U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 31, 2025

All TitlesTitle 40Chapter IPart 63Subpart G - Subpart G—National Emission Standards for Hazardous Air Pollutants From the Synthetic Organic Chemical Manufacturing Industry for Process Vents, Storage Vessels, Transfer Operations, and Wastewater
§ 63.110 - Applicability.
§ 63.111 - Definitions.
§ 63.112 - Emission standard.
§ 63.113 - Process vent provisions—reference control technology.
§ 63.114 - Process vent provisions—monitoring requirements.
§ 63.115 - Process vent provisions—methods and procedures for process vent group determination.
§ 63.116 - Process vent provisions—performance test methods and procedures to determine compliance.
§ 63.117 - Process vent provisions—reporting and recordkeeping requirements for group and TRE determinations and performance tests.
§ 63.118 - Process vent provisions—periodic reporting and recordkeeping requirements.
§ 63.119 - Storage vessel provisions—reference control technology.
§ 63.120 - Storage vessel provisions—procedures to determine compliance.
§ 63.121 - Storage vessel provisions—alternative means of emission limitation.
§ 63.122 - Storage vessel provisions—reporting.
§ 63.123 - Storage vessel provisions—recordkeeping.
§ 63.124 - Process vents and storage vessels that are in ethylene oxide service—procedures to determine compliance.
§ 63.125 - [Reserved]
§ 63.126 - Transfer operations provisions—reference control technology.
§ 63.127 - Transfer operations provisions—monitoring requirements.
§ 63.128 - Transfer operations provisions—test methods and procedures.
§ 63.129 - Transfer operations provisions—reporting and recordkeeping for performance tests and notification of compliance status.
§ 63.130 - Transfer operations provisions—periodic recordkeeping and reporting.
§ 63.131 - [Reserved]
§ 63.132 - Process wastewater provisions—general.
§ 63.133 - Process wastewater provisions—wastewater tanks.
§ 63.134 - Process wastewater provisions—surface impoundments.
§ 63.135 - Process wastewater provisions—containers.
§ 63.136 - Process wastewater provisions—individual drain systems.
§ 63.137 - Process wastewater provisions—oil-water separators.
§ 63.138 - Process wastewater provisions—performance standards for treatment processes managing Group 1 wastewater streams and/or residuals removed from Group 1 wastewater streams.
§ 63.139 - Process wastewater provisions—control devices.
§ 63.140 - Process wastewater provisions—delay of repair.
§§ 63.141-63.142 - §[Reserved]
§ 63.143 - Process wastewater provisions—inspections and monitoring of operations.
§ 63.144 - Process wastewater provisions—test methods and procedures for determining applicability and Group 1/Group 2 determinations (determining which wastewater streams require control).
§ 63.145 - Process wastewater provisions—test methods and procedures to determine compliance.
§ 63.146 - Process wastewater provisions—reporting.
§ 63.147 - Process wastewater provisions—recordkeeping.
§ 63.148 - Leak inspection provisions.
§ 63.149 - Control requirements for certain liquid streams in open systems within a chemical manufacturing process unit.
§ 63.150 - Emissions averaging provisions.
§ 63.151 - Initial notification.
§ 63.152 - General reporting and continuous records.
§ 63.153 - Implementation and enforcement.
Appendix - Table 1 to Subpart G of Part 63—Process Vents—Coefficients for Total Resource Effectiveness for Existing Source Nonhalogenated and Halogenated Vent Streams
Appendix - Table 1A to Subpart G of Part 63—Applicable 40 CFR Part 63 General Provisions
Appendix - Table 2 to Subpart G of Part 63—Process Vents—Coefficients for Total Resource Effectiveness for New Source Nonhalogenated and Halogenated Vent Streams
Appendix - Table 3 to Subpart G of Part 63—Process Vents—Process Vents—Monitoring, Recordkeeping, and Reporting Requirements for Control Devices and Recapture Devices
Appendix - Table 4 to Subpart G of Part 63—Process Vents—Monitoring, Recordkeeping, and Reporting Requirements for Maintaining a TRE Index Value >1.0 and. ≤4.0 [No Longer Applicable in Accordance With § 63.113(a)(4)]
Appendix -
Appendix - Table 6 to Subpart G of Part 63—Group 1 Storage Vessels at New Sources
Appendix - Table 7 to Subpart G of Part 63—Transfer Operations—Monitoring, Recordkeeping, and Reporting Requirements for Complying With 98 Weight-Percent Reduction of Total Organic Hazardous Air Pollutants Emissions or a Limit of 20 Parts per Million by Volume
Appendix - Table 8 to Subpart G of Part 63—Organic HAP's Subject to the Wastewater Provisions for Process Units at New Sources
Appendix - Table 9 to Subpart G of Part 63—Organic HAP's Subject to the Wastewater Provisions for Process Units at New and Existing Sources and Corresponding Fraction Removed (Fr) Values
Appendix - Table 10 to Subpart G of Part 63—Wastewater—Compliance Options for Wastewater Tanks
Appendix - Table 11 to Subpart G of Part 63—Wastewater—Inspection and Monitoring Requirements for Waste Management Units
Appendix - Table 12 to Subpart G of Part 63—Monitoring Requirements for Treatment Processes
Appendix - Table 13 to Subpart G of Part 63—Wastewater—Monitoring Requirements for Control Devices
Appendix - Tables 14-14b to Subpart G of Part 63 [Reserved]
Appendix - Table 15 to Subpart G of Part 63—Wastewater—Information on Table 8 and/or Table 9 Compounds To Be Submitted With Notification of Compliance Status for Process Units at New and/or Existing Sources a b
Appendix - Table 16 to Subpart G of Part 63 [Reserved]
Appendix - Table 17 to Subpart G of Part 63—Information for Treatment Processes To Be Submitted With Notification of Compliance Status a b
Appendix - Table 18 to Subpart G of Part 63—Information for Waste Management Units To Be Submitted With Notification of Compliance Status a b
Appendix - Table 19 to Subpart G of Part 63—Wastewater—Information on Residuals To Be Submitted With Notification of Compliance Status a b
Appendix - Table 20 to Subpart G of Part 63—Wastewater—Periodic Reporting Requirements for Control Devices Subject to § 63.139 Used To Comply With §§ 63.13 Through 63.139
Appendix - Table 21 to Subpart G of Part 63—Average Storage Temperature (Ts) as a Function of Tank Paint Color
Appendix - Table 22 to Subpart G of Part 63—Paint Factors for Fixed Roof Tanks
Appendix - Table 23 to Subpart G of Part 63—Average Clingage Factors (c) a
Appendix - Table 24 to Subpart G of Part 63—Typical Number of Columns as a Function of Tank Diameter for Internal Floating Roof Tanks With Column Supported Fixed Roofs a
Appendix - Table 25 to Subpart G of Part 63—Effective Column Diameter (Fc)
Appendix - Table 26 to Subpart G of Part 63—Seal Related Factors for Internal Floating Roof Vessels
Appendix - Table 27 to Subpart G of Part 63—Summary of Internal Floating Deck Fitting Loss Factors (KF) and Typical Number of Fittings (NF)
Appendix - Table 28 to Subpart G of Part 63—Deck Seam Length Factors a (SD) for Internal Floating Roof Tanks
Appendix - Table 29 to Subpart G of Part 63—Seal Related Factors for External Floating Roof Vessels
Appendix - Table 30 to Subpart G of Part 63—Roof Fitting Loss Factors, KFa, KFb, and m, a and Typical Number of Fittings, NT
Appendix - Table 31 to Subpart G of Part 63—Typical Number of Vacuum Breakers, NF6 and Roof Drains, a NF7
Appendix - Table 32 to Subpart G of Part 63—Typical Number of Roof Legs, a NF8
Appendix - Table 33 to Subpart G of Part 63—Saturation Factors
Appendix - Table 34 to Subpart G of Part 63—Fraction Measured (Fm) and Fraction Emitted (Fe) For HAP Compounds in Wastewater Streams
Appendix - Table 35 to Subpart G of Part 63—Control Requirements for Items of Equipment That Meet the Criteria of § 63.149 of Subpart G
Appendix - Table 36 to Subpart G of Part 63—Compound Lists Used for Compliance Demonstrations for Enhanced Biological Treatment Processes (See § 63.145(h))
Appendix - Table 37 to Subpart G of Part 63—Default Biorates for List 1 Compounds
Appendix - Table 38 to Subpart G of Part 63—Toxic Equivalency Factors
Appendix - Figure 1 to Subpart G of Part 63—Definitions of Terms Used in Wastewater Equations
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