(3) You must calibrate the detection instrument before use on each day of its use by the procedures specified in Method 21, 40 CFR part 60, appendix A-7.
      (4) Calibration gases must be as specified in paragraphs (e)(4)(i) and (ii) of this section.
      (i) Zero air (less than 10 parts per million by volume hydrocarbon in air).
      (ii) A mixture of methane in air at a concentration less than 10,000 parts per million by volume.
      (5) You may choose to adjust or not adjust the detection instrument readings to account for the background organic concentration level. If you choose to adjust the instrument readings for the background level, you must determine the background level value according to the procedures in Method 21, 40 CFR part 60, appendix A-7.
      (6) Your detection instrument must meet the performance criteria specified in paragraphs (e)(6)(i) and (ii) of this section.
      (i) Except as provided in paragraph (e)(6)(ii) of this section, the detection instrument must meet the performance criteria of Method 21, 40 CFR part 60, appendix A-7, except the instrument response factor criteria in section 3.1.2(a) of Method 21 must be for the average composition of the process fluid, not each individual volatile organic compound in the stream. For process streams that contain nitrogen, air, or other inerts that are not volatile organic compounds, you must calculate the average stream response factor on an inert-free basis.
      (ii) If no instrument is available that will meet the performance criteria specified in paragraph (e)(6)(i) of this section, you may adjust the instrument readings by multiplying by the average response factor of the process fluid, calculated on an inert-free basis, as described in paragraph (e)(6)(i) of this section.
      (7) You must determine if a potential leak interface operates with no detectable emissions using the applicable procedure specified in paragraph (e)(7)(i) or (ii) of this section.
      (i) If you choose not to adjust the detection instrument readings for the background organic concentration level, then you must directly compare the maximum organic concentration value measured by the detection instrument to the applicable value for the potential leak interface as specified in paragraph (e)(8) of this section.
      (ii) If you choose to adjust the detection instrument readings for the background organic concentration level, you must compare the value of the arithmetic difference between the maximum organic concentration value measured by the instrument and the background organic concentration value as determined in paragraph (e)(5) of this section with the applicable value for the potential leak interface as specified in paragraph (e)(8) of this section.
      (8) A potential leak interface is determined to operate with no detectable organic emissions if the organic concentration value determined in paragraph (e)(7) of this section is less than 500 parts per million by volume.
      (9) Repairs. In the event that a leak or defect is detected, you must repair the leak or defect as soon as practicable according to the requirements of paragraphs (e)(9)(i) and (ii) of this section, except as provided in paragraph (e)(10) of this section.
      (i) A first attempt at repair must be made no later than 5 calendar days after the leak is detected.
      (ii) Repair must be completed no later than 15 calendar days after the leak is detected.
      (10) Delay of repair. Delay of repair of a closed vent system or cover for which leaks or defects have been detected is allowed if the repair is technically infeasible without a shutdown, or if you determine that emissions resulting from immediate repair would be greater than the fugitive emissions likely to result from delay of repair. You must complete repair of such equipment by the end of the next shutdown.
      (11) Unsafe to inspect requirements. You may designate any parts of the closed vent system or cover as unsafe to inspect if the requirements in paragraphs (e)(11)(i) and (ii) of this section are met. Unsafe to inspect parts are exempt from the inspection requirements of paragraphs (a) through (c) of this section.
      (i) You determine that the equipment is unsafe to inspect because inspecting personnel would be exposed to an imminent or potential danger as a consequence of complying with paragraphs (a), (b), or (c) of this section.
      (ii) You have a written plan that requires inspection of the equipment as frequently as practicable during safe-to-inspect times.
      (12) Difficult to inspect requirements. You may designate any parts of the closed vent system or cover as difficult to inspect, if the requirements in paragraphs (e)(12)(i) and (ii) of this section are met. Difficult to inspect parts are exempt from the inspection requirements of paragraphs (a) through (c) of this section.
      (i) You determine that the equipment cannot be inspected without elevating the inspecting personnel more than 2 meters above a support surface.
      (ii) You have a written plan that requires inspection of the equipment at least once every 5 years.
      (13) Records. Records shall be maintained as specified in this section and in sections that reference this section.

E	VOC Emission Control Device Requirements
E.1	Initial Control Device Compliance Requirements
      You must meet the applicable requirements of this section for each control device used to comply with VOC emission reduction requirements by the compliance date specified by your regulatory authority.
      (a) Each control device used to meet the VOC emission reduction requirements must be installed according to paragraphs (a)(1) through (3) of this section. As an alternative, you may install a control device model tested under section F(d), which meets the criteria in section F(d)(11) and section F(e).
      (1) Each combustion device (e.g., thermal vapor incinerator, catalytic vapor incinerator, boiler, or process heater) must be designed and operated in accordance with one of the performance requirements specified in paragraphs (a)(1)(i) through (iv) of this section.
      (i) You must reduce the mass content of VOC in the gases vented to the device by 95 percent by weight or greater as determined in accordance with the requirements of section F(b).
      (ii) You must reduce the concentration of TOC in the exhaust gases at the outlet to the device to a level equal to or less than 600 parts per million by volume as propane on a dry basis corrected to 3 percent oxygen as determined in accordance with the requirements of section F(b).
      (iii) You must operate at a minimum temperature of 760°C for a control device that can demonstrate a uniform combustion zone temperature during the performance test conducted under section F(b).
      (iv) If a boiler or process heater is used as the control device, then you must introduce the vent stream into the flame zone of the boiler or process heater.
      (2) Each vapor recovery device (e.g., carbon adsorption system or condenser) or other non-destructive control device must be designed and operated to reduce the mass content of VOC in the gases vented to the device by 95 percent by weight or greater as determined in accordance with the requirements of section F. As an alternative to the performance testing requirements, you may demonstrate initial compliance by conducting a design analysis for vapor recovery devices according to the requirements of section F(c).
      (3) You must design and operate a flare in accordance with the requirements of section F.
      (b) You must operate each control device installed to control VOC emissions from your emissions source in accordance with the requirements specified in paragraphs (b)(1) and (2) of this section.
      (1) You must operate each control device used to comply with this rule at all times when gases, vapors, and fumes are vented from your VOC emissions source through the closed vent system to the control device. You may vent more than one source to a control device used to comply with this rule.
      (2) For each control device monitored in accordance with the requirements of section E.2(a) through (g), you must demonstrate continuous compliance according to the requirements of section A.4(c) for storage vessels, section C.5(a)(2) for centrifugal compressors, section H.4 for pneumatic pumps, and as applicable.
      (c) For each carbon adsorption system used as a control device to meet the requirements of paragraph (a)(2) of this section, you must manage the carbon in accordance with the requirements specified in paragraphs (c)(1) or (2) of this section.
      (1) Following the compliance date established by your regulatory authority for the source using the control device, you must replace all carbon in the control device with fresh carbon on a regular, predetermined time interval that is no longer than the carbon service life established according to section F(c)(2) or (3) or according to the design required in paragraph (a)(2) of this section, for the carbon adsorption system. You must maintain records identifying the schedule for replacement and records of each carbon replacement.
      (2) You must either regenerate, reactivate, or burn the spent carbon removed from the carbon adsorption system in one of the units specified in paragraphs (c)(2)(i) through (vii) of this section.
      (i) Regenerate or reactivate the spent carbon in a thermal treatment unit for which you have been issued a final permit under 40 CFR part 270 that implements the requirements of 40 CFR part 264, subpart X.
      (ii) Regenerate or reactivate the spent carbon in a thermal treatment unit equipped with and operating air 95 percent in accordance with this section.
      (iii) Regenerate or reactivate the spent carbon in a thermal treatment unit equipped with and operating organic air 95 percent in accordance with an emissions standard for VOC under this rule.
      (iv) Burn the spent carbon in a hazardous waste incinerator for which the owner or operator has been issued a final permit under 40 CFR part 270 that implements the requirements of 40 CFR part 264, subpart O.
      (v) Burn the spent carbon in a hazardous waste incinerator which you have designed and operated in accordance with the requirements of 40 CFR part 265, subpart O.
      (vi) Burn the spent carbon in a boiler or industrial furnace for which you have been issued a final permit under 40 CFR part 270 that implements the requirements of 40 CFR part 266, subpart H.
      (vii) Burn the spent carbon in a boiler or industrial furnace that you have designed and operated in accordance with the interim status requirements of 40 CFR part 266, subpart H.
      (d) Each control device used to meet the emission reduction standard in section A.2 for a storage vessel must be installed according to paragraphs (d)(1) through (4) of this section, as applicable. As an alternative to paragraph (d)(1) of this section, you may install a control device model tested under section F(d), which meets the criteria in section F(d)(11) and F(e).
      (1) Each enclosed combustion device (e.g., thermal vapor incinerator, catalytic vapor incinerator, boiler, or process heater) must be designed to reduce the mass content of VOC emissions by 95.0 percent or greater. You must follow the requirements in paragraphs (d)(1)(i) through (iii) of this section.
      (i) Ensure that each enclosed combustion device is maintained in a leak free condition.
      (ii) Install and operate a continuous burning pilot flame.
      (iii) Operate the enclosed combustion device with no visible emissions, except for periods not to exceed a total of one minute during any 15 minute period. A visible emissions test using section 11 of EPA Method 22, 40 CFR part 60, appendix A, must be performed at least once every calendar month, separated by at least 15 days between each test. The observation period shall be 15 minutes. Devices failing the visible emissions test must follow manufacturer's repair instructions, if available, or best combustion engineering practice as outlined in the unit inspection and maintenance plan, to return the unit to compliant operation. All inspection, repair and maintenance activities for each unit must be recorded in a maintenance and repair log and must be available for inspection. Following return to operation from maintenance or repair activity, each device must pass a Method 22, 40 CFR part 60, appendix A, visual observation as described in this paragraph.
      (2) Each vapor recovery device (e.g., carbon adsorption system or condenser) or other non-destructive control device must be designed and operated to reduce the mass content of VOC in the gases vented to the device by 95.0 percent by weight or greater. A carbon replacement schedule must be included in the design of the carbon adsorption system.
      (3) You must operate each control device used to comply with this subpart at all times when gases, vapors, and fumes are vented from the storage vessel affected facility through the closed vent system to the control device. You may vent more than one affected facility to a control device used to comply with this subpart.
      (4) Each combustion control device (e.g., thermal vapor incinerator, catalytic vapor incinerator, boiler, or process heater) must be designed and operated in accordance with one of
the performance requirements specified in paragraphs (i) through (iv) of this section.
      (i) You must reduce the mass content of methane and VOC in the gases vented to the device by 95.0 percent by weight or greater as determined in accordance with the requirements of section F.
      (ii) You must reduce the concentration of TOC in the exhaust gases at the outlet to the device to a level equal to or less than 600 parts per million by volume as propane on a dry basis corrected to 3 percent oxygen as determined in accordance with the requirements of section F.
      (iii) You must operate at a minimum temperature of 760°C for a control device that can demonstrate a uniform combustion zone temperature during the performance test conducted under section F.
 	(iv) If a boiler or process heater is used as the control device, then you must introduce the vent stream into the flame zone of the boiler or process heater.
E.2	Continuous Control Device Monitoring Requirements
      You must meet the applicable requirements of this section to demonstrate continuous compliance for each control device used to meet VOC emission control requirements.
      (a) For each control device used to comply with the VOC emission reduction requirements, you must install and operate a continuous parameter monitoring system for each control device as specified in paragraphs (c) through (h) of this section, except as provided for in paragraph (b) of this section. If you install and operate a flare in accordance with section E.1(a)(3), you are exempt from the requirements of paragraphs (e) and (f) of this section.
      (b) You are exempt from the monitoring requirements specified in paragraphs (c) through (f) of this section for the control devices listed in paragraphs (b)(1) and (2) of this section.
      (1) A boiler or process heater in which all vent streams are introduced with the primary fuel, or used as the primary fuel.
      (2) A boiler or process heater with a design heat input capacity equal to or greater than 44 megawatts.
      (c) If you are required to install a continuous parameter monitoring system, you must meet the specifications and requirements in paragraphs (c)(1) through (4) of this section.
      (1) Each continuous parameter monitoring system must measure data values at least once every hour and record the parameters in paragraphs (c)(1)(i) or (ii) of this section.
      (i) Each measured data value.
      (ii) Each block average value for each 1-hour period or shorter periods calculated from all measured data values during each period. If values are measured more frequently than once per minute, a single value for each minute may be used to calculate the hourly (or shorter period) block average instead of all measured values.
      (2) You must prepare a site-specific monitoring plan that addresses the monitoring system design, data collection, and the quality assurance and quality control elements outlined in paragraphs (c)(2)(i) through (v) of this section. You must install, calibrate, operate, and maintain each continuous parameter monitoring system in accordance with the procedures in your approved site-specific monitoring plan.
      (i) The performance criteria and design specifications for the monitoring system equipment, including the sample interface, detector signal analyzer, and data acquisition and calculations.
      (ii) Sampling interface (e.g., thermocouple) location such that the monitoring system will provide representative measurements.
      (iii) Equipment performance checks, system accuracy audits, or other audit procedures.
      (iv) On-going operation and maintenance procedures in accordance with provisions in 40 CFR 60.13(b).
      (v) Ongoing reporting and recordkeeping procedures in accordance with provisions in 40 CFR 60.7(c), (d), and (f).
      (3) You must conduct the continuous parameter monitoring system equipment performance checks, system accuracy audits, or other audit procedures specified in the site-specific monitoring plan at least once every 12 months.
      (4) You must conduct a performance evaluation of each continuous parameter monitoring system in accordance with the site-specific monitoring plan.
      (d) You must install, calibrate, operate, and maintain a device equipped with a continuous recorder to measure the values of operating parameters appropriate for the control device as specified in either paragraph (d)(1), (2), or (3) of this section.
      (1) A continuous monitoring system that measures the operating parameters in paragraphs (d)(1)(i) through (viii) of this section, as applicable.
      (i) For a thermal vapor incinerator that demonstrates during the performance test conducted under section X.F that combustion zone temperature is an accurate indicator of performance, a temperature monitoring device equipped with a continuous recorder. The monitoring device must have a minimum accuracy of +-1 percent of the temperature being monitored in °C, or +-2.5°C, whichever value is greater. You must install the temperature sensor at a location representative of the combustion zone temperature.
      (ii) For a catalytic vapor incinerator, a temperature monitoring device equipped with a continuous recorder. The device must be capable of monitoring temperature at two locations and have a minimum accuracy of +-1 percent of the temperature being monitored in °C, or +-2.5°C, whichever value is greater. You must install one temperature sensor in the vent stream at the nearest feasible point to the catalyst bed inlet, and you must install a second temperature sensor in the vent stream at the nearest feasible point to the catalyst bed outlet.
      (iii) For a flare, a heat sensing monitoring device equipped with a continuous recorder that indicates the continuous ignition of the pilot flame.
      (iv) For a boiler or process heater, a temperature monitoring device equipped with a continuous recorder. The temperature monitoring device must have a minimum accuracy of +-1 percent of the temperature being monitored in °C, or +-2.5°C, whichever value is greater. You must install the temperature sensor at a location representative of the combustion zone temperature.
      (v) For a condenser, a temperature monitoring device equipped with a continuous recorder. The temperature monitoring device must have a minimum accuracy of +-1 percent of the temperature being monitored in °C, or +-2.8°C, whichever value is greater. You must install the temperature sensor at a location in the exhaust vent stream from the condenser.
      (vi) For a regenerative-type carbon adsorption system, a continuous monitoring system that meets the specifications in paragraphs (d)(1)(vi)(A) and (B) of this section.
      (A) The continuous parameter monitoring system must measure and record the average total regeneration stream mass flow or volumetric flow during each carbon bed regeneration cycle. The flow sensor must have a measurement sensitivity of 5 percent of the flow rate or 10 cubic feet per minute, whichever is greater. You must check the mechanical connections for leakage at least every month, and you must perform a visual inspection at least every 3 months of all components of the flow continuous parameter monitoring system for physical and operational integrity and all electrical connections for oxidation and galvanic corrosion if your flow continuous parameter monitoring system is not equipped with a redundant flow sensor; and
      (B) The continuous parameter monitoring system must measure and record the average carbon bed temperature for the duration of the carbon bed steaming cycle and measure the actual carbon bed temperature after regeneration and within 15 minutes of completing the cooling cycle. The temperature monitoring device must have a minimum accuracy of +-1 percent of the temperature being monitored in °C, or +-2.5°C, whichever value is greater.
      (vii) For a non-regenerative-type carbon adsorption system, you must monitor the design carbon replacement interval established using a performance test performed as specified in section X.F(b). The design carbon replacement interval must be based on the total carbon working capacity of the control device and source operating schedule.
      (viii) For a combustion control device whose model is tested under section X.F(d), a continuous monitoring system meeting the requirements of paragraphs (d)(1)(viii)(A) through (D) of this section.
      (A) The continuous monitoring system must measure gas flow rate at the inlet to the control device. The monitoring instrument must have an accuracy of +-2 percent or better. The flow rate at the inlet to the combustion device must not exceed the maximum or minimum flow rate determined by the manufacturer.
      (B) A monitoring device that continuously indicates the presence of the pilot flame while emissions are routed to the control device.
	(C) Devices failing the visible emissions test must follow manufacturer's repair instructions, if available, or best combustion engineering practice as outlined in the unit inspection and maintenance plan, to return the unit to compliant operation. All repairs and maintenance activities for each unit must be recorded in a maintenance and repair log and must be available for inspection.
      (D) Following return to operation from maintenance or repair activity, each device must pass a Method 22, 40 CFR part 60, appendix A, visual observation as described in paragraph (d)(2)(viii)(B) of this section.
      (2) An organic monitoring device equipped with a continuous recorder that measures the concentration level of organic compounds in the exhaust vent stream from the control device. The monitor must meet the requirements of Performance Specification 8 or 9 of 40 CFR part 60, appendix B. You must install, calibrate, and maintain the monitor according to the manufacturer's specifications.
      (3) A continuous monitoring system that measures operating parameters other than those specified in paragraph (d)(1) or (2) of this section, upon approval of the regulatory authority.
      (e) You must calculate the daily average value for each monitored operating parameter for each operating day, using the data recorded by the monitoring system, except for inlet gas flow rate. If the emissions unit operation is continuous, the operating day is a 24-hour period. If the emissions unit operation is not continuous, the operating day is the total number of hours of control device operation per 24-hour period. Valid data points must be available for 75 percent of the operating hours in an operating day to compute the daily average.
      (f) For each operating parameter monitor installed in accordance with the requirements of paragraph (d) of this section, you must comply with paragraph (f)(1) of this section for all control devices. When condensers are installed, you must also comply with paragraph (f)(2) of this section.
      (1) You must establish a minimum operating parameter value or a maximum operating parameter value, as appropriate for the control device, to define the conditions at which the control device must be operated to continuously achieve the applicable performance requirements of section E.1(a). You must establish each minimum or maximum operating parameter value as specified in paragraphs (f)(1)(i) through (iii) of this section.
      (i) If you conduct performance tests in accordance with the requirements of section F(b) to demonstrate that the control device achieves the applicable performance requirements specified in section E.1(a), then you must establish the minimum operating parameter value or the maximum operating parameter value based on values measured during the performance test and supplemented, as necessary, by a condenser design analysis or control device manufacturer recommendations or a combination of both.
      (ii) If you use a condenser design analysis in accordance with the requirements of section F(c) to demonstrate that the control device achieves the applicable performance requirements specified in section E.1(a), then you must establish the minimum operating parameter value or the maximum operating parameter value based on the condenser design analysis and supplemented, as necessary, by the condenser manufacturer's recommendations.
      (iii) If you operate a control device where the performance test requirement was met under section F(d) to demonstrate that the control device achieves the applicable performance requirements specified in section E.1(a), then your control device inlet gas flow rate must not exceed the maximum or minimum inlet gas flow rate determined by the manufacturer.
      (2) If you use a condenser as specified in paragraph (d)(1)(v) of this section, you must establish a condenser performance curve showing the relationship between condenser outlet temperature and condenser control efficiency, according to the requirements of paragraphs (f)(2)(i) and (ii) of this section.
      (i) If you conduct a performance test in accordance with the requirements of section F(b) to demonstrate that the condenser achieves the applicable performance requirements in section E.1(a), then the condenser performance curve must be based on values measured during the performance test and supplemented as necessary by control device design analysis, or control device manufacturer's recommendations, or a combination or both.
      (ii) If you use a control device design analysis in accordance with the requirements of section F(c)(1) to demonstrate that the condenser achieves the applicable performance requirements specified in section E.1(a), then the condenser performance curve must be based on the condenser design analysis and supplemented, as necessary, by the control device manufacturer's recommendations.
      (g) A deviation for a given control device is determined to have occurred when the monitoring data or lack of monitoring data result in any one of the criteria specified in paragraphs (g)(1) through (6) of this section being met. If you monitor multiple operating parameters for the same control device during the same operating day and more than one of these operating parameters meets a deviation criterion specified in paragraphs (g)(1) through (6) of this section, then a single excursion is determined to have occurred for the control device for that operating day.
      (1) A deviation occurs when the daily average value of a monitored operating parameter is less than the minimum operating parameter limit (or, if applicable, greater than the maximum operating parameter limit) established in paragraph (f)(1) of this section.
      (2) If you meet section E.1(a)(2), a deviation occurs when the 365-day average condenser efficiency calculated according to the requirements specified in section F(b) is less than 95 percent.
      (3) If you meet section E.1(a)(2) and you have less than 365 days of data, a deviation occurs when the average condenser efficiency calculated according to the procedures specified in section F(b) is less than 90.0 percent.
      (4) A deviation occurs when the monitoring data are not available for at least 75 percent of the operating hours in a day.
      (5) 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, a deviation occurs when the requirements of paragraphs (g)(5)(i) and (ii) of this section are met.
      (i) For each bypass line subject to section D.1(b)(3)(i)(A), the flow indicator indicates that flow has been detected and that the stream has been diverted away from the control device to the atmosphere.
      (ii) For each bypass line subject to section D.1(b)(3)(i)(B), if the seal or closure mechanism has been broken, the bypass line valve position has changed, the key for the lock-and-key type lock has been checked out, or the car-seal has broken.
      (6) For a combustion control device whose model is tested under section F(d), a deviation occurs when the conditions of paragraphs (g)(6)(i) or (ii) are met.
      (i) The inlet gas flow rate exceeds the maximum established during the test conducted under section F(d).
      (ii) Failure of the monthly visible emissions test conducted under section F(e)(3) occurs.
      (h) Each control device used to meet a VOC emission reduction requirement must be operated following the manufacturer's written operating instructions, procedures and maintenance schedule to ensure good air pollution control practices for minimizing emissions. Records of the manufacturer's written operating instructions, procedures, and maintenance schedule must be available for inspection.
F	Performance Test Procedures
      This section applies to the performance testing of control devices used to demonstrate compliance with your VOC emission control requirements. You must demonstrate that a control device achieves the performance requirements specified for your emissions source using the performance test methods and procedures specified in this section. For condensers, you may use a design analysis as specified in paragraph (c) of this section in lieu of complying with paragraph (b) of this section. In addition, this section contains the requirements for enclosed combustion device performance tests conducted by the manufacturer, as relevant and allowed for compliance demonstration purposes.
      (a) Performance test exemptions. You are exempt from the requirements to conduct performance tests and design analyses if you use any of the control devices described in paragraphs (a)(1) through (7) of this section.
      (1) A flare that is designed and operated in accordance with 40 CFR 60.18(b). You must conduct the compliance determination using Method 22, 40 CFR part 60, appendix A-7, to determine visible emissions.
      (2) A boiler or process heater with a design heat input capacity of 44 megawatts or greater.
      (3) A boiler or process heater into which the vent stream is introduced with the primary fuel or is used as the primary fuel.
      (4) A boiler or process heater burning hazardous waste for which you have either been issued a final permit under 40 CFR part 270 and comply with the requirements of 40 CFR part 266, subpart H; or you have certified compliance with the interim status requirements of 40 CFR part 266, subpart H.
      (5) A hazardous waste incinerator for which you have been issued a final permit under 40 CFR part 270 and comply with the requirements of 40 CFR part 264, subpart O; or you have certified compliance with the interim status requirements of 40 CFR part 265, subpart O.
      (6) A performance test is waived in accordance with 40 CFR 60.8(b).
      (7) A control device whose model can be demonstrated to meet the performance requirements of section E.1(a) through a performance test conducted by the manufacturer, as specified in paragraph (d) of this section.
      (b) Test methods and procedures. You must use the test methods and procedures specified in paragraphs (b)(1) through (5) of this section, as applicable, for each performance test conducted to demonstrate that a control device meets the requirements of section E.1(a). You must conduct the initial and periodic performance tests according to the schedule specified in paragraph (b)(5) of this section.
      (1) You must use Method 1 or 1A, 40 CFR part 60, appendix A-1, as appropriate, to select the sampling sites specified in paragraphs (b)(1)(i) and (ii) of this section. Any references to particulate mentioned in Methods 1 and 1A do not apply to this section.
      (i) Sampling sites must be located at the inlet of the first control device, and at the outlet of the final control device, to determine compliance with the control device percent reduction requirement specified in section E.1(a)(1)(i) or (a)(2).
      (ii) The sampling site must be located at the outlet of the combustion device to determine compliance with the enclosed combustion device TOC concentration limit specified in section E.1(a)(1)(ii).
      (2) You must determine the gas volumetric flowrate using Method 2, 2A, 2C, or 2D, 40 CFR part 60, appendix A-2, as appropriate.
      (3) To determine compliance with the control device percent reduction performance requirement in section E.1(a)(1)(i) or (a)(2), you must use Method 25A at 40 CFR part 60, appendix A-7. You must use the procedures in paragraphs (b)(3)(i) through (iv) of this section to calculate percent reduction efficiency.
      (i) For each run, you must take either an integrated sample or a minimum of four grab samples per hour. If grab sampling is used, then the samples must be taken at approximately equal intervals in time, such as 15-minute intervals during the run.
      (ii) You must compute the mass rate of TOC (minus methane and ethane) using the equations and procedures specified in paragraphs (b)(3)(ii)(A) and (B) of this section.
      (A) You must use the following equations:

Where:
      Ei, Eo = Mass rate of TOC (minus methane and ethane) at the inlet and outlet of the control device, respectively, dry basis, kilogram per hour.
      K2 = Constant, 2.494 x 10[−6] (parts per million) (gram-mole per standard cubic meter) (kilogram/gram) (minute/hour), where standard temperature (gram-mole per standard cubic meter) is 20°C.
      Cij, Coj = Concentration of sample component j of the gas stream at the inlet and outlet of the control device, respectively, dry basis, parts per million by volume.
      Mij, Moj = Molecular weight of sample component j of the gas stream at the inlet and outlet of the control device, respectively, gram/gram-mole.
      Qi, Qo = Flowrate of gas stream at the inlet and outlet of the control device, respectively, dry standard cubic meter per minute.
      n = Number of components in sample.
      (B) When calculating the TOC mass rate, you must sum all organic compounds (minus methane and ethane) measured by Method 25A, 40 CFR part 60, appendix A-7 using the equations in paragraph (b)(3)(ii)(A) of this section.
      (iii) You must calculate the percent reduction in TOC (minus methane and ethane) as follows:

Where:
      Rcd = Control efficiency of control device, percent.
      Ei = Mass rate of TOC (minus methane and ethane) at the inlet to the control device as calculated under paragraph (b)(3)(ii) of this section, kilograms TOC per hour or kilograms HAP per hour.
      Eo = Mass rate of TOC (minus methane and ethane) at the outlet of the control device, as calculated under paragraph (b)(3)(ii) of this section, kilograms TOC per hour per hour.
      (iv) If the vent stream entering a boiler or process heater with a design capacity less than 44 megawatts is introduced with the combustion air or as a secondary fuel, you must determine the weight-percent reduction of TOC (minus methane and ethane) across the device by comparing the TOC (minus methane and ethane) in all combusted vent streams and primary and secondary fuels with the TOC (minus methane and ethane) exiting the device, respectively.
      (4) You must use Method 25A, 40 CFR part 60, appendix A-7 to measure TOC (minus methane and ethane) to determine compliance with the enclosed combustion device total VOC concentration limit specified in section E.1(a)(1)(ii). You must calculate parts per million by volume concentration and correct to 3 percent oxygen, using the procedures in paragraphs (b)(4)(i) through (iii) of this section.
      (i) For each run, you must take either an integrated sample or a minimum of four grab samples per hour. If grab sampling is used, then the samples must be taken at approximately equal intervals in time, such as 15-minute intervals during the run.
      (ii) You must calculate the TOC concentration for each run as follows:

Where:
      CTOC = Concentration of total organic compounds minus methane and ethane, dry basis, parts per million by volume.
      Cji = Concentration of sample component j of sample I dry basis, parts per million by volume.
      n = Number of components in the sample.
      x = Number of samples in the sample run.
      (iii) You must correct the TOC concentration to 3 percent oxygen as specified in paragraphs (b)(4)(iii)(A) and (B) of this section.
      (A) You must use the emission rate correction factor for excess air, integrated sampling and analysis procedures of Method 3A or 3B at 40 CFR part 60, appendix A, ASTM D6522-00 (Reapproved 2005), or ANSI/ASME PTC 19.10-1981, Part 10 (manual portion only) (incorporated by reference as specified in §60.17) to determine the oxygen concentration. The samples must be taken during the same time that the samples are taken for determining TOC concentration.
      (B) You must correct the TOC concentration for percent oxygen as follows:

Where:
      Cc = TOC concentration corrected to 3 percent oxygen, dry basis, parts per million by volume.
      Cm = TOC concentration, dry basis, parts per million by volume.
      %O2d = Concentration of oxygen, dry basis, percent by volume.
      (5) You must conduct performance tests according to the schedule specified in paragraphs (b)(5)(i) and (ii) of this section.
      (i) You must conduct an initial performance test within 180 days after the compliance date for your source.
      (ii) You must conduct periodic performance tests for all control devices required to conduct initial performance tests except as specified in paragraphs (b)(5)(ii)(A) and (B) of this section. You must conduct the first periodic performance test no later than 60 months after the initial performance test required in paragraph (b)(5)(i) of this section. You must conduct subsequent periodic performance tests at intervals no longer than 60 months following the previous periodic performance test or whenever you desire to establish a new operating limit. Combustion control devices meeting the criteria in either paragraph (b)(5)(ii)(A) or (B) of this section are not required to conduct periodic performance tests.
      (A) A control device whose model is tested under, and meets the criteria of paragraph (d) of this section.
      (B) A combustion control device tested under paragraph (b) of this section that meets the outlet TOC performance level specified in section E.1(a)(1)(ii) and that establishes a correlation between firebox or combustion chamber temperature and the TOC performance level.
      (c) Control device design analysis to meet the requirements of section E.1(a). (1) For a condenser, the design analysis must include an analysis of the vent stream composition, constituent concentrations, flowrate, relative humidity, and temperature, and must establish the design outlet organic compound concentration level, design average temperature of the condenser exhaust vent stream, and the design average temperatures of the coolant fluid at the condenser inlet and outlet.
      (2) For a regenerable carbon adsorption system, the design analysis shall include the vent stream composition, constituent concentrations, flowrate, relative humidity, and temperature, and shall establish the design exhaust vent stream organic compound concentration level, adsorption cycle time, number and capacity of carbon beds, type and working capacity of activated carbon used for the carbon beds, design total regeneration stream flow over the period of each complete carbon bed regeneration cycle, design carbon bed temperature after regeneration, design carbon bed regeneration time, and design service life of the carbon.
      (3) For a non-regenerable carbon adsorption system, such as a carbon canister, the design analysis shall include the vent stream composition, constituent concentrations, flowrate, relative humidity, and temperature, and shall establish the design exhaust vent stream organic compound concentration level, capacity of the carbon bed, type and working capacity of activated carbon used for the carbon bed, and design carbon replacement interval based on the total carbon working capacity of the control device and source operating schedule. In addition, these systems will incorporate dual carbon canisters in case of emission breakthrough occurring in one canister.
      (4) If you and the regulated authority do not agree on a demonstration of control device performance using a design analysis, then you must perform a performance test in accordance with the requirements of paragraph (b) of this section to resolve the disagreement. The regulatory authority may choose to have an authorized representative observe the performance test.
      (d) Performance testing for combustion control devices -- manufacturers' performance test. (1) This paragraph applies to the performance testing of a combustion control device conducted by the device manufacturer. The manufacturer must demonstrate that a specific model of control device achieves the performance requirements in paragraph (d)(11) of this section by conducting a performance test as specified in paragraphs (d)(2) through (10) of this section. You must submit a test report for each combustion control device in accordance with the requirements in paragraph (d)(12) of this section.
      (2) Performance testing must consist of three one-hour (or longer) test runs for each of the four firing rate settings specified in paragraphs (d)(2)(i) through (iv) of this section, making a total of 12 test runs per test. Propene (propylene) gas must be used for the testing fuel. All fuel analyses must be performed by an independent third-party laboratory (not affiliated with the control device manufacturer or fuel supplier).
      (i) 90-100 percent of maximum design rate (fixed rate).
      (ii) 70-100-70 percent (ramp up, ramp down). Begin the test at 70 percent of the maximum design rate. During the first 5 minutes, incrementally ramp the firing rate to 100 percent of the maximum design rate. Hold at 100 percent for 5 minutes. In the 10-15 minute time range, incrementally ramp back down to 70 percent of the maximum design rate. Repeat three more times for a total of 60 minutes of sampling.
      (iii) 30-70-30 percent (ramp up, ramp down). Begin the test at 30 percent of the maximum design rate. During the first 5 minutes, incrementally ramp the firing rate to 70 percent of the maximum design rate. Hold at 70 percent for 5 minutes. In the 10-15 minute time range, incrementally ramp back down to 30 percent of the maximum design rate. Repeat three more times for a total of 60 minutes of sampling.
      (iv) 0-30-0 percent (ramp up, ramp down). Begin the test at the minimum firing rate. During the first 5 minutes, incrementally ramp the firing rate to 30 percent of the maximum design rate. Hold at 30 percent for 5 minutes. In the 10-15 minute time range, incrementally ramp back down to the minimum firing rate. Repeat three more times for a total of 60 minutes of sampling.
      (3) All models employing multiple enclosures must be tested simultaneously and with all burners operational. Results must be reported for each enclosure individually and for the average of the emissions from all interconnected combustion enclosures/chambers. Control device operating data must be collected continuously throughout the performance test using an electronic Data Acquisition System. A graphic presentation or strip chart of the control device operating data and emissions test data must be included in the test report in accordance with paragraph (d)(12) of this section. Inlet fuel meter data may be manually recorded provided that all inlet fuel data readings are included in the final report.
      (4) Inlet testing must be conducted as specified in paragraphs (d)(4)(i) and (ii) of this section.
      (i) The inlet gas flow metering system must be located in accordance with Method 2A, 40 CFR part 60, appendix A-1, (or other approved procedure) to measure inlet gas flow rate at the control device inlet location. You must position the fitting for filling fuel sample containers a minimum of eight pipe diameters upstream of any inlet gas flow monitoring meter.
      (ii) Inlet flow rate must be determined using Method 2A, 40 CFR part 60, appendix A-1. Record the start and stop reading for each 60-minute THC test. Record the gas pressure and temperature at 5-minute intervals throughout each 60-minute test.
      (5) Inlet gas sampling must be conducted as specified in paragraphs (d)(5)(i) and (ii) of this section.
      (i) At the inlet gas sampling location, securely connect a Silonite-coated stainless steel evacuated canister fitted with a flow controller sufficient to fill the canister over a 3-hour period. Filling must be conducted as specified in paragraphs (d)(5)(i)(A) through (C) of this section.
      (A) Open the canister sampling valve at the beginning of each test run, and close the canister at the end of each test run.
      (B) Fill one canister across the three test runs such that one composite fuel sample exists for each test condition.
      (C) Label the canisters individually and record sample information on a chain of custody form.
      (ii) Analyze each inlet gas sample using the methods in paragraphs (d)(5)(ii)(A) through (C) of this section. You must include the results in the test report required by paragraph (d)(12) of this section.
      (A) Hydrocarbon compounds containing between one and five atoms of carbon plus benzene using ASTM D1945-03.
      (B) Hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), nitrogen (N2), oxygen (O2) using ASTM D1945-03.
      (C) Higher heating value using ASTM D3588-98 or ASTM D4891-89.
      (6) Outlet testing must be conducted in accordance with the criteria in paragraphs (d)(6)(i) through (v) of this section.
      (i) Sample and flow rate must be measured in accordance with paragraphs (d)(6)(i)(A) through (B) of this section.
      (A) The outlet sampling location must be a minimum of four equivalent stack diameters downstream from the highest peak flame or any other flow disturbance, and a minimum of one equivalent stack diameter upstream of the exit or any other flow disturbance. A minimum of two sample ports must be used.
      (B) Flow rate must be measured using Method 1, 40 CFR part 60, appendix A-1 for determining flow measurement traverse point location, and Method 2, 40 CFR part 60, appendix A-1 for measuring duct velocity. If low flow conditions are encountered (i.e., velocity pressure differentials less than 0.05 inches of water) during the performance test, a more sensitive manometer must be used to obtain an accurate flow profile.
      (ii) Molecular weight and excess air must be determined as specified in paragraph (d)(7) of this section.
      (iii) Carbon monoxide must be determined as specified in paragraph (d)(8) of this section.
      (iv) THC must be determined as specified in paragraph (d)(9) of this section.
      (v) Visible emissions must be determined as specified in paragraph (d)(10) of this section.
      (7) Molecular weight and excess air determination must be performed as specified in paragraphs (d)(7)(i) through (iii) of this section.
      (i) An integrated bag sample must be collected during the Method 4, 40 CFR part 60, appendix A-3, moisture test following the procedure specified in paragraphs (d)(7)(i)(A) and (B) of this section. Analyze the bag sample using a gas chromatograph-thermal conductivity detector (GC-TCD) analysis meeting the criteria in paragraphs (d)(7)(i)(C) and (D) of this section.
      (A) Collect the integrated sample throughout the entire test, and collect representative volumes from each traverse location.
      (B) Purge the sampling line with stack gas before opening the valve and beginning to fill the bag. Clearly label each bag and record sample information on a chain of custody form.
      (C) The bag contents must be vigorously mixed prior to the gas chromatograph analysis.
      (D) The GC-TCD calibration procedure in Method 3C, 40 CFR part 60, appendix A, must be modified by using EPA Alt-045 as follows: For the initial calibration, triplicate injections of any single concentration must agree within 5 percent of their mean to be valid. The calibration response factor for a single concentration recheck must be within 10 percent of the original calibration response factor for that concentration. If this criterion is not met, repeat the initial calibration using at least three concentration levels.
      (ii) Calculate and report the molecular weight of oxygen, carbon dioxide, methane, and nitrogen in the integrated bag sample and include in the test report specified in paragraph (d)(12) of this section. Moisture must be determined using Method 4, 40 CFR part 60, appendix A-3. Traverse both ports with the Method 4, 40 CFR part 60, appendix A-3, sampling train during each test run. Ambient air must not be introduced into the Method 3C, 40 CFR part 60, appendix A-2, integrated bag sample during the port change.
      (iii) Excess air must be determined using resultant data from the EPA Method 3C tests and EPA Method 3B, 40 CFR part 60, appendix A, equation 3B-1.
      (8) Carbon monoxide must be determined using Method 10, 40 CFR part 60, appendix A. Run the test simultaneously with Method 25A, 40 CFR part 60, appendix A-7 using the same sampling points. An instrument range of 0-10 parts per million by volume-dry (ppmvd) is recommended.
      (9) Total hydrocarbon determination must be performed as specified by in paragraphs (d)(9)(i) through (vii) of this section.
      (i) Conduct THC sampling using Method 25A, 40 CFR part 60, appendix A-7, except that the option for locating the probe in the center 10 percent of the stack is not allowed. The THC probe must be traversed to 16.7 percent, 50 percent, and 83.3 percent of the stack diameter during each test run.
      (ii) A valid test must consist of three Method 25A, 40 CFR part 60, appendix A-7, tests, each no less than 60 minutes in duration.
      (iii) A 0-10 parts per million by volume-wet (ppmvw) (as propane) measurement range is preferred; as an alternative a 0-30 ppmvw (as carbon) measurement range may be used.
      (iv) Calibration gases must be propane in air and be certified through EPA Protocol 1 -- "EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards," September 1997, as amended August 25, 1999, EPA-600/R-97/121(or more recent if updated since 1999).
      (v) THC measurements must be reported in terms of ppmvw as propane.
      (vi) THC results must be corrected to 3 percent CO2, as measured by Method 3C, 40 CFR part 60, appendix A-2. You must use the following equation for this diluent concentration correction:

Where:
      Cmeas = The measured concentration of the pollutant.
      CO2meas = The measured concentration of the CO2 diluent.
      3 = The corrected reference concentration of CO2 diluent.
      Ccorr = The corrected concentration of the pollutant.
      (vii) Subtraction of methane or ethane from the THC data is not allowed in determining results.
      (10) Visible emissions must be determined using Method 22, 40 CFR part 60, appendix A. The test must be performed continuously during each test run. A digital color photograph of the exhaust point, taken from the position of the observer and annotated with date and time, must be taken once per test run and the 12 photos included in the test report specified in paragraph (d)(12) of this section.
      (11) Performance test criteria. (i) The control device model tested must meet the criteria in paragraphs (d)(11)(i)(A) through (D) of this section. These criteria must be reported in the test report required by paragraph (d)(12) of this section.
      (A) Method 22, 40 CFR part 60, appendix A, results under paragraph (d)(10) of this section with no indication of visible emissions.
      (B) Average Method 25A, 40 CFR part 60, appendix A, results under paragraph (d)(9) of this section equal to or less than 10.0 ppmvw THC as propane corrected to 3.0 percent CO2.
      (C) Average CO emissions determined under paragraph (d)(8) of this section equal to or less than 10 parts ppmvd, corrected to 3.0 percent CO2.
      (D) Excess combustion air determined under paragraph (d)(7) of this section equal to or greater than 150 percent.
      (ii) The manufacturer must determine a maximum inlet gas flow rate which must not be exceeded for each control device model to achieve the criteria in paragraph (d)(11)(iii) of this section. The maximum inlet gas flow rate must be included in the test report required by paragraph (d)(12) of this section.
      (iii) A control device meeting the criteria in paragraph (d)(11)(i)(A) through (D) of this section must demonstrate a destruction efficiency of 95 percent for VOC regulated under this rule.
      (12) The owner or operator of a combustion control device model tested under this paragraph must submit the information listed in paragraphs (d)(12)(i) through (vi) in the test report.  Owners or operators who claim that any of the performance test information being submitted is confidential business information (CBI) must submit a complete file including information claimed to be CBI, on a compact disc, flash drive, or other commonly used electronic storage media to the EPA. The electronic media must be clearly marked as CBI and mailed to Attn:  CBI Officer; OAQPS CBIO Room 521; 109 T.W. Alexander Drive; RTP, NC 27711. The same file with the CBI omitted must be submitted to<EMAIL_ADDRESS>      (i) A full schematic of the control device and dimensions of the device components.
      (ii) The maximum net heating value of the device.
      (iii) The test fuel gas flow range (in both mass and volume). Include the maximum allowable inlet gas flow rate.
      (iv) The air/stream injection/assist ranges, if used.
      (v) The test conditions listed in paragraphs (d)(12)(v)(A) through (O) of this section, as applicable for the tested model.
      (A) Fuel gas delivery pressure and temperature.
      (B) Fuel gas moisture range.
      (C) Purge gas usage range.
      (D) Condensate (liquid fuel) separation range.
      (E) Combustion zone temperature range. This is required for all devices that measure this parameter.
      (F) Excess combustion air range.
      (G) Flame arrestor(s).
      (H) Burner manifold.
      (I) Pilot flame indicator.
      (J) Pilot flame design fuel and calculated or measured fuel usage.
      (K) Tip velocity range.
      (L) Momentum flux ratio.
      (M) Exit temperature range.
      (N) Exit flow rate.
      (O) Wind velocity and direction.
      (vi) The test report must include all calibration quality assurance/quality control data, calibration gas values, gas cylinder certification, strip charts, or other graphic presentations of the data annotated with test times and calibration values.
      (e) Continuous compliance for combustion control devices tested by the manufacturer in accordance with paragraph (d) of this section. This paragraph applies to the demonstration of compliance for a combustion control device tested under the provisions in paragraph (d) of this section. Owners or operators must demonstrate that a control device achieves the performance requirements in (d)(11) of this section by installing a device tested under paragraph (d) of this section and complying with the criteria specified in paragraphs (e)(1) through (7) of this section.
      (1) The inlet gas flow rate must be equal to or less than the maximum specified by the manufacturer.
      (2) A pilot flame must be present at all times of operation.
      (3) Devices must be operated with no visible emissions, except for periods not to exceed a total of 1 minute during any 15-minute period. A visible emissions test conducted according to section 11 of EPA Method 22, 40 CFR part 60, appendix A, must be performed at least once every calendar month, separated by at least 15 days between each test. The observation period shall be 15 minutes.
      (4) Devices failing the visible emissions test must follow manufacturer's repair instructions, if available, or best combustion engineering practice as outlined in the unit inspection and maintenance plan, to return the unit to compliant operation. All inspection, repair and maintenance activities for each unit must be recorded in a maintenance and repair log and must be available for inspection.
      (5) Following return to operation from maintenance or repair activity, each device must pass an EPA Method 22, 40 CFR part 60, appendix A, visual observation as described in paragraph (e)(3) of this section.
      (6) If the owner or operator operates a combustion control device model tested under this section, an electronic copy of the performance test results required by this section shall be submitted via email to<EMAIL_ADDRESS>unless the test results for that model of combustion control device are posted at the following Web site: epa.gov/airquality/oilandgas/.

	(7) Ensure that each enclosed combustion control device is maintained in a leak free condition.

G	Equipment Component VOC Leaks at Natural Gas Processing Plants
G.1	Applicability
      (a) The group of all equipment, except compressors, within a process unit located at an onshore natural gas processing plant.
      (b) Equipment associated with a compressor station, dehydration unit, sweetening unit, underground storage vessel, field gas gathering system, or liquefied natural gas unit is covered by the requirements of section G.2 if it is located at an onshore natural gas processing plant. Equipment not located at the onshore natural gas processing plant site is exempt from the requirements of section G.2.
      (c) The equipment within a process unit subject to VOC emission control requirements located at onshore natural gas processing plants is exempt from this section if they are subject to and controlled according to subparts VVa, GGG or GGGa of 40 CFR part 60.
G.2	 What VOC Emission Requirements Apply to Equipment Components at a Natural Gas Processing Plant?
      (a) You must comply with the requirements of sections G.5.1 (a), (b), and (d), and sections G.5.4 through G.5.11, except as provided in section G.3.
      (b) You may elect to comply with the requirements of sections G.6.1 and G.6.2, as an alternative.
      (c) You must comply with the provisions of section G.7 of this section except as provided in paragraph (e) of this section.
      (d) You must comply with the provisions of section G.9.8 and G.9.9 of this section except as provided in section G.3.
      (e) You must use the following instead of section G.7(d)(1): Each piece of equipment is presumed to be in VOC service or in wet gas service unless an owner or operator demonstrates that the piece of equipment is not in VOC service or in wet gas service. For a piece of equipment to be considered not in VOC service, it must be determined that the VOC content can be reasonably expected never to exceed 10.0 percent by weight. For a piece of equipment to be considered in wet gas service, it must be determined that it contains or contacts the field gas before the extraction step in the process. For purposes of determining the percent VOC content of the process fluid that is contained in or contacts a piece of equipment, procedures that conform to the methods described in ASTM E169-93, E168-92, or E260-96 must be used.
G.3 	What Exceptions Apply to the Equipment Leak VOC Emission Control Requirements for Equipment Components at Natural Gas Processing Plants?
      (a) You may comply with the following exceptions to the provisions of section G.2(a) and (b).
      (b)(1) Each pressure relief device in gas/vapor service may be monitored quarterly and within 5 days after each pressure release to detect leaks by the methods specified in section G.7(b) except as provided in section G.2(c) and in paragraph (b)(4) of this section, and section G.5.4(a) through (c) of this rule.
      (2) If an instrument reading of 500 ppm or greater is measured, a leak is detected.
      (3)(i) When a leak is detected, it must be repaired as soon as practicable, but no later than 15 calendar days after it is detected, except as provided in section G.5.9.
      (ii) A first attempt at repair must be made no later than 5 calendar days after each leak is detected.
      (4)(i) Any pressure relief device that is located in a nonfractionating plant that is monitored only by non-plant personnel may be monitored after a pressure release the next time the monitoring personnel are on-site, instead of within 5 days as specified in paragraph (b)(1) of this section and section G.9.4(b)(1).
      (ii) No pressure relief device described in paragraph (b)(4)(i) of this section must be allowed to operate for more than 30 days after a pressure release without monitoring.
      (c) Sampling connection systems are exempt from the requirements of section G.5.9.
      (d) Pumps in light liquid service, valves in gas/vapor and light liquid service, pressure relief devices in gas/vapor service, and connectors in gas/vapor service and in light liquid service that are located at a non-fractionating plant that does not have the design capacity to process 283,200 standard cubic meters per day (scmd) (10 million standard cubic feet per day) or more of field gas are exempt from the routine monitoring requirements of sections G.5.2(a)(1), G.5.7 (a), G.5.11(a), and paragraph (b)(1) of this section.
      (e) Pumps in light liquid service, valves in gas/vapor and light liquid service, pressure relief devices in gas/vapor service, and connectors in gas/vapor service and in light liquid service within a process unit that is located in the Alaskan North Slope are exempt from the routine monitoring requirements of sections G.5.2 (a)(1), G.5.7(a), G.5.11(a), and paragraph (b)(1) of this section.
      (f) An owner or operator may use the following provisions instead of section G.7(e):
      (1) Equipment is in heavy liquid service if the weight percent evaporated is 10 percent or less at 150°C (302°F) as determined by ASTM Method D86-96.
      (2) Equipment is in light liquid service if the weight percent evaporated is greater than 10 percent at 150°C (302°F) as determined by ASTM Method D86-96.
      (g) An owner or operator may use the following provisions instead of section G.7(b)(2): A calibration drift assessment shall be performed, at a minimum, at the end of each monitoring day. Check the instrument using the same calibration gas(es) that were used to calibrate the instrument before use. Follow the procedures specified in USEPA Method 21 of appendix A-7 of this part, Section 10.1, except do not adjust the meter readout to correspond to the calibration gas value. Record the instrument reading for each scale used as specified in section G.8 (e)(8). Divide these readings by the initial calibration values for each scale and multiply by 100 to express the calibration drift as a percentage. If any calibration drift assessment shows a negative drift of more than 10 percent from the initial calibration value, then all equipment monitored since the last calibration with instrument readings below the appropriate leak definition and above the leak definition multiplied by (100 minus the percent of negative drift/divided by 100) must be re-monitored. If any calibration drift assessment shows a positive drift of more than 10 percent from the initial calibration value, then, at the owner/operator's discretion, all equipment since the last calibration with instrument readings above the appropriate leak definition and below the leak definition multiplied by (100 plus the percent of positive drift/divided by 100) may be re-monitored.
G.4	How Do I Demonstrate Initial and Continued Compliance with the VOC Emission Control Requirements for Equipment Components at Natural Gas Processing Plants?
      You must determine initial compliance with the standards for each equipment component subject to VOC emission control requirements by the compliance date specified by your regulatory authority by complying with the requirements specified in paragraphs (a) through (i) of this section.
      For equipment components subject to VOC emission control requirements at natural gas processing plants, initial and continuous compliance with the VOC requirements is demonstrated if you are in compliance with the requirements of section G.2.
G.5	What VOC Emission Control Requirements Apply to Equipment Components at Natural Gas Processing Plants
G.5.1	VOC Emission Control Requirements: General
      (a) Each owner or operator subject to the provisions of this rule shall demonstrate compliance with the requirements of sections G.5.1 through G.5.10 for all equipment within 180 days of the compliance date.
      (b) Compliance with sections G.5.1 to G.5.10 will be determined by review of records and reports, review of performance test results, and inspection using the methods and procedures specified in G.7.
      (c)(1) An owner or operator may request a determination of equivalence of a means of emission limitation to the requirements of sections G.5.2, G.5.3, G.5.5, G.5.6, G.5.7, G.5.8, and G.5.10.
      (2) If the permitting authority makes a determination that a means of emission limitation is at least equivalent to the requirements of sections G.5.2, G.5.3, G.5.5, G.5.6, G.5.7, G.5.8, or section G.5.10, an owner or operator shall comply with the requirements of that determination.
      (d) Equipment that is in vacuum service is excluded from the requirements of sections G.5.2 through G.5.10 if it is identified as required in section G.8(e)(5).
      (e) Equipment that an owner or operator designates as being in VOC service less than 300 hr/yr is excluded from the requirements of sections G.5.2 through G.5.11 if it is identified as required in section G.8(e)(6) and it meets any of the conditions specified in paragraphs (e)(1) through (3) of this section.
      (1) The equipment is in VOC service only during startup and shutdown, excluding startup and shutdown between batches of the same campaign for a batch process.
      (2) The equipment is in VOC service only during process malfunctions or other emergencies.
      (3) The equipment is backup equipment that is in VOC service only when the primary equipment is out of service.
      (f)(1) If a dedicated batch process unit operates less than 365 days during a year, an owner or operator may monitor to detect leaks from pumps, valves, and open-ended valves or lines at the frequency specified in the following table instead of monitoring as specified in sections G.5.2, G.5.7, and G.5.2:
                                Operating Time
                        (percent of hours during year)
                  Equivalent Monitoring Frequency Time in Use

                                    Monthly
                                   Quarterly
                                 Semiannually
                                  0 to <25
                                   Quarterly
                                   Annually
                                   Annually
                                 25 to <50
                                   Quarterly
                                 Semiannually
                                   Annually
                                 50 to <75
                                   Bimonthly
                                Three Quarters
                                 Semiannually
                                   75 to 100
                                    Monthly
                                   Quarterly
                                 Semiannually
      (2) Pumps and valves that are shared among two or more batch process units that are subject to this subpart may be monitored at the frequencies specified in paragraph (f)(1) of this section, provided the operating time of all such process units is considered.
      (3) The monitoring frequencies specified in paragraph (f)(1) of this section are not requirements for monitoring at specific intervals and can be adjusted to accommodate process operations. An owner or operator may monitor at any time during the specified monitoring period (e.g., month, quarter, year), provided the monitoring is conducted at a reasonable interval after completion of the last monitoring campaign. Reasonable intervals are defined in paragraphs (f)(3)(i) through (iv) of this section.
      (i) When monitoring is conducted quarterly, monitoring events must be separated by at least 30 calendar days.
      (ii) When monitoring is conducted semiannually (i.e., once every 2 quarters), monitoring events must be separated by at least 60 calendar days.
      (iii) When monitoring is conducted in 3 quarters per year, monitoring events must be separated by at least 90 calendar days.
      (iv) When monitoring is conducted annually, monitoring events must be separated by at least 120 calendar days.
      (g) If the storage vessel is shared with multiple process units, the process unit with the greatest annual amount of stored materials (predominant use) is the process unit the storage vessel is assigned to. If the storage vessel is shared equally among process units, and one of the process units has equipment subject to this subpart, the storage vessel is assigned to that process unit. If the storage vessel is shared equally among process units, none of which have equipment subject to this subpart of this part, the storage vessel is assigned to any process unit subject to subpart VV of this part. If the predominant use of the storage vessel varies from year to year, then the owner or operator must estimate the predominant use initially and reassess every 3 years. The owner or operator must keep records of the information and supporting calculations that show how predominant use is determined. All equipment on the storage vessel must be monitored when in VOC service.
G.5.2	What Equipment Component VOC Emission Control Requirements Apply to Pumps in Light Liquid Service?
      (a)(1) Each pump in light liquid service shall be monitored monthly to detect leaks by the methods specified in section G.7(b), except as provided in sections G.5.1(c) and (f) and paragraphs (d), (e), and (f) of this section. A pump that begins operation in light liquid service after the compliance date for the process unit must be monitored for the first time within 30 days after the end of its startup period, except for a pump that replaces a leaking pump and except as provided in section G.5.1(c) and paragraphs (d), (e), and (f) of this section.
      (2) Each pump in light liquid service shall be checked by visual inspection each calendar week for indications of liquids dripping from the pump seal, except as provided in section G.5.1(f).
      (b)(1) The instrument reading that defines a leak is specified in paragraphs (b)(1)(i) and (ii) of this section.
      (i) 5,000 parts per million (ppm) or greater for pumps handling polymerizing monomers;
      (ii) 2,000 ppm or greater for all other pumps.
      (2) If there are indications of liquids dripping from the pump seal, the owner or operator shall follow the procedure specified in either paragraph (b)(2)(i) or (ii) of this section. This requirement does not apply to a pump that was monitored after a previous weekly inspection and the instrument reading was less than the concentration specified in paragraph (b)(1)(i) or (ii) of this section, whichever is applicable.
      (i) Monitor the pump within 5 days as specified in section G.7(b). A leak is detected if the instrument reading measured during monitoring indicates a leak as specified in paragraph (b)(1)(i) or (ii) of this section, whichever is applicable. The leak shall be repaired using the procedures in paragraph (c) of this section.
      (ii) Designate the visual indications of liquids dripping as a leak, and repair the leak using either the procedures in paragraph (c) of this section or by eliminating the visual indications of liquids dripping.
      (c)(1) When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided in section G.5.9.
      (2) A first attempt at repair shall be made no later than 5 calendar days after each leak is detected. First attempts at repair include, but are not limited to, the practices described in paragraphs (c)(2)(i) and (ii) of this section, where practicable.
      (i) Tightening the packing gland nuts;
      (ii) Ensuring that the seal flush is operating at design pressure and temperature.
      (d) Each pump equipped with a dual mechanical seal system that includes a barrier fluid system is exempt from the requirements of paragraph (a) of this section, provided the requirements specified in paragraphs (d)(1) through (6) of this section are met.
      (1) Each dual mechanical seal system is:
      (i) Operated with the barrier fluid at a pressure that is at all times greater than the pump stuffing box pressure; or
      (ii) Equipped with a barrier fluid degassing reservoir that is routed to a process or fuel gas system or connected by a closed vent system to a control device that complies with the requirements of section G.5.10; or
      (iii) Equipped with a system that purges the barrier fluid into a process stream with zero VOC emissions to the atmosphere.
      (2) The barrier fluid system is in heavy liquid service or is not in VOC service.
      (3) Each barrier fluid system is equipped with a sensor that will detect failure of the seal system, the barrier fluid system, or both.
      (4)(i) Each pump is checked by visual inspection, each calendar week, for indications of liquids dripping from the pump seals.
      (ii) If there are indications of liquids dripping from the pump seal at the time of the weekly inspection, the owner or operator shall follow the procedure specified in either paragraph (d)(4)(ii)(A) or (B) of this section prior to the next required inspection.
      (A) Monitor the pump within 5 days as specified in section G.7(b) to determine if there is a leak of VOC in the barrier fluid. If an instrument reading of 2,000 ppm or greater is measured, a leak is detected.
      (B) Designate the visual indications of liquids dripping as a leak.
      (5)(i) Each sensor as described in paragraph (d)(3) is checked daily or is equipped with an audible alarm.
      (ii) The owner or operator determines, based on design considerations and operating experience, a criterion that indicates failure of the seal system, the barrier fluid system, or both.
      (iii) If the sensor indicates failure of the seal system, the barrier fluid system, or both, based on the criterion established in paragraph (d)(5)(ii) of this section, a leak is detected.
      (6)(i) When a leak is detected pursuant to paragraph (d)(4)(ii)(A) of this section, it shall be repaired as specified in paragraph (c) of this section.
      (ii) A leak detected pursuant to paragraph (d)(5)(iii) of this section shall be repaired within 15 days of detection by eliminating the conditions that activated the sensor.
      (iii) A designated leak pursuant to paragraph (d)(4)(ii)(B) of this section shall be repaired within 15 days of detection by eliminating visual indications of liquids dripping.
      (e) Any pump that is designated, as described in section G.8(e)(1) and (2), for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of paragraphs (a), (c), and (d) of this section if the pump:
      (1) Has no externally actuated shaft penetrating the pump housing;
      (2) Is demonstrated to be operating with no detectable emissions as indicated by an instrument reading of less than 500 ppm above background as measured by the methods specified in section G.7(c); and
      (3) Is tested for compliance with paragraph (e)(2) of this section initially upon designation, annually, and at other times requested by the permitting authority
      (f) If any pump is equipped with a closed vent system capable of capturing and transporting any leakage from the seal or seals to a process or to a fuel gas system or to a control device that complies with the requirements of section G.5.10, it is exempt from paragraphs (a) through (e) of this section.
      (g) Any pump that is designated, as described in section G.8(f)(1), as an unsafe-to-monitor pump is exempt from the monitoring and inspection requirements of paragraphs (a) and (d)(4) through (6) of this section if:
      (1) The owner or operator of the pump demonstrates that the pump is unsafe-to-monitor because monitoring personnel would be exposed to an immediate danger as a consequence of complying with paragraph (a) of this section; and
      (2) The owner or operator of the pump has a written plan that requires monitoring of the pump as frequently as practicable during safe-to-monitor times, but not more frequently than the periodic monitoring schedule otherwise applicable, and repair of the equipment according to the procedures in paragraph (c) of this section if a leak is detected.
      (h) Any pump that is located within the boundary of an unmanned plant site is exempt from the weekly visual inspection requirement of paragraphs (a)(2) and (d)(4) of this section, and the daily requirements of paragraph (d)(5) of this section, provided that each pump is visually inspected as often as practicable and at least monthly.
G.5.3	What Equipment Component VOC Emission Control Requirements Apply to Compressors?
      (a) Each compressor shall be equipped with a seal system that includes a barrier fluid system and that prevents leakage of VOC to the atmosphere, except as provided in section G.5.1(c) and paragraphs (h), (i), and (j) of this section.
      (b) Each compressor seal system as required in paragraph (a) of this section shall be:
      (1) Operated with the barrier fluid at a pressure that is greater than the compressor stuffing box pressure; or
      (2) Equipped with a barrier fluid system degassing reservoir that is routed to a process or fuel gas system or connected by a closed vent system to a control device that complies with the requirements of section G.5.10; or
      (3) Equipped with a system that purges the barrier fluid into a process stream with zero VOC emissions to the atmosphere.
      (c) The barrier fluid system shall be in heavy liquid service or shall not be in VOC service.
      (d) Each barrier fluid system as described in paragraph (a) shall be equipped with a sensor that will detect failure of the seal system, barrier fluid system, or both.
      (e)(1) Each sensor as required in paragraph (d) of this section shall be checked daily or shall be equipped with an audible alarm.
      (2) The owner or operator shall determine, based on design considerations and operating experience, a criterion that indicates failure of the seal system, the barrier fluid system, or both.
      (f) If the sensor indicates failure of the seal system, the barrier system, or both based on the criterion determined under paragraph (e)(2) of this section, a leak is detected.
      (g)(1) When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided in section G.5.9.
      (2) A first attempt at repair shall be made no later than 5 calendar days after each leak is detected.
      (h) A compressor is exempt from the requirements of paragraphs (a) and (b) of this section, if it is equipped with a closed vent system to capture and transport leakage from the compressor drive shaft back to a process or fuel gas system or to a control device that complies with the requirements of section G.5.10, except as provided in paragraph (i) of this section.
      (i) Any compressor that is designated, as described in section G.8(e)(1) and (2), for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of paragraphs (a) through (h) of this section if the compressor:
      (1) Is demonstrated to be operating with no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as measured by the methods specified in section G.7(c); and
      (2) Is tested for compliance with paragraph (i)(1) of this section initially upon designation, annually, and at other times requested by the permitting authority.
G.5.4	What Equipment Component VOC Emission Control Requirements Apply to Pressure Relief Devices in Gas/Vapor Service?
      (a) Except during pressure releases, each pressure relief device in gas/vapor service shall be operated with no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as determined by the methods specified in section G.7(c).
      (b)(1) After each pressure release, the pressure relief device shall be returned to a condition of no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as soon as practicable, but no later than 5 calendar days after the pressure release, except as provided in section G.5.9.
      (2) No later than 5 calendar days after the pressure release, the pressure relief device shall be monitored to confirm the conditions of no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, by the methods specified in section G.7(c).
      (c) Any pressure relief device that is routed to a process or fuel gas system or equipped with a closed vent system capable of capturing and transporting leakage through the pressure relief device to a control device as described in section G.5.10 is exempted from the requirements of paragraphs (a) and (b) of this section.
      (d)(1) Any pressure relief device that is equipped with a rupture disk upstream of the pressure relief device is exempt from the requirements of paragraphs (a) and (b) of this section, provided the owner or operator complies with the requirements in paragraph (d)(2) of this section.
      (2) After each pressure release, a new rupture disk shall be installed upstream of the pressure relief device as soon as practicable, but no later than 5 calendar days after each pressure release, except as provided in section G.5.9.
G.9.5	What Equipment Component VOC Emission Control Requirements Apply to Sampling Connection Systems?
      (a) Each sampling connection system shall be equipped with a closed-purge, closed-loop, or closed-vent system, except as provided in section G.5.1(c) and paragraph (c) of this section.
      (b) Each closed-purge, closed-loop, or closed-vent system as required in paragraph (a) of this section shall comply with the requirements specified in paragraphs (b)(1) through (4) of this section.
      (1) Gases displaced during filling of the sample container are not required to be collected or captured.
      (2) Containers that are part of a closed-purge system must be covered or closed when not being filled or emptied.
      (3) Gases remaining in the tubing or piping between the closed-purge system valve(s) and sample container valve(s) after the valves are closed and the sample container is disconnected are not required to be collected or captured.
      (4) Each closed-purge, closed-loop, or closed-vent system shall be designed and operated to meet requirements in either paragraph (b)(4)(i), (ii), (iii), or (iv) of this section.
      (i) Return the purged process fluid directly to the process line.
      (ii) Collect and recycle the purged process fluid to a process.
      (iii) Capture and transport all the purged process fluid to a control device that complies with the requirements of section G.5.10.
      (iv) Collect, store, and transport the purged process fluid to any of the following systems or facilities:
      (A) A waste management unit as defined in 40 CFR 63.111, if the waste management unit is subject to and operated in compliance with the provisions of 40 CFR part 63, subpart G, applicable to Group 1 wastewater streams;
      (B) A treatment, storage, or disposal facility subject to regulation under 40 CFR part 262, 264, 265, or 266;
      (C) A facility permitted, licensed, or registered by a state to manage municipal or industrial solid waste, if the process fluids are not hazardous waste as defined in 40 CFR part 261;
      (D) A waste management unit subject to and operated in compliance with the treatment requirements of 40 CFR 61.348(a), provided all waste management units that collect, store, or transport the purged process fluid to the treatment unit are subject to and operated in compliance with the management requirements of 40 CFR 61.343 through 40 CFR 61.347; or
      (E) A device used to burn off-specification used oil for energy recovery in accordance with 40 CFR part 279, subpart G, provided the purged process fluid is not hazardous waste as defined in 40 CFR part 261.
      (c) In-situ sampling systems and sampling systems without purges are exempt from the requirements of paragraphs (a) and (b) of this section.
G.5.6	What Equipment Component VOC Emission Control Requirements Apply to Open-Ended Valves or Lines?
      (a)(1) Each open-ended valve or line shall be equipped with a cap, blind flange, plug, or a second valve, except as provided in section G.5.1(c) and paragraphs (d) and (e) of this section.
      (2) The cap, blind flange, plug, or second valve shall seal the open end at all times except during operations requiring process fluid flow through the open-ended valve or line.
      (b) Each open-ended valve or line equipped with a second valve shall be operated in a manner such that the valve on the process fluid end is closed before the second valve is closed.
      (c) When a double block-and-bleed system is being used, the bleed valve or line may remain open during operations that require venting the line between the block valves but shall comply with paragraph (a) of this section at all other times.
      (d) Open-ended valves or lines in an emergency shutdown system which are designed to open automatically in the event of a process upset are exempt from the requirements of paragraphs (a), (b), and (c) of this section.
      (e) Open-ended valves or lines containing materials which would auto-catalytically polymerize or would present an explosion, serious overpressure, or other safety hazard if capped or equipped with a double block and bleed system as specified in paragraphs (a) through (c) of this section are exempt from the requirements of paragraphs (a) through (c) of this section.
G.5.7	What Equipment Component VOC Emission Control Requirements Apply to Valves in Gas/Vapor Service and in Light Liquid Service?
      (a)(1) Each valve shall be monitored monthly to detect leaks by the methods specified in G.7(b) and shall comply with paragraphs (b) through (e) of this section, except as provided in paragraphs (f), (g), and (h) of this section, section G.5.1(c) and (f), and sections G.6.1 and G.6.2.
      (2) A valve that begins operation in gas/vapor service or light liquid service after the compliance date for the process unit must be monitored according to paragraphs (a)(2)(i) or (ii), except for a valve that replaces a leaking valve and except as provided in paragraphs (f), (g), and (h) of this section, section G.5.1(c), and sections G.6.1 and G.6.2.
      (i) Monitor the valve as in paragraph (a)(1) of this section. The valve must be monitored for the first time within 30 days after the end of its startup period to ensure proper installation.
      (ii) If the existing valves in the process unit are monitored in accordance with section G.6.1 or section G.6.2, count the new valve as leaking when calculating the percentage of valves leaking as described in section G.6.2(b)(5). If less than 2.0 percent of the valves are leaking for that process unit, the valve must be monitored for the first time during the next scheduled monitoring event for existing valves in the process unit or within 90 days, whichever comes first.
      (b) If an instrument reading of 500 ppm or greater is measured, a leak is detected.
      (c)(1)(i) Any valve for which a leak is not detected for 2 successive months may be monitored the first month of every quarter, beginning with the next quarter, until a leak is detected.
      (ii) As an alternative to monitoring all of the valves in the first month of a quarter, an owner or operator may elect to subdivide the process unit into two or three subgroups of valves and monitor each subgroup in a different month during the quarter, provided each subgroup is monitored every 3 months. The owner or operator must keep records of the valves assigned to each subgroup.
      (2) If a leak is detected, the valve shall be monitored monthly until a leak is not detected for 2 successive months.
      (d)(1) When a leak is detected, it shall be repaired as soon as practicable, but no later than 15 calendar days after the leak is detected, except as provided in section G.5.9.
      (2) A first attempt at repair shall be made no later than 5 calendar days after each leak is detected.
      (e) First attempts at repair include, but are not limited to, the following best practices where practicable:
      (1) Tightening of bonnet bolts;
      (2) Replacement of bonnet bolts;
      (3) Tightening of packing gland nuts;
      (4) Injection of lubricant into lubricated packing.
      (f) Any valve that is designated, as described in section G.8(e)(2), for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of paragraph (a) of this section if the valve:
      (1) Has no external actuating mechanism in contact with the process fluid,
      (2) Is operated with emissions less than 500 ppm above background as determined by the method specified in section G.7(c), and
      (3) Is tested for compliance with paragraph (f)(2) of this section initially upon designation, annually, and at other times requested by the permitting authority.
      (g) Any valve that is designated, as described in section G.8(f)(1), as an unsafe-to-monitor valve is exempt from the requirements of paragraph (a) of this section if:
      (1) The owner or operator of the valve demonstrates that the valve is unsafe to monitor because monitoring personnel would be exposed to an immediate danger as a consequence of complying with paragraph (a) of this section, and
      (2) The owner or operator of the valve adheres to a written plan that requires monitoring of the valve as frequently as practicable during safe-to-monitor times.
      (h) Any valve that is designated, as described in section G.8(f)(2), as a difficult-to-monitor valve is exempt from the requirements of paragraph (a) of this section if:
      (1) The owner or operator of the valve demonstrates that the valve cannot be monitored without elevating the monitoring personnel more than 2 meters above a support surface.
      (2) The process unit within which the valve is located either has less than 3.0 percent of its total number of valves designated as difficult-to-monitor by the owner or operator.
      (3) The owner or operator of the valve follows a written plan that requires monitoring of the valve at least once per calendar year.
G.5.8	What Equipment Component VOC Emission Control Requirements Apply to Pumps, Valves, and Connectors in Heavy Liquid Service and Pressure Relief Devices in Light Liquid or Heavy Liquid Service?
      (a) If evidence of a potential leak is found by visual, audible, olfactory, or any other detection method at pumps, valves, and connectors in heavy liquid service and pressure relief devices in light liquid or heavy liquid service, the owner or operator shall follow either one of the following procedures:
      (1) The owner or operator shall monitor the equipment within 5 days by the method specified in section G.7(b) and shall comply with the requirements of paragraphs (b) through (d) of this section.
      (2) The owner or operator shall eliminate the visual, audible, olfactory, or other indication of a potential leak within 5 calendar days of detection.
      (b) If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.
      (c)(1) When a leak is detected, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided in section G.5.9.
      (2) The first attempt at repair shall be made no later than 5 calendar days after each leak is detected.
      (d) First attempts at repair include, but are not limited to, the best practices described under sections G.5.2(c)(2) and G.5.7(e).
G.5.9	What Delay of Repair of Equipment Component Requirements Apply When Equipment Component Leaks Have Been Detected?
      (a) Delay of repair of equipment for which leaks have been detected will be allowed if repair within 15 days is technically infeasible without a process unit shutdown. Repair of this equipment shall occur before the end of the next process unit shutdown. Monitoring to verify repair must occur within 15 days after startup of the process unit.
      (b) Delay of repair of equipment will be allowed for equipment which is isolated from the process and which does not remain in VOC service.
      (c) Delay of repair for valves and connectors will be allowed if:
      (1) The owner or operator demonstrates that emissions of purged material resulting from immediate repair are greater than the fugitive emissions likely to result from delay of repair, and
      (2) When repair procedures are effected, the purged material is collected and destroyed or recovered in a control device complying with section G.5.10.
      (d) Delay of repair for pumps will be allowed if:
      (1) Repair requires the use of a dual mechanical seal system that includes a barrier fluid system, and
      (2) Repair is completed as soon as practicable, but not later than 6 months after the leak was detected.
      (e) Delay of repair beyond a process unit shutdown will be allowed for a valve, if valve assembly replacement is necessary during the process unit shutdown, valve assembly supplies have been depleted, and valve assembly supplies had been sufficiently stocked before the supplies were depleted. Delay of repair beyond the next process unit shutdown will not be allowed unless the next process unit shutdown occurs sooner than 6 months after the first process unit shutdown.
      (f) When delay of repair is allowed for a leaking pump, valve, or connector that remains in service, the pump, valve, or connector may be considered to be repaired and no longer subject to delay of repair requirements if two consecutive monthly monitoring instrument readings are below the leak definition.
G.5.10	What VOC Emission Control Requirements Apply for Closed Vent Systems and Control Devices?
      (a) Owners or operators of closed vent systems and control devices used to comply with provisions of this rule shall comply with the provisions of this section.
      (b) Vapor recovery systems (for example, condensers and absorbers) shall be designed and operated to recover the VOC emissions vented to them with an efficiency of 95 percent or greater.
      (c) Each enclosed combustion device (e.g., thermal vapor incinerator, catalytic vapor incinerator, boiler, or process heater) shall be designed to reduce the mass content of VOC emissions by 95 percent or greater in accordance with the requirements of section F(b).
      (d) Flares used to comply with this subpart shall comply with the requirements of §60.18.
      (e) Owners or operators of control devices used to comply with the provisions of this rule shall monitor these control devices to ensure that they are operated and maintained in conformance with their designs.
      (f) Except as provided in paragraphs (i) through (k) of this section, each closed vent system shall be inspected according to the procedures and schedule specified in paragraphs (f)(1) and (2) of this section.
      (1) If the vapor collection system or closed vent system is constructed of hard-piping, the owner or operator shall comply with the requirements specified in paragraphs (f)(1)(i) and (ii) of this section:
      (i) Conduct an initial inspection according to the procedures in section G.7 (b); and
      (ii) Conduct annual visual inspections for visible, audible, or olfactory indications of leaks.
      (2) If the vapor collection system or closed vent system is constructed of ductwork, the owner or operator shall:
      (i) Conduct an initial inspection according to the procedures in section G.7(b); and
      (ii) Conduct annual inspections according to the procedures in section G.7 (b).
      (g) Leaks, as indicated by an instrument reading greater than 500 ppmv above background or by visual inspections, shall be repaired as soon as practicable except as provided in paragraph (h) of this section.
      (1) A first attempt at repair shall be made no later than 5 calendar days after the leak is detected.
      (2) Repair shall be completed no later than 15 calendar days after the leak is detected.
      (h) Delay of repair of a closed vent system for which leaks have been detected is allowed if the repair is technically infeasible without a process unit shutdown or if the owner or operator determines that emissions resulting from immediate repair would be greater than the fugitive emissions likely to result from delay of repair. Repair of such equipment shall be complete by the end of the next process unit shutdown.
      (i) If a vapor collection system or closed vent system is operated under a vacuum, it is exempt from the inspection requirements of paragraphs (f)(1)(i) and (f)(2) of this section.
      (j) Any parts of the closed vent system that are designated, as described in paragraph (l)(1) of this section, as unsafe to inspect are exempt from the inspection requirements of paragraphs (f)(1)(i) and (f)(2) of this section if they comply with the requirements specified in paragraphs (j)(1) and (2) of this section:
      (1) The owner or operator determines that the equipment is unsafe to inspect because inspecting personnel would be exposed to an imminent or potential danger as a consequence of complying with paragraphs (f)(1)(i) or (f)(2) of this section; and
      (2) The owner or operator has a written plan that requires inspection of the equipment as frequently as practicable during safe-to-inspect times.
      (k) Any parts of the closed vent system that are designated, as described in paragraph (l)(2) of this section, as difficult to inspect are exempt from the inspection requirements of paragraphs (f)(1)(i) and (f)(2) of this section if they comply with the requirements specified in paragraphs (k)(1) through (3) of this section:
      (1) The owner or operator determines that the equipment cannot be inspected without elevating the inspecting personnel more than 2 meters above a support surface; and
      (2) The owner or operator designates less than 3.0 percent of the total number of closed vent system equipment as difficult to inspect; and
      (3) The owner or operator has a written plan that requires inspection of the equipment at least once every 5 years. A closed vent system is exempt from inspection if it is operated under a vacuum.
      (l) The owner or operator shall record the information specified in paragraphs (l)(1) through (5) of this section.
      (1) Identification of all parts of the closed vent system that are designated as unsafe to inspect, an explanation of why the equipment is unsafe to inspect, and the plan for inspecting the equipment.
      (2) Identification of all parts of the closed vent system that are designated as difficult to inspect, an explanation of why the equipment is difficult to inspect, and the plan for inspecting the equipment.
      (3) For each inspection during which a leak is detected, a record of the information specified in section G.8 (c).
      (4) For each inspection conducted in accordance with section G.7 (b) during which no leaks are detected, a record that the inspection was performed, the date of the inspection, and a statement that no leaks were detected.
      (5) For each visual inspection conducted in accordance with paragraph (f)(1)(ii) of this section during which no leaks are detected, a record that the inspection was performed, the date of the inspection, and a statement that no leaks were detected.
      (m) Closed vent systems and control devices used to comply with provisions of this rule shall be operated at all times when emissions may be vented to them.
G.5.11	What VOC Emission Control Requirements Apply to Connectors in Gas/Vapor Service and in Light Liquid Service?
      (a) The owner or operator shall initially monitor all connectors in the process unit for leaks by the later of either 12 months after the compliance date. If all connectors in the process unit have been monitored for leaks prior to the compliance date, no initial monitoring is required provided either no process changes have been made since the monitoring or the owner or operator can determine that the results of the monitoring, with or without adjustments, reliably demonstrate compliance despite process changes. If required to monitor because of a process change, the owner or operator is required to monitor only those connectors involved in the process change.
      (b) Except as allowed in sections G.5.1(c) and G.5.10, or as specified in paragraph (e) of this section, the owner or operator shall monitor all connectors in gas and vapor and light liquid service as specified in paragraphs (a) and (b)(3) of this section.
      (1) The connectors shall be monitored to detect leaks by the method specified in section G.7 (b) and, as applicable, section G.7(c).
      (2) If an instrument reading greater than or equal to 500 ppm is measured, a leak is detected.
      (3) The owner or operator shall perform monitoring, subsequent to the initial monitoring required in paragraph (a) of this section, as specified in paragraphs (b)(3)(i) through (iii) of this section, and shall comply with the requirements of paragraphs (b)(3)(iv) and (v) of this section. The required period in which monitoring must be conducted shall be determined from paragraphs (b)(3)(i) through (iii) of this section using the monitoring results from the preceding monitoring period. The percent leaking connectors shall be calculated as specified in paragraph (c) of this section.
      (i) If the percent leaking connectors in the process unit was greater than or equal to 0.5 percent, then monitor within 12 months (1 year).
      (ii) If the percent leaking connectors in the process unit was greater than or equal to 0.25 percent but less than 0.5 percent, then monitor within 4 years. An owner or operator may comply with the requirements of this paragraph by monitoring at least 40 percent of the connectors within 2 years of the start of the monitoring period, provided all connectors have been monitored by the end of the 4-year monitoring period.
      (iii) If the percent leaking connectors in the process unit was less than 0.25 percent, then monitor as provided in paragraph (b)(3)(iii)(A) of this section and either paragraph (b)(3)(iii)(B) or (b)(3)(iii)(C) of this section, as appropriate.
      (A) An owner or operator shall monitor at least 50 percent of the connectors within 4 years of the start of the monitoring period.
      (B) If the percent of leaking connectors calculated from the monitoring results in paragraph (b)(3)(iii)(A) of this section is greater than or equal to 0.35 percent of the monitored connectors, the owner or operator shall monitor as soon as practical, but within the next 6 months, all connectors that have not yet been monitored during the monitoring period. At the conclusion of monitoring, a new monitoring period shall be started pursuant to paragraph (b)(3) of this section, based on the percent of leaking connectors within the total monitored connectors.
      (C) If the percent of leaking connectors calculated from the monitoring results in paragraph (b)(3)(iii)(A) of this section is less than 0.35 percent of the monitored connectors, the owner or operator shall monitor all connectors that have not yet been monitored within 8 years of the start of the monitoring period.
      (iv) If, during the monitoring conducted pursuant to paragraphs (b)(3)(i) through (iii) of this section, a connector is found to be leaking, it shall be re-monitored once within 90 days after repair to confirm that it is not leaking.
      (v) The owner or operator shall keep a record of the start date and end date of each monitoring period under this section for each process unit.
      (c) For use in determining the monitoring frequency, as specified in paragraphs (a) and (b)(3) of this section, the percent leaking connectors as used in paragraphs (a) and (b)(3) of this section shall be calculated by using the following equation:
                              %CL = CL / Ct * 100

Where:
      %CL = Percent of leaking connectors as determined through periodic monitoring required in paragraphs (a) and (b)(3)(i) through (iii) of this section.
      CL = Number of connectors measured at 500 ppm or greater, by the method specified in X.G.7(b).
      Ct = Total number of monitored connectors in the process unit.
      (d) When a leak is detected pursuant to paragraphs (a) and (b) of this section, it shall be repaired as soon as practicable, but not later than 15 calendar days after it is detected, except as provided in section G.5.9. A first attempt at repair as defined in this rule shall be made no later than 5 calendar days after the leak is detected.
      (e) Any connector that is designated, as described in section G.8(f)(1), as an unsafe-to-monitor connector is exempt from the requirements of paragraphs (a) and (b) of this section if:
      (1) The owner or operator of the connector demonstrates that the connector is unsafe-to-monitor because monitoring personnel would be exposed to an immediate danger as a consequence of complying with paragraphs (a) and (b) of this section; and
      (2) The owner or operator of the connector has a written plan that requires monitoring of the connector as frequently as practicable during safe-to-monitor times, but not more frequently than the periodic monitoring schedule otherwise applicable, and repair of the equipment according to the procedures in paragraph (d) of this section if a leak is detected.
      (f) Inaccessible, ceramic, or ceramic-lined connectors. (1) Any connector that is inaccessible or that is ceramic or ceramic-lined (e.g., porcelain, glass, or glass-lined), is exempt from the monitoring requirements of paragraphs (a) and (b) of this section, from the leak repair requirements of paragraph (d) of this section, and from recordkeeping and reporting requirements. An inaccessible connector is one that meets any of the provisions specified in paragraphs (f)(1)(i) through (vi) of this section, as applicable:
      (i) Buried;
      (ii) Insulated in a manner that prevents access to the connector by a monitor probe;
      (iii) Obstructed by equipment or piping that prevents access to the connector by a monitor probe;
      (iv) Unable to be reached from a wheeled scissor-lift or hydraulic-type scaffold that would allow access to connectors up to 7.6 meters (25 feet) above the ground;
      (v) Inaccessible because it would require elevating the monitoring personnel more than 2 meters (7 feet) above a permanent support surface or would require the erection of scaffold; or
      (vi) Not able to be accessed at any time in a safe manner to perform monitoring. Unsafe access includes, but is not limited to, the use of a wheeled scissor-lift on unstable or uneven terrain, the use of a motorized man-lift basket in areas where an ignition potential exists, or access would require near proximity to hazards such as electrical lines, or would risk damage to equipment.
      (2) If any inaccessible, ceramic, or ceramic-lined connector is observed by visual, audible, olfactory, or other means to be leaking, the visual, audible, olfactory, or other indications of a leak to the atmosphere shall be eliminated as soon as practical.
      (g) Except for instrumentation systems and inaccessible, ceramic, or ceramic-lined connectors meeting the provisions of paragraph (f) of this section, identify the connectors subject to the requirements of this rule. Connectors need not be individually identified if all connectors in a designated area or length of pipe subject to the provisions of this rule are identified as a group, and the number of connectors subject to the requirements is indicated.
G.6	Alternative Standards
G.6.1	Alternative Standards for Valves -- Allowable Percentage of Valves Leaking
      (a) An owner or operator may elect to comply with an allowable percentage of valves leaking of equal to or less than 2.0 percent.
      (b) The following requirements shall be met if an owner or operator wishes to comply with an allowable percentage of valves leaking:
      (1) An owner or operator must notify the permitting authority that the owner or operator has elected to comply with the allowable percentage of valves leaking before implementing this alternative standard, as specified in section G.9(d).
      (2) A performance test as specified in paragraph (c) of this section shall be conducted initially upon designation, annually, and at other times requested by the permitting authority.
      (3) If a valve leak is detected, it shall be repaired in accordance with section G.5.7(d) and (e).
      (c) Performance tests shall be conducted in the following manner:
      (1) All valves in gas/vapor and light liquid service within the natural gas processing plant subject to VOC emission control requirements shall be monitored within 1 week by the methods specified in section G.7(b).
      (2) If an instrument reading of 500 ppm or greater is measured, a leak is detected.
      (3) The leak percentage shall be determined by dividing the number of valves for which leaks are detected by the number of valves in gas/vapor and light liquid service within the natural gas processing plant subject to VOC emission control requirements.
      (d) Owners and operators who elect to comply with this alternative standard shall not have a natural gas processing plant subject to the equipment component VOC emission control requirements with a leak percentage greater than 2.0 percent, determined as described in section G.7(h).
G.6.2	Alternative Standards for Valves -- Skip Period Leak Detection and Repair
      (a)(1) An owner or operator may elect to comply with one of the alternative work practices specified in paragraphs (b)(2) and (3) of this section.
      (2) An owner or operator must notify the permitting authority before implementing one of the alternative work practices.
      (b)(1) An owner or operator shall comply initially with the requirements for valves in gas/vapor service and valves in light liquid service, as described in section G.5.7.
      (2) After 2 consecutive quarterly leak detection periods with the percent of valves leaking equal to or less than 2.0, an owner or operator may begin to skip 1 of the quarterly leak detection periods for the valves in gas/vapor and light liquid service.
      (3) After 5 consecutive quarterly leak detection periods with the percent of valves leaking equal to or less than 2.0, an owner or operator may begin to skip 3 of the quarterly leak detection periods for the valves in gas/vapor and light liquid service.
      (4) If the percent of valves leaking is greater than 2.0, the owner or operator shall comply with the requirements as described in section G.5.7 but can again elect to use this section.
      (5) The percent of valves leaking shall be determined as described in section G.7(h).
      (6) An owner or operator must keep a record of the percent of valves found leaking during each leak detection period.
      (7) A valve that begins operation in gas/vapor service or light liquid service after the compliance date for a process unit following one of the alternative standards in this section must be monitored in accordance with section G.5.7(a)(2)(i) or (ii) before the provisions of this section can be applied to that valve.
G.7	Equipment Leak Test Methods and Procedures
      (a) In conducting the performance tests, the owner or operator shall use as reference methods and procedures the test methods in appendix A of this part or other methods and procedures as specified in this section.
      (b) The owner or operator shall determine compliance with the standards in sections G.5.1 through G.5.11, and as follows:
      (1) USEPA Method 21 shall be used to determine the presence of leaking sources. The instrument shall be calibrated before use each day of its use by the procedures specified in USEPA Method 21 of appendix A-7 of this part. The following calibration gases shall be used:
      (i) Zero air (less than 10 ppm of hydrocarbon in air); and
      (ii) A mixture of methane or n-hexane and air at a concentration no more than 2,000 ppm greater than the leak definition concentration of the equipment monitored. If the monitoring instrument's design allows for multiple calibration scales, then the lower scale shall be calibrated with a calibration gas that is no higher than 2,000 ppm above the concentration specified as a leak, and the highest scale shall be calibrated with a calibration gas that is approximately equal to 10,000 ppm. If only one scale on an instrument will be used during monitoring, the owner or operator need not calibrate the scales that will not be used during that day's monitoring.
      (2) A calibration drift assessment shall be performed, at a minimum, at the end of each monitoring day. Check the instrument using the same calibration gas(es) that were used to calibrate the instrument before use. Follow the procedures specified in USEPA Method 21 of appendix A-7 of this part, Section 10.1, except do not adjust the meter readout to correspond to the calibration gas value. Record the instrument reading for each scale used as specified in section G.8(e)(7). Calculate the average algebraic difference between the three meter readings and the most recent calibration value. Divide this algebraic difference by the initial calibration value and multiply by 100 to express the calibration drift as a percentage. If any calibration drift assessment shows a negative drift of more than 10 percent from the initial calibration value, then all equipment monitored since the last calibration with instrument readings below the appropriate leak definition and above the leak definition multiplied by (100 minus the percent of negative drift/divided by 100) must be re-monitored. If any calibration drift assessment shows a positive drift of more than 10 percent from the initial calibration value, then, at the owner/operator's discretion, all equipment since the last calibration with instrument readings above the appropriate leak definition and below the leak definition multiplied by (100 plus the percent of positive drift/divided by 100) may be re-monitored.
      (c) The owner or operator shall determine compliance with the no-detectable-emission standards in sections G.5.2(e), G.5.3(i), G.5.4, G.5.7(f), and G.5.10(e) as follows:
      (1) The requirements of paragraph (b) shall apply.
      (2) USEPA Method 21 of appendix A-7 of this part shall be used to determine the background level. All potential leak interfaces shall be traversed as close to the interface as possible. The arithmetic difference between the maximum concentration indicated by the instrument and the background level is compared with 500 ppm for determining compliance.
      (d) The owner or operator shall test each piece of equipment unless he demonstrates that a process unit is not in VOC service, i.e., that the VOC content would never be reasonably expected to exceed 10 percent by weight. For purposes of this demonstration, the following methods and procedures shall be used:
      (1) Procedures that conform to the general methods in ASTM E260-73, 91, or 96, E168-67, 77, or 92, E169-63, 77, or 93 shall be used to determine the percent VOC content in the process fluid that is contained in or contacts a piece of equipment.
      (2) Organic compounds that are considered by the permitting authority to have negligible photochemical reactivity may be excluded from the total quantity of organic compounds in determining the VOC content of the process fluid.
      (3) Engineering judgment may be used to estimate the VOC content, if a piece of equipment had not been shown previously to be in service. If the permitting authority disagrees with the judgment, paragraphs (d)(1) and (2) of this section shall be used to resolve the disagreement.
      (e) The owner or operator shall demonstrate that a piece of equipment is in light liquid service by showing that all the following conditions apply:
      (1) The vapor pressure of one or more of the organic components is greater than 0.3 kPa at 20 °C (1.2 in. H2O at 68 °F). Standard reference texts or ASTM D2879-83, 96, or 97 shall be used to determine the vapor pressures.
      (2) The total concentration of the pure organic components having a vapor pressure greater than 0.3 kPa at 20 °C (1.2 in. H2O at 68 °F) is equal to or greater than 20 percent by weight.
      (3) The fluid is a liquid at operating conditions.
      (f) Samples used in conjunction with paragraphs (d), (e), and (g) of this section shall be representative of the process fluid that is contained in or contacts the equipment or the gas being combusted in the flare.
      (g) The owner or operator shall determine compliance with the standards of flares as follows:
      1) USEPA Method 22 of appendix A-7 of this part shall be used to determine visible emissions.
      (2) A thermocouple or any other equivalent device shall be used to monitor the presence of a pilot flame in the flare.
      (3) The maximum permitted velocity for air assisted flares shall be computed using the following equation:
                               Vmax = K1 + K2HT
Where:
      Vmax = Maximum permitted velocity, m/sec (ft/sec).
      HT = Net heating value of the gas being combusted, MJ/scm (Btu/scf).
      K1 = 8.706 m/sec (metric units) = 28.56 ft/sec (English units).
      K2 = 0.7084 m4/(MJ-sec) (metric units) = 0.087 ft4/(Btu-sec) (English units).
      (4) The net heating value (HT) of the gas being combusted in a flare shall be computed using the following equation:
      HT=Ki=1nCiHi
Where:
      K = Conversion constant, 1.740x10[−7] (g-mole)(MJ)/(ppm-scm-kcal) (metric units) = 4.674x10[−6] [(g-mole)(Btu)/(ppm-scf-kcal)] (English units).
      Ci = Concentration of sample component "i," ppm
      Hi = net heat of combustion of sample component "i" at 25°C and 760 mm Hg (77°F and 14.7 psi), kcal/g-mole.
      (5) USEPA Method 18 of appendix A-6 of this part or ASTM D6420-99 (2004) (where the target compound(s) are those listed in Section 1.1 of ASTM D6420-99, and the target concentration is between 150 parts per billion by volume and 100 ppmv) and ASTM D2504-67, 77, or 88 (Reapproved 1993) shall be used to determine the concentration of sample component "i."
      (6) ASTM D2382-76 or 88 or D4809-95 shall be used to determine the net heat of combustion of component "i" if published values are not available or cannot be calculated.
      (7) USEPA Method 2, 2A, 2C, or 2D of appendix A-7 of this part, as appropriate, shall be used to determine the actual exit velocity of a flare. If needed, the unobstructed (free) cross-sectional area of the flare tip shall be used.
      (h) The owner or operator shall determine compliance with section G.6.1 or section G.6.2 as follows:
      (1) The percent of valves leaking shall be determined using the following equation:
                             %VL = (VL / VT) * 100
Where:
      %VL = Percent leaking valves.
      VL = Number of valves found leaking.
      VT = The sum of the total number of valves monitored.
      (2) The total number of valves monitored shall include difficult-to-monitor and unsafe-to-monitor valves only during the monitoring period in which those valves are monitored.
      (3) The number of valves leaking shall include valves for which repair has been delayed.
      (4) Any new valve that is not monitored within 30 days of being placed in service shall be included in the number of valves leaking and the total number of valves monitored for the monitoring period in which the valve is placed in service.
      (5) If the process unit has been subdivided in accordance with section G.5.7(c)(1)(ii), the sum of valves found leaking during a monitoring period includes all subgroups.
      (6) The total number of valves monitored does not include a valve monitored to verify repair.
      (i) When each leak is detected as specified in sections G.5.2, G.5.3, G.5.7, G.5.8, G.5.11, and G.6.2, the following requirements apply:
      (1) A weatherproof and readily visible identification, marked with the equipment identification number, shall be attached to the leaking equipment.
      (2) The identification on a valve may be removed after it has been monitored for 2 successive months as specified in section G.5.7(c) and no leak has been detected during those 2 months.
      (3) The identification on a connector may be removed after it has been monitored as specified in section G.9.7(b)(3)(iv) and no leak has been detected during that monitoring.
      (4) The identification on equipment, except on a valve or connector, may be removed after it has been repaired.
G.8	Recordkeeping and Reporting Requirements
      (a) Recordkeeping requirements. Each owner or operator subject to the VOC equipment leak requirements specified in section G shall maintain the records specified in paragraphs (a)(1) through (10), as applicable, onsite or at the nearest local field office for at least five years.
      (1) An owner or operator of more than one facility subject to the requirements of section G may comply with the recordkeeping requirements for these facilities in one recordkeeping system if the system identifies each record by each facility.
      (2) The owner or operator shall record the information specified in paragraphs (a)(2)(i) through (v) of this section for each monitoring event required by sections G.5.2, G.5.3, G.5.7, G.5.8, G.5.11, and G.6.2.
      (i) Monitoring instrument identification.
      (ii) Operator identification.
      (iii) Equipment identification.
      (iv) Date of monitoring.
      (v) Instrument reading.
      (3) When each leak is detected as specified in sections G.5.2, G.5.3, G.5.7, G.5.8, G.5.11, and G.6.2, the following information shall be recorded in a log and shall be kept for 2 years in a readily accessible location:
      (i) The instrument and operator identification numbers and the equipment identification number, except when indications of liquids dripping from a pump are designated as a leak.
      (ii) The date the leak was detected and the dates of each attempt to repair the leak.
      (iii) Repair methods applied in each attempt to repair the leak.
      (iv) Maximum instrument reading measured by USEPA Method 21 of appendix A-7 of this part at the time the leak is successfully repaired or determined to be non-repairable, except when a pump is repaired by eliminating indications of liquids dripping.
      (v) "Repair delayed" and the reason for the delay if a leak is not repaired within 15 calendar days after discovery of the leak.
      (vi) The signature of the owner or operator (or designate) whose decision it was that repair could not be effected without a process shutdown.
      (vii) The expected date of successful repair of the leak if a leak is not repaired within 15 days.
      (viii) Dates of process unit shutdowns that occur while the equipment is unrepaired.
      (ix) The date of successful repair of the leak.
      (4) The following information pertaining to the design requirements for closed vent systems and control devices described in section G.5.10 shall be recorded and kept in a readily accessible location:
      (i) Detailed schematics, design specifications, and piping and instrumentation diagrams.
      (ii) The dates and descriptions of any changes in the design specifications.
      (iii) A description of the parameter or parameters monitored, as required in section G.5.10(e), to ensure that control devices are operated and maintained in conformance with their design and an explanation of why that parameter (or parameters) was selected for the monitoring.
      (iv) Periods when the closed vent systems and control devices required in sections G.5.2, G.5.3, G.5.4, and G.5.5 are not operated as designed, including periods when a flare pilot light does not have a flame.
      (v) Dates of startups and shutdowns of the closed vent systems and control devices required in sections G.5.2, G.5.3, G.5.4, and G.5.5.
      (5) The following information pertaining to all equipment subject to the requirements in sections G.5.1 to G.5.11 shall be recorded in a log that is kept in a readily accessible location:
      (i) A list of identification numbers for equipment subject to the requirements of this rule.
      (ii)(A) A list of identification numbers for equipment that are designated for no detectable emissions under the provisions of sections G.5.2(e), G.5.3(i), and G.5.7(f).
      (B) The designation of equipment as subject to the requirements of sections G.5.2(e), G.5.3(i), or section G.5.7(f) shall be signed by the owner or operator. Alternatively, the owner or operator may establish a mechanism with their permitting authority that satisfies this requirement.
      (C) A list of equipment identification numbers for pressure relief devices required to comply with section G.5.4.