--- kind: "range" citation: "40 C.F.R. §§ 63.764–63.771" title: "40" from: "63.764" to: "63.771" count: 7 url: "https://uscodex.org/cfr/40/63.764..63.771" --- # §63.764. General standards. - (a) Table 2 of this subpart specifies the provisions of [subpart A](/cfr/40/subpartA.md) (General Provisions) of this part that apply and those that do not apply to owners and operators of affected sources subject to this subpart. - (b) All reports required under this subpart shall be sent to the Administrator at the appropriate address listed in [§ 63.13](/cfr/40/63.13.md). Reports may be submitted on electronic media. - (c) Except as specified in [paragraph (e)](#e) of this section, the owner or operator of an affected source located at an existing or new major source of HAP emissions shall comply with the standards in this subpart as specified in [paragraphs (c)(1) through (3)](#c-1..c-3) of this section. - (1) For each glycol dehydration unit process vent subject to this subpart, the owner or operator shall comply with the requirements specified in [paragraphs (c)(1)(i) through (iii)](#c-1-i..c-1-iii) of this section. - (i) The owner or operator shall comply with the control requirements for glycol dehydration unit process vents specified in [§ 63.765](/cfr/40/63.765.md); - (ii) The owner or operator shall comply with the monitoring requirements specified in [§ 63.773](/cfr/40/63.773.md); and - (iii) The owner or operator shall comply with the recordkeeping and reporting requirements specified in §§ [63.774](/cfr/40/63.774.md) and [63.775](/cfr/40/63.775.md). - (2) For each storage vessel with the potential for flash emissions subject to this subpart, the owner or operator shall comply with the requirements specified in [paragraphs (c)(2)(i) through (iii)](#c-2-i..c-2-iii) of this section. - (i) The control requirements for storage vessels specified in [§ 63.766](/cfr/40/63.766.md); - (ii) The monitoring requirements specified in [§ 63.773](/cfr/40/63.773.md); and - (iii) The recordkeeping and reporting requirements specified in §§ [63.774](/cfr/40/63.774.md) and [63.775](/cfr/40/63.775.md). - (3) For ancillary equipment (as defined in [§ 63.761](/cfr/40/63.761.md)) and compressors at a natural gas processing plant subject to this subpart, the owner or operator shall comply with the requirements for equipment leaks specified in [§ 63.769](/cfr/40/63.769.md). - (d) Except as specified in [paragraph (e)(1)](#e-1) of this section, the owner or operator of an affected source located at an existing or new area source of HAP emissions shall comply with the applicable standards specified in [paragraph (d)](#d) of this section. - (1) Each owner or operator of an area source located within an UA plus offset and UC boundary (as defined in [§ 63.761](/cfr/40/63.761.md)) shall comply with the provisions specified in [paragraphs (d)(1)(i) through (iii)](#d-1-i..d-1-iii) of this section. - (i) The control requirements for glycol dehydration unit process vents specified in [§ 63.765](/cfr/40/63.765.md); - (ii) The monitoring requirements specified in [§ 63.773](/cfr/40/63.773.md); and - (iii) The recordkeeping and reporting requirements specified in §§ [63.774](/cfr/40/63.774.md) and [63.775](/cfr/40/63.775.md). - (2) Each owner or operator of an area source not located in a UA plus offset and UC boundary (as defined in [§ 63.761](/cfr/40/63.761.md)) shall comply with [paragraphs (d)(2)(i) through (iii)](#d-2-i..d-2-iii) of this section. - (i) **Determine the optimum glycol circulation rate using the following equation—** - (ii) Operate the TEG dehydration unit such that the actual glycol circulation rate does not exceed the optimum glycol circulation rate determined in accordance with [paragraph (d)(2)(i)](#d-2-i) of this section. If the TEG dehydration unit is unable to meet the sales gas specification for moisture content using the glycol circulation rate determined in accordance with [paragraph (d)(2)(i)](#d-2-i), the owner or operator must calculate an alternate circulation rate using GRI-GLYCalc TM, Version 3.0 or higher. The owner or operator must document why the TEG dehydration unit must be operated using the alternate circulation rate and submit this documentation with the initial notification in accordance with [§ 63.775(c)(7)](/cfr/40/63.775.md?p=c-7). - (iii) Maintain a record of the determination specified in [paragraph (d)(2)(ii)](#d-2-ii) in accordance with the requirements in [§ 63.774(f)](/cfr/40/63.774.md?p=f) and submit the Initial Notification in accordance with the requirements in [§ 63.775(c)(7)](/cfr/40/63.775.md?p=c-7). If operating conditions change and a modification to the optimum glycol circulation rate is required, the owner or operator shall prepare a new determination in accordance with paragraph [(d)(2)(i)](#d-2-i) or [(ii)](#d-2-ii) of this section and submit the information specified under [§ 63.775(c)(7)(ii) through (v)](/cfr/40/63.775.md?p=c-7-ii..c-7-v). - (e) **Exemptions.** - (1) The owner or operator of an area source is exempt from the requirements of [paragraph (d)](#d) of this section if the criteria listed in paragraph [(e)(1)(i)](#e-1-i) or [(ii)](#e-1-ii) of this section are met, except that the records of the determination of these criteria must be maintained as required in [§ 63.774(d)(1)](/cfr/40/63.774.md?p=d-1). - (i) The actual annual average flowrate of natural gas to the glycol dehydration unit is less than 85 thousand standard cubic meters per day, as determined by the procedures specified in [§ 63.772(b)(1)](/cfr/40/63.772.md?p=b-1) of this subpart; or - (ii) The actual average emissions of benzene from the glycol dehydration unit process vent to the atmosphere are less than 0.90 megagram per year, as determined by the procedures specified in [§ 63.772(b)(2)](/cfr/40/63.772.md?p=b-2) of this subpart. - (2) The owner or operator is exempt from the requirements of [paragraph (c)(3)](#c-3) of this section for ancillary equipment (as defined in [§ 63.761](/cfr/40/63.761.md)) and compressors at a natural gas processing plant subject to this subpart if the criteria listed in paragraph [(e)(2)(i)](#e-2-i) or [(ii)](#e-2-ii) of this section are met, except that the records of the determination of these criteria must be maintained as required in [§ 63.774(d)(2)](/cfr/40/63.774.md?p=d-2). - (i) Any ancillary equipment and compressors that contain or contact a fluid (liquid or gas) must have a total VHAP concentration less than 10 percent by weight, as determined by the procedures specified in [§ 63.772(a)](/cfr/40/63.772.md?p=a); or - (ii) That ancillary equipment and compressors must operate in VHAP service less than 300 hours per calendar year. - (f) Each owner or operator of a major HAP source subject to this subpart is required to apply for a [40 CFR part 70](/cfr/40/part70.md) or [part 71](/cfr/40/part71.md) operating permit from the appropriate permitting authority. If the Administrator has approved a State operating permit program under [40 CFR part 70](/cfr/40/part70.md), the permit shall be obtained from the State authority. If a State operating permit program has not been approved, the owner or operator of a source shall apply to the EPA Regional Office pursuant to [40 CFR part 71](/cfr/40/part71.md). - (g) -(h) [Reserved] - (i) In all cases where the provisions of this subpart require an owner or operator to repair leaks by a specified time after the leak is detected, it is a violation of this standard to fail to take action to repair the leak(s) within the specified time. If action is taken to repair the leak(s) within the specified time, failure of that action to successfully repair the leak(s) is not a violation of this standard. However, if the repairs are unsuccessful, and a leak is detected, the owner or operator shall take further action as required by the applicable provisions of this subpart. - (j) At all times the owner or operator must operate and maintain any affected source, including associated air pollution control equipment and monitoring equipment, in a manner consistent with safety and good air pollution control practices for minimizing emissions. Determination of whether such operation and maintenance procedures are being used will be based on information available to the Administrator which may include, but is not limited to, monitoring results, review of operation and maintenance procedures, review of operation and maintenance records, and inspection of the source. # §63.765. Glycol dehydration unit process vent standards. - (a) This section applies to each glycol dehydration unit subject to this subpart that must be controlled for air emissions as specified in either paragraph (c)(1)(i) or [paragraph (d)(1)(i)](/cfr/40/63.764.md?p=d-1-i) of § 63.764. - (b) Except as provided in [paragraph (c)](#c) of this section, an owner or operator of a glycol dehydration unit process vent shall comply with the requirements specified in paragraphs [(b)(1)](#b-1) and [(b)(2)](#b-2) of this section. - (1) For each glycol dehydration unit process vent, the owner or operator shall control air emissions by either paragraph [(b)(1)(i)](#b-1-i), [(ii)](#b-1-ii), or [(iii)](#b-1-iii) of this section. - (i) The owner or operator of a large glycol dehydration unit, as defined in [§ 63.761](/cfr/40/63.761.md), shall connect the process vent to a control device or a combination of control devices through a closed-vent system. The closed-vent system shall be designed and operated in accordance with the requirements of [§ 63.771(c)](/cfr/40/63.771.md?p=c). The control device(s) shall be designed and operated in accordance with the requirements of [§ 63.771(d)](/cfr/40/63.771.md?p=d). - (ii) The owner or operator of a large glycol dehydration unit shall connect the process vent to a control device or combination of control devices through a closed-vent system and the outlet benzene emissions from the control device(s) shall be reduced to a level less than 0.90 megagrams per year. The closed-vent system shall be designed and operated in accordance with the requirements of [§ 63.771(c)](/cfr/40/63.771.md?p=c). The control device(s) shall be designed and operated in accordance with the requirements of [§ 63.771(d)](/cfr/40/63.771.md?p=d), except that the performance levels specified in § [63.771(d)(1)(i)](/cfr/40/63.771.md?p=d-1-i) and [(ii)](/cfr/40/63.771.md?p=d-1-ii) do not apply. - (iii) You must limit BTEX emissions from each existing small glycol dehydration unit process vent, as defined in [§ 63.761](/cfr/40/63.761.md), to the limit determined in Equation 1 of this section. You must limit BTEX emissions from each new small glycol dehydration unit process vent, as defined in [§ 63.761](/cfr/40/63.761.md), to the limit determined in Equation 2 of this section. The limits determined using Equation 1 or Equation 2 must be met in accordance with one of the alternatives specified in [paragraphs (b)(1)(iii)(A) through (D)](#b-1-iii-A..b-1-iii-D) of this section. Equation 1 - (A) Connect the process vent to a control device or combination of control devices through a closed-vent system. The closed vent system shall be designed and operated in accordance with the requirements of [§ 63.771(c)](/cfr/40/63.771.md?p=c). The control device(s) shall be designed and operated in accordance with the requirements of [§ 63.771(f)](/cfr/40/63.771.md?p=f). - (B) Meet the emissions limit through process modifications in accordance with the requirements specified in [§ 63.771(e)](/cfr/40/63.771.md?p=e). - (C) Meet the emissions limit for each small glycol dehydration unit using a combination of process modifications and one or more control devices through the requirements specified in paragraphs [(b)(1)(iii)(A)](#b-1-iii-A) and [(B)](#b-1-iii-B) of this section. - (D) Demonstrate that the emissions limit is met through actual uncontrolled operation of the small glycol dehydration unit. Document operational parameters in accordance with the requirements specified in [§ 63.771(e)](/cfr/40/63.771.md?p=e) and emissions in accordance with the requirements specified in [§ 63.772(b)(2)](/cfr/40/63.772.md?p=b-2). - (2) One or more safety devices that vent directly to the atmosphere may be used on the air emission control equipment installed to comply with [paragraph (b)(1)](#b-1) of this section. - (c) As an alternative to the requirements of [paragraph (b)](#b) of this section, the owner or operator may comply with one of the requirements specified in [paragraphs (c)(1) through (3)](#c-1..c-3) of this section. - (1) The owner or operator shall control air emissions by connecting the process vent to a process natural gas line. - (2) The owner or operator shall demonstrate, to the Administrator's satisfaction, that the total HAP emissions to the atmosphere from the large glycol dehydration unit process vent are reduced by 95.0 percent through process modifications, or a combination of process modifications and one or more control devices, in accordance with the requirements specified in [§ 63.771(e)](/cfr/40/63.771.md?p=e). - (3) Control of HAP emissions from a GCG separator (flash tank) vent is not required if the owner or operator demonstrates, to the Administrator's satisfaction, that total emissions to the atmosphere from the glycol dehydration unit process vent are reduced by one of the levels specified in [paragraph (c)(3)(i) through (iv)](#c-3-i..c-3-iv) of this section, through the installation and operation of controls as specified in [paragraph (b)(1)](#b-1) of this section. - (i) For any large glycol dehydration unit, HAP emissions are reduced by 95.0 percent or more. - (ii) For any large glycol dehydration unit, benzene emissions are reduced to a level less than 0.90 megagrams per year. - (iii) For each existing small glycol dehydration unit, BTEX emissions are reduced to a level less than the limit calculated by Equation 1 of [paragraph (b)(1)(iii)](#b-1-iii) of this section. - (iv) For each new small glycol dehydration unit, BTEX emissions are reduced to a level less than the limit calculated by Equation 2 of [paragraph (b)(1)(iii)](#b-1-iii) of this section. # §63.766. Storage vessel standards. - (a) This section applies to each storage vessel with the potential for flash emissions (as defined in [§ 63.761](/cfr/40/63.761.md)) subject to this subpart. - (b) The owner or operator of a storage vessel with the potential for flash emissions (as defined in [§ 63.761](/cfr/40/63.761.md)) shall comply with one of the control requirements specified in paragraphs [(b)(1)](#b-1) and [(2)](#b-2) of this section. - (1) The owner or operator shall equip the affected storage vessel with the potential for flash emissions with a cover that is connected, through a closed-vent system that meets the conditions specified in [§ 63.771(c)](/cfr/40/63.771.md?p=c), to a control device or a combination of control devices that meets any of the conditions specified in [§ 63.771(d)](/cfr/40/63.771.md?p=d). The cover shall be designed and operated in accordance with the requirements of [§ 63.771(b)](/cfr/40/63.771.md?p=b). - (2) The owner or operator of a pressure storage vessel that is designed to operate as a closed system shall operate the storage vessel with no detectable emissions at all times that material is in the storage vessel, except as provided for in [paragraph (c)](#c) of this section. - (3) The owner or operator shall control air emissions by connecting the cover, through a closed-vent system that meets the conditions specified in [§ 63.771(c)](/cfr/40/63.771.md?p=c), to a process natural gas line. - (c) One or more safety devices that vent directly to the atmosphere may be used on the storage vessel and air emission control equipment complying with paragraphs [(b)(1)](#b-1) and [(2)](#b-2) of this section. - (d) This section does not apply to storage vessels for which the owner or operator is subject to and controlled under the requirements specified in [40 CFR part 60](/cfr/40/part60.md), subparts [Kb](/cfr/40/subpartKb.md) or [OOOO](/cfr/40/subpartOOOO.md); or is subject to and controlled under the requirements specified under [40 CFR part 63](/cfr/40/part63.md) [subparts G](/cfr/40/subpartG.md) or CC. Storage vessels subject to and controlled under [40 CFR part 60](/cfr/40/part60.md), [subpart OOOO](/cfr/40/subpartOOOO.md) shall submit the periodic reports specified in [§ 63.775(e)](/cfr/40/63.775.md?p=e). # §63.767-63.768. Reserved # §63.769. Equipment leak standards. - (a) This section applies to equipment subject to this subpart and specified in paragraphs [(a)(1)](#a-1) and [(2)](#a-2) of this section that is located at a natural gas processing plant and operates in VHAP service equal to or greater than 300 hours per calendar year. - (1) Ancillary equipment, as defined in [§ 63.761](/cfr/40/63.761.md); and - (2) **Compressors.** - (b) This section does not apply to ancillary equipment and compressors for which the owner or operator is subject to and controlled under the requirements specified in [subpart H](/cfr/40/subpartH.md) of this part; or is subject to and controlled under the requirements specified in [40 CFR part 60](/cfr/40/part60.md), subpart OOOO. Ancillary equipment and compressors subject to and controlled under [40 CFR part 60](/cfr/40/part60.md), [subpart OOOO](/cfr/40/subpartOOOO.md) shall submit the periodic reports specified in [§ 63.775(e)](/cfr/40/63.775.md?p=e). - (c) For each piece of ancillary equipment and each compressor subject to this section located at an existing or new source, the owner or operator shall meet the requirements specified in [40 CFR part 61](/cfr/40/part61.md), [subpart V](/cfr/40/subpartV.md), [§§ 61.241 through 61.247](/cfr/40/61.241..61.247.md), except as specified in [paragraphs (c)(1) through (8)](#c-1..c-8) of this section, except that for valves subject to [§ 61.242-7(b)](/cfr/40/61.242-7.md?p=b) or [§ 61.243-1](/cfr/40/61.243-1.md), a leak is detected if an instrument reading of 500 ppm or greater is measured. A leak detected from a valve at a source constructed on or before August 23, 2011 shall be repaired in accordance with the schedule in [§ 61.242-7(d)](/cfr/40/61.242-7.md?p=d), or by October 15, 2013, whichever is later. A leak detected from a valve at a source constructed after August 23, 2011 shall be repaired in accordance with the schedule in [§ 61.242-7(d)](/cfr/40/61.242-7.md?p=d), or by October 15, 2012, whichever is later. - (1) Each pressure relief device in gas/vapor service shall be monitored quarterly and within 5 days after each pressure release to detect leaks, except under the following conditions. - (i) The owner or operator has obtained permission from the Administrator to use an alternative means of emission limitation that achieves a reduction in emissions of VHAP at least equivalent to that achieved by the control required in this subpart. - (ii) The pressure relief device is located in a nonfractionating facility that is monitored only by non-facility personnel, it may be monitored after a pressure release the next time the monitoring personnel are on site, instead of within 5 days. Such a pressure relief device shall not be allowed to operate for more than 30 days after a pressure release without monitoring. - (2) For pressure relief devices, if an instrument reading of 10,000 parts per million or greater is measured, a leak is detected. - (3) For pressure relief devices, when a leak is detected, it shall be repaired as soon as practicable, but no later than 15 calendar days after it is detected, unless a delay in repair of equipment is granted under [40 CFR 61.242-10](/cfr/40/61.242-10.md). - (4) Sampling connection systems are exempt from the requirements of [40 CFR 61.242-5](/cfr/40/61.242-5.md). - (5) Pumps in VHAP service, valves in gas/vapor and light liquid service, and pressure relief devices in gas/vapor service that are located at a nonfractionating plant that does not have the design capacity to process 283,000 standard cubic meters per day or more of field gas are exempt from the routine monitoring requirements of 40 CFR [61.242-2(a)(1)](/cfr/40/61.242-2.md?p=a-1) and [61.242-7(a)](/cfr/40/61.242-7.md?p=a), and [paragraphs (c)(1) through (3)](#c-1..c-3) of this section. - (6) Pumps in VHAP service, valves in gas/vapor and light liquid service, and pressure relief devices in gas/vapor service located within a natural gas processing plant that is located on the Alaskan North Slope are exempt from the routine monitoring requirements of 40 CFR [61.242-2(a)(1)](/cfr/40/61.242-2.md?p=a-1) and [61.242-7(a)](/cfr/40/61.242-7.md?p=a), and [paragraphs (c)(1) through (3)](#c-1..c-3) of this section. - (7) Reciprocating compressors in wet gas service are exempt from the compressor control requirements of [40 CFR 61.242-3](/cfr/40/61.242-3.md). - (8) Flares, as defined in [§ 63.761](/cfr/40/63.761.md), used to comply with this subpart shall comply with the requirements of [§ 63.11(b)](/cfr/40/63.11.md?p=b). # §63.770. Reserved # §63.771. Control equipment requirements. - (a) This section applies to each cover, closed-vent system, and control device installed and operated by the owner or operator to control air emissions as required by the provisions of this subpart. Compliance with paragraphs [(b)](#b), [(c)](#c), and [(d)](#d) of this section will be determined by review of the records required by [§ 63.774](/cfr/40/63.774.md) and the reports required by [§ 63.775](/cfr/40/63.775.md), by review of performance test results, and by inspections. - (b) **Cover requirements.** - (1) The cover and all openings on the cover (e.g., access hatches, sampling ports, and gauge wells) shall be designed to form a continuous barrier over the entire surface area of the liquid in the storage vessel. - (2) Each cover opening shall be secured in a closed, sealed position (e.g., covered by a gasketed lid or cap) whenever material is in the unit on which the cover is installed except during those times when it is necessary to use an opening as follows: - (i) To add material to, or remove material from the unit (this includes openings necessary to equalize or balance the internal pressure of the unit following changes in the level of the material in the unit); - (ii) To inspect or sample the material in the unit; - (iii) To inspect, maintain, repair, or replace equipment located inside the unit; or - (iv) To vent liquids, gases, or fumes from the unit through a closed-vent system to a control device designed and operated in accordance with the requirements of paragraphs [(c)](#c) and [(d)](#d) of this section. - (c) **Closed-vent system requirements.** - (1) The closed-vent system shall route all gases, vapors, and fumes emitted from the material in an emissions unit to a control device that meets the requirements specified in [paragraph (d)](#d) of this section. - (2) The closed-vent system shall be designed and operated with no detectable emissions. - (3) If the closed-vent system contains one or more bypass devices that could be used to divert all or a portion of the gases, vapors, or fumes from entering the control device, the owner or operator shall meet the requirements specified in paragraphs [(c)(3)(i)](#c-3-i) and [(c)(3)(ii)](#c-3-ii) of this section. - (i) For each bypass device, except as provided for in [paragraph (c)(3)(ii)](#c-3-ii) of this section, the owner or operator shall either: - (A) At the inlet to the bypass device that could divert the stream away from the control device to the atmosphere, properly install, calibrate, maintain, and operate a flow indicator that is capable of taking periodic readings and sounding an alarm when the bypass device is open such that the stream is being, or could be, diverted away from the control device to the atmosphere; or - (B) Secure the bypass device valve installed at the inlet to the bypass device in the non-diverting position using a car-seal or a lock-and-key type configuration. - (ii) Low leg drains, high point bleeds, analyzer vents, open-ended valves or lines, and safety devices are not subject to the requirements of [paragraph (c)(3)(i)](#c-3-i) of this section. - (d) **Control device requirements for sources except small glycol dehydration units.** Owners and operators of small glycol dehydration units, shall comply with the control device requirements in [paragraph (f)](#f) of this section. - (1) The control device used to reduce HAP emissions in accordance with the standards of this subpart shall be one of the control devices specified in [paragraphs (d)(1)(i) through (iii)](#d-1-i..d-1-iii) of this section. - (i) An enclosed combustion device (e.g., thermal vapor incinerator, catalytic vapor incinerator, boiler, or process heater) that is designed and operated in accordance with one of the following performance requirements: - (A) Reduces the mass content of either TOC or total HAP in the gases vented to the device by 95.0 percent by weight or greater as determined in accordance with the requirements of [§ 63.772(e)](/cfr/40/63.772.md?p=e); or - (B) Reduces the concentration of either TOC or total HAP in the exhaust gases at the outlet to the device to a level equal to or less than 20 parts per million by volume on a dry basis corrected to 3 percent oxygen as determined in accordance with the requirements of [§ 63.772(e)](/cfr/40/63.772.md?p=e); or - (C) Operates at a minimum temperature of 760 degrees C, provided the control device has demonstrated, under [§ 63.772(e)](/cfr/40/63.772.md?p=e), that combustion zone temperature is an indicator of destruction efficiency. - (D) If a boiler or process heater is used as the control device, then the vent stream shall be introduced into the flame zone of the boiler or process heater. - (ii) A vapor recovery device (e.g., carbon adsorption system or condenser) or other non-destructive control device that is designed and operated to reduce the mass content of either TOC or total HAP in the gases vented to the device by 95.0 percent by weight or greater as determined in accordance with the requirements of [§ 63.772(e)](/cfr/40/63.772.md?p=e). - (iii) A flare, as defined in [§ 63.761](/cfr/40/63.761.md), that is designed and operated in accordance with the requirements of [§ 63.11(b)](/cfr/40/63.11.md?p=b). - (2) [Reserved] - (3) The owner or operator shall demonstrate that a control device achieves the performance requirements of [paragraph (d)(1)](#d-1) of this section as specified in [§ 63.772(e)](/cfr/40/63.772.md?p=e). - (4) The owner or operator shall operate each control device in accordance with the requirements specified in paragraphs [(d)(4)(i)](#d-4-i) and [(ii)](#d-4-ii) of this section. - (i) Each control device used to comply with this subpart shall be operating at all times when gases, vapors, and fumes are vented from the HAP emissions unit or units through the closed-vent system to the control device, as required under [§ 63.765](/cfr/40/63.765.md), [§ 63.766](/cfr/40/63.766.md), and [§ 63.769](/cfr/40/63.769.md). An owner or operator may vent more than one unit to a control device used to comply with this subpart. - (ii) For each control device monitored in accordance with the requirements of [§ 63.773(d)](/cfr/40/63.773.md?p=d), the owner or operator shall demonstrate compliance according to the requirements of § [63.772(f)](/cfr/40/63.772.md?p=f) or [(g)](/cfr/40/63.772.md?p=g), as applicable. - (5) For each carbon adsorption system used as a control device to meet the requirements of [paragraph (d)(1)](#d-1) of this section, the owner or operator shall manage the carbon as follows: - (i) Following the initial startup of the control device, all carbon in the control device shall be replaced with fresh carbon on a regular, predetermined time interval that is no longer than the carbon service life established for the carbon adsorption system. Records identifying the schedule for replacement and records of each carbon replacement shall be maintained as required in [§ 63.774(b)(7)(ix)](/cfr/40/63.774.md?p=b-7-ix). The schedule for replacement shall be submitted with the Notification of Compliance Status Report as specified in [§ 63.775(d)(5)(iv)](/cfr/40/63.775.md?p=d-5-iv). Each carbon replacement must be reported in the Periodic Reports as specified in [§ 63.772(e)(2)(xii)](/cfr/40/63.772.md?p=e-2-xii). - (ii) The spent carbon removed from the carbon adsorption system shall be either regenerated, reactivated, or burned in one of the units specified in [paragraphs (d)(5)(ii)(A) through (d)(5)(ii)(G)](#d-5-ii-A..d-5-ii-G) of this section. - (A) Regenerated or reactivated in a thermal treatment unit for which the owner or operator has been issued a final permit under [40 CFR part 270](/cfr/40/part270.md) that implements the requirements of [40 CFR part 264](/cfr/40/part264.md), subpart X. - (B) Regenerated or reactivated in a thermal treatment unit equipped with and operating air emission controls in accordance with this section. - (C) Regenerated or reactivated in a thermal treatment unit equipped with and operating organic air emission controls in accordance with a national emissions standard for HAP under another subpart in [40 CFR part 61](/cfr/40/part61.md) or this part. - (D) Burned in a hazardous waste incinerator for which the owner or operator has been issued a final permit under [40 CFR part 270](/cfr/40/part270.md) that implements the requirements of [40 CFR part 264](/cfr/40/part264.md), subpart O. - (E) Burned in a hazardous waste incinerator which the owner or operator has designed and operates in accordance with the requirements of [40 CFR part 265](/cfr/40/part265.md), subpart O. - (F) Burned in a boiler or industrial furnace for which the owner or operator has been issued a final permit under [40 CFR part 270](/cfr/40/part270.md) that implements the requirements of [40 CFR part 266](/cfr/40/part266.md), subpart H. - (G) Burned in a boiler or industrial furnace which the owner or operator has designed and operates in accordance with the interim status requirements of [40 CFR part 266](/cfr/40/part266.md), subpart H. - (e) **Process modification requirements.** Each owner or operator that chooses to comply with [§ 63.765(c)(2)](/cfr/40/63.765.md?p=c-2) shall meet the requirements specified in [paragraphs (e)(1) through (e)(3)](#e-1..e-3) of this section. - (1) The owner or operator shall determine glycol dehydration unit baseline operations (as defined in [§ 63.761](/cfr/40/63.761.md)). Records of glycol dehydration unit baseline operations shall be retained as required under [§ 63.774(b)(10)](/cfr/40/63.774.md?p=b-10). - (2) The owner or operator shall document, to the Administrator's satisfaction, the conditions for which glycol dehydration unit baseline operations shall be modified to achieve the 95.0 percent overall HAP emission reduction, or BTEX limit determined in [§ 63.765(b)(1)(iii)](/cfr/40/63.765.md?p=b-1-iii), as applicable, either through process modifications or through a combination of process modifications and one or more control devices. If a combination of process modifications and one or more control devices are used, the owner or operator shall also establish the emission reduction to be achieved by the control device to achieve an overall HAP emission reduction of 95.0 percent for the glycol dehydration unit process vent or, if applicable, the BTEX limit determined in [§ 63.765(b)(1)(iii)](/cfr/40/63.765.md?p=b-1-iii) for the small glycol dehydration unit process vent. Only modifications in glycol dehydration unit operations directly related to process changes, including but not limited to changes in glycol circulation rate or glycol-HAP absorbency, shall be allowed. Changes in the inlet gas characteristics or natural gas throughput rate shall not be considered in determining the overall emission reduction due to process modifications. - (3) The owner or operator that achieves a 95.0 percent HAP emission reduction or meets the BTEX limit determined in [§ 63.765(b)(1)(iii)](/cfr/40/63.765.md?p=b-1-iii), as applicable, using process modifications alone shall comply with [paragraph (e)(3)(i)](#e-3-i) of this section. The owner or operator that achieves a 95.0 percent HAP emission reduction or meets the BTEX limit determined in [§ 63.765(b)(1)(iii)](/cfr/40/63.765.md?p=b-1-iii), as applicable, using a combination of process modifications and one or more control devices shall comply with paragraphs [(e)(3)(i)](#e-3-i) and [(ii)](#e-3-ii) of this section. - (i) The owner or operator shall maintain records, as required in [§ 63.774(b)(11)](/cfr/40/63.774.md?p=b-11), that the facility continues to operate in accordance with the conditions specified under [paragraph (e)(2)](#e-2) of this section. - (ii) The owner or operator shall comply with the control device requirements specified in paragraph [(d)](#d) or [(f)](#f) of this section, as applicable, except that the emission reduction or limit achieved shall be the emission reduction or limit specified for the control device(s) in [paragraph (e)(2)](#e-2) of this section. - (f) **Control device requirements for small glycol dehydration units.** - (1) The control device used to meet BTEX the emission limit calculated in [§ 63.765(b)(1)(iii)](/cfr/40/63.765.md?p=b-1-iii) shall be one of the control devices specified in [paragraphs (f)(1)(i) through (iii)](#f-1-i..f-1-iii) of this section. - (i) An enclosed combustion device (e.g., thermal vapor incinerator, catalytic vapor incinerator, boiler, or process heater) that is designed and operated to meet the levels specified in paragraphs [(f)(1)(i)(A)](#f-1-i-A) or [(B)](#f-1-i-B) of this section. If a boiler or process heater is used as the control device, then the vent stream shall be introduced into the flame zone of the boiler or process heater. - (A) The mass content of BTEX in the gases vented to the device is reduced as determined in accordance with the requirements of [§ 63.772(e)](/cfr/40/63.772.md?p=e). - (B) The concentration of either TOC or total HAP in the exhaust gases at the outlet of the device is reduced to a level equal to or less than 20 parts per million by volume on a dry basis corrected to 3 percent oxygen as determined in accordance with the requirements of [§ 63.772(e)](/cfr/40/63.772.md?p=e). - (ii) A vapor recovery device (e.g., carbon adsorption system or condenser) or other non-destructive control device that is designed and operated to reduce the mass content of BTEX in the gases vented to the device as determined in accordance with the requirements of [§ 63.772(e)](/cfr/40/63.772.md?p=e). - (iii) A flare, as defined in [§ 63.761](/cfr/40/63.761.md), that is designed and operated in accordance with the requirements of [§ 63.11(b)](/cfr/40/63.11.md?p=b). - (2) The owner or operator shall operate each control device in accordance with the requirements specified in paragraphs [(f)(2)(i)](#f-2-i) and [(ii)](#f-2-ii) of this section. - (i) Each control device used to comply with this subpart shall be operating at all times. An owner or operator may vent more than one unit to a control device used to comply with this subpart. - (ii) For each control device monitored in accordance with the requirements of [§ 63.773(d)](/cfr/40/63.773.md?p=d), the owner or operator shall demonstrate compliance according to the requirements of either § [63.772(f)](/cfr/40/63.772.md?p=f) or [(h)](/cfr/40/63.772.md?p=h). - (3) For each carbon adsorption system used as a control device to meet the requirements of [paragraph (f)(1)(ii)](#f-1-ii) of this section, the owner or operator shall manage the carbon as required under (d)(5)(i) and (ii) of this section.