Appendix C to 40 CFR Part 63-Determination of the Fraction Biodegraded (Fbio) in a Biological Treatment Unit

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This action proposes amendments to appendix C to 40 CFR part 63. Appendix C defines the procedures for an owner or operator of a facility that generates wastewater to calculate the site-specific fraction of organic compounds biodegraded (F bio ) in a biological treatment unit. The proposed amendments to Appendix C would add a non-speciated test procedure to the batch test procedures for use in demonstrating compliance with wastewater rules that regulate volatile organic compounds (VOC), such as the synthetic organic chemical manufacturing industry (SOCMI) Wastewater new source performance standards (NSPS). The proposed amendments would also make minor editorial changes throughout appendix C.