(a) For the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, compliance with §115.131(a), §115.132(a), and §115.137 of this title (relating to Emission Specifications; Control Requirements; and Exemptions) shall be determined by applying the following test methods, as appropriate:(1) Test Methods 1-4 (40 Code of Federal Regulations 60, Appendix A) for determining flow rate, as necessary;(2) Test Method 18 (40 Code of Federal Regulations 60, Appendix A) for determining gaseous organic compound emissions by gas chromatography;(3) Test Method 25 (40 Code of Federal Regulations 60, Appendix A) for determining total gaseous nonmethane organic emissions as carbon;(4) Test Methods 25A or 25B (40 Code of Federal Regulations 60, Appendix A) for determining total gaseous organic concentrations using flame ionization or nondispersive infrared analysis;(5) determination of true vapor pressure at actual storage temperature using American Society for Testing Materials (ASTM) Test Methods D323-89, D2879, D4953, D5190, or D5191; using API Publication 2517, Third Edition, 1989 or standard reference texts to convert from Reid vapor pressure to true vapor pressure, where applicable; or(6) minor modifications to these test methods approved by the executive director.(b) For Gregg, Nueces, and Victoria Counties, compliance with §115.131(b), §115.132(b), and §115.137(b) of this title shall be determined by applying the following test methods, as appropriate:(1) Test Methods 1-4 (40 Code of Federal Regulations 60, Appendix A) for determining flow rate as necessary;(2) Test Method 18 (40 Code of Federal Regulations 60, Appendix A) for determining gaseous organic compound emissions by gas chromatography;(3) Test Method 25 (40 Code of Federal Regulations 60, Appendix A) for determining total gaseous nonmethane organic emissions as carbon;(4) Test Methods 25A or 25B (40 Code of Federal Regulations 60, Appendix A) for determining total gaseous organic concentrations using flame ionization or nondispersive infrared analysis;(5) determination of true vapor pressure at actual storage temperature using ASTM Test Methods D323-89, D2879, D4953, D5190, or D5191; and using API Publication 2517, Third Edition, 1989 or standard reference texts to convert from Reid vapor pressure to true vapor pressure, where applicable; or(6) minor modifications to these test methods approved by the executive director.