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Electronic Code of Federal Regulations

e-CFR data is current as of May 21, 2020

Title 40Chapter ISubchapter CPart 65 → Subpart D


Title 40: Protection of Environment
PART 65—CONSOLIDATED FEDERAL AIR RULE


Subpart D—Process Vents


Contents
§65.60   Applicability.
§65.61   Definitions.
§65.62   Process vent group determination.
§65.63   Performance and group status change requirements.
§65.64   Group determination procedures.
§65.65   Monitoring.
§65.66   Recordkeeping provisions.
§65.67   Reporting provisions.
§§65.68-65.79   [Reserved]
Table 1 to Subpart D of Part 65—Concentration for Group Determination
Table 2 to Subpart D of Part 65—TRE Parameters for NSPS Referencing Subparts
Table 3 to Subpart D of Part 65—TRE Parameters for HON Referencing Subparts

§65.60   Applicability.

The provisions of this subpart and of subpart A of this part apply to regulated material emissions from process vents where a referencing subpart references the use of this subpart.

§65.61   Definitions.

All terms used in this subpart shall have the meaning given them in the Act and in subpart A of this part. If a term is defined in both subpart A of this part and in other subparts that reference the use of this subpart, the term shall have the meaning given in subpart A of this part for purposes of this subpart.

§65.62   Process vent group determination.

(a) Group status. The owner or operator of a process vent shall determine the group status (i.e., Group 1, Group 2A, or Group 2B) for each process vent. Group 1 process vents require control, and Group 2A and 2B process vents do not. Group 2A process vents require parameter monitoring, and Group 2B process vents do not. The owner or operator shall report the group status of each process vent as specified in §65.5(c)(2).

(b) Group 1. A process vent is considered Group 1 if it meets at least one of the following specifications:

(1) The owner or operator designates the process vent as Group 1.

(2) At representative operating conditions expected to yield the lowest TRE index value for the process vent, the TRE index value is less than or equal to 1.0, the flow rate is greater than or equal to 0.011 standard cubic meter per minute (0.40 standard cubic foot per minute), and the concentration is greater than or equal to the applicable criterion in table 1 of this subpart. Procedures for determining the TRE index value, flow rate, and concentration are specified in §65.64.

(c) Group 2A. A process vent is considered Group 2A if, at representative operating conditions expected to yield the lowest TRE index value, it has a TRE index value of greater than 1.0 and less than or equal to 4.0, a flow rate of greater than or equal to 0.011 standard cubic meter per minute (0.40 standard cubic foot per minute), and a concentration greater than or equal to the applicable table 1 criterion. Procedures for determining the TRE index value, flow rate, and concentration are specified in §65.64.

(d) Group 2B. A process vent is considered Group 2B if, at representative operating conditions expected to yield the lowest TRE index value, it has a TRE index value of greater than 4.0; or a flow rate of less than 0.011 standard cubic meter per minute (0.40 standard cubic foot per minute); or a concentration less than the applicable criterion in table 1 of this subpart. Procedures for determining the TRE index value, flow rate, and concentration are specified in §65.64.

§65.63   Performance and group status change requirements.

(a) Group 1 performance requirements. Except for the additional requirement for halogenated vent streams as provided in paragraph (b) of this section, the owner or operator of a Group 1 process vent shall comply with the requirements of either paragraph (a)(1), (2), or (3) of this section.

(1) Flare. Reduce emissions of regulated material using a flare meeting the applicable requirements of §65.142(b).

(2) 98 percent or 20 parts per million standard. Reduce emissions of regulated material or TOC by at least 98 weight-percent or to a concentration of less than 20 parts per million by volume, whichever is less stringent. For combustion devices, the emission reduction or concentration shall be calculated on a dry basis, and corrected to 3 percent oxygen. The owner or operator shall meet the requirements in §65.142(b) and paragraphs (a)(2)(i) and/or (a)(2)(ii) of this section.

(i) Compliance with paragraph (a)(2) of this section may be achieved by using any combination of recovery and/or control device to meet the 20 parts per million by volume concentration standard; or by using any combination of recovery and/or control device to meet the 98 weight percent reduction standard, if the recovery device meets the conditions of paragraph (a)(2)(ii) of this section.

(ii) An owner or operator may use a recovery device alone or in combination with one or more control devices to reduce emissions of total regulated material by 98 weight-percent if all of the following conditions are met:

(A) For process vents referenced to this part by 40 CFR part 63, subpart G, the recovery device (and any control device that operates in combination with the recovery device to reduce emissions of total regulated material by 98 weight-percent) was installed before December 31, 1992.

(B) The recovery device that will be used to reduce emissions of total regulated material by 98 weight-percent is the last recovery device before emission to the atmosphere.

(C) The recovery device alone or in combination with one or more control devices is capable of reducing emissions of total regulated material by 98 weight-percent but is not capable of reliably reducing emissions of total regulated material to a concentration of 20 parts per million by volume.

(D) If the owner or operator disposed of the recovered material, the recovery device would be considered a control device and comply with the requirements of this subpart and §65.142(b) for control devices.

(3) TRE index value. Achieve and maintain a TRE index value greater than 1.0 at the outlet of the final recovery device, or prior to release from the process vent to the atmosphere if no recovery device is present. If the TRE index value is greater than 1.0, the process vent shall meet the provisions for a Group 2A or 2B process vent specified in either paragraph (c), (d), (e), or (f) of this section, whichever is applicable.

(b) Halogenated Group 1 performance requirement. Halogenated Group 1 process vents that are combusted shall be controlled according to paragraph (b)(1) or (2) of this section. The owner or operator shall either designate the Group 1 process vent as a halogenated Group 1 process vent or shall determine whether the process vent is halogenated using the procedures specified in §65.64(g). If determined, the halogen concentration in the vent stream shall be recorded and reported in the Initial Compliance Status Report as specified in §65.160(d). If the owner or operator designates the process vent as a halogenated Group 1 process vent, then this shall also be recorded and reported in the Initial Compliance Status Report.

(1) Halogen reduction device following combustion. If a combustion device is used to comply with paragraph (a)(2) of this section for a halogenated process vent, then the process vent exiting the combustion device shall be ducted to a halogen reduction device including, but not limited to, a scrubber before it is discharged to the atmosphere, and the halogen reduction device shall meet the requirements of paragraph (b)(1)(i) or (ii) of this section, as applicable. The halogenated process vent shall not be combusted using a flare.

(i) Except as provided in paragraph (b)(1)(ii) of this section, the halogen reduction device shall reduce overall emissions of hydrogen halides and halogens by 99 percent or shall reduce the outlet mass of total hydrogen halides and halogens to less than 0.45 kilogram per hour (0.99 pound per hour), whichever is less stringent. The owner or operator shall meet the requirements in §65.142(b).

(ii) If a scrubber or other halogen reduction device was installed prior to December 31, 1992, the device shall reduce overall emissions of hydrogen halides and halogens by 95 percent or shall reduce the outlet mass of total hydrogen halides and halogens to less than 0.45 kilogram per hour (0.99 pound per hour), whichever is less stringent. The owner or operator shall meet the requirements in §65.142(b).

(2) Halogen reduction device prior to combustion. A halogen reduction device, such as a scrubber, or other technique may be used to reduce the process vent halogen atom mass emission rate to less than 0.45 kilogram per hour (0.99 pound per hour) prior to any combustion control device and thus make the process vent nonhalogenated; the process vent must comply with the requirements of paragraph (a)(1) or (2) of this section. The mass emission rate of halogen atoms contained in organic compounds prior to the combustor shall be determined according to the procedures in §65.64(g). The owner or operator shall maintain the record specified in §65.160(d) and submit the report specified in §65.165(d).

(c) Performance requirements for Group 2A process vents with recovery devices. For Group 2A process vents, where the owner or operator is using a recovery device to maintain a TRE index value greater than 1.0, the owner or operator shall maintain a TRE index value greater than 1.0 and comply with the requirements for recovery devices in §65.142(b).

(d) Performance requirements for Group 2A process vents without recovery devices. For Group 2A process vents where the owner or operator is not using a recovery device to maintain a TRE index value greater than 1.0, determine the appropriate parameters to be monitored and submit the information as specified in paragraphs (d)(1), (2), and (3) of this section. Such information shall be submitted for approval to the Administrator as part of a title V permit application or by separate notice. The owner or operator shall monitor as specified in §65.65(a), maintain the record specified in §65.66(e), and submit reports as specified in §65.67(c).

(1) Parameter monitoring. A description of the parameter(s) to be monitored to ensure the owner or operator of a process vent achieves and maintains the TRE above 1.0. and an explanation of the criteria used to select the parameter(s).

(2) Demonstration methods and procedures. A description of the methods and procedures that will be used to demonstrate that the parameter indicates proper operation of the process, the schedule for this demonstration, and a statement that the owner or operator will establish a range for the monitored parameter as part of the Initial Compliance Status Report required in §65.5(d), unless this information has already been included in the operating permit application.

(3) Monitoring, recordkeeping, and reporting frequency. The frequency and content of monitoring, recording, and reporting if monitoring and recordkeeping are not continuous, or if reports of daily average values when the monitored parameter value is outside the range established in the operating permit or Initial Compliance Status Report will not be included in periodic reports required under §65.5(e). The rationale for the proposed monitoring, recording, and reporting system shall be included.

(e) Group 2B performance requirements. For Group 2B process vents, the owner or operator shall maintain a TRE index greater than 4.0, a flow rate less than 0.011 scmm, or a concentration less than the applicable criteria in table 1 to this subpart.

(f) Group 2A or 2B process change requirements. Whenever process changes are made that could reasonably be expected to change a Group 2A or 2B process vent to a Group 1 vent, the owner or operator shall recalculate the TRE index value, flow, or TOC or organic hazardous air pollutant (HAP) concentration according to paragraph (f)(1), (2), or (3) of this section as specified for each process vent as necessary to determine whether the process vent is Group 1, Group 2A, or Group 2B and shall maintain the applicable records specified in §65.66(d) and submit the applicable reports specified in §65.67(b). The owner or operator shall perform the group status determination as soon as practical after the process change and within 180 days after the process change. Examples of process changes include, but are not limited to, changes in production capacity, production rate, feedstock type, or catalyst type, or whenever there is replacement, removal, or addition of recovery equipment. For purposes of paragraph (f) of this section, process changes do not include process upsets; unintentional, temporary process changes; and changes that are within the range on which the original TRE index value calculation was based.

(1) Flow rate. The flow rate shall be determined as specified in the sampling site and flow rate determination procedures in §65.64(b) and (d) or by using best engineering assessment of the effects of the change. Engineering assessments shall meet the specifications in §65.64(i).

(2) Concentration. The TOC or organic HAP concentration shall be determined as specified in §65.64(b) and (c) or by using best engineering assessment of the effects of the change. Engineering assessments shall meet the specifications in §65.64(i).

(3) TRE index value. The TRE index value shall be recalculated based on measurements of process vent flow rate, TOC, and/or organic HAP concentrations, and heating values as specified in §65.64(b), (c), (d), (e), (f), (g), and (h) as applicable, or based on best engineering assessment of the effects of the change. Engineering assessments shall meet the specifications in §65.64(i).

(4) Group status change to Group 1. Where the process change causes the group status to change to Group 1, the owner or operator shall comply with the Group 1 process vent provisions in paragraph (a) of this section and, if they apply, the halogenated Group 1 process vent provisions in paragraph (b) of this section upon initial startup after the change and thereafter unless the owner or operator demonstrates to the Administrator that achieving compliance will take longer than making the process change. If this demonstration is made to the Administrator's satisfaction, the owner or operator shall comply as expeditiously as practical, but in no event later than 3 years after the emission point becomes Group 1, and shall comply with the following procedures to establish a compliance date:

(i) The owner or operator shall submit to the Administrator for approval a compliance schedule, along with a justification for the schedule.

(ii) The compliance schedule shall be submitted with the operating permit application or amendment or by other appropriate means.

(iii) The Administrator shall approve the compliance schedule or request changes within 120 calendar days of receipt of the compliance schedule and justification.

(5) Group status change to Group 2A. Whenever a process change causes the process vent group status to change to Group 2A, the owner or operator shall comply with the provisions of paragraph (c) or (d) of this section upon completion of the group status determination of the process vent.

(6) Group status change to Group 2B. Whenever a process change causes the process vent group status to change to Group 2B, the owner or operator shall comply with the provisions of paragraph (e) of this section as soon as practical after the process change.

§65.64   Group determination procedures.

(a) General. The provisions of this section provide calculation and measurement methods for parameters that are used to determine group status.

(b)(1) Sampling site. For purposes of determining TOC or HAP concentration, process vent volumetric flow rate, heating value, or TRE index value as specified under paragraph (c), (d), (e), (f), or (h) of this section, the sampling site shall be located after the last recovery device (if any recovery devices are present) but prior to the inlet of any control device that is present, and prior to release to the atmosphere.

(2) Sampling site when a halogen reduction device is used prior to a combustion device. An owner or operator using a scrubber or other halogen reduction device to reduce the process vent halogen atom mass emission rate to less than 0.45 kilogram per hour (0.99 pound per hour) prior to a combustion control device in compliance with §65.63(b)(2) shall determine the halogen atom mass emission rate prior to the combustor and after the scrubber or other halogen reduction device according to the procedures in paragraph (g) of this section.

(3) Sampling site selection method. Method 1 or 1A of appendix A of 40 CFR part 60, as appropriate, shall be used for selection of the sampling site. No traverse site selection method is needed for process vents smaller than 0.10 meter (4 inches) in nominal inside diameter.

(c) TOC or HAP concentration. The TOC or HAP concentrations used for TRE index value calculations in paragraph (h) of this section shall be determined based on paragraph (c)(1) or (i) of this section, or any other method or data that have been validated according to the protocol in Method 301 of appendix A of 40 CFR part 63. For concentrations needed for comparison with the appropriate concentration in table 1 of this subpart, TOC or HAP concentration shall be determined based on paragraph (c)(1), (c)(2), or (i) of this section or any other method or data that have been validated according to the protocol in Method 301 of appendix A of 40 CFR part 63. The owner or operator shall record the TOC or HAP concentration as specified in §65.66(c).

(1) Method 18. The procedures specified in paragraph (c)(1)(i) and (ii) of this section shall be used to calculate parts per million by volume concentration using Method 18 of appendix A of 40 CFR part 60.

(i) The minimum sampling time for each run shall be 1 hour in which either an integrated sample or four grab samples shall be taken. If grab sampling is used, then the samples shall be taken at approximately equal intervals in time, such as 15-minute intervals during the run.

(ii) The concentration of either TOC (minus methane and ethane) or organic HAP emissions shall be calculated using the following two procedures, as applicable.

(A) The TOC concentration (CTOC) is the sum of the concentrations of the individual components and shall be computed for each run using Equation 64-1 of this section:

eCFR graphic er14de00.000.gif

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Where:

CTOC = Concentration of TOC (minus methane and ethane), dry basis, parts per million by volume.

x = Number of samples in the sample run.

n = Number of components in the sample.

Cji = Concentration of sample component j of the sample i, dry basis, parts per million by volume.

(B) The total organic HAP concentration (CHAP) shall be computed according to the equation in paragraph (c)(1)(ii)(A) of this section except that only the organic HAP species shall be summed.

(2) Method 25A. The following procedures shall be used to calculate parts per million by volume concentration using Method 25A of appendix A of 40 CFR part 60:

(i) Method 25A of appendix A of 40 CFR part 60 shall be used only if a single organic compound of regulated material is greater than 50 percent of total organic HAP or TOC, by volume, in the process vent.

(ii) The process vent composition may be determined by either process knowledge, test data collected using an appropriate EPA method, or a method or data validated according to the protocol in Method 301 of appendix A of 40 CFR part 63. Examples of information that could constitute process knowledge include calculations based on material balances, process stoichiometry, or previous test results provided the results are still relevant to the current process vent conditions.

(iii) The organic compound used as the calibration gas for Method 25A of appendix A of 40 CFR part 60 shall be the single organic compound of regulated material present at greater than 50 percent of the total organic HAP or TOC by volume.

(iv) The span value for Method 25A of appendix A of 40 CFR part 60 shall be equal to the appropriate concentration value in table 1 to this subpart.

(v) Use of Method 25A of appendix A of 40 CFR part 60 is acceptable if the response from the high-level calibration gas is at least 20 times the standard deviation of the response from the zero calibration gas when the instrument is zeroed on the most sensitive scale.

(vi) The owner or operator shall demonstrate that the concentration of TOC including methane and ethane measured by Method 25A of appendix A of 40 CFR part 60 is below one-half the appropriate value in table 1 to this subpart to be considered a Group 2B vent with an organic HAP or TOC concentration below the appropriate value in table 1 to this subpart.

(d) Volumetric flow rate. The process vent volumetric flow rate (QS) in standard cubic meters per minute at 20 °C (68 °F) shall be determined as specified in paragraphs (d)(1) and (2) of this section and shall be recorded as specified in §65.66(b):

(1) Use Method 2, 2A, 2C, or 2D of appendix A of 40 CFR part 60, as appropriate. If the process vent tested passes through a final steam jet ejector and is not condensed, the stream volumetric flow shall be corrected to 2.3 percent moisture; or

(2) The engineering assessment procedures in paragraph (i) of this section can be used for determining volumetric flow rates.

(e) Heating value. The net heating value shall be determined as specified in paragraphs (e)(1) and (2) of this section or by using the engineering assessment procedures in paragraph (i) of this section.

(1) The net heating value of the process vent shall be calculated using Equation 64-2 of this section:

eCFR graphic er14de00.001.gif

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Where:

HT = Net heating value of the sample, megajoule per standard cubic meter, where the net enthalpy per mole of process vent is based on combustion at 25 °C and 760 millimeters of mercury, but the standard temperature for determining the volume corresponding to 1 mole is 20 °C as in the definition of QS (process vent volumetric flow rate).

K1 = Constant, 1.740 × 10−7 (parts per million)−1 (gram-mole per standard cubic meter) (megajoule per kilocalorie), where standard temperature for (gram-mole per standard cubic meter) is 20 °C.

n = Number of components in the sample.

Dj = Concentration on a wet basis of compound j in parts per million as measured by procedures indicated in paragraph (e)(2) of this section. For process vents that pass through a final steam jet and are not condensed, the moisture is assumed to be 2.3 percent by volume.

Hj = Net heat of combustion of compound j, kilocalorie per gram-mole, based on combustion at 25 °C and 760 millimeters of mercury. The heat of combustion of process vent components shall be determined using American Society for Testing and Materials (ASTM) D2382-76 (incorporated by reference as specified in §65.13) if published values are not available or cannot be calculated.

(2) The molar composition of the process vent (Dj) shall be determined using the following methods:

(i) Method 18 of appendix A of 40 CFR part 60 to measure the concentration of each organic compound.

(ii) American Society for Testing and Materials (ASTM) D1946-77 (incorporated by reference as specified in §65.13) to measure the concentration of carbon monoxide and hydrogen.

(iii) Method 4 of appendix A of 40 CFR part 60 to measure the moisture content of the stack gas.

(f) TOC or HAP emission rate. The emission rate of TOC (minus methane and ethane) (ETOC) and/or the emission rate of total organic HAP (EHAP) in the process vent as required by the TRE index value equation specified in paragraph (h) of this section, shall be calculated using Equation 64.3 of this section:

eCFR graphic er14de00.002.gif

View or download PDF

Where:

E = Emission rate of TOC (minus methane and ethane) (ETOC) or emission rate of total organic HAP (EHAP) in the sample, kilograms per hour.

K2 = Constant, 2.494 × 10−6 (parts per million) (gram-mole per standard cubic meter) (kilogram per gram) (minutes per hour), where standard temperature for (gram-mole per standard cubic meter) is 20 °C.

n = Number of components in the sample.

Cj = Concentration on a dry basis of organic compound j in parts per million as measured by Method 18 of appendix A of 40 CFR part 60 as indicated in paragraph (c) of this section. If the TOC emission rate is being calculated, Cj includes all organic compounds measured minus methane and ethane; if the total organic HAP emission rate is being calculated, only organic HAP compounds are included.

Mj = Molecular weight of organic compound j, gram/gram-mole.

Qs = Process vent flow rate, dry standard cubic meter per minute, at a temperature of 20 °C.

(g) Halogenated vent determination. In order to determine whether a process vent is halogenated, the mass emission rate of halogen atoms contained in organic compounds shall be calculated according to the procedures specified in paragraphs (g)(1) and (2) of this section. A process vent is considered halogenated if the mass emission rate of halogen atoms contained in the organic compounds is equal to or greater than 0.45 kilogram per hour (0.99 pound per hour).

(1) The process vent concentration of each organic compound containing halogen atoms (parts per million by volume, by compound) shall be determined based on one of the following procedures:

(i) Process knowledge that no halogen or hydrogen halides are present in the process vent; or

(ii) Applicable engineering assessment as discussed in paragraph (i)(3) of this section; or

(iii) Concentration of organic compounds containing halogens measured by Method 18 of appendix A of 40 CFR part 60; or

(iv) Any other method or data that have been validated according to the applicable procedures in Method 301 of appendix A of 40 CFR part 63.

(2) Equation 64-4 of this section shall be used to calculate the mass emission rate of halogen atoms:

eCFR graphic er14de00.003.gif

View or download PDF

Where:

E = Mass of halogen atoms, dry basis, kilogram per hour.

K2 = Constant, 2.494 × 10− 6 (parts per million)−1 (kilogram-mole per standard cubic meter) (minute per hour), where standard temperature is 20 °C.

Q = Flow rate of gas stream, dry standard cubic meters per minute, determined according to paragraph (d) or (i) of this section.

n = Number of halogenated compounds j in the gas stream.

j = Halogenated compound j in the gas stream.

m = Number of different halogens i in each compound j of the gas stream.

i = Halogen atom i in compound j of the gas stream.

Cj = Concentration of halogenated compound j in the gas stream, dry basis, parts per million by volume.

Lji = Number of atoms of halogen i in compound j of the gas stream.

Mji = Molecular weight of halogen atom i in compound j of the gas stream, kilogram per kilogram-mole.

(h) TRE index value. The owner or operator shall calculate the TRE index value of the process vent using the equations and procedures specified in paragraphs (h)(1) through (3) of this section, as applicable, and shall maintain the records specified in §65.66(a) or §65.66(d)(4), as applicable.

(1) TRE index value equation. Equation 64-5 of this section shall be used to calculate the TRE index:

eCFR graphic er14de00.022.gif

View or download PDF

Where:

TRE = TRE index value.

A, B, C, D, E, and F = Parameters presented in tables 2 and 3 of this subpart that include the following variables:

Q = Process vent flow rate, standard cubic meters per minute, at a standard temperature of 20 °C, as calculated according to paragraph (d) or (i) of this section.

H = Process vent net heating value, megajoules per standard cubic meter, as calculated according to paragraph (e) or (i) of this section.

ETOC = Emission rate of TOC (minus methane and ethane), kilograms per hour, as calculated according to paragraph (f) or (i) of this section.

EHAP = Emission rate of total organic HAP, kilograms per hour, as calculated according to paragraph (f) or (i) of this section.

(2) Nonhalogenated process vents. The owner or operator of a nonhalogenated process vent shall calculate the TRE index value using either one of the following procedures, as applicable:

(i) TRE calculations: Part 60 regulated sources. Use the parameters in table 2 to this subpart and calculate the TRE index value twice, once using the appropriate equation (depending on the heating value and flow rate of the process vent) in equations 15 through 30 and once using the appropriate equation (depending on the heating value of the process vent) in equations 31 and 32. Select the lowest TRE index value.

(ii) TRE calculations: Part 63 regulated sources. Use the equation and parameters in table 3 to this subpart and calculate the TRE index value using equations 34, 35, and 36 for process vents at existing sources; or equations 38, 39, and 40 for process vents at new sources. Select the lowest TRE index value.

(3) Halogenated process vents. The owner or operator of a halogenated process vent stream as determined according to procedures specified in paragraph (g) of this section shall calculate the TRE index value using either one of the following procedures, as applicable:

(i) TRE Calculations: Part 60 regulated sources. Use the parameters in table 2 to this subpart and calculate the TRE index value using the appropriate equation chosen from equations 1 through 14 depending on the heating value and flow rate of the process vent.

(ii) TRE calculations: Part 63 regulated sources. Use the appropriate parameters in table 3 to this subpart and calculate the TRE index value using equation 33 or 37 depending on whether the process vent is at a new or existing source.

(i) Engineering assessment. For purposes of TRE index value determination, engineering assessment may be used to determine process vent flow rate, net heating value, TOC emission rate, and total organic HAP emission rate for the representative operating condition expected to yield the lowest TRE index value. Engineering assessments shall meet the requirements of paragraphs (i)(1) through (4) of this section. If process vent flow rate or process vent organic HAP or TOC concentration is being determined for comparison with the 0.011 scmm (0.40 standard cubic foot) flow rate or the applicable concentration value in table 1 to this subpart, engineering assessment may be used to determine the flow rate or concentration for the representative operating condition expected to yield the highest flow rate or concentration.

(1) If the TRE index value calculated using such engineering assessment and the TRE index value equation in paragraph (h) of this section is greater than 4.0, then the owner or operator is not required to perform the measurements specified in paragraphs (c) through (g) of this section.

(2) If the TRE index value calculated using such engineering assessment and the TRE index value equation in paragraph (h) of this section is less than or equal to 4.0, then the owner or operator is required either to perform the measurements specified in paragraphs (c) through (g) of this section for group determination or to consider the process vent a Group 1 process vent and comply with the requirement (or standard) specified in §65.63(a) and, if applicable, §65.63(b).

(3) Engineering assessment includes, but is not limited to, the examples specified in paragraphs (i)(3)(i) through (iv) of this section.

(i) Previous test results provided the tests are representative of current operating practices at the process unit.

(ii) Bench-scale or pilot-scale test data representative of the process under representative operating conditions.

(iii) Maximum flow rate, TOC emission rate, organic HAP emission rate, organic HAP or TOC concentration, or net heating value limit specified or implied within a permit limit applicable to the process vent.

(iv) Design analysis based on accepted chemical engineering principles, measurable process parameters, or physical or chemical laws or properties. Examples of analytical methods include, but are not limited to, the following examples:

(A) Use of material balances based on process stoichiometry to estimate maximum TOC or organic HAP concentrations;

(B) Estimation of maximum flow rate based on physical equipment design such as pump or blower capacities;

(C) Estimation of TOC or organic HAP concentrations based on saturation conditions; and

(D) Estimation of maximum expected net heating value based on the stream concentration of each organic compound or, alternatively, as if all TOC in the stream were the compound with the highest heating value.

(4) All data, assumptions, and procedures used in the engineering assessment shall be documented. The owner or operator shall maintain the records specified in §65.66(a), (b), (c), or (d), as applicable.

§65.65   Monitoring.

(a) An owner or operator of a Group 2A process vent maintaining a TRE index value greater than 1.0 without a recovery device shall monitor based on the approved plan as specified in §65.63(d).

(b) As required in §65.63(a) and (c), an owner or operator of a Group 2A process vent maintaining a TRE index value greater than 1.0 with a recovery device or a Group 1 process vent shall comply with §65.142(b).

§65.66   Recordkeeping provisions.

(a) TRE index value records. The owner or operator shall maintain records of measurements, engineering assessments, and calculations performed to determine the TRE index value of the process vent according to the procedures of §65.64(h), including those records associated with halogen vent stream determination. Documentation of engineering assessments shall include all data, assumptions, and procedures used for the engineering assessments, as specified in §65.64(i). As specified in §65.67(a), the owner or operator shall include this information in the Initial Compliance Status Report.

(b) Flow rate records. Each owner or operator who elects to demonstrate that a process vent is Group 2B based on a flow rate less than 0.011 standard cubic meter per minute (0.40 standard cubic foot per minute) shall record the flow rate as measured using the sampling site and flow rate determination procedures specified in §65.64(b) and (d) or determined through engineering assessment as specified in §65.64(i). As specified in §65.67(a), the owner or operator shall include this information in the Initial Compliance Status Report.

(c) Concentration records. Each owner or operator who elects to demonstrate that a process vent is Group 2B based on a concentration less than the applicable criteria in table 1 to this subpart shall record the organic HAP or TOC concentration as measurement using the sampling site and HAP or TOC concentration determination procedures specified in §65.64(b) and (c) or determined through engineering assessment as specified in §65.64(i). As specified in §65.67(a), the owner or operator shall include this information in the Initial Compliance Status Report.

(d) Process change records. The owner or operator shall keep up-to-date, readily accessible records as specified in the following and shall report this information as specified in §65.67(b):

(1) If the process vent is Group 2B on the basis of flow rate being less than 0.011 scmm (0.40 standard cubic foot), then the owner or operator shall keep records of any process changes as defined in §65.63(f) that increase the process vent flow rate and any recalculation or measurement of the flow rate pursuant to §65.63(f).

(2) If the process vent is Group 2B on the basis of organic HAP or TOC concentration being less than the applicable value in table 1 to this subpart, then the owner or operator shall keep records of any process changes as defined in §65.63(f) that increase the organic HAP or TOC concentration of the process vent and any recalculation or measurement of the concentration pursuant to §65.63(f).

(3) If the process vent is Group 2A or Group 2B on the basis of the TRE index value being greater than 1.0, then the owner or operator shall keep records of any process changes as defined in §65.63(f) and any recalculation of the TRE index value pursuant to §65.63(f).

(4) As a result of a process change, if a process vent that was Group 2B on any basis becomes a Group 2B process vent only on the basis of having a TRE greater than 4.0, then the owner or operator shall keep records of the TRE index value determination performed according to the sample site and TRE index value determination procedures of §65.64(b)(1) and (h) or determined through engineering assessment as specified in §65.64(i).

(e) Other Group 2A records. An owner or operator of a Group 2A process vent maintaining a TRE index value greater than 1.0 without a recovery device shall record the parameters monitored based on the approved plan as specified in §65.63(d).

§65.67   Reporting provisions.

(a) Initial compliance status report. The owner or operator shall submit as part of the Initial Compliance Status Report specified in §65.5(d) the information recorded in §65.66(a), (b), and (c), as applicable.

(b) Process change. (1) Whenever a process change, as described in §65.63(f), is made that causes a Group 2A or 2B process vent to become a Group 1 process vent or a Group 2B process vent to become a Group 2A process vent, the owner or operator shall either submit a report within 60 days after the performance test or group determination or submit a report included as part of the next periodic report. The report shall include the following information:

(i) A description of the process change;

(ii) The results of the recalculation of the flow rate, organic HAP or TOC concentration, and/or TRE index value required under §65.63(f) and recorded under §65.66(d); and

(iii) A statement that the owner or operator will comply with the provisions of §65.63 by the schedules specified in §65.63(f)(4) through (6).

(2) For process vents that become Group 1 process vents after a process change requiring a performance test to be conducted for the control device being used as specified in subpart G of this part, the owner or operator shall specify that the performance test has become necessary due to a process change. This specification shall be made in the notification to the Administrator of the intent to conduct a performance test as provided in §65.164(b)(1).

(3) Whenever a process change as described in §65.63(f) is made that changes the group status of a process vent from Group 1 to Group 2A, or from Group 1 to Group 2B, or from Group 2A to Group 2B, the owner or operator shall include a statement in the next periodic report after the process change that a process change has been made and the new group status of the process vents.

(4) The owner or operator is not required to submit a report of a process change if one of the following conditions is met:

(i) The change does not meet the definition of a process change in §65.63(f); or

(ii) For a Group 2B process vent, the vent stream flow rate is recalculated according to §65.63(f) and the recalculated value is less than 0.011 standard cubic meter per minute (0.40 standard cubic foot per minute); or

(iii) For a Group 2B process vent, the organic HAP or TOC concentration of the vent stream is recalculated according to §65.63(f), and the recalculated value is less than the applicable value in table 1 to this subpart; or

(iv) For a Group 2B process vent, the TRE index value is recalculated according to §65.63(f) and the recalculated value is greater than 4.0.

(c) Parameters for Group 2A without a recovery device. An owner or operator of a Group 2A process vent maintaining a TRE index value greater than 1.0 without using a recovery device shall report the information specified in the approved plan under §65.63(d).

§§65.68-65.79   [Reserved]

Table 1 to Subpart D of Part 65—Concentration for Group Determination

Referencing subpart Concentration1
Subpart III of Part 60NA.
Subpart NNN of Part 60300 ppmv of TOC.
Subpart RRR of Part 60300 ppmv of TOC.
Subpart G of Part 6350 ppmv of HAP2.

1The 50 ppm HAP concentration cutoff only applies to 40 CFR part 63, subpart G sources. Process vents subject to only 40 CFR part 60, subparts RRR or NNN are eligible for the 300 ppm TOC cutoff. There is no concentration cutoff for subpart III sources. The process vent provisions of subpart DDD are not consolidated under this subpart.

2For process vents subject to subpart G of 40 CFR part 63, the owner or operator may measure HAP or TOC concentration with regard to the low concentration exemption provisions of this part.

Table 2 to Subpart D of Part 65—TRE Parameters for NSPS Referencing Subpartsa

Halogenated vent stream?Net heating value
(MJ/scm)b
Vent stream flow rate (scm/min)c Values of terms for TRE equation: TRE = A * [ B + C + D + E + F ] Equation number
A B C D E F
Yes0≤H ≤3.5Q <14.21/ETOC30.9633400−0.13064QH01
   14.2≤Q ≤18.81/ETOC19.183700.27580Q0.757620Q0.88−0.13064QH0.01025Q0.52
   18.8<Q ≤6991/ETOC20.005630.27580Q0.303870Q0.88−0.13064QH0.01025Q0.53
   699<Q ≤14001/ETOC39.870220.29973Q0.303870Q0.88−0.13064QH0.01449Q0.54
   1400<Q ≤21001/ETOC59.734810.31467Q0.303870Q0.88−0.13064QH0.01775Q0.55
   2100<Q ≤28001/ETOC79.599410.32572Q0.303870Q0.88−0.13064QH0.02049Q0.56
   2800<Q ≤35001/ETOC99.464000.33456Q0.303870Q0.88−0.13064QH0.02291Q0.57
   H >3.5Q <14.21/ETOC20.6105200008
   14.2≤Q ≤18.81/ETOC18.844660.26742Q−0.200440Q0.8800.01025Q0.59
   18.8<Q ≤6991/ETOC19.666580.26742Q−0.253320Q0.8800.01025Q0.510
   699<Q ≤14001/ETOC39.192130.29062Q−0.253320Q0.8800.01449Q0.511
   1400<Q ≤21001/ETOC58.717680.30511Q−0.253320Q0.8800.01775Q0.512
   2100<Q ≤28001/ETOC78.243230.31582Q−0.253320Q0.8800.02049Q0.513
   2800<Q ≤35001/ETOC97.768790.32439Q−0.253320Q0.8800.02291Q0.514
No0≤H ≤0.48Q <14.21/ETOC11.0125000−0.17109QH015
   14.2≤Q ≤13401/ETOC8.542450.10555Q0.090300Q0.88−0.17109QH0.01025Q0.516
   1340<Q ≤26901/ETOC16.943860.11470Q0.090300Q0.88−0.17109QH0.01449Q0.517
   2690<Q ≤40401/ETOC25.345280.12042Q0.090300Q0.88−0.17109QH0.01775Q0.518
   0.48<H ≤1.9Q <14.21/ETOC13.4563000−0.16181QH019
   14.2≤Q ≤13401/ETOC9.252330.06105Q0.319370Q0.88−0.16181QH10.01025Q0.520
   1340<Q ≤26901/ETOC18.363630.06635Q0.319370Q0.88−0.16181QH0.01449Q0.521
   2690<Q ≤40401/ETOC27.474920.06965Q0.319370Q0.88−0.16181QH0.01775Q0.522
   1.9<H ≤3.6Q <14.21/ETOC7.96988000023
   14.2≤Q ≤11801/ETOC6.678680.06943Q0.025820Q0.8800.01025Q0.524
   1180<Q ≤23701/ETOC13.216330.07546Q0.025820Q0.8800.01449Q0.525
   2370<Q ≤35501/ETOC19.753980.07922Q0.025820Q0.8800.01775Q0.526
   H >3.6Q <14.21/ETOC6.6786800.02220Q0.88H0.88−0.00707QH0.02036H0.527
   Q ≥14.2 and
14.2≤Q*(H/3.6) ≤1180
1/ETOC6.6786800.02220Q0.88H0.88−0.00707QH0.00540Q0.5H0.528
   Q ≥14.2 and
1180<Q*(H/3.6) ≤2370
1/ETOC13.2163300.02412Q0.88H0.88−0.00707QH0.00764Q0.5H0.529
   Q ≥14.2 and
2370<Q*(H/3.6) ≤3550
1/ETOC19.7539800.02533Q0.88H0.88−0.00707QH0.00936Q0.5H0.530
No0≤H <11.2All1/ETOC2.082.25Q0.288Q0.8−0.193QH−0.0051ETOC31
   H ≥11.2All1/ETOC2.080.309Q0.0619Q0.8−0.0043QH−0.0043ETOC32

aUse according to procedures outlined in §65.64(h).

bMJ/scm = mega Joules per standard cubic meter.

cscm/min = standard cubic meters per minute.

Table 3 to Subpart D of Part 65—TRE Parameters for HON Referencing Subpartsa

Existing or new? Halogenated vent stream? Values of terms for TRE equation: TRE = A * [ B + C + D + E + F ]
A B C D E F Equation number
ExistingYes1/EHAP3.9950.05200Q0−0.001769H0.0009700ETOC33
   No1/EHAP1.9350.3660Q0−0.007687H−0.000733ETOC34
   1/EHAP1.4920.06267Q00.03177H−0.001159ETOC35
   1/EHAP2.5190.01183Q00.01300H0.04790ETOC36
NewYes1/EHAP1.08950.01417Q0−0.000482H0.0002645ETOC37
   No1/EHAP0.52760.0998Q0−0.002096H−0.0002000ETOC38
   1/EHAP0.40680.0171Q00.008664H−0.000316ETOC39
   1/EHAP0.68680.00321Q00.003546H0.01306ETOC40

aUse according to procedures outlined in §65.64(h).

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