any applicable requirement concerning attainment and reasonable further progress, or any other applicable requirement of." The commission provides the following information to demonstrate why the adopted changes to the Subchapter B, Division 7 and Subchapter E, Division 7 rules and associated Chapter 115 VOC control requirements will not: negatively impact the status of the state's progress towards attainment, interfere with control measures, or prevent reasonable further progress toward attainment of the ozone NAAQS in the HGB, DFW, or Bexar County nonattainment areas.

On June 30, 2021, the commission adopted rules in 30 TAC §§115.170 - 115.183 (Rule Project No. 2020-038-115-AI) to implement the EPA's 2016 Control Techniques Guidelines for the Oil and Natural Gas Industry (EPA-453/B-16-0012016/10). These adopted rules in Chapter 115 concerning RACT requirements for sources covered by EPA's 2016 oil and gas CTG became effective on July 21, 2021, and they were approved by EPA as a revision to the SIP on August 15, 2023, with an effective date of September 14, 2023 (88 FR 55379). The 2016 oil and gas CTG required covered sources in the DFW and HGB ozone nonattainment areas to comply with specified emissions limitations and control requirements for the oil and natural gas industry sector by January 1, 2023. The Chapter 115 rules currently applicable to oil and gas industry operations in the HGB and DFW nonattainment areas inadvertently omit three CTG recommended exemptions, consolidate control provisions in a format that could be interpreted to deviate from EPA's centrifugal and reciprocating compressor CTG, and fail to include a CTG recommended incentive to maintain good fugitive monitoring performance. The adopted 30 TAC Chapter 115, Subchapter B, Division 7 revisions will add §115.172 CTG recommended exemptions, clarify §115.173 compressor control requirements, and amend §115.177 fugitive emission monitoring provisions to establish rule language that more accurately reflects EPA's 2016 oil and gas CTG rule guidelines.

The commission adopts a §115.172(a)(9) exemption for fugitive components in heavy liquid service from routine §115.177 instrument monitoring requirements provided they are monitored weekly by a visual, audio, and olfactory (OVA) survey as the CTG recommends. The OVA monitoring surveys will identify heavy liquid service leaks quicker than instrument monitoring, because they occur more frequently and typically document leak evidence before an instrument reading above the 10,000 ppm leak definition is observed. Therefore, the adopted §115.172(a)(9) exemption will enable heavily liquid service fugitive component leaks to be identified and repaired sooner to reduce natural gas processing plant VOC emissions.

In §115.172(a)(10), the commission adopts a similar CTG recommended exemption from routine instrument monitoring for natural gas plant light liquid service fugitive components that route potential VOC leaks through a closed vent system to a control device, process or fuel gas system provided weekly OVA survey are conducted. The higher potential emissions from light liquid service components and §115.172(a)(10) control requirement will result in potential VOC emission reductions that are an order of magnitude or larger than produced by the adopted §115.172(a)(9) heavy liquid service exemption.

The commission adopts an exemption for wellhead(s)-only sites from instrument monitoring provisions under new §115.172(a)(11), since they have very limited quantities of fugitive components and associated VOC emissions. Any insignificant VOC emissions increase that may result from the adopted CTG recommended wellhead-only exemption will be more than offset by VOC emission reductions from the new implementation of more frequent OVA monitoring provisions adopted in §115.172(a)(9) and (10). The addition of new §115.172(a)(9)-(11) exemptions will not produce a net increase in VOC emissions or negatively impact the status of the state's progress towards attainment.

The commission inadvertently combined CTG recommended centrifugal and reciprocating compressor classification specific control provisions and created unnecessary confusion over the requirements that apply to each compressor type. The commission's adopted revisions to §115.173 will place the centrifugal and reciprocating compressor control provisions in separate §115.173(a) and §115.173(b) subsections, respectively, with the individual compressor type control provisions specified for each compressor type as recommended in the CTG. The adopted updates will clarify each compressor type's specific control requirements to more precisely conform to CTG RACT guidance. The reformatting of §115.173 compressor control requirements according to compressor type will not increase CTG RACT baseline VOC emissions or negatively impact the status of the state's progress towards attainment. The commission's existing §115.177 fugitive emission monitoring provisions require natural gas plant fugitive components that include light liquid service valves to be initially instrument monitored on a monthly basis and provide an option for quarterly monitored components with good monitoring and repair histories to be monitored less frequently in accordance with CTG recommendations. An oversight in the commission's regulatory language does not currently provide a pathway for fugitive emission components to transition from a monthly to a quarterly monitoring schedule as the CTG recommends as an incentive to encourage good leak repair performance that will reduce VOC emissions. The commission adopts the CTG recommended monitoring schedule pathway as an incentive for industry to expedite the location and repair fugitive component leaks to qualify for pathway access. The commission anticipates that the adopted monitoring schedule pathway requirement to implement and maintain the "good monitoring program practices" will reduce VOC emissions below the current rule's baseline level as a result of the expedited detection and repair practices needed to satisfy qualification criteria. The adopted §115.177 fugitive monitoring pathway language will not produce an increase in VOC emissions or negatively impact the status of the state's progress towards attainment.

The applicability of Subchapter B, Division 7 revisions is limited to the Bexar County, DFW, and HGB areas. The commission's adopted regulatory updates more precisely incorporate CTG RACT recommendations, increase RACT rule effectiveness and result in net VOC emission reductions for the HGB and DFW nonattainment areas. The adopted Subchapter B, Division 7 amendments also implement VOC RACT in Bexar County, which is a requirement of the FCAA and intended to help the area reach attainment, and will not affect Chapter 115 requirements for other areas in Texas. The adopted rulemaking will not negatively impact the state's progress towards attainment of the 2008 and 2015 eight-hour ozone NAAQS, reasonable further progress toward attainment, or any other applicable requirement of the FCAA.

The commission adopts changes to Subchapter E, Division 7, Miscellaneous Industrial Adhesives, to implement a contingency measure required by FCAA, §172(c)(9) and §182(c)(9). This measure, if triggered, would reduce VOC emissions in the DFW and/or HGB areas by revising VOC content limits on various types of industrial adhesives. The changes add new VOC content limits in 30 TAC §115.473(e) and (f) which would apply if the contingency measure were triggered for the DFW or HGB area, respectively. These limits would, upon triggering, replace the current Chapter 115 VOC content limits in the DFW and/or HGB areas with limits taken from South Coast Air Quality Management District (SCAQMD) Rule 1168, as amended November 4, 2022.

Existing TCEQ RACT limits for industrial adhesives are based on the 2008 EPA CTG for Industrial Adhesives. The emission limit recommended in the CTG is based on the 2006 version of SCAQMD Rule 1168. Since 2006, SCAQMD Rule 1168 has been amended twice to establish emission limits for bonding specific substrates. These amendments have accommodated stated industry concerns with the limits in the 2006 version of Rule 1168. Four of the SCAQMD Rule 1168 changes since 2006 have increased the emission limit beyond the limit in existing TCEQ rules. These changes are for pressure sensitive adhesive primers, adhesives to join two specialty plastics, adhesives used in the manufacturing of computer diskettes, and adhesives for structural wood components. The adhesive applications in these categories were new subcategories of previous SCAQMD Rule 1168 and TCEQ adhesive rule categories. TCEQ chose its industrial adhesive contingency measure VOC content limits to equal the SCAQMD Rule 1168 limits adopted November 4, 2022 because TCEQ agrees with SCAQMD's analysis on technological feasibility for these limits. SCAQMD's analysis can be found in SCAQMD's Preliminary Draft Staff Report for Rule 1168- Adhesive and Sealant Applications dated August 2022.

Calculated emissions reductions for this measure sum the reductions in some adhesive categories and the increases in other categories to produce net emission reductions. In the current rulemaking, TCEQ provides the contingency measure emission reductions in a manner that avoids negatively impacting the status of the state's progress towards attainment or preventing reasonable further progress toward attainment of the ozone NAAQS in the HGB and DFW nonattainment areas or any other applicable requirement of the FCAA.

Section by Section Discussion In addition to the information provided above for a background and summary of the adopted rules, including a demonstration of noninterference with §110(l) of the FCAA, the commission also adopts non-substantive changes to update the rules in accordance with current Texas Register style and format requirements, improve readability, establish consistency in the rules, and conform to the standards in the Texas Legislative Council Drafting Manual, September 2020. The specific substantive changes are discussed in greater detail in this Section by Section Discussion in the corresponding portions related to the affected rule sections. Regarding the divisions of 30 TAC Chapter 115 that include adopted amendments, the commission additionally adopts the replacement of the term "Houston-Galveston" with the term "Houston-Galveston-Brazoria." The latter term reflects how the eight-county nonattainment area is commonly referenced in other parts of Chapter 115 by regulated entities and the commission. Other existing references to "Houston-Galveston" in parts of Chapter 115 that are not included in this adopted rulemaking may be addressed in a future rule project. For purposes of being consistent with other formatting styles of Chapter 115, the commission adopts the replacement of "/" with "-" in "Beaumont/Port Arthur," "Dallas/Fort Worth," and "Houston/Galveston," respectively. The commission additionally adopts the replacement of "nine months" in the proposed rule with "270 days" in the adopted rule in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month. These formatting updates are made in sections §§115.419, 115.459, 115.463, 115.469, 115.479, and 115.519 in this adopted rulemaking.

Subchapter A: Definitions

§115.10 Definitions

The commission adopts the change to the introductory paragraph of §115.10 to update a reference to the Texas Clean Air Act and make other non-substantive wording changes to be more precise and consistent.

The commission adopts a new definition for the Bexar County area in §115.10(3) to establish the affected area for the adopted Bexar County nonattainment rules. Former §115.10(3) and subsequent definitions are renumbered accordingly but are not otherwise revised, with the exception of the definitions for covered attainment counties currently in §115.10(10) and Dallas-Fort Worth (DFW) area currently in §115.10(11). For the definition of covered attainment counties, the commission adopts the insertion of "before January 1, 2025" immediately after "Bexar" to make it clear that Bexar County is subject to applicable covered attainment county rules before January 1, 2025, which is the compliance date for the adopted rules applicable in the Bexar County ozone nonattainment area to implement RACT. For the definition of DFW area, the commission adopts the removal of a definition of the DFW area currently in §115.10(11)(B)(iii) that excludes Wise County and applies to Flexographic and Rotogravure Printing in Subchapter E, Division 3. Removal of this definition is necessary to allow the rules in Subchapter E, Division 3 for flexographic and rotogravure printing to apply in Wise County. The clauses in subparagraph (B) of the definition are renumbered accordingly.

Subchapter B: General Volatile Organic Compound Sources

Division 1: Storage Of Volatile Organic Compounds

§115.110 Applicability and Definitions

To switch Bexar County's applicability under the volatile organic compounds (VOC) storage rules in Subchapter B, Division 1, the commission adopts new applicability requirements in §115.110(a)(2) to signify the Bexar County area's status as a nonattainment area for which VOC storage rules for nonattainment areas will apply. Bexar County is currently listed along with other attainment counties for which VOC storage rules for attainment counties apply. Subsequently listed areas are renumbered.

The commission appends "as defined for covered attainment counties in §115.10 of this title (relating to Definitions)" to the end of the current §115.110(a)(5) language and renumbers it as §115.110(a)(6) to specify that Bexar County will be removed from this attainment county applicability list on January 1, 2025 when the area is required to comply with the newly adopted nonattainment county storage tank rules.

§115.111 Exemptions

The commission adopts exemptions in §115.111(a) for the Bexar County ozone nonattainment area on the compliance date for the rules in Subchapter B, Division 1. The exemptions are for adopted nonattainment rules and not existing covered attainment county regulations. Specifically, the commission adopts the application of the existing exemptions in paragraphs (2), (4), (6), and (7) to affected sources in the Bexar County area. Upon the compliance date for the adopted rules in Division 1 that apply in Bexar County, the commission adopts the addition of the Bexar County area for the following exemptions: in paragraph (2), an exemption from Division 1 requirements for tanks with a capacity less than 210,000 gallons that store crude oil or condensate prior to custody transfer; in paragraph (4), an exemption from the requirement to retrofit with a rim-mounted secondary seal under specific circumstances for welded storage tanks with a mechanical shoe primary seal that have a shoe-mounted secondary seal; in paragraph (6), an exemption from any external floating roof secondary seal requirement under specific circumstances for welded storage tanks storing VOC with a true vapor pressure less than 4.0 pounds per square inch absolute (psia); and in paragraph (7), an exemption from any external floating roof secondary seal requirement under specific circumstances for welded storage tanks storing crude oil with a true vapor pressure equal to or greater than 4.0 psia and less than 6.0 psia.

The commission adopts revised §115.111(a)(10) to update regulatory references, remove a severe nonattainment reclassification scenario (since DFW has already been reclassified as severe nonattainment), and add a November 7, 2025 exemption expiration date when the DFW area must comply with severe nonattainment requirements and may no longer use this exemption.

The commission adopts a November 7, 2025 start date in place of "the date specified in §115.119(b)(1)(C)" to activate the §115.111(a)(11) DFW exemption to appropriately reflect its recent severe nonattainment redesignation and not the prior serious nonattainment compliance date. The commission adopts an update to the §115.111(a)(11) exemption requirement reference to the more appropriate §115.112(e)(4)(B) since prior §115.112(e)(4)(B)(ii) control requirement is also removed, as discussed elsewhere in this Section by Section Discussion.

The commission adopts an update to the §115.111(a)(12) exemption requirement reference from §115.112(e)(4)(C) to 115.112(e)(4)(C)(i).

The commission adopts a revision to existing §115.111(a)(13) to exempt Wise County condensate storage tanks and tank batteries with 12-month throughputs greater than 3,000 barrels (126,000 gallons) from §115.112(e)(4)(C)(ii) flash gas control requirements for the period July 20, 2021 until November 7, 2025 if the owner demonstrates the aggregate 12-month rolling storage tank VOC emissions are less the 50 tons per year (tpy).

The commission adopts new §115.111(a)(14) requirements that will exempt Wise County condensate storage tanks and tank batteries with 12-month throughputs greater than 1,500 barrels (63,000 gallons) from §115.112(e)(4)(D) flash gas control requirements, on and after November 7, 2025, if the owner demonstrates the aggregate 12-month rolling storage tank VOC emissions are less the 25 tpy.

The commission adopts new §115.111(a)(15) requirements that will exempt Bexar County condensate storage tanks and tank batteries with 12-month throughputs greater than 6,000 barrels (252,000 gallons) from §115.112(e)(4)(E) flash gas control requirements, on and after January 1, 2025, if the owner demonstrates the aggregate 12-month rolling storage tank VOC emissions are less the 100 tpy.

The commission adopts the revised exemption in former §115.111(a)(14), adopted to be renumbered as §115.111(a)(16), to add Bexar County tanks that store crude oil or condensate and that are also subject to Subchapter B, Division 7 compliance requirements. The commission adopts removal of the reference to the January 1, 2023 compliance date for the DFW and HGB areas to comply with Division 7 requirements and replace it with a reference to the initial compliance schedules for Division 7 rules provided in §115.183. This revision is adopted because the January 1, 2023 compliance date is only applicable in the DFW and HGB areas and not in the Bexar County area. Referring to the initial compliance dates in §115.183 provides an appropriate source for determining the status of this exemption by area.

The commission adopts revisions to existing §115.111(c) stating that the Bexar County exemptions in this subsection no longer apply after December 31, 2024 when affected Bexar County storage tanks are required to meet §115.111(a) provisions to qualify for an exemption.

§115.112 Control Requirements

The commission adopts added language to §115.112(c) to specify that Bexar County area storage tanks are only subject to these requirements through December 31, 2024. On and after January 1, 2025, affected Bexar County storage tanks must comply with adopted §115.112(e) RACT requirements instead of §115.112(c).

The commission adopts the addition of the Bexar County area in §115.112(e) so that Bexar County must comply with current DFW and HGB RACT requirements beginning on January 1, 2025. To clarify the applicability transition from subsection (e) requirements to those in Division 7 for crude oil and condensate storage tanks, the commission adopts the removal of the reference to the January 1, 2023 compliance date for Division 7 and replace it with a reference to the compliance schedule provisions for Division 7 in §115.183. This change is required because Bexar County sources have a later Division 7 compliance date than DFW and HGB.

The commission adopts new §115.112(e)(3)(A)(iv) for the Bexar County area to designate the same minimum RACT efficiency for control devices in the Bexar County area as the HGB and DFW nonattainment areas.

The commission adopts revisions in §115.112(e)(4)(B) and (C) and a new §115.112(e)(4)(D) to lower the throughput flow rate that triggers fixed roof condensate storage tank flash gas control requirements in the DFW area to 1,500 barrels (or 63,000 gallons) per year by November 7, 2025. This throughput is consistent with the severe nonattainment 25 ton major source threshold when using the default VOC content for condensate. Each monthly throughput for the 12 calendar months immediately before any date that a fixed roof condensate storage tank is potentially subject to flash gas control requirements shall be added together to derive the appropriate 12-month value for comparison with the throughput limit. To accomplish this, the provision in former §115.112(e)(4)(B)(i) that established the current 3,000 barrels flash gas control throughput limit for condensate storage tanks prior to custody transfer is consistent with the serious nonattainment 50-ton major source threshold and is moved under subparagraph (B) with an end date before November 7, 2025.

The before November 7, 2025 end date is also added to existing §115.112(e)(4)(C)(ii), which established the current 3,000 barrel limit for Wise County. The commission's adopted Wise County rules in §115.112(e)(4)(C)(ii) specify the last period where the current 3,000 barrel throughput limit will be applicable as the 12 whole calendar months immediately before November 7, 2025 (November 2024 through October 2025). The throughput data are adjusted to the start of the month because production and disposition data covering a calendar month are reported to the Railroad Commission of Texas.

Adopted §115.112(e)(4)(D) reduces the existing 3,000 barrel 12-month rolling average throughput limit requiring flash gas controls on fixed roof condensate storage tanks prior to custody transfer to 1,500 barrels in the entire DFW area beginning on November 7, 2025. To account for how data are reported, compliance with this limit is to be determined using throughput data beginning November 1, 2025.

The commission adopts additional adjustments to §115.112(e)(4)(B)(ii) and §115.112(e)(4)(C)(i). The provision in §115.112(e)(4)(B)(ii) is removed because the DFW area will not be reclassified to severe for the 1997 ozone standard, which has been revoked. The provision in §115.112(e)(4)(C)(i) is amended to specify the end date for the previous 6,000 barrel 12-month rolling average throughput limit for Wise County, which was July 20, 2021.

The commission adopts new §115.112(e)(4)(E) that requires compliance with flash gas emission vapor control system requirements beginning January 1, 2025 for Bexar County area fixed roof tanks with an annual throughput greater than 252,000 gallons that store condensate prior to custody transfer.

The commission adopts revisions in §115.112(e)(5) concerning the VOC emission control trigger levels for a fixed roof tank or tank batteries that store crude oil or condensate prior to custody transfer or at a pipeline breakout station to add a Bexar County trigger level and revises the DFW area trigger level beginning on November 7, 2025 to coincide with the 25-ton major source threshold for severe nonattainment areas.

The commission adopts consolidation of the existing emission trigger level for the DFW area except Wise County into §115.112(e)(5)(B) after moving the 50-ton limit in deleted clause (i) into (5)(B) and deleting clause (ii) which can no longer be applicable due to revocation of the 1997 NAAQS. The trigger in revised §115.112(e)(5)(B) lasts until November 7, 2025. The commission also adopts a November 7, 2025 end date for the same 50-ton limit in §115.112(e)(5)(C)(ii) and also specifies the end date for the previous 100-ton limit in Wise County, which was July 20, 2021.

The commission adopts new §115.112(e)(5)(D) to lower rolling 12-month uncontrolled VOC emission control trigger levels for a fixed roof tank or tank batteries that store crude oil or condensate prior to custody transfer or at a pipeline breakout station in the DFW area to 25 tons. This unifies the control requirements across the DFW area into one provision beginning November 7, 2025.

The commission adopts new §115.112(e)(5)(E) that requires a flash gas emission vapor control system for Bexar County area fixed roof tanks or tank batteries with uncontrolled annual emissions greater than or equal to 100 tpy at a pipeline breakout station or that store crude oil prior to custody transfer. The compliance date for these new Bexar County requirements is January 1, 2025, as specified in §115.183.

The commission adopts the addition of the Bexar County area to the existing §115.112(e)(7) DFW area and HGB area compliance provisions so that on and after January 1, 2025, affected Bexar County area fixed roof tanks that store condensate or crude oil prior to custody transfer must route vapors to a vapor recovery unit, in accordance with manufacturer instructions or industry standards consistent with good engineering practices.

§115.114 Inspection and Repair Requirements

The commission adopts revised §115.114(a) to apply the inspection requirements in that subsection to affected sources located in the Bexar County area. The compliance date for these new Bexar County requirements is January 1, 2025.

The commission adopts the addition of the Bexar County area to existing inspection requirements for fixed roof storage tanks subject to the requirements of §115.114(a)(5). Affected sources located in the Bexar County area are subject to these inspection and repair requirements starting January 1, 2025.

The commission adopts revised §115.114(c) to remove Bexar County area applicability for the storage tank inspection and repair obligations as a covered attainment county on January 1, 2025.

§115.115 Monitoring Requirements

The commission adopts the addition of the Bexar County area to the monitoring requirements in §115.115(a). The requirements apply in Bexar County beginning January 1, 2025.

§115.116 Testing Requirements

The commission adopts the addition of the Bexar County area to the current Beaumont-Port Arthur (BPA), DFW, El Paso, and HGB area VOC emission test requirements in §115.116(a). As specified in adopted §115.119(g), the requirements apply in Bexar County beginning January 1, 2025.

§115.117 Approved Test Methods

The commission adopts the addition of the Bexar County area to the list of areas for which the test methods in §115.117 apply.

§115.118 Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to the list of areas for which the recordkeeping requirements in §115.118 apply. The Bexar County area is also included with the areas for which additional records must be kept to comply with §115.118(a)(6). These adopted requirements apply in Bexar County beginning January 1, 2025. Finally, an adopted provision is added to §115.118(a)(7) to require maintenance of applicable records in Bexar County for at least five years, beginning January 1, 2025.

§115.119 Compliance Schedules

For sources subject to the requirements in Subchapter B, Division 1, the commission adopts a compliance schedule for Bexar County to transition from existing requirements that apply to Bexar County as a covered attainment county to RACT requirements that apply to the Bexar County 2015 ozone NAAQS nonattainment area. Likewise, the commission adopts a compliance schedule for the DFW area to transition from RACT requirements that establish a level of control for an ozone NAAQS nonattainment area classified as serious to a level of control required for a severe ozone NAAQS nonattainment area. The commission also adopts removal of §115.119(b)(1)(C) because the compliance requirements it references are also removed due to revocation of the 1997 ozone NAAQS.

The commission adopts revised §115.119(e) to clarify that Bexar County is no longer subject to the compliance schedule for storage tank requirements in attainment counties beginning January 1, 2025, at which time, the compliance schedule in new §115.119(g) applies. Adopted new §115.119(g) specifies a compliance date that is no later than January 1, 2025 for the new Bexar County nonattainment area storage tank requirements, and existing §115.119(g) and (h) are renumbered accordingly.

The commission adopts revised §115.119(f) to specify November 7, 2025 as the compliance date for storage tanks in Wise County. Existing compliance requirements continue, and new control requirements are included in adopted new §115.112(e)(4)(D) and (5)(D).

Division 2: Vent Gas Control

§115.121 Emission Specifications

The commission adopts revised §115.121(a) to specify that sources with affected vent gas streams located in the Bexar County area are subject to the existing emissions specifications of the subsection, which address VOC vent gas control RACT requirements. Owners or operators of affected vent gas streams located in the Bexar County 2015 ozone NAAQS nonattainment area must comply with the emission specifications in the subsection beginning January 1, 2025, the compliance date specified in adopted new §115.129(g).

The commission adopts revised §115.121(a)(3) to specify that bakeries with affected vent gas streams located in the Bexar County area will be subject to the existing control requirements under §115.122(a)(3).

The commission adopts revised §115.121(c) to clarify that the emission specifications for vent gas control applicable in attainment counties, which currently includes Bexar County, will no longer apply in Bexar County beginning January 1, 2025. Instead, the emissions specifications in subsection (a) apply to affected sources located in the Bexar County area beginning January 1, 2025.

§115.122 Control Requirements

The commission adopts revision of the vent gas control requirements in §115.122(a) to incorporate nonattainment area VOC RACT requirements for the Bexar County area as well as the DFW 2008 ozone NAAQS severe nonattainment area. The Bexar County area is added to the list of areas for which the control requirements in §115.122(a) apply to ensure that sources in the Bexar County area will become subject to RACT requirements for VOC from affected vent gas streams. The commission adopts changes to make Bexar County area bakeries with bakery oven vent gas streams affected by §115.121(a)(3) subject to the existing control requirements in §115.122(a)(3) so the Bexar County area is added to the list of areas for which §115.122(a)(3) applies.

The commission also adopts revised §115.122(a)(3) to address severe ozone classification requirements for the DFW 2008 ozone NAAQS nonattainment area. Existing §115.122(a)(3)(B) is amended to establish that the existing control requirements for affected bakery oven vent gas streams located in the DFW area, which were established to meet serious classification requirements, will continue to apply through November 6, 2025. Beginning November 7, 2025, each bakery oven with an affected vent gas stream located in the DFW 2008 ozone NAAQS severe nonattainment area must reduce uncontrolled VOC emissions by at least 80%. This change is necessary to address sources that become new major sources in the DFW area due to the change in major source threshold as a result of the reclassification from serious to severe nonattainment for ozone. On the compliance date for these adopted severe area RACT provisions, affected sources in the entire DFW 2008 ozone NAAQS nonattainment area, including Wise County, become subject to the adopted severe RACT requirements in §115.122(a)(3)(B).

Existing §115.122(a)(3)(C) is amended to clarify that the requirement to reduce uncontrolled VOC emissions by at least 30% from an affected bakery's 1990 emission inventory, for those sources located in the DFW area with uncontrolled VOC emissions equal to or greater than 25 tons per calendar year and less than 50 tons per calendar year, will no longer apply to those affected sources beginning November 7, 2025. This former requirement is less stringent than the adopted severe RACT requirements in §115.122(a)(3)(B).

The commission adopts a new subparagraph for Bexar County to establish a 100 tpy RACT uncontrolled bakery oven VOC emission rate trigger that requires Bexar County sources to reduce VOC emissions by a minimum of 80%. The adopted new subparagraph is added as §115.122(a)(3)(E), and the provision formerly in §115.122(a)(3)(E) is renumbered to subparagraph (F). Adopted new §115.122(a)(3)(E) establishes control requirements for affected vent gas streams from affected bakery ovens located in the Bexar County area similar to the control requirements for sources located in the HGB and DFW areas, provided in §115.122(a)(3)(A) and (B).

Adopted renumbered §115.122(a)(3)(F), clarifies that VOC emission reductions in the 30% to 90% range will continue to not be creditable for purposes of 30 TAC Chapter 101, Subchapter H, Division 1 for those bakeries located in the DFW area that have uncontrolled VOC emissions equal to or greater than 50 tons per calendar year through November 6, 2025, an emission control trigger transitions to 25 tons per calendar year beginning November 7, 2025. This adopted change addresses the reclassification from serious to severe ozone nonattainment for sources located in the DFW 2008 ozone NAAQS severe nonattainment area and the change in major source threshold from 50 to 25 tons per year of VOC.

Adopted renumbered §115.122(a)(3)(F) is also amended to add new clause (iv) to establish a 100 tpy VOC uncontrolled bakery oven emission control trigger for sources in the Bexar County area. This adopted change is necessary to address newly affected sources located in the Bexar County area and to specify that these sources will be subject to the same prohibition on creditable VOC emission reductions as those located in other ozone nonattainment areas.

The commission adopts revised §115.122(c) to stipulate that vent gas control requirements applicable in attainment counties will continue to apply in Bexar County through December 31, 2024. Beginning January 1, 2025, sources located in the Bexar County area with affected vent gas streams must comply with the requirements of §115.122(a).

§115.123 Alternate Control Requirements

The commission amends the nonattainment area alternate vent gas control VOC RACT requirements in §115.123(a) to include the Bexar County area. The commission also adopts amended §115.123(c) to specify that the alternate methods in that subsection no longer be available to persons in Bexar County beginning January 1, 2025, the date the provisions in existing §115.123(a) are applicable in the Bexar County 2015 ozone NAAQS nonattainment area. Though the alternate control requirements for vent gas streams for sources located in the Bexar County area under adopted revised §115.123(a) are similar to those in §115.123(c), the adopted change is necessary to transition the provisions applicable in Bexar County from those associated with ozone attainment counties to those required for ozone nonattainment areas.

§115.125 Testing Requirements

The commission adopts the addition of the Bexar County area in the existing flare performance test requirements in §115.125(3)(C) and the vapor combustor performance test requirements in §115.125(3)(D). These requirements will apply for sources in Bexar County beginning January 1, 2025.

§115.126 Monitoring and Recordkeeping Requirements

The commission adopts amended requirements in §115.126 to reflect Bexar County's transition from an attainment county to an ozone NAAQS nonattainment area. This includes removing Bexar County from the list of attainment counties subject to the requirements of the section and adding the Bexar County area to the list of nonattainment areas subject to the requirements of the section. Additionally, owners or operators of vapor control systems for affected sources located in the Bexar County area will be subject to the requirements in §115.126(1), including the existing requirements for continuous monitoring and recording under subparagraph (A) and the existing requirements for flares under subparagraph (B). Owners or operators of vapor control systems for affected sources located in the Bexar County area are required to comply beginning January 1, 2025.

§115.127 Exemptions

The commission adopts revised §115.127(a) to apply the exemptions in the subsection to the Bexar County ozone nonattainment. Section 115.127(c), which currently applies to persons in Bexar County, will be amended to apply only in Aransas, Calhoun, Matagorda, San Patricio, and Travis Counties. Persons located in Bexar County who own or operate the streams identified in §115.127(c) will no longer qualify for the exemptions listed in the subsection beginning January 1, 2025, the adopted compliance date for affected sources in the Bexar County ozone nonattainment area.

§115.129 Counties and Compliance Schedules

Existing §115.129(a) specifies that the compliance date for the attainment counties listed in the subsection, which includes Bexar County, has passed and that the owner or operator of an affected source must continue to comply with the existing provisions of Division 2. Subsection (a) is adopted and revised to include a reference to adopted new §115.129(g), which provides compliance dates for owners or operators of affected sources in the Bexar County 2015 ozone NAAQS nonattainment area, to clarify that owners or operators of affected sources in Bexar County are required to continue to demonstrate compliance with the applicable provisions for attainment counties of Subchapter B, Division 2 through December 31, 2024. To address RACT requirements that apply to newly affected sources in the Bexar County 2015 ozone NAAQS nonattainment area, owners or operators of affected sources are required to demonstrate compliance with all applicable requirements of Division 2 by no later than January 1, 2025.

The commission adopts the addition of Bexar County to the list of counties in existing §115.129(f) to specify that for an owner or operator of an affected vent gas stream that becomes subject to the vent gas control requirements on or after their compliance date specified in adopted new §115.129(g) for sources located in the Bexar County area, the owner or operator is required to comply with the requirements of the division as soon as practicable but no later than 60 days after becoming subject. Additionally, a new subsection is added to establish a January 1, 2025 compliance date in the Bexar County area for owners or operators of vent gas sources that will become subject to the requirements in Subchapter B, Division 2. The adopted compliance schedule specifies that affected entities in Bexar County must comply with existing Division 2 provisions applicable for attainment counties through December 31, 2024, and that by no later than January 1, 2025, affected entities must comply with all new adopted Division 2 provisions applicable in the Bexar County 2015 ozone NAAQS nonattainment area. The Bexar County area compliance date provision is adopted as §115.129(g), and the provision formerly in §115.129(g) is removed as obsolete since Wise County's nonattainment status has been resolved.

Division 3: Water Separation

§115.131 Emission Specifications

The commission adopts revised §115.131(a) to include the Bexar County area to apply RACT for VOC water separators to affected sources located in the Bexar County ozone nonattainment area. This adopted change will subject affected sources located in the area to the existing emission specifications of the subsection beginning January 1, 2025, which is the adopted compliance date for the Bexar County area specified in adopted new §115.139(e).

The commission adopts revised §115.131(c) to clarify that VOC water separation attainment county requirements under existing subsection (c) will remain in effect for sources in Bexar County through December 31, 2024. On January 1, 2025, the emission specifications provided for under subsection (a) will apply in the Bexar County 2015 ozone nonattainment area.

§115.132 Control Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to the control requirements in §115.132(a). This change is necessary to apply ozone nonattainment area RACT requirements for VOC water separators in the Bexar County 2015 ozone NAAQS nonattainment area.

Because owners or operators of affected sources are required to comply with the control techniques to satisfy RACT specified in §115.132(a)(1) - (4) by the compliance date specified in adopted new §115.139(e), the commission adopts added language to §115.132(c) to clarify that compliance with the control requirements of that subsection for attainment counties is no longer required for sources located in Bexar County beginning January 1, 2025. The commission adopts amendments to punctuation throughout the subsection. These adopted changes do not alter the meaning or intent of the existing rules in §115.132(c) and are adopted only to clarify meaning with appropriate sentence structure and punctuation.

§115.135 Testing Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to §115.135(a) to clarify that the Bexar County area will be subject to the existing testing requirements that currently exist for other ozone nonattainment areas under Subchapter B, Division 3. Affected sources located in the Bexar County area will become subject to the testing requirements of Division 3 beginning January 1, 2025, at which time, owners or operators of these sources will be required to begin using these methods and procedures.

§115.136 Monitoring and Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to §115.136(a) to clarify that sources in the Bexar County area will be subject to the VOC water separation monitoring and recordkeeping requirements that currently exist for other ozone nonattainment areas under Subchapter B, Division 3. Owners or operators of affected sources in the affected ozone nonattainment area must conduct the appropriate monitoring and develop and maintain the appropriate records beginning January 1, 2025, as specified in adopted new §115.139(e).

§115.137 Exemptions

The commission adopts the addition of the Bexar County area to the list of areas subject to §115.137(a). This adopted change applies the exemptions that currently exist for other ozone nonattainment areas covered by Subchapter B, Division 3 to affected sources located in the Bexar County 2015 ozone NAAQS nonattainment area. Owners or operators of affected sources in the nonattainment area will be able to claim the existing exemptions under subsection (a) for their affected sources beginning January 1, 2025. These exemptions are already available for affected sources located in other ozone nonattainment areas subject to Subchapter B, Division 3 requirements.

The commission adopts revised §115.137(c) to clarify that beginning January 1, 2025, the exemptions identified in that subsection, which are associated with attainment counties, no longer apply in Bexar County.

§115.139 Counties and Compliance Schedules

Existing §115.139(a) specifies that the compliance date for the attainment counties listed in the subsection, which includes Bexar County, has passed and that the owner or operator of an affected source must continue to comply with the existing provisions of Division 3. Subsection (a) is adopted with revisions to include a reference to adopted new §115.139(e), which provides compliance dates for owners or operators of affected sources in the Bexar County 2015 ozone NAAQS nonattainment area, to clarify that owners or operators of affected sources in Bexar County are required to continue to demonstrate compliance with the applicable provisions for attainment counties of Subchapter B, Division 3 through December 31, 2024. To address RACT requirements that apply to newly affected sources in the Bexar County 2015 ozone NAAQS nonattainment area, owners or operators of affected sources are required to demonstrate compliance with all applicable requirements of Division 3 by no later than January 1, 2025.

The commission adopts the addition of Bexar County to the list of counties specified in existing §115.139(d) to specify that for an owner or operator of an affected water separator in the Bexar County area who becomes subject to the water separation requirements on or after the compliance date specified in adopted new §115.139(e), the owner or operator is required to comply with the requirements of the division as soon as practicable but no later than 60 days after becoming subject. Additionally, new subsection (e) is adopted, establishing a January 1, 2025 compliance date in the Bexar County area for owners or operators of water separator sources subject to the requirements in Subchapter B, Division 3. The Bexar County area compliance date provision is adopted as new §115.139(e), and the provision formerly in §115.139(e) is removed as obsolete since Wise County's nonattainment status has been resolved. Adopted new §115.139(e) specifies that the owner or operator of each VOC water separator subject to Subchapter B, Division 3 in the Bexar County nonattainment area is required to comply with the requirements of existing §§115.131(c), 115.132(c), and 115.137(c) through December 31, 2024. Beginning January 1, 2025, owners or operators of affected VOC water separators are required to comply with all other applicable requirements of Division 3.

Division 4: Industrial Wastewater

§115.142 Control Requirements

The commission adopts amendments to §115.142 to add the Bexar County area to the list of areas subject to the industrial wastewater control requirements in the section. This adopted change requires an owner or operator of an affected source category in the Bexar County ozone nonattainment area to control VOCs pursuant to the methods and techniques specified in the section, to the performance levels specified in the section, or both, as applicable.

In §115.142(1)(D)(ii), the commission adopts the addition of the Bexar County area to the list of areas subject to the requirements in §115.142(1)(D)(ii)(I) and (II). This adopted change is necessary to specify that the Bexar County area will be subject to the existing VOC industrial wastewater system requirements for junction boxes and vented covers that currently exist for nonattainment areas. These control requirements will apply to sources located in the Bexar County area beginning January 1, 2025.

In existing §115.142(3), the commission adopts the inclusion of the Bexar County area. This adopted change is necessary to specify that the Bexar County area will become subject to the existing VOC industrial wastewater system requirements for biotreatment units that currently exist for the other ozone nonattainment areas. These control requirements will apply to sources located in the Bexar County area beginning January 1, 2025.

§115.144 Inspection and Monitoring Requirements

The commission adopts the addition of the Bexar County area in §115.144. This adopted change ensures that owners or operators of affected sources in the Bexar County area will follow the same inspection and monitoring requirements that apply for sources in other ozone nonattainment areas covered by the division to demonstrate compliance with VOC industrial wastewater RACT requirements. These inspection and monitoring requirements will apply to sources located in the Bexar County area beginning January 1, 2025.

Paragraph (4) is revised to add the Bexar County area to the list of areas subject to the compliance measurement and inspection requirements in §115.144(4) for industrial wastewater systems. This change is necessary to apply requirements related to RACT to newly affected sources located in the Bexar County area.

§115.146 Recordkeeping Requirements

The commission adopts revisions to §115.146 to add the Bexar County area. Beginning January 1, 2025, an owner or operator of an affected source located in the Bexar County area will be required to compile and maintain records demonstrating compliance with the applicable requirements of Subchapter B, Division 4. These requirements currently exist for other ozone nonattainment areas subject to Subchapter B, Division 4.

§115.147 Exemptions

The commission adopts revisions to §115.147 to provide operators in the Bexar County area with an option to claim an exemption from the control requirements that will otherwise be applicable to affected sources under industrial wastewater rule requirements. These exemptions are currently available for other ozone nonattainment areas under Subchapter B, Division 4 RACT rules. Owners or operators of affected sources located in the Bexar County area will be able to claim these same exemptions, if applicable, beginning January 1, 2025.

§115.149 Counties and Compliance Schedules

The commission adopts new §115.149(c) to establish a compliance date of January 1, 2025 for affected sources in the Bexar County area to comply with the applicable revised industrial wastewater rules in Subchapter B, Division 4.

Division 6: Batch Processes

§115.161 Applicability

The commission adopts the addition of the Bexar County area to the existing applicability provisions in §115.161(a). Affected vent gas streams at batch process operations in the Bexar County area will become subject to the applicable requirements of Subchapter B, Division 6 beginning January 1, 2025.

§115.162 Control Requirements

The commission adopts revised §115.162 to add the Bexar County area to the list of areas subject to the control requirements in the section to specify that affected sources located in the area will be subject to the existing VOC RACT control requirements for batch process operation. Beginning January 1, 2025, affected sources must comply with the requirements for process vents, aggregate streams within a process, and once-in-always-in criteria as applicable.

§115.164 Determination of Emissions and Flow Rates

The commission adopts revised §115.164 to specify that Bexar County area affected sources are required to comply with the determination and estimation methods of §115.164 for batch process operations. These requirements for affected sources in the Bexar County area will begin on January 1, 2025.

§115.165 Approved Test Methods and Testing Requirements

The commission adopts revised §115.165 to apply the specified test methods and testing requirements of the section to affected sources located in the Bexar County area. The same test methods and testing requirements to assess batch process rule compliance apply for other ozone nonattainment areas subject to Subchapter B, Division 6. For the Bexar County area, these requirements will apply beginning January 1, 2025.

§115.166 Monitoring and Recordkeeping Requirements

The commission adopts revised existing §115.166 to specify that affected sources located in the Bexar County area are required to monitor and keep records for at least five years at the affected source to demonstrate compliance with the applicable requirements of Subchapter B, Division 6. These monitoring and recordkeeping requirements already apply in other ozone nonattainment areas covered by the division for vapor control systems and process vents.

§115.167 Exemptions

The commission adopts the addition of a new §115.167(1)(C) to exempt Bexar County area batch process operations that have total VOC emissions, determined before control but after the last recovery device, of less than 100 tpy from all otherwise applicable batch process requirements of the division, except for §115.161(b) and §115.161(c). These exemptions already apply in the BPA ozone maintenance area and the HGB ozone nonattainment area, and these exemptions will apply to affected sources located in the Bexar County area with the VOC emissions threshold beginning on January 1, 2025.

§115.169 Counties and Compliance Schedules

The commission adopts a new §115.169(d) that establishes a compliance date of January 1, 2025 for affected Bexar County area batch process operations that become newly subject to the requirements of Subchapter B, Division 6.

Division 7: Oil And Natural Gas Service In Ozone Nonattainment Areas

§115.170 Applicability

The commission adopts the addition of the Bexar County area to the applicability section of existing §115.170 of Subchapter B, Division 7. This adopted change makes existing applicable equipment in the Bexar County ozone nonattainment area subject to existing RACT requirements for sources covered by EPA's 2016 oil and gas CTG. Newly affected sources in the Bexar County area will be subject to the existing control requirements in the division beginning January 1, 2025.

§115.171 Definitions

The commission adopts a revised definition for heavy liquid service in §115.171(6) to match the criteria for heavy liquid in §115.10, which establishes a maximum combined VOC true vapor pressure limit of 0.044 pounds per square inch absolute (psia). This revision allows for consistency between the definitions in §115.10 and §115.171(6) and exemption provisions adopted in new §115.172(a)(9). The commission adopts a new definition in §115.171(17) to clarify the meaning of "wellhead" in alignment with EPA's 2016 oil and gas CTG.

The commission adopts a revised definition for intermittent bleed pneumatic controller in §115.171(9)(B) to exempt these controllers from existing bleed rate emission standards in §115.174(b)(2). This exemption aligns with EPA's 2016 oil and gas CTG and provides clarity to regulated entities to distinguish intermittent bleed from continuous bleed pneumatic controllers.

§115.172 Exemptions

The commission adopts new §115.172(a)(9)(A) - (D) to add an instrument monitoring exemption for heavy liquid service components for affected equipment in the areas listed in adopted §115.170. EPA's 2016 oil and gas CTG recommended including a heavy liquids service exemption, but this exemption was inadvertently excluded from the 2021 rulemaking to establish rules to implement the CTG (Rule Project No. 2020-038-115-AI).

The commission adopts an update to the proposed §115.172(a)(10) monitoring exemption for pressure relief devices. The revision more precisely aligns with EPA's 2016 oil and gas CTG guidance and exempts relief valves, which are routed through a closed vent system to a control device, process, or fuel gas system from the instrument monitoring requirements in §115.177(b) if an owner or operator conducts OVA inspections of affected components according to the inspection schedules and procedures in §115.177(b) and complies with either §115.172(a)(10) subparagraphs (A), (C) and (D) or subparagraph (B) repair protocol requirements. This is a change from proposal, where the owners or operators were required to comply with §115.172(a)(10) subparagraphs (A), (B), (C) and (D). The revised wording harmonizes the rule with the EPA's CTG document, whereas the proposal wording did not match the CTG and was logically inconsistent.

The commission adopts new §115.172(e) to add an exemption from §115.177(b) instrument monitoring requirements for well sites that only contain one or more wellheads and no other additional equipment. The 2016 oil and gas CTG recommended including a fugitive monitoring exemption for these limited well sites, but this exemption was inadvertently excluded from the 2021 rulemaking that added Chapter 115, Subchapter B, Division 7 requirements (Rule Project No. 2020-038-115-AI).

The commission adopts new §115.172(f) to exempt pressure relief valves that are vented to a process or to a fuel gas system, and those that are equipped with a closed vent system routed to a control device that meets the requirements of §115.175(a)(2) and (4) of Subchapter B, Division 7, from the monitoring requirements of §115.177(b). This exemption aligns with EPA's 2016 oil and gas CTG. Addition of this new exemption is adopted to correct an error of omission in Rule Project No. 2020-038-115-AI. For closed vent systems to qualify under this adopted new subsection (f), the closed vent system must be monitored according to the requirements of §115.177.

§115.173 Compressor Control Requirements

The commission repeals former §115.173 and simultaneously adopts new §115.173 to separate centrifugal and reciprocating compressor control requirements that were recommended in EPA's 2016 oil and gas CTG. The purpose of this adopted change is to organize the requirements in a format that makes them easier to identify and less likely to be misinterpreted. The commission adopts the reformat of this rule for clarification and correction purposes and is not adopting any changes to the existing requirements that are not recommended by the CTG. All existing control requirements specific to centrifugal compressors are adopted as new §115.173(a)(1) - (2). All existing control requirements specific to reciprocating compressor control requirements are adopted as new §115.173(b)(1) - (3). The reformatted compressor control device options and requirements are adopted as new §115.173(c)(1) - (5).

As noted in the preceding §115.170 applicability discussion, affected sources in the Bexar County area will become subject to the compressor control requirements beginning January 1, 2025. With the exception of the phrase "or rod packing" the provisions from former §115.173(1) are adopted as new §115.173(a)(1). The provisions from former §115.173(2) are adopted as new §115.173(a)(2).

The provisions from former §115.173(3)(A) are adopted as new §115.173(c). The provisions from current §115.173(3)(A)(i) are adopted as new §115.173(c)(1). The provisions from former §115.173(3)(A)(ii) are adopted as new §115.173(c)(2). The provisions from current §115.173(3)(B) are adopted as new §115.173(c)(3). The provisions from former §115.173(3)(C) are adopted as new §115.173(c)(4).

The provisions from former §115.173(3)(D) are adopted as new §115.173(b)(1). The provisions of former §115.173(3)(E) are adopted as new §115.173(b)(2). The commission adopts a new paragraph (3) in adopted new subsection (b) to specify that owners or operators of reciprocating compressors must route VOC gases, vapors, and fumes from the equipment through a closed vent system under negative pressure at the inlet for vapors to a control device that meets the requirements of adopted new subsection (c), if the owner or operator elects to use this method as opposed to replacing the rod packing. This option is not new and was already provided for reciprocating compressors in former §115.173(3) and is also in-line with the previous requirements for routing VOC emissions to a control device or to a process under former §115.173(1).

The provisions from former §115.173(4) are adopted as new §115.173(c)(5). The provisions from former §115.173(4)(A) are adopted as new §115.173(c)(5)(A). The provisions from former §115.173(4)(B) are adopted as new §115.173(c)(5)(B).

With these adopted changes, the commission is clarifying that for both centrifugal and reciprocating compressors subject to the requirements of Subchapter B, Division 7, control of VOC emissions must employ the use of a closed vent system that is designed and operated to route all gases, vapors, and fumes from the applicable equipment to the control device under normal operation and further operated under negative pressure at the inlet for all gases, vapors, and fumes.

§115.177 Fugitive Emission Component Requirements

The commission adopts revised §115.177(b)(7) to allow a valve subject to Subchapter B, Division 7 EPA Method 21 initial fugitive emission monitoring requirements and found not leaking during the most recent two successive monitoring surveys to be subsequently monitored on a quarterly rather than monthly basis beginning with the first month of the next calendar quarter after no leak was detected for two successive monitoring surveys. However, if the same valve were found to be leaking after initiation of monitoring on a quarterly basis, the component will have to return to its original monthly monitoring schedule and will be required to stay on this schedule until it was determined to not be leaking again for two successive months using EPA Method 21. This establishes a pathway for a less frequent monitoring schedule based on good performance. This pathway was recommended in EPA's 2016 oil and gas CTG and was intended to be included in the rules for this section adopted June 30, 2021 (Rule Project No. 2020-038-115-AI); however, the provision was inadvertently excluded from that rulemaking.

The commission adopts revised §115.177(b)(7) to codify an owner's or operator's option to satisfy the 2-year monitoring data requirement of the skip period request with valid historical monitoring data in accordance with the original rule's intent. It would be wasteful and unduly burdensome on regulated entities to disregard up to two years of valid data and require an additional two years of monitoring data when sufficient valid data is already available. This rulemaking also includes §115.177(b)(7) updates to clarify that EPA Method 21 must be used to qualify for a less frequent monitoring schedule in existing subparagraphs (A) and (B), aligning them with recommendations in EPA's 2016 oil and gas CTG.

§115.183 Compliance Schedules

The compliance schedule provisions in §115.183 were originally adopted without reference to applicable areas because only the DFW and HGB areas were subject to the rules in Division 7. Affected entities in both areas were required to comply by no later than January 1, 2023. With the adopted addition of the Bexar County area as subject to Subchapter B, Division 7 requirements, the compliance provisions must differentiate between the existing compliance schedules for the DFW and HGB areas and the adopted compliance schedule for the Bexar County area. The commission adopts amended subsections (a), (b), (d), and (e) to specify that these provisions apply in only the DFW and HGB areas. The compliance schedule for the Bexar County area is added as new subsection (g) to specify that affected Bexar County area equipment is required to comply with Subchapter B, Division 7 requirements no later than January 1, 2025.

No changes are adopted in subsections (c) and (f) because the existing compliance provisions, as written, apply to affected sources located in the Bexar County area. An owner or operator who becomes subject to the requirements of the division on or after the date specified for adopted new subsection (g) is required to comply with the requirements of Division 7 no later than 60 days after becoming subject. Demonstration of compliance with the recordkeeping required under existing §115.180(8) is required no later than 30 days after compliance with Division 7 is achieved. Finally, upon the date an owner or operator could no longer claim the exceptions in existing §115.174(e), the owner or operator is required to comply with the appropriate control requirement within 60 days.

Subchapter C: Volatile Organic Compound Transfer Operations

Division 1: Loading And Unloading Of Volatile Organic Compounds

§115.211 Emission Specifications

The commission adopts the addition of the Bexar County area to the list of areas subject to the emissions specifications in §115.211. The commission also adopts the addition of the Bexar County area to the list of areas subject to §115.211(1) requirements specifying a 0.09 pounds VOC per 1,000 gallons of gasoline loaded into transport vessel emission specification, which represents current RACT.

The commission adopts the addition of language to §115.211(2) referencing the definition of covered attainment counties in §115.10. This adopted addition indicates that Bexar County is not subject to the 0.17 pounds per 1,000 gallons of gasoline loaded emission specification once it is no longer defined as an attainment county, after December 31, 2024. At that time, beginning January 1, 2025, the more stringent 0.09 pounds per 1,000 gallons emission specification for the Bexar County 2015 ozone NAAQS nonattainment area is required.

§115.212 Control Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to §115.212 loading and unloading control requirements.

The commission adopts the addition of language to §115.212(b)(1) referencing the definition of covered attainment counties in §115.10to indicate that less stringent control requirements are no longer applicable in Bexar County beginning January 1, 2025. At that time, the new, more stringent control requirements in subsection (a) apply in the Bexar County 2015 ozone NAAQS nonattainment area.

§115.213 Alternate Control Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to existing §115.213(b) requirements.

Owners and operators of loading operations in the Beaumont-Port Arthur, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria ozone nonattainment areas have complied with these minimum 90% overall efficient VOC loading alternative control requirements for many years. This supports the commission's determination that the minimum 90% overall efficient alternate control requirement is presumed to represent current RACT for affected Bexar County area VOC loading sources.

The commission adopts revised §115.213(c) to end the overall control option for Bexar County on January 1, 2025 when sources in the county transition from compliance with §115.212(b)(1) to §115.212(a)(1).

§115.214 Inspection Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to existing §115.214(a) inspection requirements. Additionally, the commission adopts the addition of language to §115.214(b) and §115.214(b)(1) referencing the definition of covered attainment counties in §115.10. These adopted additions indicate that once Bexar County is no longer defined as an attainment county, after December 31, 2024, it is no longer subject to the inspection requirements in subsection (b). At that time, beginning January 1, 2025, the inspection requirements in subsection (a) apply in the Bexar County 2015 ozone NAAQS nonattainment area.

The commission adopts revised §115.214(b)(1) to state that the inspection requirements no longer apply in Bexar County beginning January 1, 2025.

§115.216 Monitoring and Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to existing §115.216 monitoring and recordkeeping requirements. Bexar County is subject to this section as an attainment county, but it will no longer be defined as an attainment county after December 31, 2024.

§115.217 Exemptions

The commission adopts revisions to §115.217(a) exemptions to provide operators in the Bexar County area with an option to claim that exemption. Additionally, the commission adopts the addition of language to §115.217(b) referencing the definition of covered attainment counties in §115.10. This adopted addition indicates that once Bexar County is no longer defined as an attainment county, after December 31, 2024, exemptions in subsection (b) no longer apply. At that time, beginning January 1, 2025, the exemptions in subsection (a) apply in the Bexar County 2015 ozone NAAQS nonattainment area.

The commission also adopts revised §115.217(b)(1) to clarify that Bexar County is no longer included in the exception from the covered attainment county exemption beginning January 1, 2025.

§115.219 Counties and Compliance Schedules

The commission adopts renumbering former §115.219(f) as new §115.219(g) with adopted language revisions and adopts new §115.219(f) that specifies affected sources in the Bexar County area must be in compliance with adopted Subchapter C, Division 1 VOC transfer operations, transport vessel and marine transfer equipment requirements no later than January 1, 2025. The adopted §115.219 revisions maintain the Bexar County compliance schedule for currently affected sources until January 1, 2025, when affected Bexar County sources must comply with the new adopted §115.219(f) provisions.

The commission adopts replacement of former §115.219(g), which is no longer a potential scenario, with a compliance schedule for sources that become subject to VOC loading and unloading provisions on or after the designated Subchapter C, Division 1 compliance date. Adopted new §115.219(g) provides a maximum 60 days for affected sources, which become subject to Subchapter C, Division 1 on or after their appropriate §115.219 compliance date, to comply with these VOC transfer operation requirements.

Division 2: Filling Of Gasoline Storage Vessels (Stage I) For Motor Vehicle Fuel Dispensing Facilities

§115.221 Emission Specifications

The commission adopts the addition of the Bexar County area to the list of areas subject to Stage I Motor Vehicle Fuel Dispensing Facilities RACT specifications in §115.221.

§115.222 Control Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to VOC control requirements during gasoline transfer specified in §115.222(5). These control requirements already apply to existing affected sources located in other ozone nonattainment areas covered by Subchapter C, Division 2.

The commission also adopts the addition of the Bexar County area to the list of areas subject to the VOC control requirements for storage tanks in §115.222(9). Additionally, the commission adopts added language to §115.222(10) indicating that the requirements in that paragraph, which applies in attainment counties, will no longer apply in Bexar County after December 31, 2024. This adopted addition indicates that once Bexar County is no longer defined as an attainment county, it is no longer subject to the control requirements in paragraph (10) for attainment counties.

§115.224 Inspection Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to the inspection requirements in §115.224. This amendment ensures the area will remain subject to the Stage I inspection requirements after Bexar County ceases to be defined as a covered attainment county.

§115.226 Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to the list of areas subject to the recordkeeping requirements in §115.226. This amendment ensures the area will remain subject to the Stage I recordkeeping requirements after Bexar County ceases to be defined as a covered attainment county.

§115.227 Exemptions

The commission adopts the addition of the Bexar County area to the listed areas to which §115.227(1) applies. This provides Bexar County owners and operators with an option to claim exemptions from Stage I nonattainment rules, which are already available in the Beaumont-Port Arthur, Dallas-Fort Worth, El Paso and Houston-Galveston-Brazoria nonattainment areas.

The commission adopts amended §115.227(3) and (4) to clarify that affected owners and operators in Bexar County area have the option to claim the current exemption until they must comply with Stage I RACT rules on January 1, 2025.

§115.229 Counties and Compliance Schedules

The commission adopts the addition of language to existing §115.229(c) to specify that Bexar County is no longer subject to the attainment county compliance schedule in the subsection beginning January 1, 2025, the date by which affected sources in the Bexar County 2015 ozone NAAQS nonattainment area must instead comply with the nonattainment area RACT requirements in Division 2.

The commission adopts removal of former §115.229(f) that contains obsolete language (since Wise County's nonattainment status has been resolved) and insertion of new §115.229(f) language with a deadline no later than January 1, 2025 for affected sources in the Bexar County area to comply with the adopted Stage I moderate nonattainment rule requirements.

Division 3: Control Of Volatile Organic Compound Leaks From Transport Vessels

§115.234 Inspection Requirements

The commission adopts the addition of the Bexar County area to the listed areas subject to §115.234(a). This implements RACT and makes affected sources in the Bexar County area subject to existing transport vessel VOC leak inspection requirements currently applicable in the BPA, DFW, El Paso, and HGB areas.

§115.235 Approved Test Methods

The commission adopts the addition of the Bexar County area to the list of areas subject to testing requirements in §115.235(a) to mandate test methods required by that subsection when conducting annual vapor-tightness tests on affected Bexar County area transport vessels. Additionally, the commission adopts added language to §115.235(b),indicating that the requirements in that paragraph, which apply in attainment counties, will no longer apply in Bexar County after December 31, 2024.

The test methods are the same for §115.235(a) and (b) so affected sources will be able to use the same test methods under each subsection.

§115.237 Exemptions

The commission adopts revisions to §115.237(a) to provide the opportunity for affected Bexar County area sources to claim the same transport vessel leak inspection exemptions provided in this subsection. Additionally, the commission adopts added language to §115.237(b), indicating that the requirements in that paragraph, which apply in attainment counties, will no longer apply in Bexar County after December 31, 2024.

§115.239 Counties and Compliance Schedules

The commission adopts new §115.239(e) to establish January 1, 2025 as the date by which owners and operators of transport vessels in the Bexar County area must comply with adopted Subchapter C, Division 3 rules. Deletion of former §115.239(e) is adopted because the status of Wise County nonattainment classification has been decided.

Subchapter D: Petroleum Refining, Natural Gas Processing And Petrochemical Processes

Division 1: Process Unit Turnaround And Vacuum-Producing Systems In Petroleum Refineries

§115.311 Emission Specifications

The commission adopts the addition of the Bexar County area to §115.311(a) VOC RACT emission specifications for process unit turnaround and vacuum-producing systems.

§115.312 Control Requirements

The commission adopts the addition of the Bexar County area to §115.312(a) VOC RACT emission control requirements for process unit turnaround and vacuum-producing systems. These same control requirements to satisfy RACT also apply for affected sources located in other ozone nonattainment areas currently covered by Subchapter D, Division 1. The commission also adopts the addition of a reference to §115.10, relating to Definitions, for the listed areas subject to subsection (a).

§115.315 Testing Requirements

The commission adopts the addition of the Bexar County area to existing §115.315(a) testing requirements. These same testing requirements apply for affected sources located in other ozone nonattainment areas currently covered under Subchapter D, Division 1.

§115.316 Monitoring and Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to existing §115.316(a) monitoring and recordkeeping requirements. Beginning January 1, 2025, the adopted compliance date for the Bexar County ozone nonattainment area as specified in adopted new §115.139(c), owners or operators of affected sources in the area must conduct the appropriate monitoring and develop and maintain sufficient records to demonstrate compliance with all applicable requirements of Subchapter D, Division 1.

§115.319 Counties and Compliance Schedules

The commission adopts new §115.319(c) to establish a compliance schedule for affected entities in the Bexar County 2015 ozone NAAQS nonattainment area. Compliance with the adopted Subchapter D, Division 1 rules is required for affected Bexar County sources by no later than January 1, 2025.

Division 3: Fugitive Emission Control In Petroleum Refining, Natural Gas/Gasoline Processing, And Petrochemical Processes On Ozone Nonattainment Areas

§115.352 Control Requirements

The commission adopts the addition of the Bexar County area to §115.352 VOC RACT control requirements for fugitive emissions.

§115.353 Alternate Control Requirements

The commission adopts the addition of the Bexar County area to existing §115.353(a) nonattainment area alternate control requirements.

§115.354 Monitoring and Inspection Requirements

The commission adopts the addition of the Bexar County area to existing §115.354 VOC RACT monitoring and inspection provisions.

§115.355 Approved Test Methods

The commission adopts the addition of the Bexar County area to existing §115.355 petroleum refining, natural gas/gasoline processing and petrochemical processes approved test methods in determining compliance with Subchapter D, Division 3 provisions.

§115.356 Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to existing in §115.356 petroleum refining, natural gas/gasoline processing and petrochemical processes recordkeeping requirements.

§115.357 Exemptions

The commission adopts the addition of the Bexar County area to existing §115.357 exemptions for petroleum refining, natural gas/gasoline processing, and petrochemical process sources that are able to meet specified conditions.

The commission adopts revised §115.357(15) to extend this exemption to Bexar County sources and ensure that affected sources that comply with one division of Chapter 115 regulations will not be required to comply with duplicative requirements from other Chapter 115 divisions. The paragraph references the Subchapter B, Division 7 compliance schedules in §115.183 and the revisions remove the former reference to the January 1, 2023 compliance date for the Subchapter B, Division 7 rules adopted in 2021 (2020-038-115-AI). The commission additionally adopts the addition of language indicating an affected operation must be subject to and must comply with the requirements in Subchapter B, Division 7 to be exempt from the requirements in Subchapter D, Division 3.

§115.359 Counties and Compliance Schedules

The commission adopts a new subsection §115.359(e) establishing a compliance schedule for affected sources in the Bexar County area. Under new subsection §115.359(e), Bexar County sources subject to adopted Subchapter D, Division 3 requirements must comply no later than January 1, 2025. By adding Bexar County to §115.359(d), sources newly subject after January 1, 2025 will have 60 days to come into compliance. Additionally, the commission adopts removal of former §115.359(e) because Wise County's nonattainment status has been resolved.

Subchapter E: Solvent Using Processes

Division 1: Degreasing Processes

Contingency Measure: Degreasing VOC Limit

The commission adopts amended Subchapter E, Division 1 to establish a new limit for VOC-containing solvent for cold solvent degreasing processes, open-top vapor degreasing processes, and conveyorized degreasing processes. The adopted limit will be implemented in the DFW and/or HGB 2008 ozone NAAQS nonattainment areas when triggered for SIP contingency purposes.

§115.410 Applicability and Definitions

New language is adopted and added to the applicability requirements in §115.410(a) to indicate that the contingency requirements in Division 1 will not apply until the commission publishes notice in the Texas Register that the contingency measure is triggered and subsequently applies for affected sources located in the DFW area, the HGB area, or both the DFW and HGB areas. The existing control requirements of §115.412(b) will be triggered for and apply to affected sources in the DFW ozone nonattainment area upon publication in the Texas Register by the commission as provided in adopted renumbered §115.419(f). The existing control requirements of §115.412(c) will be triggered for and apply to affected sources in the HGB ozone nonattainment area upon publication in the Texas Register by the commission as provided in adopted new §115.419(g).

The change to remove Bexar County from the list of individual counties and add the Bexar County area to the list of nonattainment areas is adopted by the commission. This change is necessary to include the Bexar County area in the list of current nonattainment areas for ozone subject to the requirements of Subchapter E, Division 1 due to the area's designation under the 2015 ozone NAAQS.

§115.411 Exemptions

The commission adopts a new subsection (b) to §115.411, to move existing rule requirements of §115.411 under an adopted new §115.411(a). This change is adopted to distinguish between the existing requirements of the section and the adopted new requirements under adopted new subsection (b) of §115.411. The existing rule requirements of §115.411 that are moved to adopted new subsection (a) are also revised to add the Bexar County ozone nonattainment area to the list of ozone nonattainment areas currently covered under Subchapter E, Division 1. This change is necessary due to the area's designation of nonattainment under the 2015 ozone NAAQS. Further, Bexar County is removed from the list of individual covered attainment counties in the existing provisions of §115.411, now adopted as new §115.411(a). The existing exemptions under §115.411, now adopted as new §115.411(a), for Bexar County as a covered attainment county will continue to apply in the Bexar County 2015 ozone NAAQS nonattainment area.

The existing rules in subsection (a) are also revised to indicate that the exemptions in that subsection will no longer be available for affected sources and operations subject to the requirements of §115.412(b) in the DFW area, of §115.412(c) in the HGB area, or of both §115.412(b) and (c) in the DFW and HGB areas, respectively, upon the compliance schedules for contingency measures specified in adopted renumbered §115.419(f), for the DFW area, or in adopted new §115.419(g), for the HGB area.

Under adopted new subsection (a)(1), the former reference to §115.412(1)(B) is adopted as §115.412(a)(1)(B). Similarly, in adopted new subsection (a)(2), the former reference to §115.412(1)(E) is adopted as §115.412(a)(1)(E). Under adopted new §115.411(a)(3), the former reference to §115.412(3)(A) is adopted as §115.412(a)(3)(A). Finally, the former reference to §115.412(1) is adopted as §115.412(a)(1) in adopted new §115.411(a)(4). See the discussion for §115.412 for similar restructuring of existing rule provisions.

Adopted new subsection (b) adds exemptions that will apply under a triggered SIP contingency requirement. If triggered, these will apply instead of the exemptions under former §115.411, now adopted as new §115.411(a), in the DFW, the HGB, or both the DFW and HGB 2008 ozone NAAQS nonattainment areas. The exemptions adopted in new §115.411(b)(1) - (3) are consistent with the existing exemptions in former §115.411(1) - (2) and (4), now adopted as new §115.411(a)(1) - (2) and (4), with the exception that, as of the compliance date in adopted renumbered §115.419(f) or in adopted new §115.419(g), or both, operations will be required to use a solvent with a VOC content of 25 grams per liter (g/l) or less. Additional minor formatting and reference revisions are adopted to align the adopted rules with the revised structure of the section.

§115.412 Control Requirements

The commission adopts new subsections (b) and (c) in §115.412, and moves rule requirements of former §115.412(a) under adopted new §115.412(a). This change is adopted to distinguish between the former requirements of the section and the adopted new contingency measures requirements under subsections (b) and (c) of §115.412. The rule requirements of §115.412 that are moved to adopted new subsection (a) are also revised to add the Bexar County ozone nonattainment area to the list of ozone nonattainment areas currently covered under Subchapter E, Division 1. This change is necessary due to the area's designation of nonattainment under the 2015 ozone NAAQS. Further, Bexar County is removed from the list of individual covered attainment counties in former §115.412, now adopted as new §115.412(a). The control requirements under former §115.412, now adopted as new §115.412(a), for Bexar County as a covered attainment county continue to apply in the Bexar County area until December 31, 2024. Newly affected sources located in the Bexar County ozone nonattainment area will be required to demonstrate compliance with the control requirements of this section beginning January 1, 2025.

Adopted new subsection (b) establishes a VOC content limit of 25 g/l for solvent used in cold solvent cleaning, open-top vapor degreasing, and conveyorized degreasing for operations in the DFW area according to the compliance schedule in adopted renumbered §115.419(f). Adopted new subsection (c) establishes the same requirements for contingency purposes in the HGB area according to the compliance schedule in adopted new §115.419(g). The new control requirements adopted under subsections (b) and (c), respectively, will apply in addition to existing control measures in §115.412, now adopted as §115.412(a), if triggered for contingency purposes. Additional minor formatting and reference revisions are adopted to align the adopted rules with the existing structure of the section and to make non-substantive formatting corrections.

§115.413 Alternate Control Requirements

The commission adopts a new exception to the existing alternate control requirements in §115.413 to allow for new alternate control requirements to apply in the DFW area and/or HGB area if the contingency measure for degreasing operations under Subchapter E, Division 1, is triggered. Additionally, the Bexar County ozone nonattainment area is added to the list of ozone nonattainment areas currently covered under Subchapter E, Division 1. Further, Bexar County is also removed from the list of individual covered attainment counties in existing §115.413. These alternate control requirements for owners or operators of affected sources located in the Bexar County ozone nonattainment area will take effect beginning January 1, 2025. Since only the DFW and/or HGB areas will be subject to the adopted new alternate control requirement provisions in adopted new paragraph (4), adopted language is added to §115.413 excepting paragraph (4) from applicability to all the areas subject to the section.

Pursuant to changes for the restructuring of existing rule provisions under §115.412, the commission adopts revised references to former §115.412(1) to new §115.412(a)(1) under existing paragraph (2) of §115.413. The former references to §115.412(2)(D) and §115.412(3)(A) in paragraph (3) of §115.413 are adopted as new §115.412(a)(2)(D) and (a)(3)(A), respectively.

To address SIP contingency control-related requirements under new subsections (b) and (c) of §115.412, the commission adopts a new paragraph (4) under §115.413 to specify alternate control requirements applicable in the DFW area, the HGB area, or both the DFW and HGB areas if one or both of the areas becomes subject to the control requirements in adopted new §115.412(b) and/or (c), respectively. The adopted alternate contingency control requirements will allow the use of an airless/air-tight or other alternate cleaning system approved by EPA under specified conditions if it achieves equivalent emissions reductions and is approved by the executive director of the commission.

Conditions for use of the alternate method are added under adopted new §115.413(4)(A) - (E) and relate to equipment operation, waste storage, spill cleanup, and equipment maintenance. Additional minor formatting and reference revisions are adopted to align the adopted rules with the existing structure of the section.

§115.415 Testing Requirements

To address the Bexar County area's designation as nonattainment for ozone under the 2015 ozone NAAQS, the commission adopts the inclusion of the Bexar County area in the list of ozone nonattainment areas currently subject to Subchapter E, Division 1. This change is necessary to subject affected sources located in the Bexar County area to the existing testing requirements of §115.415 for owners or operators to demonstrate compliance with the RACT requirements of the division. Bexar County is removed from the list of current attainment counties in the introductory paragraph of §115.415. There is no change to testing requirements for owners or operators of affected sources located in the Bexar County ozone nonattainment area.

The former reference to §115.412(1) in paragraph (1) of the section is revised to §115.412(a)(1). The former references to §115.412(2)(D)(iv) and (3)(A)(ii) are also revised to new §115.412(a)(2)(D)(iv) and (a)(3)(A)(ii), respectively, in paragraph (2) of §115.415. These changes are adopted to align with the restructuring of other rule sections under Subchapter E, Division 1.

New testing provisions are adopted to establish VOC-content testing requirements to demonstrate compliance with the SIP contingency control requirements adopted in new §115.412(b) and (c). The adopted new test methods are EPA's Method 24 or alternative procedures described in 40 Code of Federal Regulations (CFR) §60.446. The adopted new test methods are added as §115.415(3), and existing paragraph (3) is renumbered to paragraph (4). Owners or operators of affected sources located in the DFW area, the HGB area, or both the DFW and HGB areas will be required to comply with these new testing requirements to verify compliance with new contingency measures, if triggered.

§115.416 Recordkeeping Requirements

To ensure compliance with the RACT requirements of Subchapter E, Division 1 for affected sources located in the Bexar County ozone nonattainment area, the commission adopts the inclusion of the Bexar County area in the list of ozone nonattainment areas currently covered under Subchapter E, Division 1 recordkeeping requirements. Bexar County is removed from the current list of covered attainment counties concerning recordkeeping requirements for those attainment counties. Owners or operators of affected sources located in the Bexar County ozone nonattainment area are required to demonstrate compliance the recordkeeping requirements of the section beginning January 1, 2025.

In paragraph (2), the commission adds a reference to adopted new paragraph (3) of §115.415. The former reference to §115.411(5) in paragraph (3) of the section is adopted as §115.411(a)(5).

§115.419 Counties and Compliance Schedules

Bexar County is currently subject to Subchapter E, Division 1 requirements as an attainment county. The existing requirements for Bexar County as a covered attainment county will continue to apply in the Bexar County area until December 31, 2024. The commission adopts administrative changes to the compliance schedules in §115.419 to address Bexar County's change in status from a covered attainment county to an ozone nonattainment area. The existing reference to Bexar County in §115.419(b) is removed to clarify that the area is no longer part of the covered attainment counties that are listed in that subsection. Bexar County is added to the list in §115.419(a) of counties within ozone nonattainment and maintenance areas. Existing §115.419(a) specifies that the compliance date for the counties listed in that subsection has passed and that the owner or operator of an affected source must continue to comply with the existing provisions of Division 1. Including Bexar County in subsection (a) ensures there is no gap in compliance for affected sources in Bexar County during the transition time from covered attainment county to ozone nonattainment area. The compliance obligations in Bexar County are not changed, only the area's status listing in the section.

This adopted rulemaking removes existing §115.419(f) because Wise County's attainment status has been resolved as described elsewhere in the section by section discussion. The commission adopts new subsections (f) and (g) to establish the compliance schedules for the contingency requirements for degreasing operations applicable in the DFW area, the HGB area, or both the DFW and HGB areas.

Adopted new subsections (f) and (g) provide that applicable operations in the affected area(s) must comply with the contingency control requirements, if triggered, for degreasing operations by no later than 270 days after the commission publishes notification in the Texas Register that the contingency measure is necessary. Adopted new subsection (f) will apply in the DFW area and adopted new subsection (g) will apply in the HGB area. The commission adopts the replacement of "nine months" in proposed section §115.419 with "270 days" in the adopted section in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month.

The adopted rulemaking also adds a new subsection (h) to specify that an owner or operator of an affected source in the Bexar County area that becomes subject to the requirements of the division must demonstrate compliance with all applicable requirements of the division no later than 60 days after triggering applicability to the requirements of this division.

Division 2: Surface Coating Processes

§115.420 Applicability and Definitions

The commission adopts the inclusion of the Bexar County area in §115.420(a) to ensure that Division 2 surface coating process RACT requirements are applicable to affected sources in the Bexar County area. Bexar County owners or operators are required to comply with these requirements beginning January 1, 2025. The commission adopts the addition of "Bexar County" to the applicability designations in §115.420(a)(3), (5) - (7), (9), and §115.420(a)(11) - (15). Bexar County sources will be required to comply with the following current Division 2 VOC RACT surface coating categories that are not addressed in current Subchapter E, Division 5: Coil coating, Fabric coating, Vinyl coating, Can coating, Vehicle refinishing coating (body shops), Factory surface coating of flat wood paneling, Aerospace coating, Mirror backing coating, Wood parts and products coating, and Wood manufacturing coating. TCEQ was unable to confirm that applicable sources do not exist in Wise County because sources above the CTG applicability threshold may be small enough to not require registered air permits or emission inventory reporting.

The commission adopts the removal of the exceptions for Wise County in §115.420(a)(9), (10), and (13) - (15). This makes Wise County subject to the same vehicle refinishing coating (body shops), miscellaneous metal parts and products coating, mirror backing coating, wood parts and products coating, and wood manufacturing coating VOC RACT surface coating requirements as the other DFW 2008 ozone NAAQS nonattainment area counties.

§115.422 Control Requirements

The commission adopts the addition of the Bexar County area to §115.422 to make these existing surface coating VOC RACT control requirements applicable to affected sources in the Bexar County 2015 ozone NAAQS nonattainment area. The adopted rulemaking adds the Bexar County area to §115.422(6) to make these existing surface coating VOC RACT control requirements applicable to affected sources in the Bexar County area.

The commission also adopts the addition of the Bexar County area to §115.422(7) to make these existing VOC RACT control requirements applicable to paper surface coating lines, which incorporate work practices to limit VOC emissions, applicable to affected sources in the Bexar County 2015 ozone NAAQS nonattainment area.

Owners or operators of affected sources located in the Bexar County ozone nonattainment area are required to demonstrate compliance with the control requirements for surface coating processes beginning January 1, 2025. The RACT control requirements of §115.422 already exist for other ozone nonattainment areas currently covered under Subchapter E, Division 2.

§115.423 Alternate Control Requirements

The commission adopts the addition of the Bexar County area in §115.423 to make these existing surface coating VOC RACT alternate control requirements available to affected sources in the Bexar County ozone nonattainment area beginning January 1, 2025.

The commission adopts the addition of the Bexar County area in §115.423(3)(B) to make these existing surface coating efficiency testing requirements applicable to affected sources in the Bexar County ozone nonattainment area.

§115.425 Testing Requirements

The commission adopts the addition of the Bexar County area to §115.425 and makes these existing surface coating testing and test method requirements applicable to affected sources in the Bexar County area. These testing requirements currently apply to other ozone nonattainment areas and include specified test methods, test methods for demonstrating compliance with the alternate control requirements of §115.423(3), and test methods for demonstrating compliance with the alternate emission limits of §115.421(11). Owners or operators of affected sources located in the Bexar County ozone nonattainment area are required to comply beginning January 1, 2025.

The commission adopts the addition of the Bexar County area to existing paragraph (4) which currently applies to other ozone nonattainment areas covered under Subchapter E, Division 2. The adopted revision applies existing procedures and testing requirements for determining capture efficiency to affected sources in the Bexar County ozone nonattainment area. The commission adopts amended §115.425(4)(C)(ii) to add a compliance schedule for initial capture efficiency testing for the Bexar County area of 180 days prior to the adopted compliance deadline for the Bexar County ozone nonattainment area in adopted new §115.429(f). This makes the effective deadline for affected facilities in the Bexar County 2015 ozone NAAQS nonattainment to complete such capture efficiency testing July 1, 2024, six months prior to the adopted rulemaking compliance deadline of January 1, 2025.

§115.426 Monitoring and Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to §115.426 and makes these existing surface coating monitoring and recordkeeping requirements applicable to affected sources in the Bexar County ozone nonattainment area. These requirements already apply in other ozone nonattainment areas covered under Subchapter E, Division 2 and are necessary for owners or operators to demonstrate compliance with the VOC RACT requirements of the division for affected sources.

§115.427 Exemptions

The commission adopts the addition of Bexar County to §115.427 to clarify that Bexar County is now a defined ozone nonattainment area. The commission adopts the addition of Bexar County to §115.427(1)(B), and §115.427(3) to provide newly affected sources in the Bexar County ozone nonattainment area with the existing surface coating exemptions that are currently available in other ozone nonattainment areas covered under Subchapter E, Division 2. The commission adopts the deletion of the exception for Wise County in §115.427(9) and provides owners or operators of affected sources in Wise County with the option to claim an exemption that is currently available to the other Dallas-Fort Worth area counties with the same ozone nonattainment classification.

§115.429 Counties and Compliance Schedules

The commission adopts a new subsection to establish a compliance schedule for the new Bexar County ozone nonattainment area. The adopted new subsection specifies that an owner or operator of an affected surface coating process in the Bexar County area is required to demonstrate compliance with all applicable requirements of the division by no later than January 1, 2025. The adopted new subsection also specifies that the owner or operator of a surface coating process in the Bexar county ozone nonattainment area that becomes subject to the requirements of Subchapter E, Division 2 on or after the adopted compliance date of January 1, 2025 is required to comply with all applicable requirements of the division as soon as practicable but no later than 60 days after triggering applicability to the rules of the division. The commission also adopts removal of former §115.429(f) because Wise County's nonattainment designation under the 2008 ozone NAAQS has been resolved. The new subsection applicable for the Bexar County area is added as adopted new §115.429(f).

Division 3: Flexographic And Rotogravure Printing

§115.430 Applicability and Definitions

The commission adopts the addition of the Bexar County area to §115.430(a) to make flexographic and rotogravure printing process VOC RACT requirements under Subchapter E, Division 3 applicable to affected sources in the Bexar County area that become newly subject to the division beginning January 1, 2025.

§115.431 Exemptions

The commission adopts the addition of the Bexar County area to §115.431(a) to provide owners and operators in the Bexar County area with an option to claim exemptions from flexographic and rotogravure printing process ozone nonattainment area regulations that will otherwise apply to newly affected sources upon triggering applicability under adopted revised §115.430. These exemptions currently exist for owners or operators of affected sources located in other ozone nonattainment areas currently covered by Subchapter E, Division 3. The adopted rulemaking also adds the DFW 2008 ozone NAAQS severe nonattainment area to §115.431(a)(2) to lower the 10-county DFW area exemption limit to its new 25 tpy major source threshold for a severe nonattainment area. This change is necessary to address the change in the area's major source threshold of VOC from 50 to 25 tpy based on the area's reclassification from serious to severe ozone nonattainment under the 2008 ozone NAAQS.

The commission adopts application of the exemption in §115.431(a)(3) to the Bexar County area to provide owners or operators of affected sources in the Bexar County area with an option to exempt all flexible package printing lines and associated cleaning operations, that will have a combined weight of total actual VOC emissions for all coatings less than 3.0 tpy, from the existing control requirements of §115.432(c) and (d). This exemption is available for other ozone nonattainment areas with affected sources subject to the control requirements of Subchapter E, Division 3.

The commission adopts revised §115.431(a)(4) to provide owners or operators the option to exempt affected sources in the Bexar County area from the existing control requirements of §115.432(c). These newly affected sources are sources that have an uncontrolled maximum potential to emit VOC of less than 25 tpy for all coatings from newly subject flexible package printing lines. This exemption is available for other affected sources located in other ozone nonattainment areas covered under Subchapter E, Division 3.

§115.432 Control Requirements

The commission adopts the addition of the Bexar County area to §115.432(a) and makes these existing publication and packaging rotogravure and flexographic printing process VOC RACT control requirements applicable to affected sources in the Bexar County area.

The commission adopts the inclusion of the Bexar County area to §115.432(c) and makes these existing flexible packaging printing process VOC RACT control requirements applicable to affected sources in the Bexar County area. Owners or operators of affected sources in the Bexar County area are required to comply with these existing control requirements, which currently apply for affected sources located in other ozone nonattainment areas covered under Subchapter E, Division 3, beginning on the adopted compliance date specified in adopted revised §115.439. To be consistent with a rule start date in existing subsection (c) for other ozone nonattainment areas subject to the requirements of the subsection, the commission adopts a start date of January 1, 2025 for when the control requirements of the subsection will begin to apply for the Bexar County area.

§115.435 Testing Requirements

The commission adopts the addition of the Bexar County area to §115.435(a) and makes the existing testing and test method requirements of the section applicable to affected sources in the Bexar County area. This change is necessary to ensure that affected sources in the Bexar County ozone nonattainment area will be able to demonstrate compliance with the existing flexographic and rotogravure printing process VOC RACT requirements of the division.

These requirements exist for other ozone nonattainment areas currently covered by Division 3.

§115.436 Monitoring and Recordkeeping Requirements

The commission adopts changes to make the existing flexographic and rotogravure printing line monitoring and recordkeeping requirements in §115.436(a) applicable to affected sources in the Bexar County area by including the Bexar County area in §115.436(a).

The commission adopts changes to make the existing flexible package printing line monitoring and recordkeeping requirements in §115.436(c) applicable to affected sources in the Bexar County area by including the Bexar County area in §115.436(c). This change is necessary to ensure that owners or operators of affected sources, specifically flexible package printing lines, in the Bexar County area are required to conduct appropriate and sufficient monitoring and to develop and maintain appropriate and sufficient records of such actions to ensure compliance with the existing flexographic and rotogravure printing process VOC RACT requirements of Subchapter E, Division 3. Compliance is required beginning January 1, 2025. These requirements exist for other ozone nonattainment areas currently covered by Division 3.

§115.439 Counties and Compliance Schedules

The commission adopts the addition of "Bexar County" in §115.439(d) to clarify that the owner or operator of an affected source that becomes subject to the requirements of Subchapter E, Division 3 on or after its applicable compliance date must demonstrate compliance with the requirements of Division 3 as soon as practicable but no later than 60 days after the source becomes subject to the division. For affected sources in the other ozone nonattainment areas covered under Subchapter E, Division 3, the applicable compliance date of March 1, 2013 has passed, and owners or operators of sources in these other areas that become newly subject will have up to 60 days to demonstrate compliance with the division. For newly affected sources in the Bexar County area, the adopted compliance date is specified in adopted new subsection (e). Similarly, owners or operators of sources in the Bexar County area that become newly subject to the requirements of Division 3 on or after the date specified in adopted new §115.439(e) will have up to 60 days to demonstrate compliance with the division.

The commission adopts a new §115.439(e) to establish a compliance schedule for affected sources that become newly subject to the new Bexar County ozone nonattainment area rules. Owners or operators of flexographic or rotogravure printing processes in the Bexar County area that become subject to the requirements of Division 3 must comply with the applicable requirements no later than January 1, 2025.

Division 4. Offset Lithographic Printing

§115.440 Applicability and Definitions

The commission adopts the addition of the Bexar County area to §115.440(a) to make offset lithographic printing process VOC RACT requirements under Subchapter E, Division 4 applicable to affected sources in the Bexar County area that become newly subject to the division beginning January 1, 2025.

The commission adopts revised §115.440(b)(8)(A) by lowering the amount of VOC emissions in the definition for major printing sources for Dallas-Fort Worth counties, except Wise County, from the previous 50 tpy threshold to a 25 tpy threshold. This adopted decrease in the uncontrolled emission threshold for affected major printing sources in the DFW area excluding Wise County takes effect on November 7, 2025. This change is necessary to address the area's severe ozone nonattainment reclassification from serious ozone nonattainment under the 2008 ozone NAAQS. The threshold of 50 tpy for purposes of subparagraph (A) continues to apply through November 6, 2025, after which the threshold of 25 tpy applies.

The commission adopts revised §115.440(b)(8)(C) to lower the amount of VOC emissions in the definition for major printing sources in Wise County to a 25 tpy threshold. This adopted decrease in the uncontrolled emission threshold for major printing sources in Wise County requires compliance on November 7, 2025. This change is necessary to align the major source threshold for Wise County with the rest of the DFW area. The threshold of 100 tpy for purposes of subparagraph (C) continues to apply through November 6, 2025, after which the threshold of 25 tpy applies.

To address the Bexar County area's designation of nonattainment for the 2015 ozone NAAQS, the commission also adopts the addition of a new §115.440(b)(8)(D) that establishes a major printing source threshold of 100 tons of VOC per calendar year for affected sources located in the Bexar County ozone nonattainment area. This applicability threshold for sources in the area applies beginning on January 1,2025.

The commission adopts revised §115.440(b)(9)(A) to lower the amount of VOC emissions in the definition for minor printing sources for Dallas-Fort Worth counties, except Wise County, from the previous threshold of less than 50 tpy to a threshold of less than 25 tpy. This adopted decrease in the uncontrolled emission threshold for affected minor printing sources in the DFW area, excluding Wise County, takes effect on November 7, 2025. This change is necessary to address the area's severe ozone nonattainment reclassification from serious ozone nonattainment under the 2008 ozone NAAQS. The threshold of less than 50 tpy for purposes of subparagraph (A) of paragraph (9) continues to apply through November 6, 2025, after which the threshold of less than 25 tpy applies.

The commission adopts revised §115.440(b)(9)(C) to lower the amount of VOC emissions in the definition for minor printing sources in Wise County to a threshold of less than 25 tpy. This adopted decrease in the uncontrolled emission threshold for minor printing sources in Wise County requires compliance on November 7, 2025. This change is necessary to align the major source threshold for Wise County with the rest of the DFW area. The threshold of less than 100 tpy for purposes of subparagraph (C) of paragraph (9) continues to apply through November 6, 2025 after which the threshold of less than 25 tpy applies.

To address the Bexar County area's designation of nonattainment for the 2015 ozone NAAQS, the commission also adopts the addition of a new §115.440(b)(9)(D) that establishes a minor printing source threshold at less than 100 tons of VOC per calendar year for affected sources located in the Bexar County ozone nonattainment area. This applicability threshold for sources in the area applies beginning on January 1, 2025.

§115.441 Exemptions

The commission adopts the addition of the Bexar County area to §115.441(a) and provides owners or operators of affected sources in the Bexar County area with an option to exempt all offset lithographic printing lines, with combined VOC emissions for all coatings of less than 3.0 tons per year, when uncontrolled, from the existing monitoring and recordkeeping requirements of §115.446 for offset lithographic printing processes. This exemption is available for affected sources located in other ozone nonattainment areas currently covered by Subchapter E, Division 4.

The commission adopts the addition of the Bexar County area to §115.441(b) to allow owners or operators of minor printing sources in the Bexar County area to claim exemptions from otherwise applicable control requirements under §115.442(c). These same exemptions currently exist for similar affected sources located in other ozone nonattainment areas that are also covered by Subchapter E, Division 4. Owners or operators of affected sources located in the Bexar County area will be able to claim these exemptions beginning January 1, 2025.

§115.442 Control Requirements

The commission adopts the addition of the Bexar County area to §115.442(b) to specify that the major source offset lithographic printing process VOC RACT control requirements applies to affected sources in the Bexar County area that become newly subject to the requirements of the division after triggering applicability under §115.440. This change is necessary to include the newly designated Bexar County ozone nonattainment area for purposes of the 2015 ozone NAAQS.

The commission adopts the addition of the Bexar County area to §115.442(c) to specify that the minor source offset lithographic printing process material VOC limits apply to affected sources in the Bexar County area upon those sources triggering applicability under §115.440 and becoming newly subject to the requirements of Division 4. This change is necessary to include the newly designated Bexar County ozone nonattainment area for purposes of the 2015 ozone NAAQS.

These control requirements apply to owners or operators of affected sources in the Bexar County area subject to the requirements of the division beginning on January 1, 2025.

§115.443 Alternate Control Requirements

The commission adopts the addition of the Bexar County area to §115.443 and enables affected sources in the Bexar County area to comply with lithographic printing process alternative control requirements approved by the executive director. This offset lithographic printing alternative control requirement compliance option is already available for affected sources located in other ozone nonattainment areas covered under Subchapter E, Division 4. These alternate control provisions apply beginning January 1, 2025.

§115.445 Approved Test Methods

The commission adopts the addition of the Bexar County area to §115.445 to make the current testing and test method requirements of the section applicable to affected sources in the Bexar County area. This change is necessary to ensure that affected sources in the Bexar County ozone nonattainment area demonstrate compliance with the existing offset lithographic printing process VOC RACT requirements of the division.

These requirements exist for other ozone nonattainment areas currently covered by Division 4. Owners or operators must use these methods and procedures beginning January 1, 2025.

§115.446 Monitoring and Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to §115.446(b) to specify that owners or operators of affected sources in the Bexar County area are required to conduct monitoring and develop and maintain records according to the existing requirements of §115.446(b). This adopted change is necessary to ensure compliance with the existing offset lithographic printing process VOC RACT requirements of Subchapter E, Division 4. The monitoring and recordkeeping requirements are already applicable to other affected offset lithographic printing sources in other ozone nonattainment areas covered under Division 4. Compliance with these requirements for the Bexar County area begins January 1, 2025.

§115.449 Compliance Schedules

The commission adopts the addition of a new subsection to establish a compliance schedule for the Bexar County 2015 ozone NAAQS nonattainment area that requires compliance with applicable requirements of Subchapter E, Division 4 by no later than January 1, 2025. This adopted new subsection is added as subsection (h), and former subsection (h) is renumbered to subsection (i). The compliance schedule in adopted renumbered §115.449(i) is revised to add Bexar County to the list of counties subject to the compliance provisions for affected sources that become subject to the requirements of Subchapter E, Division 4 on or after the applicable compliance date. The reference in adopted renumbered subsection (i) to §115.449 subsections covered under that provision is revised to include the adopted new subsection (h) compliance schedule for Bexar County. Former §115.449(i), which previously provided for the publication in the Texas Register by the commission and the litigation concerning Wise County for the 2008 Eight-Hour Ozone NAAQS, is removed since the Wise County litigation has been resolved and this provision is no longer relevant.

Division 5. Control Requirements For Surface Coating Processes

The commission adopts amended Subchapter E, Division 5 to establish new traffic marking coating provisions that will be implemented in the DFW and/or HGB 2008 ozone NAAQS nonattainment areas if triggered for SIP contingency purposes. The commission adopts changes to make the current surface coating process VOC RACT requirements in this division applicable to affected sources in the Bexar County area.

§115.450 Applicability and Definitions

The commission adopts the addition of the Bexar County area in §115.450(a) and §115.450(a)(6) to expand these current surface coating process VOC RACT requirements in this division to affected sources in the Bexar County area. Owners or operators of affected sources in the Bexar County ozone nonattainment area are required to comply with the applicable requirements of the division beginning January 1, 2025.

Two exceptions are adopted in subsection (a) of §115.450 to allow for the potential applicability of contingency control measures for sources that meet either of the new specific surface coating definitions that are adopted in §115.450(c) for industrial maintenance coatings and traffic marking coatings. These contingency measures will be applicable in either or both the DFW and HGB areas, if triggered. The adopted applicability provisions are added as new §115.450(a)(7) for industrial maintenance coatings and as §115.450(a)(8) for traffic marking coatings. Adopted formatting adjustments will be made to subsection (a) for clarity purposes.

No general definitions are adopted for subsection (b), but two new specific surface coating definitions are adopted for subsection (c). An adopted definition for industrial maintenance coating is added as §115.450(c)(3) to apply for the adopted industrial maintenance coating contingency measure in Subchapter E, Division 5. The adopted new definition for industrial maintenance coatings does not apply to coatings applied to items that meet the definition for Miscellaneous metal parts and products in §115.450(c)(6)(Q). The new adopted definition for traffic marking coating is added as §115.450(c)(10) to apply for the adopted traffic marking coating contingency measure in Subchapter E, Division 5. The adopted new definitions reflect the definitions used in national rules and the rules of other states. The existing definitions are renumbered to accommodate the adopted new definitions.

§115.451 Exemptions

Revisions to the exemptions in §115.451 are adopted to accommodate the two contingency control requirements adopted in Subchapter E, Division 5. An exception is adopted in subsection (a) to allow for the potential that the current exemptions will not apply under a contingency scenario, and new paragraphs (4) and (5) are adopted to stipulate that exemptions in existing §115.451(a)(1) - (3) will no longer apply for industrial maintenance coatings and traffic marking coatings, respectively, once either or both contingency measures are applicable in either or both the DFW and HGB areas. Additionally, a revision is adopted for the exemption for aerosol coatings in §115.451(l) to remove that exemption for the industrial maintenance and traffic marking coatings because many of the industrial maintenance and traffic marking coatings are available in both aerosol and non-aerosol forms and the aerosol forms are commonly above the VOC limit.

For owners or operators of affected sources in the Bexar County ozone nonattainment area that become newly subject to the requirements of Subchapter E, Division 5, affected persons will be able to claim applicable exemptions beginning January 1, 2025.

§115.453 Control Requirements

Revisions are adopted to the control requirements in §115.453 to accommodate the two contingency control requirements adopted in Division 5. A provision is added to existing subsection (a) to clarify that the two adopted contingency control requirements in adopted new §115.453(f) - (i) will apply in addition to those in subsection (a) upon the compliance date specified in adopted new §115.459(e) - (h). Emissions limits for industrial maintenance coatings are adopted as new subsections (f) and (g), and emissions limits for traffic marking coatings are adopted as new subsections (h) and (i), to establish control requirements for contingency purposes applicable to certain surface coating processes in Subchapter E, Division 5.

The contingency control requirement for industrial maintenance coatings, if triggered, will set a VOC limit of 2.1 pounds per gallon or 250 grams per liter of coating (minus water and exempt solvent) to be met by applying low-VOC coatings. The limits of 2.1 pounds per gallon and 250 grams per liter are considered equivalent. The contingency control requirement for traffic marking coatings will set a VOC content limit of 100 grams of VOC per liter of coating (minus water and exempt solvent) to be met by applying low-VOC coatings. Adopted new subsection (f) will set the industrial maintenance coatings limit for the DFW area, and adopted new subsection (g) will set the industrial maintenance coatings limit for the HGB area. Likewise, adopted new subsection (h) will set the traffic marking coatings limit for the DFW area, and adopted new subsection (i) will set the traffic marking coatings limit for the HGB area. The adopted limits, if either or both are necessary, will help achieve required emissions reductions for SIP contingency purposes.

The existing control requirements in §115.453 apply to the areas listed in the applicability provisions in §115.450, which are amended to include the Bexar County area. As such, owners or operators of affected sources in the Bexar County ozone nonattainment area must comply with the applicable control requirements in §115.453 beginning January 1, 2025.

§115.458 Monitoring and Recordkeeping Requirements

Under the monitoring and recordkeeping requirements for surface coating processes in §115.458, references to the contingency control requirements in adopted new §115.453(f) - (i) are adopted in §115.458(b)(1), recordkeeping requirements. The references are added to require that records must demonstrate compliance with the applicable VOC limits, whether the existing limits or those applicable if either or both contingency measures are triggered in either or both the DFW and HGB areas.

The existing monitoring and recordkeeping requirements in §115.458 apply to the areas listed in the applicability provisions in §115.450, which are amended to include the Bexar County area. As such, owners or operators of affected sources in the Bexar County ozone nonattainment area are subject to the monitoring and recordkeeping requirements in §115.458 beginning January 1, 2025.

§115.459 Compliance Schedules

This adopted rulemaking amends subsection (a) to clarify that compliance with the contingency measures in adopted new §115.453(f) - (i) will not be required until the commission publishes notification in the Texas Register of its determination that a contingency rule is necessary. The adopted rulemaking also revises existing subsection (b), for Wise County, to clarify that the compliance date in that subsection will not apply for the adopted new contingency requirements under adopted new subsections (f) through (i) of adopted revised §115.453.

The commission adopts a new subsection to establish a compliance schedule for the Bexar County 2015 ozone NAAQS nonattainment area that requires compliance with applicable requirements of Subchapter E, Division 5 by no later than January 1, 2025. This adopted new subsection is added as subsection (c), and existing subsection (c) is renumbered to subsection (d). Adopted revisions remove existing §115.459(d) because Wise County's attainment status has been resolved, and Wise County remains designated nonattainment for the 2008 eight-hour ozone NAAQS.

Adopted new subsections (e) - (h) are added to establish the compliance schedules for the industrial maintenance coating and traffic marking coating contingency requirements that will be applicable, if triggered, in the DFW area, the HGB area, or both areas. Adopted new subsections (e) and (f) provide that surface coating processes in the DFW area must comply with the industrial maintenance coating and/or traffic marking coating contingency control requirements, respectively, by no later than 270 days after the commission publishes notification in the Texas Register that one or both of the contingency measures are necessary. The commission adopts the replacement of "nine months" in proposed section §115.459 with "270 days" in the adopted section in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month.

Adopted new subsections (g) and (h) provide that surface coating processes in the HGB area must comply with the industrial maintenance coating and/or traffic marking coating contingency control requirements, respectively, by no later than 270 days after the commission publishes notification in the Texas Register that one or both of the contingency measures are necessary.

Division 6. Industrial Cleaning Solvents

The commission adopts amended Subchapter E, Division 6 to establish a new limit for industrial cleaning solvents to be implemented in either the DFW or HGB or both 2008 ozone NAAQS nonattainment areas if triggered for SIP contingency purposes. The commission also adopts amendments to Division 6 to make the current surface coating process VOC RACT requirements in this division applicable to affected sources in the Bexar County area.

§115.460 Applicability and Definitions

The commission adopts the addition of the Bexar County area in §115.460(a) to make these existing VOC RACT requirements for industrial cleaning solvents applicable to affected sources in the Bexar County area. Owners or operators of affected sources in the Bexar County ozone nonattainment area must comply with the applicable requirements of the division beginning January 1, 2025.

Adopted language is added to the contingency rule definitions in §115.460(b) to clarify and support new industrial cleaning solvent contingency rule provisions. Adopted revisions to existing §115.460(b) contain new and amended definitions for the following: application device; application line; blanket; blanket wash; cured coating, cured ink, or cured adhesive; electronic component, electron beam ink; facility; grams of VOC per liter of material; graphic arts; gravure printing; high precision optic; hot-line tool; letterpress printing; liquid-tight food container; lithographic printing; maintenance cleaning; manufacturing process; medical device; medical or pharmaceutical work surface; non-absorbent container; on-press component; on-press screen cleaning; packaging printing; pharmaceutical product; photocurable resin; printing; removable press component; repair cleaning; repair process; roller wash; scientific instrument; screen printing; solvent cleaning operation; solvent flushing; specialty flexographic printing; stereolithography; stripping; surface preparation; and ultraviolet ink. Additionally, some of the existing definitions in §115.460 are reordered and renumbered alphabetically.

The adopted new definition for medical device is a replacement of the previous version to improve readability. The adopted revised definition for electrical and electronic components includes new language specifying how electronic component and electrical component are defined differently for the purpose of the contingency measure provisions of the division. This allows continued use of the existing definition for existing uses while specifying a different definition as used in the rules of other states when describing use in the contingency measure portions of this division. The term solvent cleaning operation also receives additional adopted phrasing in its definition that is applicable only in the context of the contingency measure provisions to harmonize with its use in the rules of other states.

§115.461 Exemptions

The commission adopts the renumbering of the former §115.461(e) aerosol can exemption as §115.461(f) and concurrently adopts a new subsection (e) that specifies exemption provisions that will become applicable to affected sources or activities in the DFW area, the HGB area, or both, if the contingency requirements of Subchapter E, Division 6 are triggered as provided for in adopted new §115.469(d), for the DFW area, in §115.469(e) for the HGB area.

Upon triggering of the contingency requirements under adopted new §115.463(e), these new exemptions under adopted new §115.461(e) will replace those in existing §115.461(a) - (d). The commission makes clear that the provisions of adopted new subsection (e) will apply if contingency requirements are triggered, and adopted renumbered (f) will also continue to apply; otherwise, the existing provisions of subsections (a) - (d), and now adopted renumbered (f), will apply. Adopted revisions to the last sentence of existing §115.461(a) will reflect that industrial cleaning solvent emissions currently exempted under existing §115.461(b) - (d) and (e), which is concurrently adopted as renumbered (f), will continue to not count towards the 3.0 tons of VOC per calendar year exemption limit under §115.461(a).

Adopted new subsection (e)(1) specifies the types of cleaning that will be exempt in the DFW area, through adopted new subparagraphs (A) - (L), and adopted new subsection (e)(2) specifies the types of cleaning that will be exempt in the HGB area, through adopted new subparagraphs (A) - (L). In a change from proposal, §115.461(e)(2) is revised to refer to the correct cleaning solvent content limits for the HGB area in §115.463(e)(2).

For owners or operators of affected sources in the Bexar County ozone nonattainment area that become newly subject to the requirements of Subchapter E, Division 6, affected persons will be able to claim applicable exemptions beginning January 1, 2025.

§115.463 Control Requirements

Existing §115.463(a)(1) and (2) provisions limit the industrial cleaning solvent VOC content to 0.42 pounds per gallon (lb VOC/gal), which is equivalent to 50 grams/liter (g/l) or a composite partial pressure of 8.0 millimeters of mercury (mmHg) at 20 degrees Celsius, respectively. The adopted rulemaking adds a new §115.463(e) to include new requirements concerning SIP contingency measures and requirements. Adopted new §115.463(e) contains new VOC content limits listed in adopted new Figure: 30 TAC §115.463(e) that will become effective upon EPA publication of a notice in the Federal Register that the specified area(s) failed to attain the applicable ozone NAAQS by the attainment date or failed to demonstrate RFP, and the commission's subsequent publication in the Texas Register confirming that compliance with the DFW and/or HGB contingency measures is required. Compliance will be required by no later than 270 days after Texas Register publication as stated in §115.469 Compliance Schedules. The commission adopts the replacement of "nine months" in proposed section §115.463 with "270 days" in the adopted section in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month.

Owners or operators of affected sources in the Bexar County ozone nonattainment area must comply with the applicable control requirements of this division beginning January 1, 2025.

§115.465 Approved Test Methods and Testing Requirements

Minor revisions are adopted in §115.465 to update the section references to align with the structure of adopted Subchapter E, Division 6. Existing test methods and requirements in §115.465 are adopted to incorporate test methods and testing requirements for the industrial cleaning solvent contingency control measure. This includes industrial cleaning solvent VOC content and vapor pressure test methods. These requirements exist for other ozone nonattainment areas currently subject to Subchapter E, Division 6. Owners or operators of affected sources in the Bexar County 2015 ozone NAAQS nonattainment area must use these methods and procedures beginning January 1, 2025.

§115.468 Monitoring and Recordkeeping Requirements

Revisions to the existing monitoring and recordkeeping requirements in §115.468 are adopted to incorporate recordkeeping requirements for the industrial cleaning solvents contingency control measure. The recordkeeping requirements in §115.468(b)(1) are amended to specify that records must be kept that demonstrate continuous compliance with the applicable new §115.463(e) requirements. Owners or operators of affected sources in the Bexar County ozone nonattainment area are subject to the monitoring and recordkeeping requirements of this division beginning January 1, 2025.

§115.469 Compliance Schedules

The commission adopts to combine existing §115.469(a) and (b) under adopted §115.469(a) to clarify that compliance requirements that are applicable to Wise County are identical to the requirements that are applicable to the nonattainment counties comprising the 10-County DFW nonattainment area for the 2008 severe ozone NAAQS. These same compliance requirements for the 10-county DFW 2008 ozone NAAQS severe nonattainment area are also identical to the requirements that are applicable to the eight-county HGB 2008 ozone NAAQS severe nonattainment area. In all these counties, the compliance date has passed and compliance is required, except for the adopted contingency measures, as stated in adopted new subsections (d) and (e) of this section.

The commission adopts a new §115.469(b) that establishes a compliance schedule for newly affected sources located in the Bexar County ozone nonattainment area that will become subject to the requirements of Subchapter E, Division 6 on January 1, 2025. Owners or operators of newly affected sources subject to the industrial cleaning solvent requirements of the division must comply with all applicable requirements of the division no later than January 1, 2025.

This adopted rulemaking removes existing §115.469(d) because Wise County's attainment status has been resolved, and Wise County remains designated nonattainment for the 2008 eight-hour ozone NAAQS.

The commission adopts new §115.469(d) and (e) that establishes the compliance schedules for the SIP contingency requirements concerning industrial cleaning solvents that, if triggered, will be applicable in the DFW and/or HGB area. Adopted new subsection (d) and adopted new subsection (e) specify that applicable operations in the affected area(s) will be required to comply with the new contingency control requirements adopted in new §115.463(e) for industrial cleaning solvents by no later than 270 days after the commission publishes notification in the Texas Register that the contingency measure is necessary. Adopted new subsection (d) will apply in the DFW area, and adopted new subsection (e) will apply in the HGB area. The commission adopts the replacement of "nine months" in proposed section §115.469 with "270 days" in the adopted section in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month.

Division 7. Miscellaneous Industrial Adhesives

The commission adopts changes to make the current surface coating process VOC RACT requirements in this division applicable to affected sources in the Bexar County area beginning January 1, 2025.

The commission also amends Subchapter E, Division 7 to establish a new limit for industrial adhesives to be implemented in the DFW and/or HGB 2008 ozone NAAQS nonattainment areas if triggered for SIP contingency purposes.

During review of comments submitted, TCEQ staff realized that they had omitted a portion of the intended VOC content limit tables from this proposed rulemaking, as published in the Texas Register on December 15, 2023 (48 TexReg 7290). The omitted content limits were included in the emissions reductions calculation in the concurrently proposed DFW and HGB Attainment Demonstration and RFP SIP revisions. In addition, staff inadvertently used inconsistent VOC content limits in the proposed rule language and the emissions reductions calculations.

As proposed and adopted in this rulemaking and the concurrently adopted DFW and HGB Attainment Demonstration and RFP SIP revisions, the VOC emissions reductions from the industrial adhesives contingency measure are documented as 1.05 tons per day (tpd) in the DFW area and 0.99 tpd in the HGB area. The Executive Director intends to immediately initiate an Industrial Adhesives Contingency Measure Corrections rulemaking (corrections rulemaking) for commission consideration to amend the adhesive VOC content limits in this newly adopted rulemaking to match the originally intended limits and to add additional source categories that were inadvertently excluded from the industrial adhesives category.

If adopted, the potential corrections rulemaking would result in additional VOC emissions reductions of 2.26 tpd in the DFW area and 2.13 tpd in the HGB area resulting in final emissions reductions of 3.31 tpd in the DFW area and 3.12 tpd in the HGB area. Therefore, if adopted, the corrections rulemaking would restore the emissions reductions to the amounts described in the contingency plan narratives in the concurrently proposed and adopted DFW AD SIP revision (Project 2023-107-SIP-NR), the HGB AD SIP revision (Project 2023-110-SIP-NR), and the DFW-HGB RFP SIP revision (Project 2023-108-SIP-NR).

If proposed and adopted, the corrections rulemaking would amend Table 1 of Figures 30 TAC §115.473(e) and (f) as shown below by adding underlined text, deleting text marked with strikethrough, and revising the first column name for clarity. If proposed and adopted, the corrections rulemaking would also add definitions to 30 TAC §115.470(b) for adhesive categories inadvertently omitted.

Since the fiscal note information published in the proposal for the 30 TAC Chapter 115 rulemaking (Project No. 2023-116-115-AI), reflected the cost per ton of VOC to achieve the intended emissions reductions, as documented in the concurrently proposed DFW and HGB Attainment Demonstration and RFP SIP revisions, the public has already been informed of all expected costs to affected businesses that would result if the corrections rulemaking were proposed and adopted.

§115.470 Applicability and Definitions

The commission adopts the addition of the Bexar County area in §115.450(a) to make these current industrial adhesives VOC RACT requirements applicable to affected sources in the Bexar County area beginning January 1, 2025.

Adopted language is added to expand applicability from application processes in §115.473(a) to all of §115.473 with the adopted revision of the citation in §115.470(a) from §115.473(a) to §115.473. This expansion allows applicability to be extended to the adopted new adhesives contingency measure, if triggered. Also, under §115.470, a new term and definition are adopted as §115.470(b)(43) for specialty adhesives, and the existing definitions are renumbered accordingly.

§115.471 Exemptions

Exceptions to the existing exemptions in §115.471(a)- (c) are adopted to allow for the potential that existing exemptions will not apply under a contingency scenario, and the term "applicable" is added to existing subsection (c) to clarify that the appropriate VOC content limit must be considered to determine whether an adhesive application process qualifies for exemption. Adopted new §115.471(d) is added to stipulate that the exemptions in §115.471(a)- (c) will no longer be available under a contingency scenario in either the DFW or HGB area, or both areas, and to allow exemptions for applicable processes if the adhesives contingency control requirements apply. Adopted exemptions are listed in new paragraphs (1) and (2) of adopted new §115.471(d) and include an exemption in new paragraph (1) from all but the applicable monitoring and recordkeeping requirements if it can be demonstrated that the total volume of noncompliant products is less than 55 gallons per calendar year. Adopted new paragraph (1) also stipulates that the paragraph may not be used to exclude noncompliant adhesives used in architectural applications; contact adhesives; special purpose contact adhesives; adhesives used on porous substrates; rubber vulcanization adhesives, and top and trim adhesives. Finally, adopted new paragraph (2) provides exemptions for 10 adhesive application processes if the adhesives contingency control requirements apply.

§115.473 Control Requirements

Adopted contingency control requirements are added to §115.473 for adhesive application processes. To allow for the contingency control requirements to apply, an adopted provision is added to the existing subsection (a) requirements to clarify that the requirements in that subsection will be replaced by the contingency requirements in adopted new subsections (e) or (f) if they are required for contingency purposes in the DFW area or HGB area, respectively. Adopted emissions limits for contingency are added as subsection (e) for the DFW area and (f) for the HGB area. The adopted contingency control requirements are the same for both areas and establish VOC emissions limits for application processes specified in the tables in adopted §115.473(e) and §115.473(f) for which adhesives and adhesive primers are used. The adopted control requirements also specify that the limits must be met by applying low-VOC adhesives or adhesive primers.

§115.475 Approved Test Methods and Testing Requirements

Revisions to the existing test methods and requirements in §115.475 are adopted to incorporate test methods and testing requirements for the adhesives contingency control measure. This includes test methods for reactive adhesives, subparagraph (B), and all other applicable adhesives, paragraph (1).

§115.478 Monitoring and Recordkeeping Requirements

Revisions to the existing monitoring and recordkeeping requirements in §115.468 are adopted to incorporate recordkeeping requirements for the miscellaneous industrial adhesives contingency control measure. The recordkeeping requirements in §115.478(b)(1) are amended to specify that records must be kept that demonstrate continuous compliance with the applicable new §115.473(e)- (f) requirements.

§115.479 Compliance Schedules

The commission adopts removal of former subsection (b) and adds Wise County to the list of counties covered under existing subsection (a) to further specify that the compliance date for all listed counties has passed, and compliance is required, except for the adopted contingency measures, as stated in adopted new subsections (c) and (d) of this section. Former subsection (c) is concurrently adopted to be renumbered as subsection (b).

This adopted rulemaking removes existing §115.479(d) because Wise County's attainment status has been resolved, and Wise County remains designated nonattainment for the 2008 eight-hour ozone NAAQS. The removal of this language allows for greater clarity in the rules for this division and removes any doubt concerning the nonattainment status of Wise County.

Adopted new subsections (c) and (d) are added to establish the compliance schedules for the adhesives contingency requirements that, if a triggered as contingency, will be applicable in the DFW area, the HGB area, or both areas. Adopted new subsections (c) and (d) provide that applicable operations in the affected area(s) must comply with the adhesives contingency control requirements by no later than 270 days after the commission publishes notification in the Texas Register that the contingency measure is required. Adopted new subsection (c) will apply in the DFW area, and adopted new subsection (d) will apply in the HGB area. The commission adopts the replacement of "nine months" in proposed section §115.479 with "270 days" in the adopted section in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month.

The commission adopts a new §115.479(e) rule to establish a compliance schedule for the new Bexar County area industrial adhesives nonattainment rules. Owners or operators of affected sources that become subject to the applicable requirements of Subchapter E, Division 7 must demonstrate compliance with all applicable requirements of the division beginning January 1, 2025.

Subchapter F. Miscellaneous Industrial Sources.

Division 1. Use Of Asphalt

The commission adopts amended Subchapter F, Division 1 to change the name from "Cutback Asphalt" to "Use of Asphalt." Since its inception, the division has contained requirements pertaining to the use of both cutback and emulsified asphalt, not just cutback asphalt. This name change brings the division title in line with its content and alleviates confusion with its applicability to the production of various types of asphalt.

Contingency Measure: Emulsified Asphalt

The commission adopts amended Subchapter F, Division 1 to define and establish a new contingency rule limit for emulsified asphalt in the DFW and/or HGB 2008 ozone nonattainment areas.

§115.510 Cutback Asphalt Definitions

The commission adopts the deletion of "Cutback Asphalt" and "Cutback" from the title and first line of adopted §115.510, respectively, to clarify that both cutback and emulsified asphalt materials are subject to the commission's adopted Subchapter F, Division 1 requirements. The commission adopts insertion of "Use of" immediately after "relating to" in the first line of adopted §115.510 for clarification purposes. The commission also adopts a revision to the existing §115.510(1) definition to clarify that emulsified asphalt is an interchangeable term for asphalt emulsion.

§115.512 Control Requirements

The commission adopts the division of §115.512 into subsections (a) and (b) that contain existing control provisions and new contingency control requirements, respectively. The commission adopts the addition of the Bexar County area to §115.512(a) and makes these existing cutback asphalt VOC RACT control requirements applicable to affected sources in the Bexar County area. Additionally, the commission adopts the addition of the Bexar County area to §115.512(a)(2) and makes these existing cutback asphalt VOC RACT control requirements applicable to affected sources in the Bexar County area.

The commission adopts new language at the beginning of §115.512(a)(3) to clarify that the existing rule for emulsified asphalt VOC content limits no longer applies when a VOC contingency rule is triggered. Finally, non-substantive changes are adopted in §115.512(a)(3)(B)- (D) to align terms in the existing asphalt emulsion VOC limits with industry standard terminology and with terms used in the adopted contingency measure subsection §115.512(b).

The commission adopts new subsection (b) language to establish and differentiate more stringent contingency rule control requirements from existing §115.512(a) VOC content limits during the local ozone season. Adopted new §115.512(b) language specifies that the asphalt contingency rule VOC content limits are applicable when the commission publishes notification in the Texas Register. Newly Adopted §115.512(b)(1) and (2) provisions establish an emulsified asphalt 0.5% by volume VOC contingency limit in the DFW and HGB areas during their unique ozone season, respectively. The non-ozone season emulsified asphalt limits for the DFW area are the same as §115.512(a)(3) and are repeated in §115.512(b)(1) as new subparagraphs (A)- (D) for clarity. The non-ozone season limits include the same industry standard terminology updates adopted in §115.512(a)(3)(B)- (D). Since the HGB area has a year-round ozone season, there is no need to specify non-ozone season limits. The DFW area ozone season is March 1 through November 30. This is a change from the applicability period for the current non-contingency cutback asphalt regulations of April 15 to September 15. This change is necessary to align applicability of the two limits and to update the DFW ozone season to the current EPA definition.

§115.515 Testing Requirements

The commission adopts the division of §115.515 into subsections (a) and (b) that contain current test method language updates and new contingency test methods, respectively. Subsection (a) contains clarification language for existing test methods and renumbers existing paragraph (3), which allows minor test method modifications approved by the executive director, to paragraph (4). Former paragraph (3) is replaced with language allowing the use of additional test methods validated by 40 CFR 63, Appendix A, Test Method 301 and approved by the executive director.

The commission adopts new §115.515(b) to establish test methods for the contingency measure in this division. These new contingency test methods are specified in adopted §115.515(b)(1), (2), and (3). Use of American Association of State Highway and Transportation Officials (AASHTO) Test Method AASHTO T 59 is adopted because it is used in state and local emulsified asphalt specifications to quantify VOC content by volume percent.

§115.516 Recordkeeping Requirements

The commission adopts the addition of the Bexar County area to §115.516 and makes the current cutback asphalt or asphalt emulsion recordkeeping requirements applicable to affected sources in the Bexar County area. The requirements are already applicable to affected cutback asphalt or asphalt emulsion sources in the Nueces, Bastrop, Caldwell, Hays, Travis, and Williamson Counties and the Beaumont-Port Arthur, Dallas-Fort Worth, El Paso, and Houston-Galveston areas under current VOC RACT rules.

§115.517 Exemptions

The commission adopts the addition of the Bexar County area to §115.517 and provides affected sources in the Bexar County area with the exemptions that are already applicable to affected asphalt sources located in other ozone nonattainment areas currently covered under Subchapter F, Division 1.

§115.519 Counties and Compliance Schedules

The commission adopts the consolidation of some expired DFW area RACT compliance schedules, the deletion of outdated subsections and language, the insertion of Bexar County RACT compliance schedule, and the addition of new contingency rule compliance schedules to §115.519, to harmonize the section title with the standard form used in other divisions of this chapter.

The adopted rulemaking clarifies in §115.519(a) that control requirements for cutback asphalt remain in place if a contingency measure is triggered. Compliance requirements for all ozone nonattainment counties for which the compliance date has passed are consolidated into revised §115.519(a) by adding Ellis, Johnson, Kaufman, Parker, and Rockwall Counties from current §115.519(c) and Wise County from current §115.519(d). The adopted rulemaking removes current §115.519(c) and (d) as part of the adopted consolidation.

This adopted rulemaking also removes existing §115.519(e) because Wise County's attainment status has been resolved, and Wise County remains designated nonattainment for the 2008 eight-hour ozone NAAQS. The removal of this language allows for greater clarity in the rules for this division and removes any doubt concerning the nonattainment status of Wise County.

Adopted new subsections (c) and (d) are added to establish the compliance schedules for the emulsified asphalt contingency requirements applicable in the DFW and/or HGB areas. Adopted subsections (c) and (d) provide that applicable operations in the affected area(s) must comply with the emulsified asphalt contingency control requirements by no later than 270 days after the commission publishes notification in the Texas Register that the contingency measure is necessary. Adopted new subsection (c) will apply in the DFW area and adopted new subsection (d) will apply in the HGB area. The commission adopts the replacement of "nine months" in proposed section §115.519 with "270 days" in the adopted section in order to clarify the compliance date for contingency measures in the event that they are triggered. Number of days is more precise than months and allows for consistency in application and alleviates confusion associated with calculating a nine-month period that may begin and/or end outside of a defined calendar month.

The commission adopts a new §115.519(e) to establish a compliance schedule for the new Bexar County area asphalt nonattainment rules. The new compliance schedule requires compliance with the division by no later than January 1, 2025.

The commission adopts a new §115.519(f) to establish a compliance schedule for persons newly subject to the division after the applicable compliance date. Such persons have 60 days to achieve compliance after becoming subject to this division. This provision is adopted to be consistent with compliance schedule provisions in the other divisions of this subchapter.

Division 2. Pharmaceutical Manufacturing Facilities

§115.531 Emission Specifications

The commission adopts the addition of Bexar County to §115.531(a) and requires affected sources in the Bexar County area to meet emission specifications applicable to synthesized pharmaceutical manufacturing facilities. These same emission specifications currently apply to similar facilities located in other ozone nonattainment areas covered by Subchapter F, Division 1 to satisfy VOC RACT requirements.

§115.532 Control Requirements

The commission adopts the addition of Bexar County in §115.532(a) and makes affected Bexar County sources subject to current nonattainment area pharmaceutical manufacturing facility VOC RACT control requirements beginning January 1, 2025.

§115.534 Inspection Requirements

The commission adopts the addition of Bexar County to §115.534(a) and makes affected sources in the Bexar County area subject to existing inspection requirements of the subsection. These requirements currently apply to affected sources located in other ozone nonattainment areas covered by the division. This adopted change is necessary to ensure that owners or operators of affected sources in the Bexar County area use the appropriate procedures necessary to show compliance with the applicable emission specifications and control requirements of the division.

§115.535 Testing Requirements

The commission adopts the addition of Bexar County in §115.535(a) and makes affected sources in the Bexar County area subject to existing nonattainment area pharmaceutical manufacturing facility VOC RACT testing requirements.

§115.536 Monitoring and Recordkeeping Requirements

The commission adopts the addition of Bexar County to §115.536(a) and requires an owner or operator of an affected source located in the Bexar County ozone nonattainment area to conduct the appropriate monitoring and to develop and maintain the appropriate records necessary to demonstrate compliance with applicable emission specifications and control requirements of Subchapter F, Division 2. These same requirements apply to affected sources located in other ozone nonattainment areas covered by the division.

§115.537 Exemptions

The commission adopts the addition of Bexar County to §115.537(a) and makes the pharmaceutical manufacturing facility exemptions available to affected sources located in the Bexar County ozone nonattainment area. These same exemptions are currently available to affected sources located in other ozone nonattainment areas covered under Subchapter F, Division 2.

§115.539 Counties and Compliance Schedules

The commission adopts a new §115.539(c) rule to establish a compliance schedule for the adopted Bexar County area pharmaceutical manufacturing facility requirements that is added to this division. The new §115.539(c) requires affected persons in Bexar County to comply with requirements in Subchapter F, Division 2 as soon as practicable, but no later than January 1, 2025.

Subchapter J. Administrative Provisions

Division 1. Alternate Means Of Control

§115.901 Insignificant Emissions

The commission adopts to insert the language "as defined in §115.10 of this title (relating to Definitions)" immediately after "Travis Counties" in §115.901 and specify that this section no longer applies in Bexar County after December 31, 2024 when it no longer meets the definition of a covered attainment county. This clarifies that adopted §115.901, which authorizes the executive director to provide an exemption for certain insignificant emissions, no longer applies in Bexar County once Bexar County is required to comply with the VOC requirements beginning on January 1, 2025.

§115.911 Criteria for Approval of Alternate Means of Control Plans

The commission adopts the addition of a reference to the definitions in §115.10 after each specific ozone nonattainment area reference in §115.911(3) for clarification purposes. The commission adopts the increase of the appropriate applicable emission reduction factor in §115.911(3)(B) to 1.3, since the Dallas-Fort Worth area has been reclassified as severe nonattainment for ozone under the 2008 standard. The commission adopts the renumbering of existing §115.911(3)(E) as §115.911(3)(F) and inserts a new §115.911(3)(E) provision that specifies the appropriate Bexar County area 1.15 emission reduction factor for a moderate ozone nonattainment area.

Final Regulatory Impact Determination

The commission reviewed the rule adoption in light of the regulatory impact analysis requirements of Texas Government Code, §2001.0225, and determined that the rule adoption does not meet the definition of a major environmental rule as defined in that statute, and in addition, if it did meet the definition, will not be subject to the requirement to prepare a regulatory impact analysis. A major environmental rule means a rule, the specific intent of which is to protect the environment or reduce risks to human health from environmental exposure, and that may adversely affect in a material way the economy, a sector of the economy, productivity, competition, jobs, the environment, or the public health and safety of the state or a sector of the state. Additionally, the rule adoption does not meet any of the four applicability criteria for requiring a regulatory impact analysis for a major environmental rule, which are listed in Tex. Gov't Code Ann., §2001.0225(a). Section 2001.0225 of the Texas Government Code applies only to a major environmental rule, the result of which is to: 1) exceed a standard set by federal law, unless the rule is specifically required by state law; 2) exceed an express requirement of state law, unless the rule is specifically required by federal law; 3) exceed a requirement of a delegation agreement or contract between the state and an agency or representative of the federal government to implement a state and federal program; or 4) adopt a rule solely under the general powers of the agency instead of under a specific state law.

The specific intent of these adopted rules is to comply with federal requirements for the implementation of control strategies necessary to attain and maintain the National Ambient Air Quality Standards (NAAQS) for ozone mandated by 42 United States Code (USC), 7410, Federal Clean Air Act (FCAA), §110, and required to be included in operating permits by 42 USC, §7661a, FCAA, §502, as specified elsewhere in this preamble. The adopted rule addresses contingency measure requirements for the DFW and HGB 2008 eight-hour ozone nonattainment areas, RACT requirements for the Bexar County 2015 eight-hour ozone nonattainment area, and clarifications to rules previously adopted to address EPA's 2016 control techniques guidelines for oil and gas sources, as discussed elsewhere in this preamble. States are required to adopt State Implementation Plans (SIPs) with enforceable emission limitations and other control measures, means, or techniques, as well as schedules and timetables for compliance, as may be necessary or appropriate to meet the applicable requirements of the FCAA. As discussed in the FISCAL NOTE portion of the preamble to the proposed rulemaking associated with this adopted rulemaking action, the adopted rules are not anticipated to add any significant additional costs to affected individuals or businesses, beyond what is necessary to attain the ozone NAAQS, on the economy, a sector of the economy, productivity, competition, jobs, the environment, or the public health and safety of the state or a sector of the state.

If a state does not comply with its obligations under 42 USC, §7410, FCAA, §110 to submit SIPs, states are subject to discretionary sanctions under 42 USC, §7410(m) or mandatory sanctions under 42 USC, §7509, FCAA, §179; as well as the imposition of a federal implementation plan (FIP) under 42 USC, §7410, FCAA, §110I. Under 42 USC, §7661a, FCAA, §502, states are required to have federal operating permit programs that provide authority to issue permits and assure compliance with each applicable standard, regulation, or requirement under the FCAA, including enforceable emission limitations and other control measures, means, or techniques, which are required under 42 USC, §7410, FCAA, §110. Similar to requirements in 42 USC, §7410, FCAA, §110, states are not free to ignore requirements in 42 USC, §7661a, FCAA, §502 and must develop and submit programs to provide for operating permits for major sources that include all applicable requirements of the FCAA. Lastly, states are also subject to the imposition of sanctions under 42 USC, §7661a(d) and (i), FCAA, §502(d) and (i) for failure to submit an operating permits program, the disapproval of any operating permits program, or failure to adequately administer and enforce the approved operating permits program.

The requirement to provide a fiscal analysis of regulations in the Texas Government Code was amended by Senate Bill (SB) 633 during the 75th legislative session in 1997. The intent of SB 633 was to require agencies to conduct a regulatory impact analysis of extraordinary rules. These are identified in the statutory language as major environmental rules that will have a material adverse impact and will exceed a requirement of state law, federal law, or a delegated federal program, or are adopted solely under the general powers of the agency. With the understanding that this requirement would seldom apply, the commission provided a cost estimate for SB 633 that concluded "based on an assessment of rules adopted by the agency in the past, it is not anticipated that the bill will have significant fiscal implications for the agency due to its limited application." The commission also noted that the number of rules that would require assessment under the provisions of the bill was not large. This conclusion was based, in part, on the criteria set forth in the bill that exempted rules from the full analysis unless the rule was a major environmental rule that exceeds a federal law. Because of the ongoing need to meet federal requirements, the commission routinely proposes and adopts rules incorporating or designed to satisfy specific federal requirements. The legislature is presumed to understand this federal scheme. If each rule proposed by the commission to meet a federal requirement was considered to be a major environmental rule that exceeds federal law, then each of those rules would require the full regulatory impact analysis (RIA) contemplated by SB 633. Requiring a full RIA for all federally required rules is inconsistent with the conclusions reached by the commission in its cost estimate and by the Legislative Budget Board (LBB) in its fiscal notes. Since the legislature is presumed to understand the fiscal impacts of the bills it passes, and that presumption is based on information provided by state agencies and the LBB, the that the intent of SB 633 was only to require the full RIA for rules that are extraordinary in nature. While the adopted rules may have a broad impact, that impact is no greater than is necessary or appropriate to meet the requirements of the FCAA, and in fact creates no additional impacts since the adopted rules do not impose burdens greater than required to demonstrate attainment of the ozone NAAQS as discussed elsewhere in this preamble. For these reasons, the adopted rules fall under the exception in Texas Government Code, §2001.0225(a), because they are required by, and do not exceed, federal law.

The commission has consistently applied this construction to its rules since this statute was enacted in 1997. Since that time, the legislature has revised the Texas Government Code, but left this provision substantially unamended. It is presumed that "when an agency interpretation is in effect at the time the legislature amends the laws without making substantial change in the statute, the legislature is deemed to have accepted the agency's interpretation." (Central Power & Light Co. v. Sharp, 919 S.W.2d 485, 4 89 (Tex. App. Austin 1995), writ denied with per curiam opinion respecting another issue, 960 S.W.2d 617 (Tex. 1997); Bullock v. Marathon Oil Co., 798 S.W.2d 353, 357 (Tex. App. Austin 1990, no writ). Cf. Humble Oil & Refining Co. v. Calvert, 414 S.W.2d 172 (Tex. 1967); Dudney v. State Farm Mut. Auto Ins. Co., 9 S.W.3d 884, 893 (Tex. App. Austin 2000); Southwestern Life Ins. Co. v. Montemayor, 24 S.W.3d 581 (Tex. App. Austin 2000, pet. denied); and Coastal Indust. Water Auth. v. Trinity Portland Cement Div., 563 S.W.2d 916 (Tex. 1978).) The commission's interpretation of the RIA requirements is also supported by a change made to the Texas Administrative Procedure Act (APA) by the legislature in 1999. In an attempt to limit the number of rule challenges based upon APA requirements, the legislature clarified that state agencies are required to meet these sections of the APA against the standard of "substantial compliance" (Texas Government Code, §2001.035). The legislature specifically identified Texas Government Code, §2001.0225 as falling under this standard.

As discussed in this analysis and elsewhere in this preamble, the commission has substantially complied with the requirements of Texas Government Code, §2001.0225. The adopted rules implement the requirements of the FCAA as discussed in this analysis and elsewhere in this preamble. The adopted rules were determined to be necessary to attain the ozone NAAQS and are required to be included in permits under 42 USC, §7661a, FCAA, §502, and will not exceed any standard set by state or federal law. These adopted rules are not an express requirement of state law. The adopted rules do not exceed a requirement of a delegation agreement or a contract between state and federal government, as the adopted rules, if approved by EPA, will become federal law as part of the approved SIP required by 42 U.S.C. §7410, FCAA, §110. The adopted rules were not developed solely under the general powers of the agency but are authorized by specific sections of Texas Health and Safety Code, Chapter 382 (also known as the Texas Clean Air Act), and the Texas Water Code, which are cited in the STATUTORY AUTHORITY section of this preamble, including Texas Health and Safety Code, §§382.011, 382.012, and 382.017. Therefore, this adopted rulemaking action is not subject to the regulatory analysis provisions of Texas Government Code, §2001.0225(b).

The commission invited public comment regarding the draft regulatory impact analysis determination during the public comment period. No comments were received regarding the regulatory impact analysis determination.

Takings Impact Assessment

Under Texas Government Code, §2007.002(5), taking means a governmental action that affects private real property, in whole or in part or temporarily or permanently, in a manner that requires the governmental entity to compensate the private real property owner as provided by the Fifth and Fourteenth Amendments to the United States Constitution or §17 or §19, Article I, Texas Constitution; or a governmental action that affects an owner's private real property that is the subject of the governmental action, in whole or in part or temporarily or permanently, in a manner that restricts or limits the owner's right to the property that would otherwise exist in the absence of the governmental action; and is the producing cause of a reduction of at least 25 percent in the market value of the affected private real property, determined by comparing the market value of the property as if the governmental action is not in effect and the market value of the property determined as if the governmental action is in effect. The commission completed a takings impact analysis for the adopted rulemaking action under the Texas Government Code, §2007.043.

The primary purpose of this adopted rulemaking action, as discussed elsewhere in this preamble, is to meet federal requirements for the implementation of control strategies necessary to attain and maintain the National Ambient Air Quality Standards (NAAQS) for ozone mandated by 42 United States Code (USC), 7410, Federal Clean Air Act (FCAA), §110, and required to be included in operating permits by 42 USC, §7661a, FCAA, §502. The adopted rule addresses contingency measure requirements for the DFW and HGB 2008 eight-hour ozone nonattainment areas, RACT requirements for the Bexar County 2015 eight-hour ozone nonattainment area, and clarifications to rules previously adopted to address EPA's 2016 control techniques guidelines for oil and gas sources, as discussed elsewhere in this preamble.

States are required to adopt State Implementation Plans (SIPs) with enforceable emission limitations and other control measures, means, or techniques, as well as schedules and timetables for compliance, as may be necessary or appropriate to meet the applicable requirements of the FCAA. If a state does not comply with its obligations under 42 USC, §7410, FCAA, §110 to submit SIPs, states are subject to discretionary sanctions under 42 USC, §7410(m) or mandatory sanctions under 42 USC, §7509, FCAA, §179; as well as the imposition of a FIP under 42 USC, §7410, FCAA, §110(c). Under 42 USC, §7661a, FCAA, §502, states are required to have federal operating permit programs that provide authority to issue permits and assure compliance with each applicable standard, regulation, or requirement under the FCAA, including enforceable emission limitations and other control measures, means, or techniques, which are required under 42 USC, §7410, FCAA, §110. Similar to requirements in 42 USC, §7410, FCAA, §110, regarding the requirement to adopt and implement plans to attain and maintain the national ambient air quality standards, states are not free to ignore requirements in 42 USC, §7661a, FCAA, §502 and must develop and submit programs to provide for operating permits for major sources that include all applicable requirements of the FCAA. Lastly, states are also subject to the imposition of sanctions under 42 USC, §7661a(d) and (i), FCAA, §502(d) and (i) for failure to submit an operating permits program, the disapproval of any operating permits program, or failure to adequately administer and enforce the approved operating permits program.

The adopted rules will not create any additional burden on private real property beyond what is required under federal law, as the rules, when adopted by the commission and approved by EPA, will become federal law as part of the approved SIP required by 42 U.S.C. §7410, FCAA, §110. The adopted rules will not affect private real property in a manner that will require compensation to private real property owners under the United States Constitution or the Texas Constitution. The adoption also will not affect private real property in a manner that restricts or limits an owner's right to the property that will otherwise exist in the absence of the governmental action. Therefore, the adopted rulemaking will not cause a taking under Texas Government Code, Chapter 2007.

Consistency with the Coastal Management Program

The commission reviewed the adopted rulemaking and found that the adoption is subject to the Texas Coastal Management Program (CMP) in accordance with the Coastal Coordination Act, Texas Natural Resources Code, §§33.201 et seq., and therefore must be consistent with all applicable CMP goals and policies. The commission conducted a consistency determination for the adopted rules in accordance with Coastal Coordination Act Implementation Rules, 31 TAC §505.22 and found the adopted rulemaking is consistent with the applicable CMP goals and policies. The CMP goal applicable to the adopted rulemaking is the goal to protect, preserve, and enhance the diversity, quality, quantity, functions, and values of coastal natural resource areas (31 TAC §501.12(l)). The CMP policy applicable to the adopted rulemaking is the policy that commission rules comply with federal regulations in 40 CFR, to protect and enhance air quality in the coastal areas (31 TAC §501.32). The adopted rulemaking will not increase emissions of air pollutants and is therefore consistent with the CMP goal in 31 TAC §501.12(1) and the CMP policy in 31 TAC §501.32. Promulgation and enforcement of these rules will not violate or exceed any standards identified in the applicable CMP goals and policies because the adopted rules are consistent with these CMP goals and policies and because these rules do not create or have a direct or significant adverse effect on any coastal natural resource areas. Therefore, in accordance with 31 TAC §505.22(e), the commission affirms that this rulemaking action is consistent with CMP goals and policies.

The commission invited public comment regarding the consistency with the coastal management program during the public comment period. No comments were received regarding the CMP.

Effect on Sites Subject to the Federal Operating Permits Program

Chapter 115 is an applicable requirement under 30 TAC Chapter 122, Federal Operating Permits Program. Once adopted, owners or operators of affected sites subject to the federal operating permit program must, consistent with the revision process in Chapter 122, upon the effective date of the rulemaking, revise their operating permit to include the new Chapter 115 requirements.

Public Comment

The commission held a public hearing on January 4, 2024, in Houston and a public hearing on January 11, 2024, in Arlington. A hearing was also offered on January 9, 2024, in San Antonio. The comment period opened on December 1, 2023, and closed on January 16, 2024. The commission received comments from Baker Botts LLP (Baker Botts) on behalf of their clients in the Dallas Fort Worth ozone nonattainment area, Environmental Protection Agency (EPA) Region 6, Green Environmental Consulting, Inc, North Central Texas Council of Governments (NCTCOG), Office of the Harris County Attorney, the Texas Pipeline Association (TPA), and one individual. Two commenters were in support of the proposed rulemaking action. Two commenters were against portions of the proposed rulemaking action concerning adequacy, timing and implementation of contingency measures. Five commenters provided suggested changes concerning the correction of errors in or clarification of definitions and exemptions, revisions to proposed rules to make them consistent with the CTG or align TCEQ rules with federal rules, and revisions to allow more flexibility for fugitive monitoring with new technologies.

Response to Comments

Comment: Baker Botts commented that the 30 TAC §115.171(9)(B) definition of pneumatic controllers contained an error and should be revised in accordance with EPA's 2016 CTG guidance to specify that intermittent pneumatic controller emissions are not subject to 30 TAC §115.174(b) standards. Baker Botts proposed revisions to the 30 TAC §115.171(9)(B) intermittent pneumatic controller definition that would accomplish this objective.

Response: The commission reviewed the existing description for intermittent bleed or snap-acting pneumatic controller in 30 TAC §115.171(9)(B) as well as EPA's 2016 Oil and Natural Gas Industry CTG guidance. Based on review of the CTG and EPA's guidance and recommendations, TCEQ concluded that the CTG did not intend for intermittent pneumatic controller VOC emissions from required control valve activation activities to be considered when evaluating compliance for pneumatic pumps or pneumatic controllers at locations other than a natural gas processing plant. EPA's guidance recommends a bleed rate limit applies to continuous bleed pneumatic controllers, and EPA's guidance explains that intermittent controllers are assumed to have zero bleed emission due to how these controllers function. These intermittent controllers do not have a continuous flow of natural gas, only emitting VOC during intermittent actuation, thus there is no continuous bleeding of natural gas. To ensure consistency with the CTG and EPA guidance, the commission amends the description of an intermittent bleed or snap-acting pneumatic controller in 30 TAC §115.171(9)(B) and adds a provision clarifying that these devices are not subject to the bleed rate limits in 30 TAC §115.174(b)(2).

Comment: Baker Botts commented that TCEQ should authorize more fugitive monitoring technology flexibility in Oil and Natural Gas Industry CTG regulations in order to take advantage of improvements in fugitive monitoring technology. Baker Botts proposed alternative fugitive monitoring methodology language that would authorize substituting New Source Performance Standard (NSPS) OOOOb or other TCEQ approved alternative fugitive monitoring methodologies and frequencies in place of current 30 TAC §115.177(b) provisions.

Response: The commission reviewed EPA's 2016 oil and gas CTG to determine if it contained provisions to authorize alternative fugitive monitoring methodology or frequencies in addition to those in current 30 TAC §115.177(b) or §115.358. TCEQ did not locate recommendations for fugitive monitoring technologies or frequencies to satisfy fugitive monitoring requirements other than those already authorized under current 30 TAC §115.177(b) or §115.358. The commission notes that the CTG recommends either optical gas imaging (OGI) or Method 21 fugitive monitoring be performed to satisfy affected monitoring requirements at well site and boosting and gathering stations. No changes were made to the rule in response to this comment.

Comment: TPA commented that current rule fugitive monitoring requirements go beyond CTG recommendations and should not apply to well sites and gathering and boosting stations due to the undue burden they impose on small and unmanned facilities. TPA further requested that TCEQ limit fugitive monitoring requirements to CTG recommendations and allow OGI technology to be used to satisfy all monitoring activities. TPA commented that by expanding fugitive monitoring requirement applicability to encompass well sites and gathering and boosting stations and by lowering the major source threshold, additional sites previously not subject will become subject to §115.177.

Response: The commission has no control over the major source threshold, which is stipulated in the federal Clean Air Act and cannot be changed. Only sites intended to be regulated according to the CTG are being regulated under the current TCEQ Chapter 115 rules. The well site and gathering and boosting station fugitive monitoring requirements are derived from pages 9-40 and 9-41 of the CTG recommendations. As provided in existing 30 TAC §115.177(b)(11)(C), the commission already allows an OGI fugitive monitoring option that may be employed for all monitoring activities at well sites and gathering and boosting stations because §115.177(b)(11)(C) does not require annual Method 21 monitoring at well sites or gathering and boosting stations. No changes were made to the rule in response to this comment.

Comment: TPA raised a concern about the clarity of exemptions in §115.172(e) and (f), as well as other §115.172 provisions. TPA commented that current §115.172 exemptions have overly broad and unclear references that make them difficult to be fully understood. TPA requested that §115.172 exemptions list each individual citation from which an affected owner is exempt using section and subsection references to avoid ambiguity.

Response: The exemptions in §115.172(e) and (f) apply to wellhead only sites and pressure relief valves vented to a closed-vent-system and control device components, respectively, which would otherwise be subject to §115.177(b). In response to this comment, the commission revised proposed §115.172(e) and (f) to specify that sites or components are only exempt from the monitoring requirements in §115.177(b), the provision in §115.177 that contains actual fugitive monitoring requirements. Section 115.177(a) provisions require a monitoring plan that must include a list of exemptions. Section 115.177(a) is not covered by the §115.172 exemption provisions. TCEQ has chosen to specify the exemption at the subsection level which includes all rule elements within the subsection rather than each individual citation as requested. This is standard TCEQ rule writing practice. No other changes were made in response to this comment.

Comment: Green Environmental Consulting, Inc. recommended a revision to the proposed new definition for "Industrial Maintenance Coating" in §115.450(c)(3) to clarify that it only applies to stationary structures and does not include materials or associated activities that meet the definition of "Miscellaneous Metal Parts and Coatings".

Response: TCEQ agrees with the recommendation and, in response to this comment, updated the §115.450(c)(3) definition to clarify that "Industrial Maintenance Coatings" only applies to stationary structures and does not apply to surface coating of items that meet the definition of "Miscellaneous Metal Parts and Products". The proposed definition listed various stationary structures without explicitly describing them as stationary and did not describe coating of items meeting the definition of "Miscellaneous Metal Parts and Products". Explicitly including this phrasing is acceptable.

Comment: Green Environmental Consulting, Inc. recommended that the commission adjust the proposed VOC limit for industrial maintenance coatings to the EPA's 3.8 lb VOC/gal limit cited in 40 CFR §59.402 Subpart D, Table 1. The commenter indicated that the commission's limit of 2.1 lb of VOC/gal would be exceedingly difficult to attain given the availability of coatings with VOC concentrations below this limit. In addition, it was stated that the coatings below the proposed limit are not sufficiently capable of performing their functions under extreme conditions.

Response: TCEQ's research on surface coatings provides evidence that the proposed VOC limit is attainable. Similar limits have been established in other states, including Maryland and New York, where manufacturers have been able to meet the proposed VOC limit for surface coatings. No changes were made to the rule in response to this comment.

Comment: The Office of the Harris County Attorney commented that the six proposed VOC contingency measures are insignificant, not sufficient to enable the DFW and/or HGB 2008 ozone nonattainment areas to demonstrate RFP or attain the 2008 ozone NAAQS and only sufficient to fulfill the federal Clean Air Act requirement to include contingency measures in an AD SIP revision. They additionally requested that since the proposed contingency measures do not conform to EPA guidance, they should be revised to be more effective.

Response: The commission disagrees that the proposed contingency measures require revision. The measures conform to EPA's 2008 eight-hour ozone standard SIP requirements rule, which requires measures to achieve sufficient VOC reductions to meet the calculated target amount. The 2008 eight-hour ozone standard SIP requirements rule sets the emission reduction amount at a level that EPA claims is sufficient to assist progress toward attainment, which fulfills the FCAA requirement for contingency measures. The 2008 eight-hour ozone standard SIP requirements rule does not require contingency measures to be sufficient for a nonattainment area to attain the NAAQS, but rather to assist progress toward attainment. Control measures designed to accomplish attainment are addressed in attainment demonstration SIP revisions. See the concurrent DFW AD SIP Revision (2023-107-SIP-NR) and HGB AD SIP Revision (2023-110-SIP-NR) for discussion of the need for such measures. Staff inadvertently omitted some source categories and incorrectly stated multiple VOC content limits for other source categories in the industrial adhesives contingency measure rule proposal. This resulted in less emissions reductions available to fulfill contingency requirements in the DFW and HGB areas. The Executive Director intends to immediately initiate rulemaking for commission consideration to restore the missing and incorrect VOC content limits to achieve the reductions originally intended. No changes were made to the rule in response to this comment.

Comment: The Office of the Harris County Attorney commented regarding the timeframe and scope of TCEQ contingency measures. The commentor also stated that after EPA publishes a notice of finding of failure to attain or meeting RFP in the Federal Register, TCEQ must publish a notice in the Texas Register stating that compliance with contingency measures is required. The Office of the Harris County Attorney also noted that TCEQ's proposed rules require compliance with these contingency measures no more than nine months after the Texas Register publication, whereas new EPA guidance, published in March 2023, recommends contingency measure implementation within 60 days of EPA's publication. The Office of the Harris County Attorney also requested that the rules be revised to align with EPA's guidance and the intended purpose of contingency measures.

Response: EPA's draft guidance states "actions needed to affect full implementation" of the contingency measures should occur within 60 days of EPA notification of failure to attain. However, EPA states that one year is generally an appropriate timeframe for contingency measures to achieve emission reductions. Contingency measures are intended to bridge the gap between failure to attain or meet an RFP milestone and subsequent corrective action, and 60 days is suggested as a timeline for completion of appropriate administrative and supportive components of a contingency measure. Publication in the Texas Register is intended to meet EPA's 60 day requirement to take action to affect full implementation, and the 270 day compliance period is intended to comply with EPA guidance to assure that reductions occur within one year. No changes were made to the rule in response to this comment.

Comment: TPA recommended that TCEQ evaluate Texas air quality regulations for consistency with new federal regulations like NSPS OOOOb and incorporate changes to CTG-recommended requirements to match other newly promulgated federal rules. TPA specifically requested that the requirement to change reciprocating compressor rod packing every three years or 26,000 operating hours, as recommended in the CTG, be revised to match NSPS OOOOb, which only requires the reciprocating compressor rod packing to be monitored after 8,760 operating hours. TPA noted that NSPS OOOOb only requires the reciprocating compressor rod packing to be changed if warranted by the inspection.

Response: The 40 CFR part 60, subpart OOOOb rule was published on March 8, 2024, after publication of this proposed Chapter 115 rulemaking to meet RACT and contingency measures requirements. TCEQ may evaluate opportunities to revise RACT requirements to more closely align with other federal requirements, where appropriate, during future rulemaking actions. No changes were made to the rule in response to this comment.

Comment: EPA commented that TCEQ's process for implementation of contingency measures within the required 60 days was unclear and requested clarification.

Response: EPA's draft contingency measure guidance states "As discussed in Section 2, in the 1992 General Preamble, EPA did address the question of how soon the for ozone should take effect, and acknowledged that certain actions, such as notification of sources, modification of permits, etc., would probably be needed before a measure could be implemented effectively. There, EPA concluded that in general, actions needed to affect full implementation of the measures should occur within 60 days after EPA notifies the State of its failure (to attain or meet RFP)."

The commission agrees in this situation that "actions needed to affect full implementation of the measures" can occur within 60 days of the EPA notice. For these contingency measures, this action would be notification to affected sources in the Texas Register that the measures have been triggered. Permit modifications are not anticipated to be required to reduce emissions by using materials with lower VOC content such as coatings, degreasing and cleaning solvents, adhesives, and emulsified asphalt because, if mentioned at all, the permit would set a maximum VOC content, not a minimum.

The draft guidance also states, "EPA continues to believe that 1 year is generally the appropriate timeframe for CMs to achieve reductions because of the intended purpose of is to provide emissions reductions to bridge the gap between the failure and the subsequent corrective action." The commission is adopting a compliance date requiring compliance with the contingency measures within 270 days after notice in the Texas Register. TCEQ chose to require compliance within 270 days rather than a year to allow time between the EPA notification and the TCEQ notification. The commission is not requiring compliance within 60 days of EPA notice for three reasons. First, the EPA notice would be of EPA's determination of failure to attain or failure to meet an RFP milestone, but a separate notice is required from TCEQ to notify affected sources regarding which contingency measures will be triggered in which nonattainment areas. The TCEQ notice requires additional time, potentially consuming a substantial portion of a 60-day period. Second, once notified, affected sources may need additional time to acquire a supply of compliant, lower VOC materials. Third, the EPA draft guidance recommends that contingency measure reductions occur within one year of EPA notification and the 270-day compliance period will allow sources sufficient time to adjust their operations while assuring that sources are achieving reductions within one year. No changes were made in response to this comment.

SUBCHAPTER A. DEFINITIONS

30 TAC §115.10

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; and THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air.

The adopted amendments implement TWC, §§5.102, 5.103, 5.105 and 7.002; and THSC, §§382.002, 382.011, 382.012, and 382.017.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401784

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

DIVISION 1. STORAGE OF VOLATILE ORGANIC COMPOUNDS

30 TAC §§115.110 - 115.112, 115.114 - 115.119

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.111.Exemptions.

(a) The following exemptions apply in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas as defined in §115.10 of this title (relating to Definitions), except as noted in paragraphs (2), (4), (6), (7), and (9) - (11) of this subsection.

(1) Except as provided in §115.118 of this title (relating to Recordkeeping Requirements), a storage tank storing volatile organic compounds (VOC) with a true vapor pressure less than 1.5 pounds per square inch absolute (psia) is exempt from the requirements of this division.

(2) A storage tank with storage capacity less than 210,000 gallons storing crude oil or condensate prior to custody transfer in the Beaumont-Port Arthur, Bexar County, or El Paso areas, is exempt from the requirements of this division. This exemption no longer applies in the Dallas-Fort Worth area beginning March 1, 2013.

(3) A storage tank with a storage capacity less than 25,000 gallons located at a motor vehicle fuel dispensing facility is exempt from the requirements of this division.

(4) A welded storage tank in the Beaumont-Port Arthur, Bexar County, El Paso, and Houston-Galveston-Brazoria areas with a mechanical shoe primary seal that has a secondary seal from the top of the shoe seal to the tank wall (a shoe-mounted secondary seal) is exempt from the requirement for retrofitting with a rim-mounted secondary seal if the shoe-mounted secondary seal was installed or scheduled for installation before August 22, 1980.

(5) An external floating roof storage tank storing waxy, high pour point crude oils is exempt from any secondary seal requirements of §115.112(a), (d), and (e) of this title (relating to Control Requirements).

(6) A welded storage tank in the Beaumont-Port Arthur, Bexar County, El Paso, and Houston-Galveston-Brazoria areas storing VOC with a true vapor pressure less than 4.0 psia is exempt from any external floating roof secondary seal requirement if any of the following types of primary seals were installed before August 22, 1980:

(A) a mechanical shoe seal;

(B) a liquid-mounted foam seal; or

(C) a liquid-mounted liquid filled type seal.

(7) A welded storage tank in the Beaumont-Port Arthur, Bexar County, El Paso, and Houston-Galveston-Brazoria areas storing crude oil with a true vapor pressure equal to or greater than 4.0 psia and less than 6.0 psia is exempt from any external floating roof secondary seal requirement if any of the following types of primary seals were installed before December 10, 1982:

(A) a mechanical shoe seal;

(B) a liquid-mounted foam seal; or

(C) a liquid-mounted liquid filled type seal.

(8) A storage tank with storage capacity less than or equal to 1,000 gallons is exempt from the requirements of this division.

(9) In the Houston-Galveston-Brazoria area, a storage tank or tank battery storing condensate, as defined in §101.1 of this title (relating to Definitions), prior to custody transfer with a condensate throughput exceeding 1,500 barrels (63,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(d)(4) or (e)(4)(A) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title (relating to Approved Test Methods), that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 25 tons per year on a rolling 12-month basis.

(10) In the Dallas-Fort Worth area, except Wise County, a storage tank or tank battery storing condensate prior to custody transfer with a condensate throughput exceeding 3,000 barrels (126,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(e)(4)(B) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 50 tons per year on a rolling 12-month basis. This exemption no longer applies on November 7, 2025.

(11) In the Dallas-Fort Worth area, except in Wise County, on or after November 7, 2025, a storage tank or tank battery storing condensate prior to custody transfer with a condensate throughput exceeding 1,500 barrels (63,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(e)(4)(B) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 25 tons per year on a rolling 12-month basis.

(12) In Wise County, prior to July 20, 2021, a storage tank or tank battery storing condensate prior to custody transfer with a condensate throughput exceeding 6,000 barrels (252,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(e)(4)(C)(i) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 100 tons per year on a rolling 12-month basis.

(13) In Wise County until November 7, 2025, , a storage tank or tank battery storing condensate prior to custody transfer with a condensate throughput exceeding 3,000 barrels (126,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(e)(4)(C)(ii) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 50 tons per year on a rolling 12-month basis.

(14) In Wise County beginning November 7, 2025, a storage tank or tank battery storing condensate prior to custody transfer with a condensate throughput exceeding 1,500 barrels (63,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(e)(4)(D) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 25 tons per year on a rolling 12-month basis.

(15) In the Bexar County area beginning January 1, 2025 a storage tank or tank battery storing condensate prior to custody transfer with a condensate throughput exceeding 6,000 barrels (252,000 gallons) per year on a rolling 12-month basis is exempt from the requirement in §115.112(e)(4)(E) of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 100 tons per year on a rolling 12-month basis. of this title, to control flashed gases if the owner or operator demonstrates, using the test methods specified in §115.117 of this title, that uncontrolled VOC emissions from the individual storage tank, or from the aggregate of storage tanks in a tank battery, are less than 100 tons per year on a rolling 12-month basis.

(16) In the Bexar County, Dallas-Fort Worth, and Houston-Galveston-Brazoria areas, beginning when compliance is achieved with Division 7 of this subchapter (relating to Oil and Natural Gas Service in Ozone Nonattainment Areas) but no later than its initial §115.183 compliance deadline, a storage tank storing crude oil or condensate that is subject to the compliance requirements of Division 7 of this subchapter is exempt from all requirements in this division.

(b) The following exemptions apply in Gregg, Nueces, and Victoria Counties.

(1) Except as provided in §115.118 of this title, a storage tank storing VOC with a true vapor pressure less than 1.5 psia is exempt from the requirements of this division.

(2) A storage tank with storage capacity less than 210,000 gallons storing crude oil or condensate prior to custody transfer is exempt from the requirements of this division.

(3) A storage tank with storage capacity less than 25,000 gallons located at a motor vehicle fuel dispensing facility is exempt from the requirements of this division.

(4) A welded storage tank with a mechanical shoe primary seal that has a secondary seal from the top of the shoe seal to the tank wall (a shoe-mounted secondary seal) is exempt from the requirement for retrofitting with a rim-mounted secondary seal if the shoe-mounted secondary seal was installed or scheduled for installation before August 22, 1980.

(5) An external floating roof storage tank storing waxy, high pour point crude oils is exempt from any secondary seal requirements of §115.112(b) of this title.

(6) A welded storage tank storing VOC with a true vapor pressure less than 4.0 psia is exempt from any external secondary seal requirement if any of the following types of primary seals were installed before August 22, 1980:

(A) a mechanical shoe seal;

(B) a liquid-mounted foam seal; or

(C) a liquid-mounted liquid filled type seal.

(7) A welded storage tank storing crude oil with a true vapor pressure equal to or greater than 4.0 psia and less than 6.0 psia is exempt from any external secondary seal requirement if any of the following types of primary seals were installed before December 10, 1982:

(A) a mechanical shoe seal;

(B) a liquid-mounted foam seal; or

(C) a liquid-mounted liquid filled type seal.

(8) A storage tank with storage capacity less than or equal to 1,000 gallons is exempt from the requirements of this division.

(c) The following exemptions apply in Aransas, Bexar, Calhoun, Matagorda, San Patricio, and Travis Counties. The exemptions in this subsection no longer apply in Bexar County beginning January 1, 2025.

(1) A storage tank storing VOC with a true vapor pressure less than 1.5 psia is exempt from the requirements of this division.

(2) Slotted guidepoles installed in a floating roof storage tank are exempt from the provisions of §115.112(c) of this title.

(3) A storage tank with storage capacity between 1,000 gallons and 25,000 gallons is exempt from the requirements of §115.112(c)(1) of this title if construction began before May 12, 1973.

(4) A storage tank with storage capacity less than or equal to 420,000 gallons is exempt from the requirements of §115.112(c)(3) of this title.

(5) A storage tank with storage capacity less than or equal to 1,000 gallons is exempt from the requirements of this division.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401785

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.121 - 115.123, 115.125 - 115.127, 115.129

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401786

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.131, 115.132, 115.135 - 115.137, 115.139

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.131.Emission Specifications.

(a) For all persons in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas as defined in §115.10 of this title (relating to Definitions), any volatile organic compound (VOC) water separator equipped with a vapor recovery system in order to comply with §115.132(a) of this title (relating to Control Requirements) shall reduce emissions such that the true partial pressure of the VOC in vent gases to the atmosphere will not exceed a level of 0.5 psia (3.4 kPa).

(b) For all persons in Gregg, Nueces, and Victoria Counties, any VOC water separator equipped with a vapor recovery system in order to comply with §115.132(b) of this title shall reduce emissions such that the partial pressure of the VOC in vent gases to the atmosphere will not exceed a level of 1.5 psia (10.3 kPa).

(c) For all persons in Aransas, Bexar, Calhoun, Matagorda, San Patricio, and Travis Counties, any VOC water separator equipped with a vapor recovery system in order to comply with §115.132(c) of this title shall reduce emissions such that the true partial pressure of the VOC in vent gases to the atmosphere will not exceed a level of 1.5 psia (10.3 kPa). The emission specifications of this subsection no longer apply for sources located in Bexar County beginning January 1, 2025.

§115.132.Control Requirements.

(a) For the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, no person shall use any single or multiple compartment volatile organic compound (VOC) water separator which separates materials containing VOC obtained from any equipment which is processing, refining, treating, storing, or handling VOC, unless each compartment is controlled in one of the following ways:

(1) the compartment totally encloses the liquid contents and has all openings (such as roof seals and access doors) sealed such that the separator can hold a vacuum or pressure without emissions to the atmosphere, except through a pressure relief valve. All gauging and sampling devices shall be vapor-tight except during gauging or sampling. The pressure relief valve must be designed to open only as necessary to allow proper operation, and must be set at the maximum possible pressure necessary for proper operation, but such that the valve will not vent continuously;

(2) the compartment is equipped with a floating roof or internal floating cover which will rest on the surface of the contents and be equipped with a closure seal or seals to close the space between the roof edge and tank wall. All gauging and sampling devices shall be vapor-tight except during gauging or sampling;

(3) the compartment is equipped with a vapor recovery system which satisfies the provisions of §115.131(a) of this title (relating to Emission Specifications);

(4) any water separator that becomes subject to the provisions of paragraph (1), (2), or (3) of this subsection by exceeding provisions of §115.137(a) of this title (relating to Exemptions) will remain subject to the provisions of this subsection, even if throughput or emissions later fall below the exemption limits unless and until emissions are reduced to no more than the controlled emissions level existing before implementation of the project by which throughput or emission rate was reduced to less than the applicable exemption limits in §115.137(a) of this title; and

(A) the project by which throughput or emission rate was reduced is authorized by any permit or permit amendment or standard permit or permit by rule required by Chapter 116 or Chapter 106 of this title (relating to Control of Air Pollution by Permits for New Construction or Modification; and Permits by Rule). If a permit by rule is available for the project, compliance with this subsection must be maintained for 30 days after the filing of documentation of compliance with that permit by rule; or

(B) if authorization by permit, permit amendment, standard permit, or permit by rule is not required for the project, the owner/operator has given the executive director 30 days' notice of the project in writing.

(b) For Gregg, Nueces, and Victoria Counties, no person shall use any single or multiple compartment VOC water separator which separates materials containing VOC obtained from any equipment which is processing, refining, treating, storing, or handling VOC, unless each compartment is controlled in one of the following ways:

(1) the compartment totally encloses the liquid contents and has all openings (such as roof seals and access doors) sealed such that the separator can hold a vacuum or pressure without emissions to the atmosphere, except through a pressure relief valve. All gauging and sampling devices shall be vapor-tight except during gauging or sampling. The pressure relief valve must be designed to open only as necessary to allow proper operation, and must be set at the maximum possible pressure necessary for proper operation, but such that the valve will not vent continuously;

(2) the compartment is equipped with a floating roof or internal floating cover which will rest on the surface of the contents and be equipped with a closure seal or seals to close the space between the roof or cover edge and tank wall. All gauging and sampling devices shall be vapor-tight, except during gauging or sampling;

(3) the compartment is equipped with a vapor recovery system which satisfies the provisions of §115.131(b) of this title.

(c) For Aransas, Bexar, Calhoun, Matagorda, San Patricio, and Travis Counties, no person shall use any single or multiple compartment VOC water separator which separates materials containing VOC obtained from any equipment which is processing, refining, treating, storing, or handling VOC, unless each compartment is controlled in one of the following ways. The control requirements of this subsection no longer apply for sources located in Bexar County beginning January 1, 2025.

(1) The compartment totally encloses the liquid contents and has all openings (such as roof seals and access doors) sealed such that the separator can hold a vacuum or pressure without emissions to the atmosphere, except through a pressure relief valve. All gauging and sampling devices shall be vapor-tight except during gauging or sampling. The pressure relief valve must be designed to open only as necessary to allow proper operation, and must be set at the maximum possible pressure necessary for proper operation, but such that the valve will not vent continuously.

(2) The compartment is equipped with a floating roof or internal floating cover which will rest on the surface of the contents and be equipped with a closure seal or seals to close the space between the roof or cover edge and tank wall. All gauging and sampling devices shall be vapor-tight except during gauging or sampling.

(3) The compartment is equipped with a vapor recovery system which satisfies the provisions of §115.131(c) of this title.

§115.139.Counties and Compliance Schedules.

(a) Except as specified in subsection (e) of this section, in Aransas, Bexar, Brazoria, Calhoun, Chambers, Collin, Dallas, Denton, El Paso, Fort Bend, Galveston, Gregg, Hardin, Harris, Jefferson, Liberty, Matagorda, Montgomery, Nueces, Orange, San Patricio, Tarrant, Travis, Victoria, and Waller Counties, the compliance date has passed and the owner or operator of each volatile organic compound (VOC) water separator shall continue to comply with this division.

(b) The owner or operator of each VOC water separator in Ellis, Johnson, Kaufman, Parker, and Rockwall Counties shall comply with this division as soon as practicable, but no later than March 1, 2009.

(c) The owner or operator of each VOC water separator in Wise County shall comply with this division as soon as practicable, but no later than January 1, 2017.

(d) The owner or operator of a water separator in Bexar, Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties that becomes subject to this division on or after the applicable compliance date in subsection (a), (b) or (c) of this section, shall be in compliance with the requirements in this division as soon as practicable, but no later than 60 days after becoming subject.

(e) The owner or operator of each VOC water separator in the Bexar County area subject to the requirements of this division shall comply with the requirements of §115.131(c), §115.132(c), and §115.137(c) of this title (relating to Emission Specifications; Control Requirements; and Exemptions) through December 31, 2024 and all other applicable requirements of this division by no later than January 1, 2025.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401787

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.142, 115.144, 115.146, 115.147, 115.149

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401788

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.161, 115.162, 115.164 - 115.167, 115.169

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401789

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.170 - 115.173, 115.177, 115.183

Statutory Authority

The new and amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The new and amended rules are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The new and amended adopted rules implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.171.Definitions.

Unless specifically defined in the Texas Clean Air Act (Texas Health and Safety Code, Chapter 382) or in §§3.2, 101.1, or 115.10 of this title (relating to Definitions, respectively), the terms in this division have the meanings commonly used in the field of air pollution control. The following meanings apply in this division unless the context clearly indicates otherwise.

(1) Centrifugal compressor--A piece of equipment for raising the pressure of natural gas by drawing in low-pressure natural gas and discharging significantly higher-pressure natural gas by means of mechanical rotating vanes or impellers. Screw, sliding vane, and liquid ring compressors are not centrifugal compressors.

(2) Closure device--A piece of equipment that covers an opening in the roof of a fixed roof storage tank and either can be temporarily opened or has a component that provides a temporary opening. Examples of closure devices include, but are not limited to, thief hatches, pressure relief valves, pressure-vacuum relief valves, and access hatches.

(3) Difficult-to-monitor--Equipment that cannot be inspected without elevating the inspecting personnel more than two meters above a support surface.

(4) Fugitive emission components--Except for vents as defined in §101.1 of this title (relating to Definitions) and sampling systems, equipment as defined in subparagraphs (A) and (B) of this paragraph that has the potential to leak volatile organic compounds (VOC) emissions.

(A) At a natural gas processing plant, equipment considered fugitive components include, but are not limited to, any pump, pressure relief device, open-ended valve or line, valve, flange, or other connector that is in VOC service or wet gas service, and any closed vent system or control device not subject to another section in this division that specifies one or more instrument monitoring requirements for the system or device. A compressor or sampling connection system that is exempt from the fugitive monitoring requirements in §115.352 and §115.354 of this title (relating to Fugitive Emission Control in Petroleum Refining, Natural Gas/Gasoline Processing, and Petrochemical Processes in Ozone Nonattainment Areas) on or before December 31, 2022 is excluded as a fugitive monitoring component under this subparagraph.

(B) At a well site or gathering and boosting station from equipment considered fugitive emissions components include, but are not limited to, valves, compressors, connectors, pressure relief devices, open-ended lines, flanges, instruments, meters, or other openings that are not on a storage tank subject to §115.175 of this title (relating to Storage Tank Control Requirements), and any closed vent system or control device not subject to another section in this division that specifies one or more instrument monitoring requirements for the system or device. A compressor seal at a gathering and boosting station that is addressed in §115.173 of this title (relating to Compressor Control Requirements) is not included as a fugitive emission component.

(5) Gathering and boosting station--Any permanent combination of one or more compressors that collects natural gas from well sites and moves the natural gas at increased pressure into gathering pipelines to a natural gas processing plant or into the pipeline. The combination of one or more compressors located at a well site, or located at an onshore natural gas processing plant, is not a gathering and boosting station.

(6) Heavy liquid service--Equipment is in heavy liquid service if the heavy liquid process fluid contains VOC having a true vapor pressure equal to or less than 0.044 pounds per square inch absolute (psia) (0.3 kiloPascals) at 68 degrees Fahrenheit (20 degrees Celsius).

(7) Light liquid service--A piece of equipment contains a liquid that meets the following conditions.

(A) The vapor pressure of one or more of the organic components is greater than 1.2 inches water at 68 degrees Fahrenheit (0.3 kiloPascals at 20 degrees Celsius).

(B) The total concentration of the pure organic components having a vapor pressure greater than 1.2 inches water at 68 degrees Fahrenheit (0.3 kiloPascals at 20 degrees Celsius) is equal to or greater than 20.0% by weight.

(C) The fluid is a liquid at operating conditions.

(D) An equipment is in light liquid service if the weight percent evaporated is greater than 10.0% at 302 degrees Fahrenheit (150 degrees Celsius) as determined by ASTM Method D86-96.

(8) Natural gas processing plant--any processing site engaged in the extraction of natural gas liquids from field gas, fractionation of mixed natural gas liquids to natural gas products, or both. A Joule-Thompson valve, a dew point depression valve, or an isolated or standalone Joule-Thompson skid is not a natural gas processing plant.

(9) Pneumatic controller--An automated instrument that is actuated by a compressed gas and is used to maintain a process condition such as liquid level, pressure, pressure differential and temperature. When actuated by natural gas, pneumatic controllers are characterized primarily by their emission characteristics.

(A) Continuous bleed pneumatic controllers receive a continuous flow of pneumatic natural gas supply and are used to modulate flow, liquid level, or pressure. Gas is vented continuously at a rate that may vary over time. Continuous bleed controllers are further subdivided into two types based on their bleed rate, which for the purposes of this section means the rate at which natural gas is continuously vented from a pneumatic controller and measured in standard cubic feet per hour (scfh):

(i) low bleed controllers have a bleed rate of less than or equal to 6.0 scfh; and

(ii) high bleed controllers have a bleed rate of greater than 6.0 scfh.

(B) Intermittent bleed or snap-acting pneumatic controllers release natural gas intermittently only during control system actuation periods when they open, close, or throttle the gas flow to a control valve for actuation purposes. Intermittent bleed or snap-acting pneumatic controllers, as defined in this section, are not subject to 30 TAC §115.174(b)(2) bleed rate limits measured in scfh.

(C) Zero-bleed pneumatic controllers do not bleed natural gas to the atmosphere. These pneumatic controllers are self-contained devices that release gas to a downstream pipeline instead of to the atmosphere.

(10) Pneumatic pump--A positive displacement pump powered by pressurized natural gas that uses the reciprocating action of flexible diaphragms in conjunction with check valves to pump a fluid.

(11) Reciprocating compressor--A piece of equipment that increases the pressure of a natural gas by positive displacement, employing linear movement of the driveshaft.

(12) Rod packing--A series of flexible rings in machined metal cups that fit around the reciprocating compressor piston rod to create a seal limiting the amount of compressed natural gas that escapes to the atmosphere, or other mechanism that provides the same function.

(13) Route to a process--The emissions are:

(A) conveyed via a closed vent system to any enclosed portion of a process where it is predominantly recycled or consumed in the same manner as a material that fulfills the same function in the process or is transformed by chemical reaction into materials that are not regulated materials or incorporated into a product; or

(B) recovered.

(14) Storage tank--A tank, stationary vessel, or a container that contains an accumulation of crude oil, condensate, intermediate hydrocarbon liquids, or produced water, and that is constructed primarily of non-earthen materials.

(15) Unsafe-to-monitor--Equipment that exposes monitoring personnel to an imminent or potential danger as a consequence of conducting an inspection.

(16) Vapor recovery unit--A device that transfers hydrocarbon vapors to a fuel liquid or gas system, a sales liquid or gas system, or a liquid storage tank.

(17) Wellhead--the piping, casing, tubing and connected valves protruding above the earth's surface for an oil and/or natural gas well. The wellhead ends where the flow line connects to a wellhead valve. The wellhead does not include other equipment at the well site except for any conveyance through which gas is vented to the atmosphere.

(18) Well site--A parcel of land with one or more surface sites, which means sites with any combination of one or more graded pad sites, gravel pad sites, foundations, platforms, or the immediate physical location upon which equipment is physically affixed, that are constructed for the drilling and subsequent operation of one or more oil, natural gas, or injection wells. The meaning of "site" and "sites" in this definition is limited to this division.

(19) Wet gas service--A piece of equipment which contains or contacts the field gas before the extraction step at a gas processing plant process unit.

§115.172.Exemptions.

(a) The following exemptions apply to the equipment specified in §115.170 of this title (relating to Applicability) that is subject to this division. Records to support exemption qualification must be kept in accordance with the requirements in §115.180 of this title (relating to Recordkeeping Requirements). Additional requirements apply where specified.

(1) Boilers and process heaters are exempt from the testing requirements of §115.179 of this title (relating to Approved Test Methods and Testing Requirements) and the monitoring requirements of §115.178 of this title (relating to Monitoring and Inspection Requirements) if:

(A) a vent gas stream from equipment subject to this division is introduced with the primary fuel or is used as the primary fuel; or

(B) the boiler or process heater has a design heat input capacity equal to or greater than 44 megawatts or 149.6 million British thermal units per hour.

(2) Any pneumatic pump at a well site that operates fewer than 90 days per calendar year is exempt from the requirements of this division.

(3) Except for the control requirements in §115.175(b) or (c) of this title (relating to Storage Tank Control Requirements), any storage tank that meets one of the following conditions is exempt from the requirements in this division:

(A) a storage tank with the potential to emit of less than 6.0 tons per year of volatile organic compounds (VOC) emissions, which must be calculated in accordance with §115.175(c)(2) of this title;

(B) a storage tank with uncontrolled actual VOC emissions of less than 4.0 tons per year, which must be calculated in accordance with §115.175(c)(1) of this title;

(C) a process vessel such as a surge control vessel, bottom receiver, or knockout vessel;

(D) a pressure vessel designed to operate in excess of 29.7 pounds per square inch absolute and designed to operate without emissions to the atmosphere; and

(E) a vessel that is skid-mounted or permanently attached to something that is mobile (such as trucks, railcars, barges, or ships) and is intended to be located at a site for less than 180 consecutive days.

(4) Fugitive emission components at a natural gas processing plant that contact a process fluid that contains less than 1.0% VOC by weight are exempt from the requirements of this division.

(5) All pumps and compressors, other than those specified in §115.173 and §115.174 of this title (relating to Compressor Control Requirements and Pneumatic Controller and Pump Controller Requirements, respectively), that are equipped with a shaft sealing system that prevents or detects emissions of VOC from the seal are exempt from the fugitive monitoring requirements of §115.177 of this title (relating to Fugitive Emission Component Requirements). These seal systems may include, but are not limited to, dual pump seals with barrier fluid at higher pressure than process pressure, seals degassing to vent control systems kept in good working order, or seals equipped with an automatic seal failure detection and alarm system.

(6) At a natural gas processing plant, components that are insulated, making them inaccessible to monitoring with a hydrocarbon gas analyzer, are exempt from the hydrocarbon gas analyzer monitoring requirements of §115.177 and §115.178 of this title. Inspections using audio, visual, and olfactory means must still be conducted in accordance with the appropriate requirements of §115.177 and §115.178 of this title.

(7) At a natural gas processing plant, sampling connection systems, as defined in 40 Code of Federal Regulations (CFR) §63.161 (as amended January 17, 1997 (62 FR 2788)), that meet the requirements of 40 CFR §63.166(a) and (b) (as amended June 20, 1996 (61 FR 31439)) are exempt from the requirements of this division, except from the recordkeeping requirement in §115.180(2) of this title.

(8) Fugitive emission components located at a well site with one or more wells that produce on average 15-barrel equivalents or less per day are exempt from the requirements of this division, except from the recordkeeping requirement in §115.180(2) of this title.

(9) Natural gas processing plant pump, valve and connector fugitive components that contact a heavy liquid process fluid containing VOC having a true vapor pressure equal to or less than 0.044 pounds per square inch absolute (psia) (0.3 kiloPascals) at 68 degrees Fahrenheit (20 degrees Celsius) are exempt from the instrument monitoring (with a hydrocarbon gas analyzer) requirements of §115.177(b) of this title (relating to Monitoring and Inspection Requirements) if the components are inspected by visual, audio, and/or olfactory means according to the minimum inspection schedules specified in §115.177(b) of this title and the following procedures are followed when the inspection indicates that a leak may be present.

(A) The owner or operator shall monitor the heavy liquid service component within five days by the method specified in 115.177(b) and shall comply with the requirements of subparagraphs (B) through (D) of this paragraph.

(B) The owner or operator shall eliminate the visual, audible, olfactory, or other indication of a potential leak within five calendar days of detection.

(C) If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.

(i) When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided in 115.177(b).

(ii) The first attempt at repair shall be made no later than 5 calendar days after each leak is detected.

(D) First attempts at repair include, but are not limited to, the best operating practices described under 40 CFR §60.482-2a(c)(2) and §60.482-7a(e).

(10) Natural gas processing plant pressure relief devices routed through a closed vent system to a control device, process or fuel gas system are exempt from the instrument monitoring (with a hydrocarbon gas analyzer) requirements of §115.177(b) of this title (relating to Monitoring and Inspection Requirements) if the owner or operator inspects components by visual, audio, and/or olfactory means according to the minimum inspection schedules specified in §115.177(b) of this title and complies with procedures specified in either §115.172(a)(10)(A), (C) and (D) or §115.172(a)(10)(B).

(A) The owner or operator shall monitor the light liquid service component within five days by the method specified in 115.177(b) and shall comply with the requirements of paragraphs (C) through (D) of this subsection.

(B) The owner or operator shall eliminate the visual, audible, olfactory, or other indication of a potential leak within five calendar days of detection.

(C) If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.

(i) When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided in 115.177(b).

(ii) The first attempt at repair shall be made no later than 5 calendar days after each leak is detected.

(D) First attempts at repair include, but are not limited to, the best operating practices described under 40 CFR §60.482-2a(c)(2) and §60.482-7a(e).

(b) Equipment used only for materials outside the product stream from a crude oil or natural gas production well or after the point of custody transfer to a crude oil or natural gas distribution or storage segment is exempt from the requirements of this division.

(c) After the appropriate compliance date in §115.183 of this title (relating to Compliance Schedules) and upon the date that the wet seals on a centrifugal compressor subject to subsection (a) of this section are retrofitted with a dual mechanical or other equivalent dry seal control system, the compressor no longer meets the applicability of this division.

(d) After the appropriate compliance date in §115.183 of this title, if changes are made to a pneumatic pump or controller are such that the pump or controller does not meet the appropriate definitions in this division, the requirements of §115.174(a) or (b) of this title no longer apply. The change in applicability status must be documented in accordance with the recordkeeping requirements in §115.180 of this title. For example, a pneumatic controller converted to a solar-powered controller no longer meets the applicability of a pneumatic controller regulated by this division.

(e) Well sites that only contain one or more wellheads and do not contain additional equipment are exempt from the monitoring requirements of §115.177(b).

(f) Pressure relief valves vented to a process, fuel gas system, or equipped with a closed vent system routed to a control device that meet the requirements of §115.175(a)(2) and (4) are exempt from the monitoring requirements of §115.177(b), provided the closed vent system is monitored in accordance with §115.177.

§115.173.Compressor Control Requirements.

(a) Owners or operators of centrifugal compressors with wet seal fluid degassing systems must comply with the following requirements.

(1) Vapors must be routed from the wet seal fluid degassing system through a closed vent system that is designed and operated under normal operations to route all gases, vapors, and/or fumes from the wet seal fluid degassing system to a control device that meets the requirements of subsection (c) of this section. The closed vent system must operate under negative pressure at the inlet for vapors.

(2) The compressor must be equipped with a seal cover that forms a continuous impermeable barrier over the entire liquid surface area, and the cover must remain in a sealed position (e.g., covered by a gasketed lid or cap) except during periods necessary to inspect, maintain, repair, or replace equipment.

(b) Owners or operators of reciprocating compressors must comply with paragraph (1), (2) or (3) of this subsection.

(1) Replace the compressor rod packing on or before the compressor has operated for 26,000 hours from the most recent rod packing replacement. The number of hours the compressor operates must be continuously recorded beginning on the appropriate compliance date in §115.183 of this title (relating to Compliance Schedule).

(2) Replace the compressor rod packing within 36 months from the most recent rod packing replacement beginning from the appropriate compliance date in §115.183 of this title.

(3) Operate a closed vent system under negative inlet pressure that captures and routes rod packing vapor to a control device that meets the requirements of subsection (c) of this section.

(c) A control device, other than a device specified in paragraphs (3) or (4) of this subsection, may be used and must maintain a VOC control efficiency of at least 95% or a VOC concentration of equal to or less than 275 parts per million by volume (ppmv), as propane, on a wet basis corrected to 3% oxygen. The 95% VOC control efficiency and 275 ppmv VOC concentration are calculated from the gas stream at the control device outlet.

(1) The control device must be operated at all times when gases, vapors, or fumes are vented from the closed vent system to the control device. For a boiler or process heater used as the control device, the vent gas stream must be introduced into the flame zone of the boiler or process heater. Multiple vents may be routed to the same control device. Control devices and closed vent systems must comply with §115.178 of this title (relating to Monitoring and Inspection Requirements) and §115.179 of this title (relating to Approved Test Methods and Testing Requirements).

(2) Control devices must operate with no visible emissions, as determined through a visible emissions test conducted according to United States Environmental Protection Agency (EPA) Method 22, 40 Code of Federal Regulations (CFR) Part 60, Appendix A-7, Section 11, except for periods not to exceed a total of one minute during any 15-minute observation period.

(3) A flare may be used and must be designed and operated in accordance with 40 CFR §60.18(b) - (f) (as amended through December 22, 2008 (73 Federal Register (FR) 78209)). The flare must be lit at all times when VOC vapors are routed to the flare. Multiple vents may be routed to the same control device.

(4) VOC emissions may be routed to a process if the emissions are compatible with the process and would be retained within the process. Routing to a process is considered equivalent to a 95% control efficiency.

(5) A bypass installed on a closed vent system able to divert any portion of the flow from entering a control device or routing to a process must be in compliance with subparagraphs (A) or (B) of this paragraph.

(A) A flow indicator must be installed, calibrated, and maintained at the inlet of each bypass. The flow indicator must take a reading at least once every 15 minutes and initiate an alarm notifying operators to take prompt remedial action when bypass flows are present.

(B) Each bypass valve must be secured in the non-diverting position using a car-seal or a lock-and-key type configuration.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401791

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

Statutory Authority

The repealed rule is adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The repeal is also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted repeal implements TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401790

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

DIVISION 1. LOADING AND UNLOADING OF VOLATILE ORGANIC COMPOUNDS

30 TAC §§115.211 - 115.214, 115.216, 115.217, 115.219

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.219.Counties and Compliance Schedules.

(a) In Aransas, Bexar, Brazoria, Calhoun, Chambers, Collin, Dallas, Denton, El Paso, Fort Bend, Galveston, Gregg, Hardin, Harris, Jefferson, Liberty, Matagorda, Montgomery, Nueces, Orange, San Patricio, Tarrant, Travis, Victoria, and Waller Counties, the compliance date has passed and the owner or operator of each volatile organic compound (VOC) transfer operation shall continue to comply with this division. Bexar County is only subject to this division's covered attainment requirements in accordance with this compliance schedule until January 1, 2025, when the area must comply with nonattainment area requirements in accordance with subsection (f) of this section and is no longer required to meet the covered attainment requirements.

(b) In the covered attainment counties, as defined in §115.10 of this title (relating to Definitions), the compliance date has passed and the owner or operator of each gasoline bulk plant shall continue to comply with this division.

(c) In the covered attainment counties, as defined in §115.10 of this title, the compliance date has passed and the owner or operator of each gasoline terminal shall continue to comply with this division.

(d) The owner or operator of each gasoline terminal, gasoline bulk plant, or VOC transfer operation in Ellis, Johnson, Kaufman, Parker, and Rockwall Counties shall comply with this division as soon as practicable, but no later than March 1, 2009.

(e) The owner or operator of each gasoline terminal, gasoline bulk plant, or VOC transfer operation in Wise County shall comply with this division as soon as practicable, but no later than January 1, 2017. The owner or operator of each gasoline terminal or gasoline bulk plant in Wise County shall continue to comply with the applicable requirements in §§115.211(2), 115.212(b), and 115.214(b) of this title (relating to Emission Specifications; Control Requirements; and Inspection Requirements) until the facility achieves compliance with the applicable requirements in §§115.211(1), 115.212(a), and 115.214(a) of this title.

(f) The owner or operator of each VOC transfer operation, transport vessel, and marine vessel in the Bexar County area shall be in compliance with the nonattainment area requirements in this division no later than January 1, 2025.

(g) The owner or operator of an affected source that becomes subject to the requirements of this division on or after the applicable compliance date in this section, shall be in compliance with the requirements in this division as soon as practicable, but no later than 60 days after becoming subject.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401792

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.221, 115.222, 115.224, 115.226, 115.227, 115.229

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401793

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.234, 115.235, 115.237, 115.239

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement Texas Water Code, §§5.102, 5.103 and 7.002; and Texas Health and Safety Code, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.234.Inspection Requirements.

(a) No person in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, as defined in §115.10 of this title (relating to Definitions), shall allow a tank-truck tank to be filled with or emptied of gasoline at any facility subject to §115.214(a)(1)(C) or §115.224(2) of this title (relating to Inspection Requirements; and Inspection Requirements), or filled with non-gasoline volatile organic compounds (VOC) having a true vapor pressure greater than or equal to 0.5 pounds per square inch absolute under actual storage conditions at any facility subject to §115.214(a)(1)(C) of this title, unless the tank-truck tank has passed a leak-tight test within the past year as evidenced by a prominently displayed certification affixed near the United States Department of Transportation certification plate which:

(1) shows the date the tank-truck tank last passed the leak-tight test required by §115.235 of this title (relating to Approved Test Methods); and

(2) shows the identification number of the tank-truck tank.

(b) No person in the covered attainment counties, as defined in §115.10 of this title, shall allow a gasoline tank-truck tank to be filled or emptied at any facility subject to §115.214(b)(1)(C) or §115.224(2) of this title unless the tank-truck tank has passed a leak-tight test within the past year as evidenced by a prominently displayed certification affixed near the United States Department of Transportation certification plate which:

(1) shows the date the gasoline tank-truck tank last passed the leak-tight test required by §115.235 of this title; and

(2) shows the identification number of the tank-truck tank.

§115.235.Approved Test Methods.

(a) In the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, the following testing requirements apply.

(1) The owner or operator of any tank-truck which is filled with or emptied of gasoline at any facility subject to §115.214(a)(1)(C) or §115.224(2) of this title (relating to Inspection Requirements; and Inspection Requirements), or which is filled with non-gasoline volatile organic compounds (VOC) at any facility subject to §115.214(a)(1)(C) of this title shall cause each such tank to be tested annually to ensure that the tank is vapor-tight.

(2) Any tank failing to meet the testing criteria of paragraph (1) of this subsection shall be repaired and retested within 15 days.

(3) Testing required in paragraph (1) of this subsection shall be conducted in accordance with the following test methods, as appropriate:

(A) Test Method 27 (40 Code of Federal Regulations (CFR) 60, Appendix A) for determining vapor-tightness of gasoline delivery tank using pressure-vacuum test such that the pressure in the tank must change no more than three inches of water (0.75 kPa) in five minutes when pressurized to a gauge pressure of 18 inches of water (4.5 kPa) and when evacuated to a vacuum of six inches of water (1.5 kPa); or

(B) minor modifications to these test methods approved by the executive director.

(4) For tank-truck tanks which are filled with non-gasoline VOC at a facility subject to §115.214(a)(1)(C) of this title, annual testing using the leakage test method described in 49 CFR 180.407(h) for specification cargo tanks is an acceptable alternative to Test Method 27 (40 CFR 60, Appendix A).

(b) In the covered attainment counties, the following testing requirements shall apply.

(1) The owner or operator of any tank-truck which is filled or emptied at any facility subject to §115.214(b)(1)(C) or §115.224(2) of this title shall cause each such tank to be tested annually to ensure that the tank is vapor-tight.

(2) Any tank failing to meet the testing criteria of paragraph (1) of this subsection shall be repaired and retested within 15 days.

(3) Testing required in paragraph (1) of this subsection shall be conducted in accordance with the following test methods, as appropriate:

(A) Test Method 27 (40 CFR 60, Appendix A) for determining vapor tightness of gasoline delivery tank using pressure-vacuum test such that the pressure in the tank must change no more than three inches of water (0.75 kPa) in five minutes when pressurized to a gauge pressure of 18 inches of water (4.5 kPa) and when evacuated to a vacuum of six inches of water (1.5 kPa); or

(B) minor modifications to these test methods approved by the executive director.

§115.237.Exemptions.

(a) The following exemptions apply in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas.

(1) Any tank-truck tank which is used exclusively to transport volatile organic compounds (VOC) with a true vapor pressure less than 0.5 pounds per square inch absolute under actual storage conditions is exempt from the requirements of this division (relating to Control of Volatile Organic Compound Leaks From Transport Vessels).

(2) Transport vessels other than tank-trucks are exempt from the requirements of this division.

(3) Any tank-truck tank that is a portable tank, as defined in 49 Code of Federal Regulations 171.8, is exempt from the requirements of this division.

(b) In the covered attainment counties, transport vessels other than tank-trucks are exempt from the requirements of this division.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401794

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

DIVISION 1. PROCESS UNIT TURNAROUND AND VACUUM-PRODUCING SYSTEMS IN PETROLEUM

30 TAC §§115.311, 115.312, 115.315, 115.316, 115.319

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401795

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.352 - 115.357, 115.359

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401796

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

DIVISION 1. DEGREASING PROCESSES

30 TAC §§115.410 - 115.413, 115.415, 115.416, 115.419

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.419.Counties and Compliance Schedules.

(a) In Bexar, Brazoria, Chambers, Collin, Dallas, Denton, El Paso, Fort Bend, Galveston, Gregg, Hardin, Harris, Jefferson, Liberty, Montgomery, Nueces, Orange, Tarrant, Victoria, and Waller, Counties, the compliance date has passed and all affected persons shall continue to comply with this division.

(b) All affected persons in Bastrop, Caldwell, Comal, Guadalupe, Hays, Travis, Williamson, and Wilson Counties shall comply with this division as soon as practicable, but no later than December 31, 2005.

(c) All affected persons in Ellis, Johnson, Kaufman, Parker, and Rockwall Counties shall comply with this division as soon as practicable, but no later than March 1, 2009.

(d) All affected persons of a degreasing process in Wise County shall comply with this division as soon as practicable, but no later than January 1, 2017.

(e) All affected persons of a degreasing process in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties that becomes subject to this division on or after the applicable compliance date in subsection (a), (c), or (d) of this section shall comply with the requirements in this division as soon as practicable, but no later than 60 days after becoming subject.

(f) All affected owners or operators of a degreasing process in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties shall be in compliance with §115.412(b) of this title (relating to Control Requirements) by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(g) All affected owners or operators of a degreasing process in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall be in compliance with §115.412(c) of this title by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(h) The owner or operator of a degreasing process or operation in the Bexar County area subject to the requirements of this division shall comply with the requirements of this division by no later than January 1, 2025. All affected persons of a degreasing process or operation in the Bexar County area that becomes subject to this division on or after the applicable compliance date in this subsection shall comply with the requirements of this division by but no later than 60 days after becoming subject.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401798

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.420, 115.422, 115.423, 115.425 - 115.427, 115.429

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401800

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.430 - 115.432, 115.435, 115.436, 115.439

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401801

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.440 - 115.443, 115.445. 115.446, 115.449

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401803

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.450, 115.451, 115.453, 115.458, 115.459

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.450.Applicability and Definitions.

(a) Applicability. In the Bexar County, Dallas-Fort Worth and Houston-Galveston-Brazoria areas, as defined in §115.10 of this title (relating to Definitions), the requirements in this division apply to the following surface coating processes, except as specified in paragraphs (6) through (8) of this subsection:

(1) large appliance surface coating;

(2) metal furniture surface coating;

(3) miscellaneous metal parts and products surface coating, miscellaneous plastic parts and products surface coating, pleasure craft surface coating, and automotive/transportation and business machine plastic parts surface coating at the original equipment manufacturer and off-site job shops that coat new parts and products or that re-coat used parts and products;

(4) motor vehicle materials applied to miscellaneous metal and plastic parts specified in paragraph (3) of this subsection, at the original equipment manufacturer and off-site job shops that coat new metal and plastic parts or that re-coat used parts and products;

(5) paper, film, and foil surface coating lines with the potential to emit from all coatings greater than or equal to 25 tons per year of volatile organic compounds (VOC) when uncontrolled;

(6) in the Bexar County and Dallas-Fort Worth areas, automobile and light-duty truck assembly surface coating processes conducted by the original equipment manufacturer and operators that conduct automobile and light-duty truck surface coating processes under contract with the original equipment manufacturer;

(7) as of the compliance date specified in §115.459(e) or (g) of this title (relating to Compliance Schedules), industrial maintenance coatings in the Dallas-Fort Worth area and/or the Houston-Galveston-Brazoria area if the commission has published notice for the applicable area in the Texas Register, as provided in §115.459(e) or (g) of this title, to require compliance with the applicable contingency measure control requirements of §115.453(f) or (g) of this title (relating to Control Requirements); and

(8) as of the compliance date specified in §115.459(f) or (h) of this title, traffic marking coatings in the Dallas-Fort Worth area and/or the Houston-Galveston-Brazoria area if the commission has published notice for the applicable area in the Texas Register, as provided in §115.459(f) or (h) of this title, to require compliance with the applicable contingency measure control requirements of §115.453(h) or (i) of this title.

(b) General definitions. Unless specifically defined in the Texas Clean Air Act (Texas Health and Safety Code, Chapter 382) or in §§3.2, 101.1, or 115.10 of this title (relating to Definitions), the terms in this division have the meanings commonly used in the field of air pollution control. In addition, the following meanings apply in this division unless the context clearly indicates otherwise.

(1) Aerosol coating (spray paint)--A hand-held, pressurized, non-refillable container that expels an adhesive or a coating in a finely divided spray when a valve on the container is depressed.

(2) Air-dried coating--A coating that is cured at a temperature below 194 degrees Fahrenheit (90 degrees Celsius). These coatings may also be referred to as low-bake coatings.

(3) Baked Coating--A coating that is cured at a temperature at or above 194 degrees Fahrenheit (90 degrees Celsius). These coatings may also be referred to as high-bake coatings.

(4) Coating application system--Devices or equipment designed for the purpose of applying a coating material to a surface. The devices may include, but are not be limited to, brushes, sprayers, flow coaters, dip tanks, rollers, knife coaters, and extrusion coaters.

(5) Coating line--An operation consisting of a series of one or more coating application systems and associated flash-off area(s), drying area(s), and oven(s) wherein a surface coating is applied, dried, or cured. The coating line ends at the point the coating is dried or cured, or prior to any subsequent application of a different coating.

(6) Coating solids (or solids)--The part of a coating that remains on the substrate after the coating is dried or cured.

(7) Daily weighted average--The total weight of volatile organic compounds (VOC) emissions from all coatings subject to the same VOC limit in §115.453 of this title (relating to Control Requirements), divided by the total volume or weight of those coatings (minus water and exempt solvent), where applicable, or divided by the total volume or weight of solids, delivered to the application system on each coating line each day. Coatings subject to different VOC content limits in §115.453 of this title may not be combined for purposes of calculating the daily weighted average.

(8) Multi-component coating--A coating that requires the addition of a separate reactive resin, commonly known as a catalyst or hardener, before application to form an acceptable dry film. These coatings may also be referred to as two-component coatings.

(9) Normally closed container--A container that is closed unless an operator is actively engaged in activities such as adding or removing material.

(10) One-component coating--A coating that is ready for application as it comes out of its container to form an acceptable dry film. A thinner, necessary to reduce the viscosity, is not considered a component.

(11) Pounds of volatile organic compounds (VOC) per gallon of coating (minus water and exempt solvent)--The basis for content limits for surface coating processes that can be calculated by the following equation:

Figure: 30 TAC §115.450(b)(11) (No change.)

(12) Pounds of volatile organic compounds (VOC) per gallon of solids--The basis for emission limits for surface coating processes that can be calculated by the following equation:

Figure: 30 TAC §115.450(b)(12) (No change.)

(13) Spray gun--A device that atomizes a coating or other material and projects the particulates or other material onto a substrate.

(14) Surface coating processes--Operations that use a coating application system.

(c) Specific surface coating definitions. The following meanings apply in this division unless the context clearly indicates otherwise.

(1) Automobile and light-duty truck manufacturing--The following definitions apply to this surface coating category.

(A) Adhesive--Any chemical substance that is applied for the purpose of bonding two surfaces together other than by mechanical means.

(B) Automobile and light-duty truck adhesive--An adhesive, including glass-bonding adhesive, used in an automobile or light-duty truck assembly surface coating process and applied for the purpose of bonding two vehicle surfaces together without regard to the substrates involved.

(C) Automobile and light-duty truck bedliner--A multi-component coating used in an automobile or light-duty truck assembly surface coating process and applied to a cargo bed after the application of topcoat and outside of the topcoat operation to provide additional durability and chip resistance.

(D) Automobile and light-duty truck cavity wax--A coating, used in an automobile or light-duty truck assembly surface coating process, applied into the cavities of the vehicle primarily for the purpose of enhancing corrosion protection.

(E) Automobile and light-duty truck deadener--A coating used in an automobile or light-duty truck assembly surface coating process and applied to selected vehicle surfaces primarily for the purpose of reducing the sound of road noise in the passenger compartment.

(F) Automobile and light-duty truck gasket/gasket sealing material--A fluid used in an automobile or light-duty truck assembly surface coating process and applied to coat a gasket or replace and perform the same function as a gasket. Automobile and light-duty truck gasket/gasket sealing material includes room temperature vulcanization seal material.

(G) Automobile and light-duty truck glass-bonding primer--A primer, used in an automobile or light-duty truck assembly surface coating process, applied to windshield or other glass, or to body openings, to prepare the glass or body opening for the application of glass-bonding adhesives or the installation of adhesive-bonded glass. Automobile and light-duty truck glass-bonding primer includes glass-bonding/cleaning primers that perform both functions (cleaning and priming of the windshield or other glass, or body openings) prior to the application of an adhesive or the installation of adhesive-bonded glass.

(H) Automobile and light-duty truck lubricating wax/compound--A protective lubricating material used in an automobile or light-duty truck assembly surface coating process and applied to vehicle hubs and hinges.

(I) Automobile and light-duty truck sealer--A high viscosity material used in an automobile or light-duty truck assembly surface coating process and generally, but not always, applied in the paint shop after the body has received an electrodeposition primer coating and before the application of subsequent coatings (e.g., primer-surfacer). The primary purpose of automobile and light-duty truck sealer is to fill body joints completely so that there is no intrusion of water, gases, or corrosive materials into the passenger area of the body compartment. Such materials are also referred to as sealant, sealant primer, or caulk.

(J) Automobile and light-duty truck trunk interior coating--A coating used in an automobile or light-duty truck assembly surface coating process outside of the primer-surfacer and topcoat operations and applied to the trunk interior to provide chip protection.

(K) Automobile and light-duty truck underbody coating--A coating used in an automobile or light-duty truck assembly surface coating process and applied to the undercarriage or firewall to prevent corrosion or provide chip protection.

(L) Automobile and light-duty truck weather strip adhesive--An adhesive used in an automobile or light-duty truck assembly surface coating process and applied to weather-stripping materials for the purpose of bonding the weather-stripping material to the surface of the vehicle.

(M) Automobile assembly surface coating process--The assembly-line coating of new passenger cars, or passenger car derivatives, capable of seating 12 or fewer passengers.

(N) Electrodeposition primer--A process of applying a protective, corrosion-resistant waterborne primer on exterior and interior surfaces that provides thorough coverage of recessed areas. Electrodeposition primer is a dip-coating method that uses an electrical field to apply or deposit the conductive coating onto the part; the object being painted acts as an electrode that is oppositely charged from the particles of paint in the dip tank. Electrodeposition primer is also referred to as E-Coat, Uni-Prime, and ELPO Primer.

(O) Final repair--The operation(s) performed and coating(s) applied to completely assembled motor vehicles or to parts that are not yet on a completely assembled vehicle to correct damage or imperfections in the coating. The curing of the coatings applied in these operations is accomplished at a lower temperature than that used for curing primer-surfacer and topcoat. This lower temperature cure avoids the need to send parts that are not yet on a completely assembled vehicle through the same type of curing process used for primer-surfacer and topcoat and is necessary to protect heat-sensitive components on completely assembled vehicles.

(P) In-line repair--The operation(s) performed and coating(s) applied to correct damage or imperfections in the topcoat on parts that are not yet on a completely assembled vehicle. The curing of the coatings applied in these operations is accomplished at essentially the same temperature as that used for curing the previously applied topcoat. In-line repair is also referred to as high-bake repair or high-bake reprocess. In-line repair is considered part of the topcoat operation.

(Q) Light-duty truck assembly surface coating process--The assembly-line coating of new motor vehicles rated at 8,500 pounds gross vehicle weight or less and designed primarily for the transportation of property, or derivatives such as pickups, vans, and window vans.

(R) Primer-surfacer--An intermediate protective coating applied over the electrodeposition primer and under the topcoat. Primer-surfacer provides adhesion, protection, and appearance properties to the total finish. Primer-surfacer is also referred to as guide coat or surfacer. Primer-surfacer operations may include other coatings (e.g., anti-chip, lower-body anti-chip, chip-resistant edge primer, spot primer, blackout, deadener, interior color, basecoat replacement coating, etc.) that are applied in the same spray booth(s).

(S) Topcoat--The final coating system applied to provide the final color or a protective finish. The topcoat may be a monocoat color or basecoat/clearcoat system. In-line repair and two-tone are part of topcoat. Topcoat operations may include other coatings (e.g., blackout, interior color, etc.) that are applied in the same spray booth(s).

(T) Solids turnover ratio (RT')--The ratio of total volume of coating solids that is added to the electrodeposition primer system (EDP) in a calendar month divided by the total volume design capacity of the EDP system.

(2) Automotive/transportation and business machine plastic parts--The following definitions apply to this surface coating category.

(A) Adhesion prime--A coating that is applied to a polyolefin part to promote the adhesion of a subsequent coating. An adhesion prime is clearly identified as an adhesion prime or adhesion promoter on its accompanying material safety data sheet.

(B) Automotive/transportation plastic parts--Interior and exterior plastic components of automobiles, trucks, tractors, lawnmowers, and other mobile equipment.

(C) Black coating--A coating that has a maximum lightness of 23 units and a saturation less than 2.8, where saturation equals the square root of A2 + B2. These criteria are based on Cielab color space, 0/45 geometry. For spherical geometry, specular included, maximum lightness is 33 units.

(D) Business machine--A device that uses electronic or mechanical methods to process information, perform calculations, print or copy information, or convert sound into electrical impulses for transmission. This definition includes devices listed in Standard Industrial Classification codes 3572, 3573, 3574, 3579, and 3661 and photocopy machines, a subcategory of Standard Industrial Classification code 3861.

(E) Clear coating--A coating that lacks color and opacity or is transparent and that uses the undercoat as a reflectant base or undertone color.

(F) Coating of plastic parts of automobiles and trucks--The coating of any plastic part that is or will be assembled with other parts to form an automobile or truck.

(G) Coating of business machine plastic parts--The coating of any plastic part that is or will be assembled with other parts to form a business machine.

(H) Electrostatic prep coat--A coating that is applied to a plastic part solely to provide conductivity for the subsequent application of a prime, a topcoat, or other coating through the use of electrostatic application methods. An electrostatic prep coat is clearly identified as an electrostatic prep coat on its accompanying material safety data sheet.

(I) Flexible coating--A coating that is required to comply with engineering specifications for impact resistance, mandrel bend, or elongation as defined by the original equipment manufacturer.

(J) Fog coat--A coating that is applied to a plastic part for the purpose of color matching without masking a molded-in texture. A fog coat may not be applied at a thickness of more than 0.5 mil of coating solids.

(K) Gloss reducer--A coating that is applied to a plastic part solely to reduce the shine of the part. A gloss reducer may not be applied at a thickness of more than 0.5 mil of coating solids.

(L) Red coating--A coating that meets all of the following criteria:

(i) yellow limit: the hue of hostaperm scarlet;

(ii) blue limit: the hue of monastral red-violet;

(iii) lightness limit for metallics: 35% aluminum flake;

(iv) lightness limit for solids: 50% titanium dioxide white;

(v) solid reds: hue angle of -11 to 38 degrees and maximum lightness of 23 to 45 units; and

(vi) metallic reds: hue angle of -16 to 35 degrees and maximum lightness of 28 to 45 units. These criteria are based on Cielab color space, 0/45 geometry. For spherical geometry, specular included, the upper limit is 49 units. The maximum lightness varies as the hue moves from violet to orange. This is a natural consequence of the strength of the colorants, and real colors show this effect.

(M) Resist coat--A coating that is applied to a plastic part before metallic plating to prevent deposits of metal on portions of the plastic part.

(N) Stencil coat--A coating that is applied over a stencil to a plastic part at a thickness of 1.0 mil or less of coating solids. Stencil coats are most frequently letters, numbers, or decorative designs.

(O) Texture coat--A coating that is applied to a plastic part which, in its finished form, consists of discrete raised spots of the coating.

(P) Vacuum-metalizing coatings--Topcoats and basecoats that are used in the vacuum-metalizing process.

(3) Industrial maintenance coating--A high performance maintenance coating, including primers, sealers, undercoaters, intermediate coats, and topcoats, that is not applied to items meeting the definition for miscellaneous metal parts and products in §115.450(c)(6)(Q) of this section, and is formulated for application to stationary source substrates, including floors, exposed to one or more of the following extreme environmental conditions.

(A) Immersion in water, wastewater, or chemical solutions (aqueous and non-aqueous solutions), or chronic exposures of interior surfaces to moisture condensation; or

(B) Acute or chronic exposure to corrosive, caustic, or acidic agents, or to chemicals, chemical fumes, or chemical mixtures or solutions; or

(C) Frequent exposure to temperatures above 121°C (250°F); or

(D) Frequent heavy abrasion, including mechanical wear and frequent scrubbing with industrial solvents, cleansers, or scouring agents; or

(E) Exterior exposure of metal structures and structural components.

(4) Large appliance coating--The coating of doors, cases, lids, panels, and interior support parts of residential and commercial washers, dryers, ranges, refrigerators, freezers, water heaters, dishwashers, trash compactors, air conditioners, and other large appliances.

(A) Extreme high-gloss coating--A coating which, when tested by the American Society for Testing Material Test Method D523 adopted in 1980, shows a reflectance of 75% or more on a 60 degree meter.

(B) Extreme performance coating--A coating used on a metal surface where the coated surface is, in its intended use, subject to:

(i) chronic exposure to corrosive, caustic or acidic agents, chemicals, chemical fumes, chemical mixtures, or solutions;

(ii) repeated exposure to temperatures in excess of 250 degrees Fahrenheit (121 degrees Celsius);

(iii) repeated heavy abrasion, including mechanical wear and repeated scrubbing with industrial grade solvents, cleansers, or scouring agents; or

(iv) exposure to extreme environmental conditions, such as continuous outdoor exposure.

(C) Heat-resistant coating--A coating that must withstand a temperature of at least 400 degrees Fahrenheit (204 degrees Celsius) during normal use.

(D) Metallic coating--A coating that contains more than 0.042 pounds of metal particles per gallon of coating as applied. Metal particles are pieces of a pure elemental metal or a combination of elemental metals.

(E) Pretreatment coating--A coating that contains no more than 12% solids by weight and at least 0.50% acid by weight; is used to provide surface etching; and is applied directly to metal surfaces to provide corrosion resistance, adhesion, and ease of stripping.

(F) Solar-absorbent coating--A coating that has as its prime purpose the absorption of solar radiation.

(5) Metal furniture coating--The coating of metal furniture including, but not limited to, tables, chairs, wastebaskets, beds, desks, lockers, benches, shelves, file cabinets, lamps, and other metal furniture products or the coating of any metal part that will be a part of a nonmetal furniture product.

(A) Extreme high-gloss coating--A coating which, when tested by the American Society for Testing Material Test Method D523 adopted in 1980, shows a reflectance of 75% or more on a 60 degree meter.

(B) Extreme performance coating--A coating used on a metal surface where the coated surface is, in its intended use, subject to:

(i) chronic exposure to corrosive, caustic or acidic agents, chemicals, chemical fumes, chemical mixtures, or solutions;

(ii) repeated exposure to temperatures in excess of 250 degrees Fahrenheit (121 degrees Celsius);

(iii) repeated heavy abrasion, including mechanical wear and repeated scrubbing with industrial grade solvents, cleansers, or scouring agents; or

(iv) exposure to extreme environmental conditions, such as continuous outdoor exposure.

(C) Heat-resistant coating--A coating that must withstand a temperature of at least 400 degrees Fahrenheit (204 degrees Celsius) during normal use.

(D) Metallic coating--A coating containing more than 5.0 grams of metal particles per liter of coating as applied. Metal particles are pieces of a pure elemental metal or a combination of elemental metals.

(E) Pretreatment coating--A coating that contains no more than 12% solids by weight and at least 0.50% acid by weight; is used to provide surface etching; and is applied directly to metal surfaces to provide corrosion resistance, adhesion, and ease of stripping.

(F) Solar-absorbent coating--A coating that has as its primary purpose the absorption of solar radiation.

(6) Miscellaneous metal and plastic parts--The following definitions apply to this surface coating category.

(A) Camouflage coating--A coating used, principally by the military, to conceal equipment from detection.

(B) Clear coat--A coating that lacks opacity or is transparent and may or may not have an undercoat that is used as a reflectant base or undertone color.

(C) Drum (metal)--Any cylindrical metal shipping container with a capacity equal to or greater than 12 gallons but equal to or less than 110 gallons.

(D) Electric-dissipating coating--A coating that rapidly dissipates a high-voltage electric charge.

(E) Electric-insulting varnish--A non-convertible-type coating applied to electric motors, components of electric motors, or power transformers, to provide electrical, mechanical, and environmental protection or resistance.

(F) EMI/RFI shielding--A coating used on electrical or electronic equipment to provide shielding against electromagnetic interference (EMI), radio frequency interference (RFI), or static discharge.

(G) Etching filler--A coating that contains less than 23% solids by weight and at least 0.50% acid by weight and is used instead of applying a pretreatment coating followed by a primer.

(H) Extreme high-gloss coating--A coating which, when tested by the American Society for Testing and Materials Test Method D523 adopted in 1980, shows a reflectance of 75% or more on a 60 degree meter.

(I) Extreme performance coating--A coating used on a metal or plastic surface where the coated surface is, in its intended use, subject to one of the following conditions. Extreme performance coatings include, but are not limited to, coatings applied to locomotives, railroad cars, farm machinery, marine shipping containers, downhole drilling equipment, and heavy-duty trucks:

(i) chronic exposure to corrosive, caustic or acidic agents, chemicals, chemical fumes, chemical mixtures, or solutions;

(ii) repeated exposure to temperatures in excess of 250 degrees Fahrenheit (121 degrees Celsius);

(iii) repeated heavy abrasion, including mechanical wear and repeated scrubbing with industrial grade solvents, cleansers, or scouring agents; or

(iv) exposure to extreme environmental conditions, such as continuous outdoor exposure.

(J) Heat-resistant coating--A coating that must withstand a temperature of at least 400 degrees Fahrenheit (204 degrees Celsius) during normal use.

(K) High performance architectural coating--A coating used to protect architectural subsections and meets the requirements of the American Architectural Manufacturers Association's publication number AAMA 2604-05 (Voluntary Specification, Performance Requirements and Test Procedures for High Performance Organic Coatings on Aluminum Extrusions and Panels) or 2605-05 (Voluntary Specification, Performance Requirements and Test Procedures for Superior Performing Organic Coatings on Aluminum Extrusions and Panels).

(L) High temperature coating--A coating that is certified to withstand a temperature of 1000 degrees Fahrenheit (538 degrees Celsius) for 24 hours.

(M) Mask coating--A thin film coating applied through a template to coat a small portion of a substrate.

(N) Metallic coating--A coating containing more than 5.0 grams of metal particles per liter of coating as applied. Metal particles are pieces of a pure elemental metal or a combination of elemental metals.

(O) Military specification coating--A coating that has a formulation approved by a United States Military Agency for use on military equipment.

(P) Mold-seal coating--The initial coating applied to a new mold or a repaired mold to provide a smooth surface that when coated with a mold release coating, prevents products from sticking to the mold.

(Q) Miscellaneous metal parts and products--Parts and products considered miscellaneous metal parts and products include:

(i) large farm machinery (harvesting, fertilizing, and planting machines, tractors, combines, etc.);

(ii) small farm machinery (lawn and garden tractors, lawn mowers, rototillers, etc.);

(iii) small appliances (fans, mixers, blenders, crock pots, dehumidifiers, vacuum cleaners, etc.);

(iv) commercial machinery (computers and auxiliary equipment, typewriters, calculators, vending machines, etc.);

(v) industrial machinery (pumps, compressors, conveyor components, fans, blowers, transformers, etc.);

(vi) fabricated metal products (metal-covered doors, frames, etc.); and

(vii) any other category of coated metal products, including, but not limited to, those that are included in the Standard Industrial Classification Code major group 33 (primary metal industries), major group 34 (fabricated metal products), major group 35 (nonelectrical machinery), major group 36 (electrical machinery), major group 37 (transportation equipment), major group 38 (miscellaneous instruments), and major group 39 (miscellaneous manufacturing industries). Excluded are those surface coating processes specified in §115.420(c)(1) - (8) and (10) - (16) of this title (relating to Surface Coating Definitions) and paragraphs (1) - (4) and (6) - (8) of this subsection.

(R) Miscellaneous plastic parts and products--Parts and products considered miscellaneous plastic parts and products include, but are not limited to:

(i) molded plastic parts;

(ii) small and large farm machinery;

(iii) commercial and industrial machinery and equipment;

(iv) interior or exterior automotive parts;

(v) construction equipment;

(vi) motor vehicle accessories;

(vii) bicycles and sporting goods;

(viii) toys;

(ix) recreational vehicles;

(x) lawn and garden equipment;

(xi) laboratory and medical equipment;

(xii) electronic equipment; and

(xiii) other industrial and household products. Excluded are those surface coating processes specified in §115.420(c)(1) - (16) of this title and paragraphs (1) - (4) and (6) - (8) of this subsection.

(S) Multi-colored coating--A coating that exhibits more than one color when applied, is packaged in a single container, and applied in a single coat.

(T) Off-site job shop--A non-manufacturer of metal or plastic parts and products that applies coatings to such products at a site under contract with one or more parties that operate under separate ownership and control.

(U) Optical coating--A coating applied to an optical lens.

(V) Pail (metal)--Any cylindrical metal shipping container with a capacity equal to or greater than 1 gallon but less than 12 gallons and constructed of 29 gauge or heavier material.

(W) Pan-backing coating--A coating applied to the surface of pots, pans, or other cooking implements that are exposed directly to a flame or other heating elements.

(X) Prefabricated architectural component coating--A coating applied to metal parts and products that are to be used as an architectural structure.

(Y) Pretreatment coating--A coating that contains no more than 12% solids by weight and at least 0.50% acid by weight; is used to provide surface etching; and is applied directly to metal surfaces to provide corrosion resistance, adhesion, and ease of stripping.

(Z) Repair coating--A coating used to re-coat portions of a previously coated product that has sustained mechanical damage to the coating following normal surface coating processes.

(AA) Safety-indicating coating--A coating that changes physical characteristics, such as color, to indicate unsafe conditions.

(BB) Shock-free coating--A coating applied to electrical components to protect the user from electric shock. The coating has characteristics of being low-capacitance and high-resistance and having resistance to breaking down under high voltage.

(CC) Silicone-release coating--A coating that contains silicone resin and is intended to prevent food from sticking to metal surfaces such as baking pans.

(DD) Solar-absorbent coating--A coating that has as its primary purpose the absorption of solar radiation.

(EE) Stencil coating--A pigmented coating or ink that is rolled or brushed onto a template or stamp in order to add identifying letters, symbols, or numbers.

(FF) Touch-up coating--A coating used to cover minor coating imperfections appearing after the main surface coating process.

(GG) Translucent coating--A coating that contains binders and pigment and formulated to form a colored, but not opaque, film.

(HH) Vacuum-metalizing coating--The undercoat applied to the substrate on which the metal is deposited or the overcoat applied directly to the metal film. Vacuum metalizing or physical vapor deposition is the process whereby metal is vaporized and deposited on a substrate in a vacuum chamber.

(7) Motor vehicle materials--The following definitions apply to this surface coating category.

(A) Motor vehicle bedliner--A multi-component coating used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied to a cargo bed after the application of topcoat to provide additional durability and chip resistance.

(B) Motor vehicle cavity wax--A coating used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied into the cavities of the vehicle primarily for the purpose of enhancing corrosion protection.

(C) Motor vehicle deadener--A coating used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied to selected vehicle surfaces primarily for the purpose of reducing the sound of road noise in the passenger compartment.

(D) Motor vehicle gasket/sealing material--A fluid used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied to coat a gasket or replace and perform the same function as a gasket. Automobile and light-duty truck gasket/gasket sealing material includes room temperature vulcanization seal material.

(E) Motor vehicle lubricating wax/compound--A protective lubricating material used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied to vehicle hubs and hinges.

(F) Motor vehicle sealer--A high viscosity material used in a process that is not an automobile or light-duty truck manufacturing coating process and is generally, but not always, applied in the paint shop after the body has received an electrodeposition primer coating and before the application of subsequent coatings (e.g., primer-surfacer). The primary purpose of motor vehicle sealer is to fill body joints completely so that there is no intrusion of water, gases, or corrosive materials into the passenger area of the body compartment. Such materials are also referred to as sealant, sealant primer, or caulk.

(G) Motor vehicle trunk interior coating--A coating used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied to the trunk interior to provide chip protection.

(H) Motor vehicle underbody coating--A coating used in a process that is not an automobile or light-duty truck manufacturing coating process and is applied to the undercarriage or firewall to prevent corrosion or provide chip protection.

(8) Paper, film, and foil coating--The coating of paper and pressure-sensitive tapes (regardless of substrate and including paper, fabric, and plastic film), related web coating processes on plastic film (including typewriter ribbons, photographic film, and magnetic tape), metal foil (including decorative, gift wrap, and packaging), industrial and decorative laminates, abrasive products (including fabric coated for use in abrasive products), and flexible packaging.

(A) Paper, film, and foil coating includes the application of a continuous layer of a coating material across the entire width or any portion of the width of a paper, film, or foil web substrate to:

(i) provide a covering, finish, or functional or protective layer to the substrate;

(ii) saturate the substrate for lamination; or

(iii) provide adhesion between two substrates for lamination.

(B) Paper, film, and foil coating excludes coating performed on or in-line with any offset lithographic, screen, letterpress, flexographic, rotogravure, or digital printing press; or size presses and on-machine coaters that function as part of an in-line papermaking system.

(9) Pleasure craft--Any marine or fresh-water vessel used by individuals for noncommercial, nonmilitary, and recreational purposes that is less than 65.6 feet in length. A vessel rented exclusively to, or chartered for, individuals for such purposes is considered a pleasure craft.

(A) Antifoulant coating--A coating applied to the underwater portion of a pleasure craft to prevent or reduce the attachment of biological organisms, and registered with the United States Environmental Protection Agency as a pesticide under the Federal Insecticide, Fungicide, and Rodenticide Act (7 United States Code, §136).

(B) Antifoulant sealer/tie coating--A coating applied over an antifoulant coating to prevent the release of biocides into the environment or to promote adhesion between an antifoulant coating and a primer or other antifoulants.

(C) Extreme high-gloss coating--A coating that achieves at least 90% reflectance on a 60 degree meter when tested by American Society for Testing and Materials Method D523-89.

(D) Finish primer-surfacer--A coating applied with a wet film thickness less than 10 mils prior to the application of a topcoat for purposes of providing corrosion resistance, adhesion of subsequent coatings, a moisture barrier, or promotion of a uniform surface necessary for filling in surface imperfections.

(E) High-build primer-surfacer--A coating applied with a wet film thickness of 10 mils or more prior to the application of a topcoat for purposes of providing corrosion resistance, adhesion of subsequent coatings, or a moisture barrier, or promoting a uniform surface necessary for filling in surface imperfections.

(F) High-gloss coating--A coating that achieves at least 85% reflectance on a 60 degree meter when tested by American Society for Testing and Materials Test Method D523-89.

(G) Pleasure craft coating--A marine coating, except unsaturated polyester resin (fiberglass) coatings, applied by brush, spray, roller, or other means to a pleasure craft.

(H) Pretreatment wash primer--A coating that contains no more than 25% solids by weight and at least 0.10% acids by weight; used to provide surface etching; and applied directly to fiberglass and metal surfaces to provide corrosion resistance and adhesion of subsequent coatings.

(I) Repair coating--A coating used to re-coat portions of a previously coated product that has sustained mechanical damage to the coating following normal surface coating processes.

(J) Topcoat--A final coating applied to the interior or exterior of a pleasure craft.

(K) Touch-up coating--A coating used to cover minor coating imperfections appearing after the main surface coating process.

(10) Traffic marking coating--A coating labeled and formulated for marking and striping streets, highways, or other traffic surfaces including, but not limited to, curbs, berms, driveways, parking lots, sidewalks, and airport runways.

§115.459.Compliance Schedules.

(a) The owner or operator of a surface coating process in Brazoria, Chambers, Collin, Dallas, Denton, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Liberty, Montgomery, Parker, Rockwall, Tarrant, and Waller Counties subject to this division shall comply with the requirements of this division, except as specified in §115.453(f) - (i) of this title (relating to Control Requirements), no later than March 1, 2013.

(b) The owner or operator of a surface coating process in Wise County shall comply with the requirements in this division, except as specified in §115.453(f) - (i) of this title, no later than January 1, 2017.

(c) The owner or operator of a surface coating process in the Bexar County area subject to the requirements of this division shall comply with the requirements in this division no later than January 1, 2025.

(d) The owner or operator of a surface coating process that becomes subject to this division on or after the applicable compliance date of this section shall comply with the requirements in this division no later than 60 days after becoming subject.

(e) The owner or operator of a surface coating process in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties shall comply with §115.453(f) of this title by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this industrial maintenance coating contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failure to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(f) The owner or operator of a surface coating process in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties shall comply with §115.453(h) of this title by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this traffic marking coating contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failure to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(g) The owner or operator of a surface coating process in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall be in compliance with §115.453(g) of this title by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this industrial maintenance coating contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(h) The owner or operator of a surface coating process in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall be in compliance with §115.453(i) of this title by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this traffic marking coating contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failure to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401804

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.460, 115.461, 115.463, 115.465, 115.468, 115.469

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.461.Exemptions.

(a) Solvent cleaning operations located on a property with total actual volatile organic compounds (VOC) emissions of less than 3.0 tons per calendar year from all cleaning solvents, when uncontrolled, are exempt from the requirements of this division, except as specified in §115.468(b)(2) of this title (relating to Monitoring and Recordkeeping Requirements). When calculating the VOC emissions, solvents used for solvent cleaning operations that are exempt from this division under subsections (b) - (d) and (f) of this section are excluded.

(b) The owner or operator of any process or operation subject to another division of this chapter that specifies solvent cleaning operation requirements related to that process or operation is exempt from the requirements in this division.

(c) A solvent cleaning operation is exempt from this division if:

(1) the process or operation that the solvent cleaning operation is associated with is subject to another division in this chapter; and

(2) the VOC emissions from the solvent cleaning operation are controlled in accordance with an emission specification or control requirement of the division that the process or operation is subject to.

(d) The following are exempt from the VOC limits in §115.463(a) of this title (relating to Control Requirements:

(1) electrical and electronic components;

(2) precision optics;

(3) numisimatic dies;

(4) resin mixing, molding, and application equipment;

(5) coating, ink, and adhesive mixing, molding, and application equipment;

(6) stripping of cured inks, cured adhesives, and cured coatings;

(7) research and development laboratories;

(8) medical device or pharmaceutical preparation operations;

(9) performance or quality assurance testing of coatings, inks, or adhesives;

(10) architectural coating manufacturing and application operations;

(11) magnet wire coating operations;

(12) semiconductor wafer fabrication;

(13) coating, ink, resin, and adhesive manufacturing;

(14) polyester resin operations;

(15) flexographic and rotogravure printing processes;

(16) screen printing operations; and

(17) digital printing operations.

(e) If the commission publishes notice in the Texas Register, as provided in §115.469(d) of this title (relating to Compliance Schedules) for the Dallas-Fort Worth area, or §115.469(e) of this title for the Houston-Galveston-Brazoria area, or both areas, to require compliance with the contingency measure control requirements of §115.463(e) of this title, then the exemptions in subsections (a) - (d) of this section are no longer available, and the following exemptions apply in the applicable area as of the compliance date specified in §115.469(d) or (e) of this title.

(1) In the Dallas-Fort Worth area, in accordance with the schedule specified in §115.469(d) of this title, the following types of cleaning are exempt from the VOC content limits in §115.463(e)(1) of this title:

(A) Cleaning of solar cells, laser hardware, scientific instruments, and high-precision optics;

(B) Cleaning conducted with performance laboratory tests on coatings, adhesives, or inks; research and development programs; and laboratory tests in quality assurance laboratories;

(C) Cleaning of paper-based gaskets, and clutch assemblies where rubber is bonded to metal by means of an adhesive;

(D) Cleaning of cotton swabs to remove cottonseed oil before cleaning of high-precision optics;

(E) Medical device and pharmaceutical facilities using up to 1.5 gallons per day of solvents;

(F) The cleaning of photocurable resins from stereolithography equipment and models;

(G) Cleaning of adhesive application equipment used for thin metal laminating operations provided the clean-up solvent used contains no more than 950 grams of VOC per liter;

(H) Cleaning of electronic or electrical cables provided the clean-up solvent used contains no more than 400 grams of VOC per liter;

(I) Touch up cleaning performed on printed circuit boards where surface mounted devices have already been attached provided that the solvent used contains no more than 800 grams of VOC per liter;

(J) Cleaning carried out in batch loaded cold cleaners, vapor degreasers, conveyorized degreasers, or motion picture film cleaning equipment;

(K) Janitorial cleaning, including graffiti removal; and

(L) Stripping of cured coatings, cured ink, or cured adhesives.

(2) In the Houston-Galveston-Brazoria area, in accordance with the schedule specified in §115.469(e) of this title, the following types of cleaning are exempt from the VOC content limits in §115.463(e)(2) of this title:

(A) Cleaning of solar cells, laser hardware, scientific instruments, and high-precision optics;

(B) Cleaning conducted with performance laboratory tests on coatings, adhesives, or inks; research and development programs; and laboratory tests in quality assurance laboratories;

(C) Cleaning of paper-based gaskets, and clutch assemblies where rubber is bonded to metal by means of an adhesive;

(D) Cleaning of cotton swabs to remove cottonseed oil before cleaning of high-precision optics;

(E) Medical device and pharmaceutical facilities using up to 1.5 gallons per day of solvents;

(F) The cleaning of photocurable resins from stereolithography equipment and models;

(G) Cleaning of adhesive application equipment used for thin metal laminating operations provided the clean-up solvent used contains no more than 950 grams of VOC per liter;

(H) Cleaning of electronic or electrical cables provided the clean-up solvent used contains no more than 400 grams of VOC per liter;

(I) Touch up cleaning performed on printed circuit boards where surface mounted devices have already been attached provided that the solvent used contains no more than 800 grams of VOC per liter;

(J) Cleaning carried out in batch loaded cold cleaners, vapor degreasers, conveyorized degreasers, or motion picture film cleaning equipment;

(K) Janitorial cleaning, including graffiti removal; and

(L) Stripping of cured coatings, cured ink, or cured adhesives.

(f) Cleaning solvents supplied in aerosol cans are exempt from the VOC limits in §115.463(a) of this title if total aerosol use for the property is less than 160 fluid ounces per day.

§115.469.Compliance Schedules.

(a) In Brazoria, Chambers, Collin, Dallas, Denton, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Liberty, Montgomery, Parker, Rockwall, Tarrant, Waller, and Wise Counties the compliance date has passed for control requirements in §115.463(a) - (d) of this title (relating to Control Requirements) and all associated requirements, and the owner or operator of a solvent cleaning operation shall continue to comply with the requirements in this division, except as specified in subsection (d) and (e) of this section.

(b) The owner or operator of a solvent cleaning operation in the Bexar County area subject to the requirements of this division shall comply with the requirements in this division no later than January 1, 2025.

(c) The owner or operator of a solvent cleaning operation that becomes subject to this division on or after the applicable compliance date in this section shall comply with the requirements in this division no later than 60 days after becoming subject.

(d) The owner or operator of a solvent cleaning operation in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties shall be in compliance with the requirements of §115.463(e) of this title (relating to Control Requirements) no later than 270 days after the commission publishes notification in the Texas Register of its determination that the industrial cleaning solvent contingency requirements are necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the federal Clean Air Act, §172(c)(9).

(e) The owner or operator of a solvent cleaning operation in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall be in compliance with the requirements of §115.463(e) of this title no later than 270 days after the commission publishes notification in the Texas Register of its determination that the contingency requirements are necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the federal Clean Air Act.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401806

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.470, 115.471, 115.473, 115.475, 115.478, 115.479

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.479.Compliance Schedules.

(a) In Brazoria, Chambers, Collin, Dallas, Denton, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Liberty, Montgomery, Parker, Rockwall, Tarrant, Waller, and Wise Counties, the compliance date has passed and the owner or operator of an application process shall continue to comply with this division except as specified in subsections (c) and (d) of this section.

(b) The owner or operator of an application process that becomes subject to this division on or after the applicable compliance date in this section shall comply with the requirements in this division no later than 60 days after becoming subject.

(c) The owner or operator of an application process in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties shall comply with §115.473(e) of this title (relating to Control Requirements) by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(d) The owner or operator of an application process in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall be in compliance with §115.473(f) of this title by no later than 270 days after the commission publishes notification in the Texas Register of its determination that this contingency rule is necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(e) The owner or operator of an application process in the Bexar County area subject to the requirements of this division shall comply with the requirements of this division no later than January 1, 2025.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401808

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

DIVISION 1. CUTBACK ASPHALT

30 TAC §§115.510, 115.512, 115.515 - 115.517, 115.519

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§115.519.Counties and Compliance Schedules.

(a) In Brazoria, Chambers, Collin, Dallas, Denton, Ellis, El Paso, Fort Bend, Galveston, Hardin, Harris, Jefferson, Johnson, Kaufman, Liberty, Montgomery, Nueces, Orange, Parker, Rockwall, Tarrant, Waller, and Wise Counties, the compliance date has passed for control requirements in 115.512(a) of this title (relating to Control Requirements) and all associated requirements, and all affected persons shall continue to comply with this division, except as specified in subsections (c) and (d) of this section. The compliance date for ozone attainment counties which have been added voluntarily to this division remain listed in §115.519(b).

(b) All affected persons in Bastrop, Caldwell, Hays, Travis, and Williamson Counties shall comply with this division no later than December 31, 2005.

(c) All affected persons in Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties shall be in compliance with the requirements of §115.512(b)(1) of this title no later than 270 days after the commission publishes notification in the Texas Register of its determination that the contingency requirements are necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act, §172(c)(9).

(d) All affected persons in Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties shall be in compliance with the requirements of §115.512(b)(2) of this title no later than 270 days after the commission publishes notification in the Texas Register of its determination that the contingency requirements are necessary as a result of EPA publication of a notice in the Federal Register that the specified area failed to attain the applicable National Ambient Air Quality Standard for ozone by the attainment deadline or failed to demonstrate reasonable further progress as set forth in the 1990 Amendments to the Federal Clean Air Act.

(e) All affected persons in the Bexar County area shall comply with this division no later than January 1, 2025.

(f) All affected persons that become subject to this division on or after the applicable compliance date in this section shall comply with the requirements in this division no later than 60 days after becoming subject.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401809

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

30 TAC §§115.531, 115.532, 115.534 - 115.537, 115.539

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401810

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

DIVISION 1. ALTERNATE MEANS OF CONTROL

30 TAC §115.901, §115.911

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401811

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Law Division

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-0634

The Texas Commission on Environmental Quality (TCEQ, agency, or commission) adopts new §§117.200, 117.203, 117.205, 117.230, 117.235, 117.240, 117.245, 117.252, 117.1100, 117.1103, 117.1105, 117.1120, 117.1140, 117.1145, 117.1152, 117.3124, 117.9010, and 117.9110; and amendments to §§117.10, 117.310, 117.340, 117.410, 117.440, 117.2010, 117.2035, 117.2110, 117.2135, 117.3000, 117.3103, 117.3110, 117.3120, 117.3145, 117.9030, 117.9300, 117.9320, and 117.9800.

New §§117.203, 117.1120, and 117.1140 are adopted with changes to the proposed text as published in the December 15, 2023, issue of the Texas Register (48 TexReg 7439) and, therefore, will be republished. All other new and amended sections are adopted without changes to the proposed text as published in the December 15, 2023, issue of the Texas Register (48 TexReg 7439) and, therefore, will not be republished.

The amended sections will be submitted to the United States Environmental Protection Agency (EPA) as revisions to the State Implementation Plan (SIP).

Background and Summary of the Factual Basis for the Adopted Rules

Reasonably Available Control Technology (RACT) Rules for Major Sources

The 1990 federal Clean Air Act (FCAA) Amendments (42 United States Code (USC), §§7401 et seq.) require EPA to establish primary National Ambient Air Quality Standards (NAAQS) that protect public health and to designate areas as either in attainment or nonattainment with the NAAQS, or as unclassifiable. States are primarily responsible for ensuring attainment and maintenance of the NAAQS once established by the EPA. Each state is required to submit a SIP to the EPA that provides for attainment and maintenance of the NAAQS.

Nonattainment areas classified as moderate and above are required to meet the mandates of the FCAA under §172(c)(1) and §182(b)(2) and (f). FCAA, §172(c)(1) requires that the SIP incorporate all reasonably available control measures, including RACT, as expeditiously as practicable for major sources of volatile organic compounds (VOC) and for all VOC sources covered by EPA-issued control techniques guidelines. FCAA, §182(f) requires the state to submit a SIP revision that implements RACT for all major sources of nitrogen oxides (NO_X).

The EPA defines RACT as the lowest emission limitation that a particular source is capable of meeting by the application of control technology that is reasonably available considering technological and economic feasibility (44 Federal Register (FR) 53761, September 17, 1979). RACT requirements for moderate and higher classification nonattainment areas are included in the FCAA to assure that significant source categories at major sources of ozone precursor emissions are controlled to a reasonable extent, but not necessarily to best available control technology (BACT) levels expected of new sources or to maximum achievable control technology (MACT) levels required for major sources of hazardous air pollutants. Although the FCAA requires the state to implement RACT, EPA guidance provides states with the flexibility to determine the most technologically and economically feasible RACT requirements for a nonattainment area. A major source is any stationary source or group of sources located within a contiguous area and under common control that emits or has the potential to emit a specific amount of NO_X emissions based on the area's nonattainment classification.

The adopted rulemaking will implement RACT requirements for major sources of NO_X in the Dallas-Fort Worth eight-hour ozone nonattainment area (DFW) and in Bexar County. TCEQ evaluated the existing major sources in the DFW area and in Bexar County and considered state and federal rules to determine what rules are necessary to fulfill FCAA RACT requirements. The adopted rules are necessary so that all major NO_X emission sources in the DFW area and Bexar County are subject to rules in 30 Texas Administrative Code (TAC) Chapter 117, or other federally enforceable measures, that meet or exceed the applicable RACT requirements. Additional NO_X controls on major sources were determined to be either not economically feasible or not technologically feasible, as documented in the concurrently adopted SIP revisions for Bexar County and the DFW and Bexar County areas (Project Nos. 2023-107-SIP-NR and 2023-132-SIP-NR, respectively).

Bexar County RACT

Bexar County is currently classified as moderate nonattainment for the 2015 eight-hour ozone NAAQS (87 FR 60897, October 7, 2022). Bexar County must attain the 2015 eight-hour ozone NAAQS by September 24, 2024 (87 FR 60897). The SIP revision to address FCAA requirements, including RACT, was due to the EPA by January 1, 2023, but the commission was unable to complete the review prior to the submission deadline. On October 18, 2023, EPA published a finding of failure to submit required SIP revisions for the 2015 eight-hour ozone NAAQS moderate nonattainment areas, effective November 17, 2023 (88 FR 71757). On October 12, 2023, Texas Governor Greg Abbott signed and submitted a letter to EPA to reclassify the Bexar County, DFW, and HGB moderate 2015 eight-hour ozone NAAQS nonattainment areas to serious. EPA's proposal to reclassify these areas to serious in accordance with Governor Abbott's letter was published on January 26, 2024 (89 FR 5145). EPA proposes that a number of moderate classification requirements are still due, including a RACT demonstration for Bexar County. This rulemaking and the concurrent Bexar County RACT SIP revision (Project No. 2023-132-SIP-NR) satisfy the NO_X RACT demonstration portion of the outstanding moderate area classification requirements for the 2015 eight-hour ozone NAAQS.

In Bexar County, a major source is any stationary source or group of sources located within a contiguous area and under common control that emits or has the potential to emit at least 100 tons per year (tpy) of NO_X. To identify all major sources of NO_X emissions in Bexar County, TCEQ reviewed the point source emissions inventory and Title V databases. All sources in the Title V database that were listed as a major source for NO_X emissions were included in the RACT analysis. Since the point source emissions inventory database reports actual emissions rather than potential to emit, TCEQ reviewed sources that reported actual emissions as low as 50 tpy of NO_X to account for the difference between actual and potential emissions. Sites from the emissions inventory database with emissions of 50 tpy or more of NO_X that were not identified in the Title V database and could not be verified as minor sources by other means are also included in the RACT analysis. The existing Chapter 117 rules, rules in other states, and federal rules were considered to evaluate what rules will be necessary to fulfill RACT requirements.

The adopted rulemaking implements RACT requirements for major sources of NO_X in Bexar County. The adopted provisions include emission standards, exemptions, monitoring, recordkeeping, reporting, and testing requirements that will apply to engines, turbines, boilers, and cement kilns at major sources of NO_X emissions in Bexar County. Affected sources will have to comply with these rules by January 1, 2025. The adoption includes new divisions or sections in 30 TAC Chapter 117, Subchapter B, Combustion Control at Major Industrial, Commercial, and Institutional Sources in Ozone Nonattainment Areas; Subchapter C, Combustion Control at Major Utility Electric Generation Sources in Ozone Nonattainment Areas; and Subchapter H, Administrative Provisions, Division 1, Compliance Schedule. In support of the new requirements, revisions will be adopted to Subchapter A, Definitions; Subchapter E, Multi-Region Combustion Control; and Subchapter H, Administrative Provisions, Division 2, Compliance Flexibility.

DFW RACT

The DFW area (Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties) was reclassified as severe for the 2008 eight-hour ozone NAAQS (87 FR 60926, October 7, 2022). The DFW area must attain the 2008 eight-hour ozone NAAQS by July 20, 2027 (87 FR 60926). The SIP revision to address severe nonattainment area requirements is due to the EPA on May 7, 2024.

In the DFW 2008 severe ozone NAAQS nonattainment area, a major source is any stationary source or group of sources located within a contiguous area and under common control that emits or has the potential to emit at least 25 tpy of NO_X. TCEQ reviewed the point source emissions inventory and Title V databases to identify all major sources of NO_X emissions in the DFW area. All sources in the Title V database that were listed as a major source for NO_X emissions were included in the RACT analysis. Since the point source emissions inventory database reports actual emissions rather than potential to emit, the TCEQ reviewed sources that reported actual emissions as low as 10 tpy of NO_X to account for the difference between actual and potential emissions. Sites from the emissions inventory database with emissions of 10 tpy or more of NO_X that were not identified in the Title V database and could not be verified as minor sources by other means are also included in the RACT analysis.

The existing Chapter 117 rules were compared to rules in other states and federal rules to determine whether the existing rules continue to fulfill RACT requirements. Chapter 117 rules that are consistent with or more stringent than controls implemented in other nonattainment areas were determined to fulfill RACT requirements. Federally approved state rules and rule approval dates can be found in 40 Code of Federal Regulations (CFR) §52.2270(c), EPA Approved Regulations in the Texas SIP. Emission sources subject to the more stringent BACT or MACT requirements were determined to also fulfill RACT requirements.

The commission reviewed the emission sources in the DFW area and the applicable Chapter 117 rules to verify that all major emission sources in the DFW area are subject to requirements that meet or exceed the applicable RACT requirements, or that further emission controls on the sources were either not economically feasible or not technologically feasible. The current EPA-approved Chapter 117 rules continue to fulfill RACT requirements. Additional NO_X controls on major sources were determined to be either not economically feasible or not technologically feasible.

The adopted rule project implements RACT requirements for major sources of NO_X in the DFW area. The adopted rulemaking will revise the definitions in Chapter 117, Subchapter A and compliance schedules in Subchapter H, Division 1 to lower the major source threshold from 50 tpy NO_X to 25 tpy of NO_X. Because the DFW area was previously classified as serious nonattainment for the 2008 eight-hour ozone standard, sources that emit or have the potential to emit at least 50 tpy NO_X are already required to comply with Chapter 117 RACT rules. This adopted rulemaking will extend implementation of RACT to all major sources of NO_X that emit or have the potential to emit at least 25 tpy NO_X. The adopted rulemaking will require major sources of NO_X to comply with new emission limits, control requirements, or operating requirements as well as other associated rule provisions necessary to implement any required NO_X control measures, such as monitoring, testing, recordkeeping, reporting, and exemptions by no later than November 7, 2025.

Rule Petition Revisions for the DFW and Houston-Galveston-Brazoria (HGB) Areas

On May 10, 2023, the commissioners directed the Executive Director to initiate a rulemaking to examine the issues raised in a rulemaking petition filed with the TCEQ on March 13, 2023, by Baker Botts LLP, on behalf of the Texas Industry Project under 30 TAC §20.15. As directed by the commission, the Executive Director reviewed the issues raised in the March 13, 2023, rulemaking petition. This adopted rulemaking will revise 30 TAC Chapter 117 for sources in the DFW and HGB areas to remove the requirements for certain engines to monitor NO_X emissions using continuous emissions monitoring systems (CEMS) or a predictive emissions monitoring system (PEMS), to adjust the applicable ammonia emission limit to be consistent with typical operation of diesel engines, and to remove the ammonia monitoring requirements for these engines. Although the Chapter 117 ammonia standards are not part of the SIP, both the NO_X and ammonia monitoring requirements are included as part of the SIP. Therefore, the rule changes will be submitted as part of the SIP.

The existing rules for major sources of NO_X in the DFW and HGB areas require the owner or operator of units that use a chemical reagent for reduction of NO_X emissions to install a CEMS or PEMS to monitor exhaust NO_X emissions (see §117.340(c)(1)(D) and §117.440(c)(1)(C)). The existing rules for major and minor sources of NO_X in the DFW and HGB areas require the owner or operator of units that use a chemical reagent for reduction of NO_X emissions (to comply with an ammonia emission specification and therefore) to monitor ammonia emissions from the unit using one of the ammonia monitoring procedures specified in §117.8130 (see §§117.340(d), 117.440(d), 117.2035(e)(2), and 117.2135(d)(2)). These monitoring requirements are used to verify that affected units meet the applicable NO_X and ammonia emission limits and provide additional assurance that NO_X and ammonia emission rates will not increase due to variation in the operation of the SCR systems.

Manufacturer-certified Tier 4 engines rely on selective catalytic reduction (SCR) with a chemical reagent (such as urea or ammonia) to meet the federal limits in 40 CFR Part 1039, Subpart B.

These engines are not manufactured with pre-installed CEMS because they are designed, tested, and certified to ensure that NO_X emissions conform to federal Tier 4 standards during all normal operating conditions. The engine and emission control system are designed to minimize or exclude adjustable operating parameters and all adjustable parameters include restrictions, limits, stops, or other means of inhibiting adjustment to prevent adjusting parameters to settings outside the tested ranges. Tier 4 engines with SCR systems are designed to ensure the system operates within the certified parameters and equipped with an engine diagnostic system that issues a warning if the quality or quantity of the reductant does not meet the design specifications. Ensuring the proper operation of the emission control system also ensures that ammonia emissions remain low.

Given that the engine and emission control system cannot be manipulated by operators due to the certified engine design and considering the significant cost of installing and operating a CEMS and the logistics of installing a building for the monitoring system for a unit that may be moved from one location to another, the commission adopts that a CEMS or PEMS is not necessary under Chapter 117 to provide reasonable assurance of compliance with the applicable NO_X and ammonia emission specifications for stationary diesel engines subject to the requirements of 40 CFR Part 1039, Subpart B, and the commission adopts to exempt these engines from the CEMS and PEMS NO_X monitoring requirements and the ammonia monitoring requirements in Chapter 117.

The existing rules for major and minor sources of NO_X in the DFW and HGB areas require the owner or operator of units subject to an ammonia emission specification under Chapter 117 to demonstrate initial compliance with the applicable ammonia specification (see §§117.340(d), 117.440(d), 117.2035(e)(2), and 117.2135(d)(2)). Because these units will not be equipped and operating with a CEMS or PEMS, owners or operators of these affected units will be required to conduct a stack test according to one of the allowed test methods under existing §117.8000(c)(4). The adopted rules also require these engines to be equipped with an engine diagnostic system that measures the quantity and quality of reductant to ensure proper operation of the SCR control system based on the requirements of existing 40 CFR Part 1039, Subpart B, §1039.110.

Existing Chapter 117 rules require that ammonia emissions must not exceed 10 parts per million by volume (ppmv) at 3.0% oxygen (O₂), dry, for all units that inject urea or ammonia into the exhaust stream for NO_X control. The commission adopts that correcting ammonia concentrations to the 3.0% O₂ level currently required is inappropriate for diesel engines that operate at significantly higher excess air in the exhaust stream and is adopting revisions to allow diesel engines to use the 15% O₂ correction consistent with the Chapter 117 standards for other equipment that also operates with higher O₂ in the exhaust gas (see §§117.310(c)(2), 117.410(c)(2), 117.2010(i)(2), 117.2110(h)(2)).

Demonstrating Noninterference Under FCAA §110(l)

The adopted changes are not expected to adversely impact Texas's progress in attaining the eight-hour ozone NAAQS. These manufacturer-certified Tier 4 engines remain subject to the NO_X and ammonia emission limits in Chapter 117. The engines are also required to comply with NO_X monitoring and testing requirements and ammonia testing requirements that will provide for the accurate accounting of emissions and provide reasonable assurance of compliance with the applicable NO_X and ammonia emission specifications for these stationary diesel engines. The adopted requirement for the diagnostic system to alert the owner or operator when the reductant material quality is not within material concentration specifications, as established by the SCR control system equipment manufacturer, will also provide confidence that the NO_X emission controls are properly functioning. All of these requirements will ensure no backsliding from the current SIP-approved requirements.

Section by Section Discussion

Subchapter A, Definitions

The commission adopts a revision to the definition of applicable ozone nonattainment area in §117.10(2) to include the Bexar County ozone nonattainment area, which consists of Bexar County, and then re-letters the definitions for the subsequent areas as necessary to put the list in alphabetical order.

The adoption revises the definition of electric power generating system in §117.10(14) to include adopted new Subchapter C, Division 2 for Bexar County Ozone Nonattainment Area Utility Electric Generation Sources and to exclude Bexar County sources from existing rules for Utility Electric Generation in East and Central Texas in Subchapter E, Division 1 after December 31, 2024. This change ensures that EGUs in Bexar County will remain in compliance with the existing rule until they are required to comply with the adopted new rule. Portions of the existing definition will be re-numbered as necessary to keep the list in alphabetical order.

The adoption revises the §117.10(29) definition of major source to include any stationary source or group of sources located within a contiguous area and under common control that emits or has the potential to emit at least 100 tpy of NO_X and is in the Bexar County ozone nonattainment area. The definition will also be revised to ensure that for the purposes of Chapter 117 Bexar County sources are only included in the major source definition contained in 40 CFR §52.21 (as amended June 3, 1993, effective June 3, 1994) until December 31, 2024, when sources are required to comply with the adopted new rule. The adoption also revises the definition of major source in §117.10(29) to lower the major source threshold from 50 tpy to 25 tpy of NO_X for sources in the DFW area. The change is necessary to account for the area's severe classification for the 2008 eight-hour ozone NAAQS. Major sources affected by the adopted rulemaking are required to comply with all applicable Chapter 117 rules by November 7, 2025, as stated in adopted changes to §117.9030. Minor sources that are currently subject to Chapter 117, Subchapter D, Division 2 remain subject to that division until they are required to comply with the major source rule in Chapter 117, Subchapter B, Division 4. This is necessary since engines at sources that emit or have the potential to emit more than 25 tpy NO_X but no more than 50 tpy NO_X will be transitioning from compliance with the minor source rule to compliance with the major source rule. The adopted compliance date was selected based on the RACT due date from EPA's severe reclassification final rule (87 FR 60931, October 7, 2022). Portions of the existing definition will be re-lettered as necessary to keep the list in alphabetical order.

The adopted rule revises the §117.10(51) definition of unit to reflect the adopted new requirements for Bexar County. The adopted change adds that for the purposes of §117.205 and associated requirements, a unit is any stationary gas turbine (including any duct burner used in the turbine exhaust duct) or gas-fired lean-burn stationary reciprocating internal combustion engine. The adopted rule also adds that for the purposes of §117.1105 and associated requirements, a unit is any utility boiler, auxiliary steam boiler, or stationary gas turbine (including any duct burner used in turbine exhaust ducts).

Subchapter B, Combustion Control at Major Industrial, Commercial, and Institutional Major Sources in Ozone Nonattainment Areas

Division 2, Bexar County Ozone Nonattainment Area Major Sources

The adopted rulemaking adds new Subchapter B, Division 2 to include RACT rules for major sources in Bexar County as required by FCAA §172(c)(1) and §182(f). The adopted new division sets NO_X emission limits for major sources in Bexar County and includes requirements necessary to demonstrate compliance with these limits, including monitoring, testing, reporting, and recordkeeping requirements. The adopted requirements are based on and are consistent with EPA-approved requirements for other nonattainment areas in the state.

Adopted new §117.200 specifies the rule applicability for the division. The adopted new division applies to stationary gas turbines, duct burners used in turbine exhaust ducts, and gas-fired lean-burn stationary reciprocating internal combustion engines located at any major stationary source of NO_X in Bexar County.

Adopted new §117.203 lists the units that are exempt from this division, except for the monitoring, testing, recordkeeping, and reporting requirements in adopted new §§117.240(i), 117.245(f)(4) and (9), and 117.252, which are necessary to document that the unit meets the exemption criteria. The adopted rule exempts stationary gas turbines and gas-fired lean-burn stationary reciprocating internal combustion engines that are used: in research and testing of the unit; for purposes of performance verification and testing of the unit; solely to power other gas turbines or engines during startups; exclusively in emergency situations, except that operation for testing or maintenance purposes of the gas turbine or engine is allowed for up to 100 hours per year, based on a rolling 12-month basis; or in response to and during the existence of any officially declared disaster or state of emergency. The adopted rule also exempts gas-fired lean-burn stationary reciprocating internal combustion engines with a horsepower (hp) rating less than 50 hp, and stationary gas turbines with a maximum rated capacity less than 10.0 million British thermal units per hour (MMBtu/hr). These adopted exemptions are consistent with EPA-approved exemptions for these same sources in other ozone nonattainment areas in Texas. The adopted rule also clarifies that units located at a major source that is subject to the adopted requirements for electric generating units in Subchapter C, Division 2 are exempt from this division. TCEQ adopts non-substantive changes to this new rule to update the rules in accordance with current Texas Register style and format requirements, improve readability, and establish consistency in the rules.

Adopted new §117.205 lists the NO_X emission specifications for RACT for affected units at major sources in Bexar County. Adopted subsection (a) limits NO_X emissions from stationary gas turbines to 0.55 pound per million British thermal unit (lb/MMBtu); limits NO_X emissions from duct burners used in turbine exhaust ducts to 0.55 lb/MMBtu; and limits NO_X emissions from gas-fired lean-burn stationary reciprocating internal combustion engines to 0.5 gram per horsepower-hour. The adopted limits are the same as limits for RACT sources in other nonattainment areas in Texas and are achievable using technologically and economically feasible controls. Adopted subsection (b) states that the emission specifications apply on a block one-hour average, in the units of the applicable emission specification, or if the unit is operated with a NO_X CEMS or PEMS the limits apply on a rolling 30-day average, in the units of the applicable emission specification. Adopted subsection (c) clarifies that the owner or operator may use emission credits for compliance with these emission specifications in accordance with §117.9800. This option is consistent with compliance options provided for RACT sources in other nonattainment areas in the state. Adopted subsection (d) lists requirements that are intended to prevent circumvention of these rules. Adopted subsection (d) specifies that the maximum rated capacity used to determine the applicability of the emission specifications in this section and the other associated requirements in this division must be the greater of the maximum rated capacity as of December 31, 2019; the maximum rated capacity after December 31, 2019; or the maximum rated capacity authorized by a permit issued under 30 TAC Chapter 116 after December 31, 2019. Adopted subsection (d) also states that the unit's classification is determined by the most specific classification applicable to the unit as of December 31, 2019. For example, a unit that is classified as a gas-fired lean-burn stationary reciprocating internal combustion engine as of December 31, 2019, but subsequently is authorized to operate as a dual-fuel engine, is classified as a gas-fired lean-burn stationary reciprocating internal combustion engine for the purposes of this chapter. Adopted subsection (d) also requires that a source that met the definition of major source on December 31, 2019, is always classified as a major source for purposes of this chapter. A source that did not meet the definition of major source (i.e., was a minor source, or did not yet exist) on December 31, 2019, but becomes a major source at any time after December 31, 2019, is from that time forward always classified as a major source for purposes of this chapter. December 31, 2019, was selected since 2019 is the emissions inventory year used in the attainment demonstration SIP modeling.

Adopted new §117.230 lists the operating requirements for units subject to the §117.205 RACT limits and requires all units to be operated to minimize NO_X emissions over the unit's operating or load range during normal operations. The adopted rule requires each unit controlled with post-combustion control techniques to be operated such that the reducing agent injection rate is maintained to limit NO_X concentrations to less than or equal to the NO_X concentrations achieved at maximum rated capacity. The adopted rule also requires each gas-fired lean-burn stationary reciprocating internal combustion engine to be checked for proper operation in accordance with the engine monitoring requirements in to §117.8140(b). These adopted operating requirements are consistent with EPA-approved requirements for these same sources in other ozone nonattainment areas in Texas.

Adopted new §117.235 contains the requirements for the initial demonstration of compliance with the adopted new §117.205 RACT limits. Adopted subsection (a) requires the owner or operator of any unit subject to the emission specifications in §117.205 to test the unit for NO_X and oxygen (O₂) emissions while firing gaseous fuel or, as applicable, liquid, and solid fuel. Adopted subsection (b) requires the initial demonstration of compliance testing to be performed in accordance with the compliance schedule in adopted new §117.9010. Adopted subsection (c) requires the initial demonstration of compliance tests to use the methods referenced in subsection (d) or (e). The adoption requires the tests be used for determination of initial compliance with the RACT emission specifications and requires test results to be reported in the units of the applicable emission specifications and averaging periods. Adopted new subsection (d) specifies that any CEMS or PEMS required by §117.240 must be installed and operational before conducting the required tests. The adoption specifies that verification of operational status must, at a minimum, include completion of the initial monitor certification and the manufacturer's written requirements or recommendations for installation, operation, and calibration of the device or system. Adopted new subsection (e) states that for units operating without CEMS or PEMS, compliance with the emission specifications must be demonstrated according to the stack testing requirements in §117.8000. Adopted new subsection (f) states that for units operating with CEMS or PEMS, initial compliance with the emission specifications must be demonstrated after monitor certification testing using the CEMS or PEMS. For units complying with a NO_X emission specification on a block one-hour average, every one-hour period while operating at the maximum rated capacity (or as near thereto as practicable) is used to determine compliance with the NO_X emission specification. Adopted new subsection (g) requires compliance stack test reports to include the information required in §117.8010. These adopted requirements are consistent with EPA-approved requirements for these same sources in other ozone nonattainment areas in Texas.

Adopted new §117.240 includes the requirements for continuous demonstration of compliance with the RACT emission specifications. Adopted new subsection (a) requires units to have totalizing fuel flow meters, with an accuracy of ± 5%, to individually and continuously measure the gas and liquid fuel usage. A computer that collects, sums, and stores electronic data from continuous fuel flow meters is an acceptable totalizer. The owner or operator must continuously operate the totalizing fuel flow meter at least 95% of the time when the unit is operating during a calendar year. For the purpose of compliance with this subsection for units having pilot fuel supplied by a separate fuel system or from an unmonitored portion of the same fuel system, the fuel flow to pilots may be calculated using the manufacturer's design flow rates rather than measured with a fuel flow meter. The calculated pilot fuel flow rate must be added to the monitored fuel flow when fuel flow is totaled. Adopted subsection (a) also provides alternatives to the fuel flow monitoring requirements. The adopted alternative for units operating with a NO_X and diluent CEMS may monitor stack exhaust flow using the flow monitoring specifications of 40 CFR Part 60, Appendix B, Performance Specification 6 or 40 CFR Part 75, Appendix A. Units that vent to a common stack with a NO_X and diluent CEMS may use a single totalizing fuel flow meter. Gas-fired lean-burn stationary reciprocating internal combustion engines and gas turbines equipped with a continuous monitoring system that continuously monitors horsepower and hours of operation are not required to install totalizing fuel flow meters. The continuous monitoring system for such units must be installed, calibrated, maintained, and operated according to manufacturers' recommended procedures.

Adopted new subsection (b) specifies the requirements for NO_X monitors. The adoption requires using a CEMS or PEMS to monitor exhaust NO_X for units with a rated heat input greater than or equal to 100 MMBtu per hour; stationary gas turbines with a megawatt (MW) rating greater than or equal to 30 MW operated more than 850 hours per year; units that use a chemical reagent for reduction of NO_X; and units that the owner or operator elects to comply with the NO_X emission specifications of §117.205(a) using a pound per MMBtu limit on a 30-day rolling average. The adoption specifies that units subject to the NO_X CEMS requirements of 40 CFR Part 75 are not required to install CEMS or PEMS under this subsection. The adoption provides options that the owner or operator must use to provide substitute emissions compliance data during periods when the NO_X monitor is off-line. The adoption requires that if the NO_X monitor is a CEMS subject to 40 CFR Part 75, the missing data procedures specified in 40 CFR Part 75, Subpart D must be to provide substitute emissions compliance data during periods when the NO_X monitor is off-line. The adoption requires that if the NO_X monitor is a CEMS subject to subject to 40 CFR Part 75, Appendix E, the missing data procedures specified in 40 CFR Part 75, Appendix E, §2.5 must be used to provide substitute emissions compliance data during periods when the NO_X monitor is off-line. The adoption requires that if the NO_X monitor is a PEMS, the methods specified in 40 CFR Part 75, Subpart D or calculations in accordance with §117.8110(b) must be used to provide substitute emissions compliance data during periods when the NO_X monitor is off-line. The owner or operator can monitor operating parameters for each unit in accordance with 40 CFR Part 75, Appendix E, §1.1 or §1.2 and calculate NO_X emission rates based on those procedures. Lastly, the owner or operator can use the maximum block one-hour emission rate as measured during the initial demonstration of compliance required in §117.235.

Adopted new subsection (c) requires the owner or operator of any CEMS used to meet a pollutant monitoring requirement of this section to comply with the emission monitoring system requirements of §117.8100(a). Adopted new subsection (d) requires any PEMS used to meet a pollutant monitoring requirement of this section must predict the pollutant emissions in the units of the applicable emission limit and must meet the emission monitoring system requirements of §117.8100(b). Adopted new subsection (e) requires the owner or operator of any gas-fired lean-burn stationary reciprocating internal combustion engine subject to the emission specifications in §117.205 to stack test engine NO_X emissions as specified in §117.8140(a). Adopted new subsection (f) requires the owner or operator of any stationary gas turbine or gas-fired lean-burn stationary reciprocating internal combustion engine claimed exempt using the exemption of §117.203(1)(D) to record the operating time with a non-resettable elapsed run time meter in order to the unit meets the exemption criteria. Adopted new subsection (g) requires that after the initial demonstration of compliance required by §117.235, the methods required in this section must be used to determine compliance with the emission specifications. For enforcement purposes, the executive director may also use other commission compliance methods to determine whether the unit is in compliance with applicable emission specifications. Adopted new subsection (h) requires the owner or operator of units that are subject to the emission specifications in §117.205 to test the units as specified in §117.235 in accordance with the applicable schedule specified in §117.9010. The adoption also requires the owner or operator of any unit not equipped with CEMS or PEMS that are subject to the emission specifications of §117.205 to retest the unit as specified in §117.235 within 60 days after any modification that could reasonably be expected to increase the NO_X emission rate.

Adopted new section §117.245 includes the notification, recordkeeping, and reporting requirements necessary to demonstrate compliance with this division. Adopted new subsection (a) requires that for units subject to the startup and/or shutdown provisions of §101.222, hourly records must be made of startup and/or shutdown events and maintained for a period of at least two years. Records must be available for inspection by the executive director, the EPA, and any local air pollution control agency having jurisdiction upon request. These records must include but are not limited to: type of fuel burned; quantity of each type of fuel burned; and the date, time, and duration of the procedure. Adopted new subsection (b) requires the owner or operator of a unit subject to the emission specifications of §117.205 to submit written notification of any CEMS or PEMS relative accuracy test audit (RATA) conducted under §117.240 or any testing conducted under §117.235 at least 15 days in advance of the date of the RATA or testing to the appropriate regional office and any local air pollution control agency having jurisdiction. Adopted new subsection (c) requires the owner or operator of a unit subject to the emission specifications of §117.205(a) to furnish the Office of Compliance and Enforcement, the appropriate regional office, and any local air pollution control agency having jurisdiction a copy of any testing conducted under §117.235 and any CEMS or PEMS RATA conducted under §117.240 within 60 days after completion of such testing or evaluation and not later than the compliance date specified in §117.9010.

Adopted new §117.245(d) requires the owner or operator of a unit required to install a CEMS or PEMS under §117.240 to report in writing to the executive director on a semiannual basis any exceedance of the applicable emission specifications of this division and the monitoring system performance. All reports must be postmarked or received by the 30th day following the end of each calendar semiannual period (i.e., July 30 and January 30). The adoption specifies that the written reports must include the magnitude of excess emissions computed in accordance with 40 CFFR §60.13(h), any conversion factors used, the date and time of commencement and completion of each time period of excess emissions, and the unit operating time during the reporting period. The reports must specifically identify each period of excess emissions that occurs during startups, shutdowns, and malfunctions of the affected unit, the nature and cause of any malfunction (if known), and the corrective action taken or preventative measures adopted. The reports must include the date and time identifying each period when the continuous monitoring system was inoperative (except for zero and span checks), the nature of the system repairs or adjustments, and periods when no excess emissions have occurred or the continuous monitoring system has not been inoperative, repaired, or adjusted. The adoption specifies that only a summary report form (as outlined in the latest edition of the commission's Guidance for Preparation of Summary, Excess Emission, and Continuous Monitoring System Reports) must be submitted, unless otherwise requested by the executive director, if the total duration of excess emissions for the reporting period is less than 1.0% of the total unit operating time for the reporting period and the CEMS or PEMS downtime for the reporting period is less than 5.0% of the total unit operating time for the reporting period. If the total duration of excess emissions for the reporting period is greater than or equal to 1.0% of the total unit operating time for the reporting period or the CEMS or PEMS downtime for the reporting period is greater than or equal to 5.0% of the total unit operating time for the reporting period, a summary report and an excess emission report must both be submitted.

Adopted new subsection (e) requires the owner or operator of any gas-fired engine subject to the emission specifications in §117.205 to report in writing to the executive director on a semiannual basis any excess emissions and the air-fuel ratio monitoring system performance. All reports must be postmarked or received by the 30th day following the end of each calendar semiannual period (i.e., July 30 and January 30). The adoption specifies that the written reports must include the magnitude of excess emissions (based on the quarterly emission checks of §117.230(a)(2)) and the biennial emission testing required in accordance with §117.240(e), computed in pounds per hour and grams per horsepower-hour, any conversion factors used, the date and time of commencement and completion of each time period of excess emissions, and the engine operating time during the reporting period. The report must also specifically identify, to the extent feasible, of each period of excess emissions that occurs during startups, shutdowns, and malfunctions of the engine or emission control system, the nature and cause of any malfunction (if known), and the corrective action taken or preventative measures adopted.

Adopted new subsection (f) requires the owner or operator of a unit subject to the requirements of this division to maintain written or electronic records of the data specified in this subsection. Such records must be kept for a period of at least five years and must be made available upon request by authorized representatives of the executive director, the EPA, or local air pollution control agencies having jurisdiction. The adoption specifies that the records must include records of annual fuel usage for each unit subject to §117.240(a). For each unit using a CEMS or PEMS in accordance with §117.240, the records must include monitoring records of hourly emissions and fuel usage (or stack exhaust flow) for units complying with an emission specification enforced on a block one-hour average; or daily emissions and fuel usage (or stack exhaust flow) for units complying with an emission specification enforced on a daily or rolling 30-day average. Emissions must be recorded in units of pounds per million British thermal units (lb/MMBtu) heat input and pounds or tons per day. The adoption requires that for each stationary internal combustion engine subject to the emission specifications of this division, records must include emissions measurements required by §117.230(2) and §117.240(e) of this title; catalytic converter, air-fuel ratio controller, or other emissions-related control system maintenance, including the date and nature of corrective actions taken; and daily average horsepower and total daily hours of operation for each engine that the owner or operator elects to use the alternative monitoring system allowed under §117.240(a)(2)(C). The adoption requires that for units claimed exempt from emission specifications using the exemption in §117.203(a)(1)(D), records must include monthly hours of operation. In addition, for each turbine or engine claimed exempt under §117.203(a)(1)(D) or (E), written records must be maintained of the purpose of turbine or engine operation and, if operation was for an emergency situation, identification of the type of emergency situation and the start and end times and date(s) of the emergency situation. The adoption requires records of the results of initial certification testing, evaluations, calibrations, checks, adjustments, and maintenance of CEMS or PEMS. The adoption also requires records of the results of performance testing, including initial demonstration of compliance testing conducted in accordance with §117.235.

Adopted new §117.252 contains the control plan procedures for RACT. The adoption requires the owner or operator of any unit subject to §117.205 to maintain a control plan report to show compliance with the requirements of §117.205. The report must include a list of all units that are subject to §117.205 that specifies: the facility identification number and emission point number as submitted to the Emissions Assessment Section of the commission; the emission point number as listed on the Maximum Allowable Emissions Rate Table of any applicable commission permit; the maximum rated capacity; the method of NO_X control for each unit; the emissions measured by testing required in §117.235; the compliance stack test report or monitor certification report required by §117.235; and the use of any compliance flexibility in accordance with §117.9800. The report must also list all units with a claimed exemption from the emission specification of §117.205 and the specific rule citation claimed as the basis for any that exemption. The adoption requires the report to be submitted to the Office of Compliance and Enforcement, the appropriate regional office, and the Office of Air by the applicable date specified for control plans in §117.9010. The adoption also specifies that for any unit that becomes subject to §117.205 after the applicable date specified in §117.9010, the report must be submitted to the Office of Compliance and Enforcement, the appropriate regional office, and the Office of Air no later than 60 days after becoming subject. The adoption specifies that if any of the information changes in a control plan report submitted in accordance with the section, including the installation of functionally identical replacement units, the control plan must be updated no later than 60 days after the change occurs. Written or electronic records of the updated control plan must be kept for a period of at least five years and must be made available upon request by authorized representatives of the executive director, the EPA, or local air pollution control agencies having jurisdiction.

Division 3, Houston-Galveston-Brazoria Ozone Nonattainment Area Major Sources

The adopted rulemaking amends §117.310(c)(2) to specify that for diesel engines that inject urea or ammonia into the exhaust stream for NO_X control, ammonia emissions must not exceed 10 ppmv at 15% O₂, dry instead of 3% O₂, dry, as currently in effect. The existing rules require that ammonia emissions must not exceed 10 parts per million at 3.0% O₂, dry, for certain units that inject urea or ammonia into the exhaust stream for NO_X control. Correcting ammonia concentrations to the 3.0% O₂ level currently required is inappropriate for diesel engines that operate at significantly higher excess air in the exhaust stream. The adopted rule change to allow diesel engines to use the 15% O₂ correction consistent with the Chapter 117 standards for other equipment that also operates with higher O₂ in the exhaust gas.

The adoption also amends §117.340(c)(2) to add adopted new subparagraph (C) to specify that CEMS and PEMS are not required to be installed on stationary diesel engines equipped with SCR systems using a reductant other than the engine's fuel with a diagnostic system that monitors reductant quality and tank levels and alerts operators to the need to refill the reductant tank before it is empty, or to replace the reductant if it does not meet applicable concentration specifications. The adoption states that if the SCR uses input from an exhaust NO_X sensor (or other sensor) to alert operators when reductant quality is inadequate, reductant quality does not need to be monitored separately. The adoption also requires the reductant tank level to be monitored in accordance with the manufacturer's design to demonstrate compliance. The existing Chapter 117 requirement to monitor exhaust NO_X concentrations using CEMS or PEMS on units using a chemical reagent to reduce NO_X was included in the rule to ensure compliance with the applicable NO_X standards for units that rely on reagent-based emissions control systems that can be adjusted by the operator. Manufacturer-certified Tier 4 engines are designed to meet certain federal NO_X emissions limits and, as such, include SCR systems designed to monitor several parameters over which the operator has no control. The engines are intended to be tamper-resistant and not subject to alteration. Tier 4 engines are not manufactured with pre-installed CEMS because these inherent design standards ensure NO_X emissions conform to the Tier 4 standards. Given that the control system cannot be manipulated and considering the significant cost of installing and operating a CEMS, a CEMS or PEMS is not necessary to provide reasonable assurance of compliance with the NO_X emission standards. At proposal, the commission requested comment on any changes that need to be made to the language to ensure it applies to all of the engines intended to be covered by this exemption. No comments were received.

The adoption will also amend §117.340(d) to exempt these engines from the ammonia monitoring requirement in this subsection. It is not necessary to install CEMS or PEMS or monitor ammonia emissions from these engines since these engines are intended to be tamper resistant and not subject to alteration.

Division 4, Dallas-Fort Worth Ozone Nonattainment Area Major Sources

The adopted rulemaking amends §117.410(c)(2) to specify that for diesel engines that inject urea or ammonia into the exhaust stream for NO_X control, ammonia emissions must not exceed 10 ppmv at 15% O₂, dry instead of 3% O₂, dry. The existing rules require that ammonia emissions must not exceed 10 parts per million at 3.0% O₂, dry, for certain units that inject urea or ammonia into the exhaust stream for NO_X control. However, correcting ammonia concentrations to the 3.0% O₂ level currently required is inappropriate for diesel engines that operate at significantly higher excess air in the exhaust stream. The adopted rule change to allow diesel engines to use the 15% O₂ correction consistent with the Chapter 117 standards for other equipment that also operates with higher O₂ in the exhaust gas.

The adoption also amends §117.440(c)(2) to include the existing reference to NO_X CEMS requirements of 40 CFR Part 75 as new subparagraph (A) and add adopted new subparagraph (B) to specify that CEMS and PEMS are not required to be installed on stationary diesel engines equipped with SCR systems using a reductant other than the engine's fuel with a diagnostic system that monitors reductant quality and tank levels and alerts operators to the need to refill the reductant tank before it is empty, or to replace the reductant if it does not meet applicable concentration specifications. The adoption states that if the SCR uses input from an exhaust NO_X sensor (or other sensor) to alert operators when reductant quality is inadequate, reductant quality does not need to be monitored separately. The adoption also requires the reductant tank level to be monitored in accordance with the manufacturer's design to demonstrate compliance. The existing Chapter 117 requirement to monitor exhaust NO_X concentrations using CEMS or PEMS on units using a chemical reagent to reduce NO_X was included in the rule to ensure compliance with the applicable NO_X standards for units that rely on reagent-based emissions control systems that can be adjusted by the operator. Manufacturer-certified Tier 4 engines are designed to meet certain federal NO_X emissions limits and, as such, include SCR systems designed to monitor several parameters over which the operator has no control. The engines are intended to be tamper-resistant and not subject to alteration. Tier 4 engines are not manufactured with pre-installed CEMS because these inherent design standards ensure NO_X emissions conform to the Tier 4 standards. Given that the control system cannot be manipulated and considering the significant cost of installing and operating a CEMS, a CEMS or PEMS is not necessary to provide reasonable assurance of compliance with the NO_X emission standards. At proposal, the commission requested comment on any changes that need to be made to the language to ensure it applies to all the engines intended to be covered by this exemption. No comments were received.

The adoption will also amend §117.440(d) to exempt these engines from the ammonia monitoring requirement in this subsection. It is not necessary to install CEMS or PEMS or monitor ammonia emissions from these engines since these engines are intended to be tamper resistant and not subject to alteration.

Subchapter C, Combustion Control at Major Utility Electric Generation Sources in Ozone Nonattainment Areas

Division 2, Bexar County Ozone Nonattainment Area Utility Electric Generation Sources

Adopted new §117.1100 specifies the rule applicability for the division. The adopted new division applies to utility boilers, auxiliary steam boilers, stationary gas turbines, and duct burners used in turbine exhaust ducts used in an electric power generating system in Bexar County. The adopted rule states that this division is applicable for the life of each affected unit in an electric power generating system or until this division or sections of this title that are applicable to an affected unit are rescinded.

Adopted new §117.1103 lists the units that are exempt from this division, except the monitoring, recordkeeping and reporting requirements that are necessary to document that the unit meets the exemption criteria. The adopted exemption applies to (1) any utility boiler or auxiliary steam boiler with an annual heat input less than or equal to 220,000 MMBtu per year; (2) any stationary gas turbines that operate less than 850 hours per year, based on a rolling 12-month basis; and (3) any stationary gas turbines that are used solely to power other gas turbines or engines during startups.

Adopted new §117.1105 contains the emission specifications RACT that sources must comply with in accordance with the applicable schedule in adopted new §117.9110. The emission specifications were determined to be both technologically and economically feasible. The emission rates are consistent with EPA-approved RACT limits for similar sources in the other nonattainment areas in the state and permit limits for this type of unit. The adopted new subsection (a)(1) limits NO_X emissions from stationary gas turbines, including duct burners used in turbine exhaust ducts, to 0.032 lb/MMBtu heat input on a rolling 30-day average basis. The adopted new subsection (a)(2) limits NO_X emissions from utility boilers or auxiliary steam boilers, while firing natural gas or a combination of natural gas and oil, to 0.2 lb/MMBtu heat input on a rolling 30-day average basis. The adopted new subsection (a)(3) limits NO_X emissions from utility boilers or auxiliary steam boilers controlled with SCR, while firing coal, to 0.069 lb/MMBtu heat input on a rolling 30-day average basis. The adopted new subsection (a)(4) limits NO_X emissions from utility boilers or auxiliary steam boilers not controlled with SCR, while firing coal, to 0.20 lb/MMBtu heat input on a rolling 30-day average basis. The adopted new subsection (a)(5) limits NO_X emissions from utility boilers or auxiliary steam boilers, while firing oil only to 0.30 lb/MMBtu heat input on an hourly basis. Compliance with adopted emission specifications on a rolling 30-day average beginning on January 1, 2025, will be based on CEMS or PEMS data from the previous 30 operating days. The adopted new subsection (b) provides compliance flexibility by including options for sources to meet a system cap or use emission credits to comply with the NO_X emission specifications of this section.

The adoption adds new §117.1120 to add a system cap option for affected sources. The adopted new subsection (a) allows an owner or operator of an electric generating facility (EGF) to achieve compliance with the NO_X emission specifications in §117.1105 by achieving equivalent NO_X emission reductions obtained by compliance with a 30-day system cap emission limitation in accordance with the requirements of this section. Adopted new subsection (b) requires each EGF within an electric power generating system that started operation before January 1, 2025 (the adopted compliance date for this division), and is subject to §117.1105, to be included in the system cap. Adopted new subsection (c) provides an equation to calculate the rolling 30-day system cap. The 30-day rolling average NO_X emission cap in pounds per day is the product of the applicable emission specification in §117.1105 for each EGF times the average of the daily heat input for each EGF in the emission cap in MMBtu per day for any system 30-day period in 2019, 2020, 2021, 2022, or 2023 (the same 30-day period must be used for all EGFs in the emission cap). This value is then summed for all EGFs in the electric power generating system. Adopted new subsection (d) indicates that compliance with the system cap must be demonstrated in accordance with the requirements in adopted new §117.1140. Adopted new subsection (e) indicates that records, including semiannual reports for the monitoring systems, must be retained in accordance with adopted new §117.1145. Adopted new subsection (f) is revised in response to comments received on the proposal. The adopted rule requires the owner or operator to report any exceedance of the system cap emission limit to the appropriate regional office within three calendar days instead of the proposed 48 hours. Adopted new subsection (f) is also revised to require the owner or operator to then follow up no later than 60 calendar days after the exceedance, instead of the proposed 21 days, with a written report to the regional office that includes an analysis of the cause for the exceedance with appropriate data to demonstrate the amount of emissions in excess of the system cap and the necessary corrective actions taken by the company to assure future compliance. Additionally, the owner or operator shall submit semiannual reports for the monitoring systems in accordance with §117.1145 of this title. Adopted new subsection (g) requires sources to comply with the system cap in accordance with the schedule specified in adopted new §117.9110. Adopted new subsection (h) allows an EGF that is permanently retired or decommissioned and rendered inoperable to continue to be included in the system cap emission limit provided that the permanent shutdown occurred on or after the January 1, 2025 compliance date for this division. Adopted new subsection (i) prohibits emission reductions from shutdowns or curtailments that have been used for netting or offset purposes for an air permit issued under 30 TAC Chapter 116 from being included in the in the calculation of the system cap. Adopted new subsection (j) indicates that for the purposes of determining compliance with the system cap, the contribution of each affected EGF that is operating during a startup, shutdown, or emissions event must be calculated from the NO_X emission rate measured by the NO_X monitor, if the monitor is operating properly, or if the NO_X monitor is not operating properly, the substitute data procedures identified in §117.1140 must be used. Adopted new subsection (k) allows emission credits may be used in accordance with the requirements of §117.9800 to exceed the system cap.

The adoption adds new §117.1140 to specify the requirements for demonstrating compliance with the adopted new emission limits. Adopted new subsection (a) requires owners or operators to install, calibrate, maintain, and operate a CEMS or PEMS to measure NO_X on an individual basis for all units subject to the adopted new emission specifications in §117.1105. The adoption requires each CEMS or PEMS to comply with the relative accuracy test audit relative accuracy (RATA) requirements of 40 CFR Part 75, Appendix B, Figure 2, except the concentration options (parts per million by volume (ppmv) and lb/MMBtu) do not apply. The adoption also requires each CEMS or PEMS to meet either the relative accuracy percent requirement of 40 CFR Part 75, Appendix B, Figure 2, or an alternative relative accuracy requirement of ± 2.0 ppmv from the reference method mean value. The adoption requires CEMS or PEMS to comply with the emission monitoring system requirements of §117.8110. The adoption requires PEMS to predict NO_X emissions in the units of the applicable emission limitations and requires that data and fuel flow meters to be used to demonstrate continuous compliance. Adopted new subsection (b) provides acid rain peaking units the option to monitor operating parameters for each unit in accordance with 40 CFR Part 75, Appendix E, and calculate NO_X emission rates based on those procedures instead of using a CEMS or PEMS.

Adopted new §117.1140(c) also requires units subject to the adopted new emission specifications in §117.1105 and units claiming exemption under adopted new §117.1103(1) to use totalizing fuel flow meters to individually and continuously measure the gas and liquid fuel usage unless the owner or operator opts to assume fuel consumption at maximum design fuel flow rates during hours of the unit's operation. The adoption indicates that a computer that collects, sums, and stores electronic data from continuous fuel flow meters is an acceptable totalizer. Adopted new subsection (d) requires that a unit using the adopted exemption in §117.1103(2) record the operating time hours with an elapsed run time meter. Adopted new subsection (e) requires the owner or operator of any unit using the adopted new exemptions in §117.1103(1) or (2) to notify the executive director within seven days if the applicable limit is exceeded and to submit a plan for review and approval within 90 days after loss of the exemption that details the schedule to meet the applicable limit no later than 24 months after the exceedance. The adoption indicates that if the limit is exceeded, the exemption from the emission specifications of this division is permanently withdrawn.

Adopted new §117.1140(f) requires the methods in this section to be used to demonstrate compliance with the adopted new emission specifications of §117.1105 and the adopted new system cap in §117.1120. The adoption allows the executive director to use other commission compliance methods to determine compliance with applicable emission specifications for enforcement purposes. The adoption explains that for units complying with the NO_X emission specifications of §117.1105 in lb/MMBtu on a rolling 30-day average basis, the rolling 30-day average is calculated for each day that fuel was combusted in the unit and is the total pounds of NO_X emissions from the unit for the preceding 30 days that fuel was combusted in the unit divided by the total heat input (in MMBtu) for the unit during the same 30-day period. In response to comments, the adopted subsection (f)(2) has been revised to clarify that for any EGF complying with the system cap requirements in §117.1120 in pounds per day on a rolling 30-day average basis, the rolling 30-day average is calculated for each day and is the average of the total pounds of NO_X emissions per day from all EGFs included in the system cap for the preceding 30 days. Adopted new subsection (g) requires the missing data procedures specified in 40 CFR Part 75, Subpart D to be used to provide substitute emissions compliance data during periods when the NO_X monitor is off-line except that a peaking unit may use the missing data procedures specified in 40 CFR Part 75, Appendix E, §2.5 and a PEMS for units not subject to the requirements of 40 CFR Part 75 may use calculations in accordance with §117.8110(b). At proposal, the commission requested comment on any additional data substitution procedures that may be appropriate. No comments were received.

Adopted new §117.1145 adds notification, recordkeeping, and reporting requirements. Adopted new subsection (a) requires written notification of any CEMS or PEMS RATA conducted under §117.1140 to be submitted at least 15 days prior to such date and (b) requires a copy of the results of any CEMS or PEMS RATA conducted under §117.1140 to be submitted within 60 days after completion of such testing or evaluation. Adopted new subsection (c) requires units subject to the startup and/or shutdown provisions of §101.222, to maintain hourly records of startup and/or shutdown events (including but not limited to the type of fuel burned; quantity of each type of fuel burned; gross and net energy production in megawatt-hours; and the date, time, and duration of the event) for a period of at least two years. The adopted rule specifies that the records must be available for inspection upon request by the executive director, EPA, and any local air pollution control agency having jurisdiction.

Adopted new §117.1145(d) requires the owner or operator of a unit required to install a CEMS or PEMS under adopted new §117.1140 to report in writing to the executive director on a semiannual basis any exceedance of the applicable emission limitations in this division and the monitoring system performance. All reports must be postmarked or received by the 30th day following the end of each calendar semiannual period (i.e., July 30 and January 30). The adoption requires the reports to include (1) the magnitude of excess emissions computed in accordance with 40 CFR §60.13(h), any conversion factors used, the date and time of commencement and completion of each time period of excess emissions, and the unit operating time during the reporting period; (2) specific identification of each period of excess emissions that occurs during startups, shutdowns, and malfunctions of the affected unit, the nature and cause of any malfunction (if known) and the corrective action taken or preventative measures adopted; and (3) the date and time identifying each period when the continuous monitoring system was inoperative, except for zero and span checks and the nature of the system repairs or adjustments. The adoption indicates that when no excess emissions have occurred or the continuous monitoring system has not been inoperative, repaired, or adjusted, such information must be stated in the report. The adoption specifies that only a summary report form (as outlined in the latest edition of the commission's Guidance for Preparation of Summary, Excess Emission, and Continuous Monitoring System Reports) is required if the total duration of excess emissions for the reporting period is less than 1.0% of the total unit operating time for the reporting period and the CEMS or PEMS monitoring system downtime for the reporting period is less than 5.0% of the total unit operating time for the reporting period (unless otherwise requested by the executive director). The adoption requires both a summary report and an excess emission report to be submitted if the total duration of excess emissions for the reporting period is greater than or equal to 1.0% of the total unit operating time for the reporting period or the CEMS or PEMS downtime for the reporting period is greater than or equal to 5.0% of the total unit operating time for the reporting period.

Adopted new §117.1145(e) lists the required records, which must be kept for at least five years and must be made available upon request by authorized representatives of the executive director, EPA, or local air pollution control agencies having jurisdiction. adopted new paragraph (1) requires the owner or operator of a unit complying with the NO_X emission specifications in §117.1105(a)(1) - (4) to maintain daily records indicating the NO_X emissions in lb; the quantity and type of each fuel burned; the heat input in MMBtu; and the rolling 30-day average NO_X emission rate in lb/MMBtu. Adopted new paragraph (2) requires the owner or operator of a unit complying with the NO_X emission specification in §117.1105(a)(5) to maintain hourly records indicating the NO_X emissions in lb; the quantity and type of each fuel burned; and the heat input in MMBtu. Adopted new paragraph (3) requires the owner or operator complying with the NO_X emission system cap in §117.1120 to maintain daily records for each EGF in the cap indicating the NO_X emissions in lb; the quantity and type of each fuel burned; and the heat input in MMBtu. In addition, the owner or operator shall maintain daily records indicating the total NO_X emissions in lb from all EGFs under the system cap and the rolling 30-day average NO_X emissions rate (in lb/day) for all EGFs under the system cap. Adopted new paragraph (4) requires the owner or operator of a unit using the exemption in §117.1103(1) to maintain monthly records indicating the quantity and type of each fuel burned, the heat input in MMBtu; and the rolling 12-month average heat input in MMBtu. Adopted new paragraph (5) requires the owner or operator of a unit the exemption in §117.1103(2) to maintain monthly records indicating the operating hours and the rolling 12-month average operating hours. Adopted new paragraph (6) requires the owner or operator to maintain records of records of the results of testing, evaluations, calibrations, checks, adjustments, and maintenance of a CEMS or PEMS.

Adopted new §117.1152 contains the control plan procedures for RACT. Adopted new subsection (a) requires the owner or operator of any unit subject to §117.1105 to submit a control plan report to show compliance with the requirements of §117.1105. The report must include: (1) the rule section used to demonstrate compliance, either §117.1105, §117.1120, or §117.9800; (2) the specific rule citation for any unit with a claimed exemption under §117.1105; (3) for each affected unit: the method of NO_X control, the method of monitoring emissions, and the method of providing substitute emissions data when the NO_X monitoring system is not providing valid data; and (4) for sources complying with §117.1120, detailed calculation of the system cap that includes all data relied on for each electric generating facility included in the system cap equation in §117.1120(c). Adopted new subsection (b) requires the report to be submitted to the Office of Compliance and Enforcement, the appropriate regional office, and the Office of Air by the applicable date specified for control plans in §117.9110. Adopted new subsection (c) specifies that for any unit that becomes subject to §117.1105 after the applicable date for control plans in §117.9110, the control plan must be submitted to the Office of Compliance and Enforcement, the appropriate regional office, and the Office of Air no later than 60 days after becoming subject. Adopted new subsection (d) requires that if any of the information changes in a control plan report submitted in accordance with subsection (b) or (c), including the installation of functionally identical replacements, the control plan must be updated no later than 60 days after the change occurs. Written or electronic records of the updated control plan must be kept for a period of at least five years and must be made available upon request by authorized representatives of the executive director, the EPA, or local air pollution control agencies having jurisdiction.

Subchapter D, Combustion Control at Minor Sources in Ozone Nonattainment Areas

Division 1, Houston-Galveston-Brazoria Ozone Nonattainment Area Minor Sources

The adopted rulemaking amends §117.2010(i)(2) to specify that for diesel engines that inject urea or ammonia into the exhaust stream for NO_X control, ammonia emissions must not exceed 10 ppmv at 15% O₂, dry instead of 3% O₂, dry. The existing rules require that ammonia emissions must not exceed 10 parts per million at 3.0% O₂, dry, for certain units that inject urea or ammonia into the exhaust stream for NO_X control. However, correcting ammonia concentrations to the 3.0% O₂ level currently required is inappropriate for diesel engines that operate at significantly higher excess air in the exhaust stream. The adopted rule change to allow diesel engines to use the 15% O₂ correction is consistent with the Chapter 117 standards for other equipment that also operate with higher O₂ in the exhaust gas.

The adoption will amend §117.2035(e)(2) to specify that the ammonia monitoring requirements in this paragraph do not apply to stationary diesel engines equipped with selective catalytic reduction systems that meet the following criteria. The SCR system must use a reductant other than the engine's fuel and operate with a diagnostic system that monitors reductant quality and tank levels. The diagnostic system must alert owners or operators to the need to refill the reductant tank before it is empty or to replace the reductant if the reductant does not meet applicable concentration specifications. If the SCR system uses input from an exhaust NO_X sensor (or other sensor) to alert owners or operators when the reductant quality is inadequate, the reductant quality does not need to be monitored separately by the diagnostic system. The reductant tank level must be monitored in accordance with the manufacturer's design to demonstrate compliance with this subparagraph. The method of alerting an owner or operator must be a visual or audible alarm.

Division 2, Dallas-Fort Worth Eight Hour Ozone Nonattainment Area Minor Sources

The adopted rulemaking amends §117.2110(h)(2) to specify that for diesel engines that inject urea or ammonia into the exhaust stream for NO_X control, ammonia emissions must not exceed 10 ppmv at 15% O₂, dry instead of 3% O₂, dry. The existing rules require that ammonia emissions must not exceed 10 parts per million at 3.0% O₂, dry, for certain units that inject urea or ammonia into the exhaust stream for NO_X control. However, correcting ammonia concentrations to the 3.0% O₂ level currently required is inappropriate for diesel engines that operate at significantly higher excess air in the exhaust stream. The adopted rule change to allow diesel engines to use the 15% O₂ correction is consistent with the Chapter 117 standards for other equipment that also operate with higher O₂ in the exhaust gas.

The adoption will amend §117.2135(d)(2) to specify that the ammonia monitoring requirements in paragraph (2) do not apply to stationary diesel engines equipped with selective catalytic reduction systems that meet all of the criteria specified in adopted new subparagraphs (A) - (F). The SCR system must use a reductant other than the engine's fuel and operate with a diagnostic system that monitors reductant quality and tank levels. The diagnostic system must alert owners or operators to the need to refill the reductant tank before it is empty or to replace the reductant if the reductant does not meet applicable concentration specifications. If the SCR system uses input from an exhaust NO_X sensor (or other sensor) to alert owners or operators when the reductant quality is inadequate, the reductant quality does not need to be monitored separately by the diagnostic system. The reductant tank level must be monitored in all cases in accordance with the manufacturer's design to demonstrate compliance with this subparagraph. The method of alerting an owner or operator must be a visual or audible alarm.

Subchapter E, Multi-Region Combustion Control

Division 1, Utility Electric Generation in East and Central Texas

The adopted rule amends the applicability in §117.3000 to specify that this division no longer applies in Bexar County after December 31, 2024. This change ensures that units in Bexar County will remain in compliance with the existing rule until they are required to comply with the adopted new rules for EGUs in Subchapter C, Division 2.

Division 2, Cement Kilns

The adopted rule amends §117.3103 for portland cement kilns exempted from the provisions of this division, to include any portland cement kiln placed into service on or after December 31, 1999, except as specified in adopted new Bexar County RACT requirements in §117.3124. The adopted amendments also state that after the compliance date specified in §117.9320(c), portland cement kilns that are subject to §117.3124 are exempt from §117.3110 and §117.3120 of this title. These adopted changes are necessary to ensure that cement kilns in Bexar County will remain in compliance with the existing rule until they are required to comply with the adopted new RACT requirements in §117.3124.

The adopted rulemaking adds language to the emission specification in §117.3110 and the source cap requirements in §117.3120 to state that these sections no longer apply in Bexar County after December 31, 2024. These adopted changes are necessary to ensure that cement kilns in Bexar County are subject to these rules only until they are required to comply with the adopted new RACT requirements in §117.3124.

Adopted new §117.3124 lists the Bexar County control requirements for RACT.

The adopted rule limits NO_X emissions from each preheater-precalciner or precalciner kiln in Bexar County to 2.8 pounds per ton (lb/ton) of clinker produced on a 30-day rolling average beginning on the compliance date specified in §117.9320. This adopted limit is consistent with limits for this type of kiln in other state and federal rules. For one of the two affected kilns, this limit represents an approximate 40% reduction from the average NO_X emissions from 2017-2022. The other affected kiln is currently operating below this rate and at proposal, the commission requested comments on the technological and economic feasibility of the existing kiln located at Capital Cement to meet a limit of 1.95 lb/ton of clinker produced on a 30-day rolling average during both normal conditions and during maintenance, startup, and shutdown. No comments were received. The adopted new section clarifies that for the purposes of this section, the 30-day rolling average is an average, calculated for each day that fuel was combusted in the cement kiln, as the total of all the hourly emissions data (in pounds) for the preceding 30 days that fuel was combusted in the cement kiln, divided by the total number of tons of clinker produced in that kiln during the same 30-day period. The adopted rule also states that an owner or operator may use emission credits in accordance with §117.9800 to meet the NO_X emission control requirements of this section, in whole or in part.

The adopted rule amends the notification, recordkeeping, and reporting requirements in §117.3145 to require monitoring records for kilns subject to §117.3124 to include the hourly, daily, and rolling 30-day average NO_X emissions (in pounds); the hourly, daily, and rolling 30-day average production of clinker (in United States short tons); and the rolling 30-day average NO_X emission rate (in lb/ton of clinker produced). These records are necessary to demonstrate compliance with the adopted new RACT requirements for kilns in Bexar County.

Subchapter H, Administrative Provisions

Division 1, Compliance Schedules

The adoption adds new §117.9010 to include the compliance schedule for Bexar County ozone nonattainment area major sources. The adoption requires the owner or operator of any stationary source of NO_X in Bexar County that is a major source of NO_X and is subject to the requirements of Subchapter B, Division 2 to comply with the requirements of that division as soon as practicable, but no later than January 1, 2025. The adoption also requires the owner or operator of any stationary source of NO_X that becomes subject to the requirements of Subchapter B, Division 2 on or after January 1, 2025 to comply with the requirements of the division as soon as practicable, but no later than 60 days after becoming subject.

The adoption amends the compliance schedule for DFW area major sources in §117.9030 to add that for units subject to the emission specifications of §117.405(b) located at sources in Wise County that emit or have the potential to emit equal to or greater than 25 tpy but less than 50 tpy of NO_X, submission of the initial control plan required by §117.450(b) is required no later than May 7, 2025; and compliance with all other requirements of Subchapter B, Division 4 is required as soon as practicable, but no later than November 7, 2025. The adoption adds requirements for the owner or operator of any unit that is subject to the emission specifications in §117.410(a) located in the DFW area that emits or has the potential to emit equal to or greater than 25 tpy but less than 50 tpy of NO_X to submit the initial control plan required by §117.450(b) no later than May 7, 2025; and comply with all other requirements of Subchapter B, Division 4 as soon as practicable, but no later than November 7, 2025. The adoption also states that the owner or operator of any stationary source of NO_X that becomes subject to the emission specifications in §117.410(a) on or after the applicable compliance date specified in paragraph (2) must comply with the requirements of Subchapter B, Division 4 as soon as practicable, but no later than 60 days after becoming subject.

The adoption adds new §117.9110 to include the compliance schedule for Bexar County ozone nonattainment area utility electric generation sources. The adoption requires the owner or operator of each electric utility in Bexar County to comply with the requirements of Subchapter C, Division 2 as soon as practicable, but no later than January 1, 2025. The adoption also requires the owner or operator of any electric utility that becomes subject to the requirements of Subchapter C, Division 2 on or after January 1, 2025, to comply with the requirements of that division as soon as practicable, but no later than 60 days after becoming subject.

The adoption amends §117.9300 to specify that beginning January 1, 2025, sources in Bexar County are no longer required to comply with the requirements of Subchapter E, Division 1. This change ensures that sources must comply with these requirements only until compliance with the adopted new RACT rules in Subchapter C, Division 2 is required.

The adoption amends §117.9320 to require the owner or operator of each portland cement kiln in Bexar County to comply with the requirements of §117.3124 and the applicable requirements of §117.3145 as soon as practicable, but no later than January 1, 2025.

Division 2, Compliance Flexibility

The adoption amends §117.9800 to allow for the use of emission credits for compliance with the adopted new Bexar County RACT requirements in §§117.205, 117.1105, 117.1120, and 117.3124. The adoption also specifies that for units using reduction credits in accordance with this section that are subject to new, more stringent rule limitations, the owner or operator using the reduction credits must submit a revised final control plan to the executive director in accordance with §117.1152. These requirements are the same as the EPA-approved options provided for other nonattainment areas in the state.

Final Regulatory Impact Determination

The commission reviewed the adopted rulemaking in light of the regulatory impact analysis requirements of Texas Government Code, §2001.0225, and determined that the adopted rulemaking does not meet the definition of a major environmental rule as defined in that statute, and in addition, if it did meet the definition, will not be subject to the requirement to prepare a regulatory impact analysis. A major environmental rule means a rule, the specific intent of which is to protect the environment or reduce risks to human health from environmental exposure, and that may adversely affect in a material way the economy, a sector of the economy, productivity, competition, jobs, the environment, or the public health and safety of the state or a sector of the state. Additionally, the adopted rulemaking does not meet any of the four applicability criteria for requiring a regulatory impact analysis for a major environmental rule, which are listed in Tex. Gov't Code Ann., §2001.0225(a). Section 2001.0225 of the Texas Government Code applies only to a major environmental rule, the result of which is to: 1) exceed a standard set by federal law, unless the rule is specifically required by state law; 2) exceed an express requirement of state law, unless the rule is specifically required by federal law; 3) exceed a requirement of a delegation agreement or contract between the state and an agency or representative of the federal government to implement a state and federal program; or 4) adopt a rule solely under the general powers of the agency instead of under a specific state law.

The specific intent of these adopted rules is to comply with federal requirements for the implementation of control strategies necessary to attain and maintain the NAAQS for ozone mandated by 42 USC, 7410, FCAA, §110, and required to be included in operating permits by 42 USC, §7661a, FCAA, §502, as specified elsewhere in this preamble. The adopted rule addresses RACT requirements for the Bexar County 2015 eight-hour ozone nonattainment area and the DFW 2008 eight-hour ozone nonattainment area as well as revisions to existing rules to remove specific monitoring requirements and adjust ammonia emission limits for certain engines as discussed elsewhere in this preamble. States are required to adopt SIPs with enforceable emission limitations and other control measures, means, or techniques, as well as schedules and timetables for compliance, as may be necessary or appropriate to meet the applicable requirements of the FCAA. As discussed in the FISCAL NOTE portion of this preamble, the adopted rules are not anticipated to add any significant additional costs to affected individuals or businesses beyond what is necessary to attain the ozone NAAQS on the economy, a sector of the economy, productivity, competition, jobs, the environment, or the public health and safety of the state or a sector of the state.

If a state does not comply with its obligations under 42 USC, §7410, FCAA, §110 to submit SIPs, states are subject to discretionary sanctions under 42 USC, §7410(m) or mandatory sanctions under 42 USC, §7509, FCAA, §179; as well as the imposition of a federal implementation plan (FIP) under 42 USC, §7410, FCAA, §110(c). Under 42 USC, §7661a, FCAA, §502, states are required to have federal operating permit programs that provide authority to issue permits and assure compliance with each applicable standard, regulation, or requirement under the FCAA, including enforceable emission limitations and other control measures, means, or techniques, which are required under 42 USC, §7410, FCAA, §110. Similar to requirements in 42 USC, §7410, FCAA, §110, states are not free to ignore requirements in 42 USC, §7661a, FCAA, §502 and must develop and submit programs to provide for operating permits for major sources that include all applicable requirements of the FCAA. Lastly, states are also subject to the imposition of sanctions under 42 USC, §7661a(d) and (i), FCAA, §502(d) and (i) for failure to submit an operating permits program, the disapproval of any operating permits program, or failure to adequately administer and enforce the approved operating permits program.

The requirement to provide a fiscal analysis of regulations in the Texas Government Code was amended by Senate Bill (SB) 633 during the 75th legislative session in 1997. The intent of SB 633 was to require agencies to conduct a regulatory impact analysis of extraordinary rules. These are identified in the statutory language as major environmental rules that will have a material adverse impact and will exceed a requirement of state law, federal law, or a delegated federal program, or are adopted solely under the general powers of the agency. With the understanding that this requirement will seldom apply, the commission provided a cost estimate for SB 633 that concluded "based on an assessment of rules adopted by the agency in the past, it is not anticipated that the bill will have significant fiscal implications for the agency due to its limited application." The commission also noted that the number of rules that will require assessment under the provisions of the bill was not large. This conclusion was based, in part, on the criteria set forth in the bill that exempted rules from the full analysis unless the rule was a major environmental rule that exceeds a federal law. Because of the ongoing need to meet federal requirements, the commission routinely proposes and adopts rules incorporating or designed to satisfy specific federal requirements. The legislature is presumed to understand this federal scheme. If each rule proposed by the commission to meet a federal requirement was considered to be a major environmental rule that exceeds federal law, then each of those rules would require the full regulatory impact analysis (RIA) contemplated by SB 633. Requiring a full RIA for all federally required rules is inconsistent with the conclusions reached by the commission in its cost estimate and by the Legislative Budget Board (LBB) in its fiscal notes. Since the legislature is presumed to understand the fiscal impacts of the bills it passes, and that presumption is based on information provided by state agencies and the LBB, the that the intent of SB 633 was only to require the full RIA for rules that are extraordinary in nature. While the adopted rules may have a broad impact, that impact is no greater than is necessary or appropriate to meet the requirements of the FCAA, and in fact creates no additional impacts since the adopted rules do not impose burdens greater than required to demonstrate attainment of the ozone NAAQS as discussed elsewhere in this preamble. For these reasons, the adopted rules fall under the exception in Texas Government Code, §2001.0225(a), because they are required by, and do not exceed, federal law.

The commission has consistently applied this construction to its rules since this statute was enacted in 1997. Since that time, the legislature has revised the Texas Government Code, but left this provision substantially unamended. It is presumed that "when an agency interpretation is in effect at the time the legislature amends the laws without making substantial change in the statute, the legislature is deemed to have accepted the agency's interpretation." (Central Power & Light Co. v. Sharp, 919 S.W.2d 485, 489 (Tex. App. Austin 1995), writ denied with per curiam opinion respecting another issue, 960 S.W.2d 617 (Tex. 1997); Bullock v. Marathon Oil Co., 798 S.W.2d 353, 357 (Tex. App. Austin 1990, no writ). Cf. Humble Oil & Refining Co. v. Calvert, 414 S.W.2d 172 (Tex. 1967); Dudney v. State Farm Mut. Auto Ins. Co., 9 S.W.3d 884, 893 (Tex. App. Austin 2000); Southwestern Life Ins. Co. v. Montemayor, 24 S.W.3d 581 (Tex. App. Austin 2000, pet. denied); and Coastal Indust. Water Auth. v. Trinity Portland Cement Div., 563 S.W.2d 916 (Tex. 1978).) The commission's interpretation of the RIA requirements is also supported by a change made to the Texas Administrative Procedure Act (APA) by the legislature in 1999. In an attempt to limit the number of rule challenges based upon APA requirements, the legislature clarified that state agencies are required to meet these sections of the APA against the standard of "substantial compliance" (Texas Government Code, §2001.035). The legislature specifically identified Texas Government Code, §2001.0225 as falling under this standard.

As discussed in this analysis and elsewhere in this preamble, the commission has substantially complied with the requirements of Texas Government Code, §2001.0225. The adopted rules implement the requirements of the FCAA as discussed in this analysis and elsewhere in this preamble. The adopted rules were determined to be necessary to attain the ozone NAAQS and are required to be included in permits under 42 USC, §7661a, FCAA, §502, and will not exceed any standard set by state or federal law. These adopted rules are not an express requirement of state law. The adopted rules do not exceed a requirement of a delegation agreement or a contract between state and federal government, as the adopted rules, if adopted by the commission and approved by EPA, will become federal law as part of the approved SIP required by 42 U.S.C. §7410, FCAA, §110. The adopted rules were not developed solely under the general powers of the agency but are authorized by specific sections of Texas Health and Safety Code, Chapter 382 (also known as the Texas Clean Air Act), and the Texas Water Code, which are cited in the STATUTORY AUTHORITY section of this preamble, including Texas Health and Safety Code, §§382.011, 382.012, and 382.017. Therefore, this adopted rulemaking action is not subject to the regulatory analysis provisions of Texas Government Code, §2001.0225(b).

The commission invited public comment regarding the Draft Regulatory Impact Analysis Determination during the public comment period. No comments were received regarding the regulatory impact analysis determination.

Takings Impact Assessment

Under Texas Government Code, §2007.002(5), taking means a governmental action that affects private real property, in whole or in part or temporarily or permanently, in a manner that requires the governmental entity to compensate the private real property owner as provided by the Fifth and Fourteenth Amendments to the United States Constitution or §17 or §19, Article I, Texas Constitution; or a governmental action that affects an owner's private real property that is the subject of the governmental action, in whole or in part or temporarily or permanently, in a manner that restricts or limits the owner's right to the property that would otherwise exist in the absence of the governmental action; and is the producing cause of a reduction of at least 25 percent in the market value of the affected private real property, determined by comparing the market value of the property as if the governmental action is not in effect and the market value of the property determined as if the governmental action is in effect. The commission completed a takings impact analysis for the adopted rulemaking action under the Texas Government Code, §2007.043.

The primary purpose of this adopted rulemaking, as discussed elsewhere in this preamble, is to meet federal requirements for the implementation of control strategies necessary to attain and maintain the NAAQS for ozone mandated by 42 USC, 7410, FCAA, §110, and required to be included in operating permits by 42 USC, §7661a, FCAA, §502. The adopted rule addresses RACT requirements for the Bexar County 2015 eight-hour ozone nonattainment area and the DFW 2008 eight-hour ozone nonattainment area as well as revisions to existing rules to remove specific monitoring requirements and adjust ammonia emission limits for certain engines as discussed elsewhere in this preamble.

States are required to adopt SIPs with enforceable emission limitations and other control measures, means, or techniques, as well as schedules and timetables for compliance, as may be necessary or appropriate to meet the applicable requirements of the FCAA. If a state does not comply with its obligations under 42 USC, §7410, FCAA, §110 to submit SIPs, states are subject to discretionary sanctions under 42 USC, §7410(m) or mandatory sanctions under 42 USC, §7509, FCAA, §179; as well as the imposition of a federal implementation plan (FIP) under 42 USC, §7410, FCAA, §110(c). Under 42 USC, §7661a, FCAA, §502, states are required to have federal operating permit programs that provide authority to issue permits and assure compliance with each applicable standard, regulation, or requirement under the FCAA, including enforceable emission limitations and other control measures, means, or techniques, which are required under 42 USC, §7410, FCAA, §110. Similar to requirements in 42 USC, §7410, FCAA, §110, regarding the requirement to adopt and implement plans to attain and maintain the national ambient air quality standards, states are not free to ignore requirements in 42 USC, §7661a, FCAA, §502 and must develop and submit programs to provide for operating permits for major sources that include all applicable requirements of the FCAA. Lastly, states are also subject to the imposition of sanctions under 42 USC, §7661a(d) and (i), FCAA, §502(d) and (i) for failure to submit an operating permits program, the disapproval of any operating permits program, or failure to adequately administer and enforce the approved operating permits program.

The adopted rules will not create any additional burden on private real property beyond what is required under federal law, as the adopted rules, if adopted by the commission and approved by EPA, will become federal law as part of the approved SIP required by 42 U.S.C. §7410, FCAA, §110. The adopted rules will not affect private real property in a manner that will require compensation to private real property owners under the United States Constitution or the Texas Constitution. The adoption also will not affect private real property in a manner that restricts or limits an owner's right to the property that will otherwise exist in the absence of the governmental action. Therefore, the adopted rulemaking will not cause a taking under Texas Government Code, Chapter 2007.

Consistency with the Coastal Management Program

The commission reviewed the adopted rulemaking and found that the adoption is subject to the Texas Coastal Management Program (CMP) in accordance with the Coastal Coordination Act, Texas Natural Resources Code, §§33.201 et seq., and therefore must be consistent with all applicable CMP goals and policies. The commission conducted a consistency determination for the adopted rules in accordance with Coastal Coordination Act Implementation Rules, 31 TAC §505.22 and found the adopted rulemaking is consistent with the applicable CMP goals and policies.

The adopted amendments are consistent with the applicable CMP goal expressed in 31 TAC §501.12(1) of protecting and preserving the quality and values of coastal natural resource areas, and the policy in 31 TAC §501.14(l), which requires that the commission protect air quality in coastal areas. The adopted rulemaking and SIP revision will ensure that the amendments comply with 40 CFR Part 50, National Primary and Secondary Air Quality Standards, and 40 CFR Part 51, Requirements for Preparation, Adoption, and Submittal of Implementation Plans.

The commission invited public comment regarding the consistency with the CMP during the public comment period. No comments were received regarding the CMP.

Effect on Sites Subject to the Federal Operating Permits Program

Chapter 117 is an applicable requirement under 30 TAC Chapter 122, Federal Operating Permits Program. If the adopted revisions to Chapter 117 are adopted, owners or operators subject to the federal operating permit program must, consistent with the revision process in Chapter 122, upon the effective date of the rulemaking, revise their operating permit to include the new Chapter 117 requirements.

Public Comment

The commission held public hearings in Houston on January 4, 2024, and in Arlington on January 11, 2024. The commission offered a public hearing in San Antonio on January 9, 2024. The comment period opened on December 1, 2023, and closed on January 16, 2024. The commission received comments from CPS Energy, EPA, Sierra Club, and Baker Botts LLP, on behalf of the Texas Industry Project (TIP). The comments expressed support for the proposal and provided suggested changes to the rules, including changes to the notification and reporting requirements, changes to the system cap for electric generation sources for shutdown units, and changes to the RACT limits for certain sources.

Any comments received regarding the Bexar County, DFW, and HGB attainment demonstration SIP revisions (Non-Rule Project Nos. 2023-107-SIP-NR, 2023-132-SIP-NR, and 2022-022-SIP-NR, respectively) are addressed in the Response to Comments portions of those attainment demonstration SIP revisions.

Response to Comments

Comment

CPS Energy supported the proposed §117.1105 NO_X rates in lb/MMBtu and supported the compliance mechanism of a system cap in proposed §117.1120.

Response

The commission appreciates the support.

Comment

CPS Energy requested changing the proposed reporting requirement for any exceedance of the system cap emission limit in §117.1120(f) from 48 hours to two business days. CPS Energy stated that its core compliance staff works Mondays through Thursdays on 10-hour shifts. Changing the requirement to two business days ensures those people responsible for reporting have sufficient time to report the exceedance. CPS Energy also requested changing the follow-up reporting time in proposed §117.1120(f) from 21 days to 60 days. CPS Energy stated that it has a very robust root cause analysis program, and 60 days would ensure the reports are properly investigated, developed, and reviewed.

Response

The commission agrees that the requested changes are reasonable and revised the rule. Adopted §117.1120(f) requires the owner or operator to report any exceedance of the system cap emission limit within three calendar days to the appropriate regional office. This change provides an additional day to accommodate the non-traditional work schedule. If an exceedance occurs on a Friday then the owner or operator is required to provide notice of the exceedance to the regional office by the end of the day Monday. The adopted rule was also revised to require the owner or operator to follow-up no later than 60 calendar days after the exceedance with a written report to the regional office that includes an analysis of the cause for the exceedance with appropriate data to demonstrate the amount of emissions in excess of the system cap and the necessary corrective actions taken by the company to assure future compliance. Since the system cap applies to multiple units located at multiple sites, the commission agrees that additional time may be needed to properly evaluate the cause of the exceedance. However, the commission expects the analysis of the exceedance to be prompt and the results to be provided as soon as practicable.

Comment

CPS Energy commented that 40 CFR Part 75 includes an exemption/waiver to the normal notification required to TCEQ if there are extraneous circumstances. CPS Energy requested that this option be incorporated into proposed §117.1145(a). CPS Energy stated that if it were to have a RATA fail, for example, CPS Energy would like to have the option to conduct another one immediately. Currently, RATA notifications are made ahead of the required time, but if an issue arises (e.g., the unit coming offline), the regional office is immediately notified of any date changes so the TCEQ can observe the test.

Response

The commission would not consider immediate retesting to be a new event that would require separate notification. After providing the initial written notification to the appropriate regional office, the owner or operator may elect to repeat a certification or recertification test immediately (without additional written notification) whenever the owner or operator has determined during the certification or recertification testing that a test was failed or must be stopped, or that a second test is necessary. The commission considers these multiple tests to be part of the same testing event. As mentioned in the comment, the owner or operator should communicate any schedule changes, including delays or extensions, to the TCEQ regional office to ensure TCEQ has the opportunity to observe the testing. In emergency situations, the owner or operator may contact the TCEQ regional office to request a waiver to this notification requirement. No changes have been made in response to this comment.

Comment

CPS Energy recommended revising proposed §117.1140(f)(2) to remove the condition "that fuel was combusted in the unit" from the calculation used to demonstrate compliance with the system cap. CPS Energy suggested that the rule should require a 30-day look back for all units in the CPS Energy generation fleet located in Bexar County regardless of whether they run or have fuel combusted (i.e., count zero values in the 30-day rolling average) to include non-operating days.

Response

TCEQ agrees with the commenters suggested change. The system cap option allows sources to reduce or stop operation in order to meet the applicable limit. Therefore, non-operating days should be included in the compliance demonstration. Adopted §117.1140(f)(2) has been revised to clarify that for any EGF complying with the system cap in §117.1120, the rolling 30-day average is calculated for each day and is the average of the total pounds of NO_X emissions per day from all EGFs included in the system cap for the preceding 30 days.

Comment

EPA commented that for the system cap option for EGUs, a permanently retired or decommissioned and rendered inoperable EGU may not be included in the system cap emission limit. EPA commented that its 2001 guidance document "Improving Air Quality with Economic Incentive Programs (EIPs)" Section 7.2(a), Fundamental integrity elements, states "The terms surplus, quantifiable, enforceable, and permanent refer to the fundamental integrity elements that apply to emission reductions that qualify for inclusion in your emission averaging EIP. In emission averaging EIPs, the source-specific fundamental elements of surplus, enforceable, quantifiable, and permanent, as used with reference to the actions of the individual sources participating in the EIP, have special meanings..." Stationary-source shutdowns and production activity curtailments are not eligible as emission reductions".

Response

The system cap option in §117.1120 is not a type of emission averaging program, it is a source-specific emission cap program as described in Section 7.3 of the EPA's EIP guidance referenced in EPA's comment. EPA's guidance describes a source-specific emissions cap as an emission trading EIP that allows a specified stationary source or a limited group of sources that are subject to a rate-based emission limit to meet that requirement by accepting a mass-based emission limit, or cap, rather than complying directly with a rate-based limit. The system cap option in §117.1120 is a mass-based limit (in pounds per day) that takes the summation of multiple units in one electric power generating system to demonstrate compliance with rate-based RACT limits. The system cap includes all applicable units owned by one entity (e.g., an electric cooperative or municipality) within the Bexar County nonattainment area. Unlike an emission averaging program that applies to multiple sources across different sites, a source-specific emission cap program does allow shutdowns and curtailments to be included as reductions, so long as the unit being retired was originally included in the system cap program. EPA's guidance includes additional considerations to prevent a shutdown from merely shifting emissions elsewhere. The system cap in §117.1120 complies with the guidance for source-specific emission cap programs because a unit that is permanently retired or decommissioned and rendered inoperable may be included in the system cap only if the permanent shutdown occurred on or after the January 1, 2025, RACT compliance date. The rule also contains an additional limitation that prevents a facility from using a shutdown that is relied on for NSR netting or offsets from being included in the system cap. For these reasons, the Bexar County system cap in §117.1120 complies with EPA guidance. No changes were made in response to this comment.

Comment

TIP commented that it supports the TCEQ's proposed revisions to address its March 13, 2023, Petition for Rulemaking, which highlighted that Tier 4 engines are not manufactured with pre-installed CEMS because they are designed and manufactured with tamper-resistant controls to meet federal NO_X emission limits as set forth in 40 CFR Part 1039, Subpart B. Tier 4 engines are certified by manufacturers and rely on SCR systems which use a chemical reagent, such as ammonia, to meet federal standards. The same tamper-resistant design also ensures that ammonia emissions associated with SCR systems are controlled. TIP commented that the proposed rulemaking thus appropriately exempts Tier 4 engines from NO_X and ammonia monitoring requirements under Chapter 117 based on meeting certain criteria. TIP stated that the proposed rulemaking also properly adjusts the applicable ammonia emission limit to be consistent with other equipment with higher oxygen operation levels in exhaust gas. TIP stated that if finalized, the proposed rulemaking would align state rules with the federal Tier 4 engine standards, which preclude tampering or alteration, and therefore, as noted in the agency's preamble, provide reasonable assurance of compliance with the applicable NO_X and ammonia specifications.

Response

The TCEQ appreciates the support.

Comment

Sierra Club pointed to more stringent NO_X controls in other regions and recommended that TCEQ adopt similar RACT standards for Bexar County. EPA commented that TCEQ should evaluate RACT at lower than the proposed emission rates that are approved as RACT elsewhere in Texas nonattainment areas. Specifically, EPA commented that TCEQ should evaluate the following: (a) coal-fired EGUs with SCR at a rate lower than 0.069 lb/MMBtu since the J.K. Spruce 1 unit regularly operates at rates less than 0.069 lb/MMBtu, and the Emissions Specifications for Attainment Demonstration (ESAD) rate for the same source type in the HGB nonattainment area is 0.05 lb/MMBtu; (b) coal-fired EGUs without SCR for the implementation of both selective noncatalytic reduction and SCR since the J.K. Spruce 2 unit regularly operates at rates less than 0.2 lb/MMBtu, and the ESAD rate for the same source type in the HGB nonattainment area is 0.045 lb/MMBtu; and (c) gas-fired EGUs at emission rates lower than the proposed 0.20 lb/MMBtu since the DFW and HGB nonattainment areas have lower emission rates in place for the same source type.

Response

The Bexar County RACT determination does not need to set the lowest emission limit found elsewhere as RACT, but rather evaluate limits for technical feasibility and economic reasonableness for stationary sources in Bexar County.

TCEQ sets two tiers of emission limits. One for RACT and another that is beyond RACT. For NO_X, the beyond RACT tier is in sections of 30 TAC Chapter 117 with a title including "for Attainment Demonstration" and the RACT limits are in sections titled "Emission Specifications for Reasonably Available Control Technology (RACT)". EPA appears to confuse EGU RACT limits with ESAD limits. TCEQ is adopting RACT limits for EGUs in Bexar County that are equal to or more stringent than RACT limits on the same source categories in the HGB area, the only Texas nonattainment area with RACT emission limits on EGUs (30 TAC §117.1205).

For instance, the EGU RACT limit in HGB is 0.38 lb/MMBtu for tangential-fired units and 0.43 lb/MMBtu for wall-fired. The 0.05 lb/MMBtu limit that EPA cited is the ESAD limit in HGB for tangential-fired units. The 0.069 lb/MMBtu limit for coal-fired EGUs with SCR in Bexar County is less than the RACT limit in HGB. The 0.2 lb/MMBtu RACT limit for coal-fired EGUs without SCR in Bexar County is less than the comparable RACT limit in HGB. The gas-fired EGU boiler RACT limit in HGB is the same 0.20 lb/MMBtu limit applied in Bexar County.

No changes were made in response to this comment.

Comment

Sierra Club asserted that installing SCR technology on coal-fired power plants such as J.K. Spruce Unit 1 is economically and technologically feasible due to widespread use, inclusion in other state and EPA regulations, and based on a modeling study report conducted by Sonoma Technology and submitted with the comment.

Response

The commission evaluated RACT for the Bexar County RACT SIP revision (Non-Rule Project No. 2023-107-SIP-NR) based on the 2015 eight-hour ozone standard SIP requirements rule (83 FR 62998). TCEQ considered economic and technological feasibility in its RACT determination and chose not to declare installing SCR to be RACT for J.K. Spruce Unit 1 for this Bexar County RACT SIP revision. The commission calculated the cost of installation of an SCR system capable of removing 90% of the NO_X on J.K. Spruce Unit 1 as $36,078/ton of NO_X removed. The commission concludes that installation of SCR technology on J.K. Spruce Unit 1 is economically infeasible at this time and is therefore not RACT for this unit. No changes were made in response to this comment.

Comment

Sierra Club suggested setting NO_X RACT limits for coal-fired EGU units with SCR such as J. K. Spruce Unit 2 aligned with the SCR system's full potential usage based on manufacturer guidelines and good engineering practices. Sierra Club recommended setting the RACT limit at 0.03 lb/MMBtu because it is the lowest rate achieved over the period October 2017 to October 2022.

Response

The commission evaluated RACT based on the 2015 eight-hour ozone standard SIP requirements rule (83 FR 62998). TCEQ considers economic and technological feasibility in its RACT determination. The 0.069 lb/MMBtu emission limit for J.K. Spruce Unit 2, an EGU boiler fired on coal and controlled by SCR, is the level set in its EPA-approved permit and measured as a 30-day rolling average. The commission also contends that an emission limit cannot be set at the lowest level a unit has ever achieved in any 30-day period, as commenters suggest, but must be set at a value the unit can achieve in all 30-day periods. In its comment, Sierra Club included a table showing that during the October 2017 to October 2022 period, J. K. Spruce Unit 2 emitted between 0.031 and 0.069 lb/MMBtu. This shows that the RACT limit of 0.069 lb/MMBtu is technologically feasible for all 30-day periods analyzed. No changes were made in response to this comment.

SUBCHAPTER A. DEFINITIONS

30 TAC §117.10

Statutory Authority

The amendments are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; and THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air.

The adopted amendments implement TWC, §§5.102, 5.103, 5.105 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.017.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401773

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

DIVISION 2. BEXAR COUNTY OZONE NONATTAINMENT AREA MAJOR SOURCES

30 TAC §§117.200, 117.203, 117.205, 117.230, 117.235, 117.240, 117.245, 117.252

Statutory Authority

The new rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The new rules are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted new rules implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§117.203.Exemptions.

The following units are exempt from this division, except as specified in §§117.240(f), 117.245(f)(4) and (9), and 117.252 of this title (relating to Continuous Demonstration of Compliance; Notification, Recordkeeping, and Reporting Requirements; and Control Plan Procedures for Reasonably Available Control Technology (RACT)):

(1) stationary gas turbines and gas-fired lean-burn stationary reciprocating internal combustion engines that are used as follows:

(A) in research and testing of the unit;

(B) for purposes of performance verification and testing of the unit;

(C) solely to power other gas turbines or engines during startups;

(D) exclusively in emergency situations, except that operation for testing or maintenance purposes of the gas turbine or engine is allowed for up to 100 hours per year, based on a rolling 12-month basis; or

(E) in response to and during the existence of any officially declared disaster or state of emergency;

(2) gas-fired lean-burn stationary reciprocating internal combustion engines with a horsepower (hp) rating less than 50 hp;

(3) stationary gas turbines with a maximum rated capacity less than 10.0 million British thermal units per hour; and

(4) units located at a major source that is subject to Subchapter C, Division 2 of this chapter (related to Bexar County Ozone Nonattainment Area Utility Electric Generation Sources).

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401774

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

30 TAC §117.310, §117.340

Statutory Authority

The amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401775

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

30 TAC §117.410, §117.440

Statutory Authority

The amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401776

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

DIVISION 2. BEXAR COUNTY OZONE NONATTAINMENT AREA UTILITY ELECTRIC GENERATION SOURCES

30 TAC §§117.1100, 117.1103, 117.1105, 117.1120, 117.1140, 117.1145, 117.1152

Statutory Authority

The new rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The new rules are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted new rules implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

§117.1120.System Cap.

(a) An owner or operator of an electric generating facility (EGF), as defined in §117.10 of this title (relating to Definitions), may achieve compliance with the nitrogen oxides (NO_X) emission specifications in §117.1105 of this title (relating to Emission Specifications for Reasonably Available Control Technology (RACT)) by achieving equivalent NO_X emission reductions obtained by compliance with a system cap emission limitation in accordance with the requirements of this section.

(b) Each EGF within an electric power generating system, as defined in §117.10 of this title, that started operation before January 1, 2025, and is subject to §117.1105 of this title, must be included in the system cap.

(c) The system cap must be calculated using the following equation.

Figure: 30 TAC §117.1120(c) (.pdf)

(d) Continuous compliance with the system cap must be demonstrated in accordance with the requirements in §117.1140 of this title (relating to Demonstration of Compliance).

(e) The owner or operator shall maintain daily records indicating the NO_X emissions and fuel usage from each EGF and summations of total NO_X emissions and fuel usage for all EGFs under the system cap on a daily basis. Records must also be retained in accordance with §117.1145 of this title (relating to Notification, Recordkeeping, and Reporting Requirements).

(f) The owner or operator shall report any exceedance of the system cap emission limit within three calendar days to the appropriate regional office. The owner or operator shall then follow up no later than 60 calendar days after the exceedance with a written report to the regional office that includes an analysis of the cause for the exceedance with appropriate data to demonstrate the amount of emissions in excess of the system cap and the necessary corrective actions taken by the company to assure future compliance. Additionally, the owner or operator shall submit semiannual reports for the monitoring systems in accordance with §117.1145 of this title.

(g) The owner or operator shall demonstrate compliance with the system cap in accordance with the schedule specified in §117.9110 of this title (relating to Compliance Schedule for Bexar County Ozone Nonattainment Area Utility Electric Generation Sources).

(h) An EGF that is permanently retired or decommissioned and rendered inoperable may be included in the system cap emission limit provided that the permanent shutdown occurred on or after January 1, 2025.

(i) Emission reductions from shutdowns or curtailments that have been used for netting or offset purposes under the requirements of Chapter 116 of this title (relating to Control of Air Pollution by Permits for New Construction or Modification) may not be included in the in the calculation of the system cap in subsection (c) of the section.

(j) For the purposes of determining compliance with the system cap, the contribution of each affected EGF that is operating during a startup, shutdown, or emissions event as defined in §101.1 of this title (relating to Definitions) must be calculated from the NO_X emission rate measured by the NO_X monitor, if the monitor is operating properly. If the NO_X monitor is not operating properly, the substitute data procedures identified in §117.1140 of this title must be used.

(k) Emission credits may be used in accordance with the requirements of §117.9800 of this title (relating to Use of Emission Credits for Compliance) to exceed the system cap.

§117.1140.Demonstration of Compliance.

(a) Nitrogen oxides (NO_X) monitoring. The owner or operator of each unit subject to the emission specifications in §117.1105 of this title (relating to Emission Specifications for Reasonably Available Control Technology (RACT)), shall install, calibrate, maintain, and operate a continuous emissions monitoring system (CEMS) or predictive emissions monitoring system (PEMS) to measure NO_X on an individual basis.

(1) Each CEMS or PEMS is subject to the relative accuracy test audit relative accuracy requirements of 40 Code of Federal Regulations (CFR) Part 75, Appendix B, Figure 2, except the concentration options (parts per million by volume (ppmv) and pound per million British thermal units (lb/MMBtu)) do not apply. Each CEMS or PEMS must meet either the relative accuracy percent requirement of 40 CFR Part 75, Appendix B, Figure 2, or an alternative relative accuracy requirement of ± 2.0 ppmv from the reference method mean value.

(2) Each CEMS or PEMS is subject to the requirements of §117.8110 of this title (relating to Emission Monitoring System Requirements for Utility Electric Generation Sources).

(3) Each PEMS must predict NO_X emissions in the units of the applicable emission limitations of this division and PEMS and fuel flow meters must be used to demonstrate continuous compliance with the emission specifications of this division.

(b) Acid rain peaking units. In lieu of the NO_X monitoring requirements in subsection (a) of this section, the owner or operator of each peaking unit as defined in 40 CFR §72.2, may monitor operating parameters for each unit in accordance with 40 CFR Part 75, Appendix E, and calculate NO_X emission rates based on those procedures.

(c) Totalizing fuel flow meters. The owner or operator of each unit subject to the emission specifications in §117.1105 of this title and each unit using the exemption in §117.1103(1) of this title (relating to Exemptions) shall install, calibrate, maintain, and operate totalizing fuel flow meters to individually and continuously measure the gas and liquid fuel usage. A computer that collects, sums, and stores electronic data from continuous fuel flow meters is an acceptable totalizer. In lieu of installing a totalizing fuel flow meter on a unit, an owner or operator may opt to assume fuel consumption at maximum design fuel flow rates during hours of the unit's operation.

(d) Run time meters. The owner or operator of a unit using the exemption of §117.1103(2) of this title shall record the operating time hours with an elapsed run time meter.

(e) Loss of exemption. The owner or operator of any unit claimed exempt from the emission specifications of this division using the exemptions in §117.1103(1) or (2) of this title, shall notify the executive director within seven days if the applicable limit is exceeded.

(1) If the limit is exceeded, the exemption from the emission specifications of this division is permanently withdrawn.

(2) Within 90 days after loss of the exemption, the owner or operator shall submit a compliance plan detailing a plan to meet the applicable compliance limit as soon as possible, but no later than 24 months after exceeding the limit. The plan must include a schedule of increments of progress for the installation of the required control equipment.

(3) The schedule is subject to the review and approval of the executive director.

(f) Data used for compliance. The methods required in this section must be used to demonstrate compliance with the emission specifications of §117.1105 of this title and the system cap in §117.1120 of this title (relating to System Cap). For enforcement purposes, the executive director may also use other commission compliance methods to determine whether the unit is in compliance with applicable emission specifications.

(1) For units complying with the NO_X emission specifications of §117.1105 of this title in pounds per million British thermal units (lb/MMBtu) on a rolling 30-day average basis, the rolling 30-day average is calculated for each day that fuel was combusted in the unit, and is the total NO_X emissions (in pounds) from the unit for the preceding 30 days that fuel was combusted in the unit, divided by the total heat input (in MMBtu) for the unit during the same 30-day period.

(2) For any electric generating facility (EGF) complying with the system cap in §117.1120 of this title (relating to System Cap) in pounds per day on a rolling 30-day average basis, the rolling 30-day average is calculated for each day and is the average of the total pounds of NO_X emissions per day from all EGFs included in the system cap for the preceding 30 days.

(g) Data Substitution. The missing data procedures specified in 40 CFR Part 75, Subpart D (Missing Data Substitution Procedures) must be used to provide substitute emissions compliance data during periods when the NO_X monitor is off-line except as follows.

(1) A peaking unit, as defined in 40 CFR §72.2, subject to 40 CFR Part 75, Appendix E, may use the missing data procedures specified in 40 CFR Part 75, Appendix E, §2.5 (Missing Data Procedures).

(2) A PEMS for units not subject to the requirements of 40 CFR Part 75 may use calculations in accordance with §117.8110(b) of this title (relating to Emission Monitoring System Requirements for Utility Electric Generation Sources).

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401777

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

DIVISION 1. HOUSTON-GALVESTON-BRAZORIA OZONE NONATTAINMENT AREA MINOR SOURCES

30 TAC §117.2010, §117.2035

Statutory Authority

The amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401778

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

30 TAC §117.2110, §117.2135

Statutory Authority

The amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401779

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

DIVISION 1. UTILITY ELECTRIC GENERATION IN EAST AND CENTRAL TEXAS

30 TAC §117.3000

Statutory Authority

The amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401780

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

30 TAC §§117.3103, 117.3110, 117.3120, 117.3124, 117.3145

Statutory Authority

The new and amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The new and amended rules are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted new and amended rules implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401781

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

DIVISION 1. COMPLIANCE SCHEDULES

30 TAC §§117.9010, 117.9030, 117.9110, 117.9300, 117.9320

Statutory Authority

The new and amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The new and amended rules are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted new and amended rules implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401782

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087

30 TAC §117.9800

Statutory Authority

The amended rules are adopted under Texas Water Code (TWC), §5.102, concerning general powers; §5.103, concerning Rules; TWC, §5.105, concerning General Policy, which authorize the commission to adopt rules necessary to carry out its powers and duties under the TWC; TWC, §7.002, concerning Enforcement Authority, which authorizes the commission to enforce the provisions of the Water Code and the Health and Safety Code within the commission's jurisdiction; and under Texas Health and Safety Code (THSC), §382.017, concerning Rules, which authorizes the commission to adopt rules consistent with the policy and purpose of the Texas Clean Air Act.

The amendments are also adopted under THSC, §382.002, concerning Policy and Purpose, which establishes the commission's purpose to safeguard the state's air resources, consistent with the protection of public health, general welfare, and physical property; THSC, §382.011, concerning General Powers and Duties, which authorizes the commission to control the quality of the state's air; THSC, §382.012, concerning the State Air Control Plan, which authorizes the commission to prepare and develop a general, comprehensive plan for the proper control of the state's air; THSC, §382.016, concerning Monitoring Requirements; Examination of Records, which authorizes the commission to prescribe reasonable requirements for measuring and monitoring the emissions of air contaminants; and THSC, §382.021, concerning Sampling Methods and Procedures.

The adopted amendments implement TWC, §§5.102, 5.103 and 7.002; and THSC, §§382.002, 382.011, 382.012, 382.016, 382.017, and 382.021.

The agency certifies that legal counsel has reviewed the adoption and found it to be a valid exercise of the agency's legal authority.

Filed with the Office of the Secretary of State on April 26, 2024.

TRD-202401783

Charmaine Backens

Deputy Director, Environmental Law Division

Texas Commission on Environmental Quality

Effective date: May 16, 2024

Proposal publication date: December 15, 2023

For further information, please call: (512) 239-6087