Compliance with the emission specifications, vapor control system efficiency, and certain control requirements, inspection requirements, and exemption criteria of §§115.142 - 115.144 and 115.147 of this title (relating to Control Requirements; Alternate Control Requirements; Inspection and Monitoring Requirements; and Exemptions) shall be determined by applying one or more of the following test methods and procedures, as appropriate.
  (1) Gas flow rate. Test Methods 1-4 (40 Code of Federal Regulations (CFR) Part 60, Appendix A) are used for determining gas flow rates, as necessary.
  (2) Concentration of Volatile Organic Compounds (VOC).
    (A) Test Method 18 (40 CFR Part 60, Appendix A) is used for determining gaseous organic compound emissions by gas chromatography.
    (B) Test Method 25 (40 CFR 60, Appendix A) is used for determining total gaseous nonmethane organic emissions as carbon.
    (C) Test Methods 25A or 25B (40 CFR 60, Appendix A) are used for determining total gaseous organic concentrations using flame ionization or nondispersive infrared analysis.
  (3) Performance requirements for flares and vapor combustors.
    (A) For flares, the performance test requirements of 40 CFR 60.18(b) shall apply.
    (B) For vapor combustors, the owner or operator may consider the unit to be a flare and meet the performance test requirements of 40 CFR 60.18(b) rather than the procedures of paragraphs (1) and (2) of this section.
    (C) Compliance with the requirements of 40 CFR 60.18(b) will be considered to represent 98% control of the VOC in the flare inlet.
  (4) Vapor pressure. Use standard reference texts or American Society for Testing and Materials (ASTM) Test Methods D323-89, D2879, D4953, D5190, or D5191 for the measurement of vapor pressure, adjusted for actual storage temperature in accordance with American Petroleum Institute Publication 2517, Third Edition, 1989.
  (5) Leak determination by instrument method. Use Test Method 21 (40 CFR 60, Appendix A) for determining VOC leaks and for monitoring a carbon canister in accordance with §115.144(3)(D) of this title.
  (6) Determination of VOC concentration of wastewater samples. Use Test Method 5030 (purge and trap) followed by Test Method 8015 with a DB-5 boiling point (or equivalent column), and flame ionization detector, with the detector calibrated with benzene (SW-846 and 40 CFR Part 261); Test Methods 3810, 5030 (followed by 8020), 8240, 8260, and 9060 (SW-846 and 40 CFR Part 261); Test Methods 602 and 624 (40 CFR Part 136); Test Method 5310(B) (Standard Methods 17th Edition); or Test Method 25D (40 CFR Part 60, Appendix A).
  (7) Determination of total suspended solids. Use Method 160.2 (Methods for Chemical Analysis of Water and Wastes, EPA-600/4-79-020) or Method 2540D (Standard Methods for the Examination of Water and Wastewater, 18th Edition, American Public Health Association).
  (8) Determination of biotreatment unit efficiency. Use the methods found in 40 CFR 63 Appendix C or 40 CFR 63.145. A stream-specific list of VOCs shall be used and is determined as follows:
    (A) compounds with concentrations below one part per million by weight (ppmw) or below the lower detection limit may be excluded;
    (B) for the owner or operator that can identify at least 90% by weight of the VOCs in the wastewater stream, the individual VOCs that are 5.0% by weight or greater are required to be included on the list. If less than half of the total VOCs in the wastewater are represented by the compounds that are 5.0% by weight or greater, the owner or operator shall include those individual VOCs with the greatest mass on the stream-specific list of VOCs until 75 compounds or every compound, whichever is fewer, is included on the list, except as provided by subparagraph (A) of this paragraph. The owner or operator shall document that the site-specific list of VOCs is representative of the process wastewater stream; and
    (C) for the owner or operator that can identify at least 50% by weight of the VOCs in the wastewater stream, the individual VOCs with the greatest mass on the stream-specific list of VOCs up to 75 compounds or every compound, whichever is fewer, shall be included on the list, except as provided by subparagraph (A) of this paragraph. The owner or operator shall document that the site-specific list of VOCs is representative of the process wastewater stream.
  (9) Minor modifications. Minor modifications to these test methods may be used, if approved by the executive director.
  (10) Alternate test methods. Test methods other than those specified in paragraphs (1) - (8) of this section may be used if validated by 40 CFR 63, Appendix A, Test Method 301 (effective December 29, 1992). For the purposes of this paragraph, substitute "executive director" each place that Test Method 301 references "administrator."

Source Note: The provisions of this §115.145 adopted to be effective May 27, 1994, 19 TexReg 3703; amended to be effective November 18, 1999, 24 TexReg 10095; amended to be effective May 16, 2002, 27 TexReg 4113