40 CFR Ch. I (7–1–11 Edition) § 63.1103

§ 63.1103 40 CFR Ch. I (7–1–11 Edition)

(b) [Reserved].

TABLE 1 TO § 63.1102—SOURCE CATEGORY PROPOSAL AND EFFECTIVE DATES

Source category Proposal date Effective date

(a) Acetal Resins Production ...... October 14, 1998 ...... June 29, 1999. (b) Acrylic and Modacrylic Fibers Production ...... October 14, 1998 ...... June 29, 1999. (c) Hydrogen Fluoride Production ...... October 14, 1998 ...... June 29, 1999. (d) Polycarbonate Production ...... October 14, 1998 ...... June 29, 1999. (e) Ethylene Production ...... December 6, 2000 ...... July 12, 2002. (f) Carbon Black Production ...... December 6, 2000 ...... July 12, 2002. (g) Cyanide Chemicals Manufacturing ...... December 6, 2000 ...... July 12, 2002. (h) Spandex Production ...... December 6, 2000 ...... July 12, 2002.

[67 FR 46280, July 12, 2002]

§ 63.1103 Source category-specific ap- aldehyde resins. Acetal resins are gen- plicability, definitions, and require- erally produced by polymerizing form- ments. aldehyde (HCHO) with the methylene (a) Acetal resins production applica- functional group (CH2) and are charac- bility, definitions, and requirements—(1) terized by repeating oxymethylene Applicability—(i) Affected source. For units (CH2O) in the polymer backbone. the acetal resins production source cat- Back end process vent means any proc- egory (as defined in paragraph (a)(2) of ess vent from a continuous unit oper- this section), the affected source shall ation that is not a front end process comprise all emission points, in com- vent up to the final separation of raw bination, listed in paragraphs materials and by-products from the (a)(1)(i)(A) through (D) of this section, stabilized polymer. that are associated with an acetal res- Front end process vent means any ins production process unit located at a process vent from a continuous unit major source, as defined in section operation involved in the purification 112(a) of the Clean Air Act (Act). of formaldehyde feedstock for use in (A) All storage vessels that store liq- the acetal homopolymer process. All uids containing organic HAP. For pur- front end process vents are restricted poses of regulation, surge control ves- to those vents that occur prior to the sels and bottoms receivers that are lo- polymer reactor. cated as part of the process train prior (3) Requirements. Table 1 of this sec- to the polymer reactor are to be regu- tion specifies the acetal resins produc- lated under the front-end process vent tion standards applicability for exist- provisions. (B) All process vents from continuous ing and new sources. Applicability as- unit operations (front end process sessment procedures and methods are vents and back end process vents). specified in §§ 63.1104 through 63.1107. (C) All wastewater streams associ- An owner or operator of an affected ated with the acetal resins production source is not required to perform tests, process unit as defined in (a)(2) of this TRE calculations or other applicability section. assessment procedures if they opt to (D) Equipment (as defined in § 63.1101 comply with the most stringent re- of this subpart) that contains or con- quirements for an applicable emission tacts organic HAP. point pursuant to this subpart. General (ii) Compliance schedule. The compli- compliance, recordkeeping, and report- ance schedule for affected sources as ing requirements are specified in defined in paragraph (a)(1)(i) of this §§ 63.1108 through 63.1112. Procedures for section is specified in § 63.1102(a). approval of alternative means of emis- (2) Definitions. sion limitations are specified in Acetal resins production means the § 63.1113. The owner or operator must production of homopolymers and/or co- control organic HAP emissions from polymers of alternating oxymethylene each affected source emission point by units. Acetal resins are also known as meeting the applicable requirements polyoxymethylenes, polyacetals, and specified in table 1 of this section.

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TABLE 1 TO § 63.1103(A)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE AN ACETAL RESINS PRODUCTION EXISTING OR NEW AFFECTED SOURCE?

If you own or operate. . . And if. . . Then you must. . .

1. A storage vessel with: 34 cubic meters The maximum true vapor pressure of or- a. Reduce emissions of total organic < capacity. ganic HAP > 17.1 kilopascals (for ex- HAP by 95 weight-percent by venting isting sources) or > 11.7 kilopascals emissions through a closed vent sys- (for new sources). tem to any combination of control devices meeting the requirements of subpart SS (national emission standards for closed vent systems, control devices, recovery devices, and routing to a fuel gas system or a process), as specified in § 63.982(a)(1) (storage vessel requirements) of this part; or b. Comply with the requirements of subpart WW (national emission standards for storage vessels (control level 2)) of this part. 2. A front end process vent from contin- ...... a. Reduce emissions of total organic uous unit operations. HAP by using a flare meeting the requirements of subpart SS of this part; or b. Reduce emissions of total organic HAP by 60 weight-percent, or reduce TOC to a concentration of 20 parts per million by volume, whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(2) (process vent requirements) of this part. 3. A back end process vent from contin- The vent stream has a TRE a < 1.0...... a. Reduce emissions of total organic uous unit operations. HAP by using a flare meeting the requirements of subpart SS of this part; or b. Reduce emissions of total organic HAP by 98 weight-percent, or reduce TOC to a concentration of 20 parts per million by volume, whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(2) (process vent requirements) of this part; or c. Achieve and maintain a TRE index value greater than 1.0. 4. A back end process vent from contin- 1.0 ≤ TRE a ≤ 4.0 ...... Monitor and keep records of equipment uous unit operations. operating parameters specified to be monitored under subpart SS, §§ 63.990(c)(absorber, condenser, and carbon adsorber monitoring) or 63.995(c) (other noncombustion systems used as a control device monitoring) of this part. 5. Equipment as defined under § 63.1101 The equipment contains or contacts ≥ 10 Comply with the requirements of subpart weight-percent organic HAP b, and op- TT (national emission standards for erates ≤ 300 hours per year. equipment leaks (control level 1)) or subpart UU (national emission standards for equipment leaks (control level 2)) of this part. 6. An acetal resins production process The process wastewater stream is a Comply with the requirements of unit that generates process wastewater. Group 1 or Group 2 wastewater § 63.1106(a). stream. 7. An acetal resins production process The maintenance wastewater contains Comply with the requirements of unit that generates maintenance waste- organic HAP. § 63.1106(b). water. 8. An item of equipment listed in The item of equipment meets the criteria Comply with the requirements in Table § 63.1106(c)(1). specified in § 63.1106(c)(1) through (3) 35 of subpart G of this part. and either (c)(4)(i) or (ii). a The TRE is determined according to the procedures specified in § 63.1104(j). b The weight-percent organic HAP is determined for equipment according to procedures specified in § 63.1107.

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(b) Acrylic and modacrylic fiber produc- cally polyacrylonitrile). The tion applicability, definitions, and re- polyacrylonitrile is soluble in the sol- quirements—(1) Applicability—(i) Affected vent. In contrast to suspension polym- source. For the acrylic fibers and erization, the resulting reactor poly- modacrylic fibers production (as de- mer solution (spin dope) is filtered and fined in paragraph (b)(2) of this sec- pumped directly to the fiber spinning tion) source category, the affected process. source shall comprise all emission Acrylonitrile suspension polymerization points, in combination, listed in para- means a polymerization process where graphs (b)(1)(i)(A) through (E) of this small drops of acrylonitrile and co- section, that are associated with a sus- monomers are suspended in water in pension or solution polymerization the presence of a catalyst where they process unit that produces acrylic and polymerize under agitation. Solid modacrylic fiber located at a major beads of polymer are formed in this source as defined in section 112(a) of suspension reaction which are subse- the Act. quently filtered, washed, refiltered, and (A) All storage vessels that store liq- dried. The beads must be subsequently uid containing acrylonitrile or organic redissolved in a solvent to create a spin HAP. dope prior to introduction to the fiber (B) All process vents from continuous spinning process. unit operations. Fiber spinning line means the group of (C) All wastewater streams associ- equipment and process vents associated ated with the acrylic and modacrylic with acrylic or modacrylic fiber spin- fibers production process unit as de- ning operations. The fiber spinning line fined in (b)(2) of this section. includes (as applicable to the type of (D) Equipment (as defined in § 63.1101 spinning process used) the blending and of this subpart) that contains or con- dissolving tanks, spinning solution fil- tacts acrylonitrile or organic HAP. ters, wet spinning units, spin bath (E) All acrylic and modacrylic fiber tanks, and the equipment used down- spinning lines using a spinning solu- stream of the spin bath to wash, dry, or tion or suspension having organic acry- draw the spun fiber. lonitrile or organic HAP. For the pur- Modacrylic fiber means a manufac- poses of implementing this paragraph, tured synthetic fiber in which the a spinning line includes the spinning fiber-forming substance is any long- solution filters, spin bath, and the chain synthetic polymer composed of equipment used downstream of the spin at least 35 percent by weight of acrylo- bath to wash, dry, or draw the spun nitrile units but less than 85 percent by fiber. weight of acrylonitrile units. (ii) Compliance schedule. The compli- Spin dope means the liquid mixture of ance schedule, for affected sources as polymer and solvent that is fed to the defined in paragraph (b)(1)(i) of this spinneret to form the acrylic and section, is specified in § 63.1102(a). modacrylic fibers. (2) Definitions. (3) Requirements. An owner or oper- Acrylic fiber means a manufactured ator of an affected source must comply synthetic fiber in which the fiber-form- with the requirements of paragraph ing substance is any long-chain syn- (b)(3)(i) or (ii) of this section. thetic polymer composed of at least 85 (i) Table 2 of this section specifies percent by weight of acrylonitrile the acrylic and modacrylic fiber pro- units. duction source category control re- Acrylic and modacrylic fibers produc- quirement applicability for both exist- tion means the production of either of ing and new sources. Applicability as- the following synthetic fibers com- sessment procedures and methods are posed of acrylonitrile units: specified in §§ 63.1104 through 63.1107. (i) Acrylic fiber. An owner or operator of an affected (ii) Modacrylic fiber. source is not required to perform tests, Acrylonitrile solution polymerization or other applicability assessment pro- means a process where acrylonitrile cedures if they opt to comply with the and comonomers are dissolved in a sol- most stringent requirements for an ap- vent to form a polymer solution (typi- plicable emission point pursuant to

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this subpart. General compliance, rec- owner or operator must control organic ordkeeping, and reporting require- HAP emissions from each affected ments are specified in §§ 63.1108 through source emission point by meeting the 63.1112. Procedures for approval of al- applicable requirements specified in ternative means of emission limita- table 2 of this section. tions are specified in § 63.1113. The

TABLE 2 TO § 63.1103(b)(3)(i)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE AN ACRYLIC AND MODACRYLIC FIBER PRODUCTION EXISTING OR NEW AFFECTED SOURCE AND AM COMPLYING WITH PARAGRAPH (b)(3)(i) OF THIS SECTION?

If you own or operate... And if... Then you must...

1. A storage vessel ...... The stored material is acrylonitrile ...... a. Reduce emissions of acrylonitrile by 98 weight-percent by venting emissions through a closed vent system to any combination of control device meeting the requirements of subpart SS (national emission standards for closed vent systems, control devices, recovery devices, and routing to a fuel gas system or a process), as specified in § 63.982(a)(1) (storage vessel requirements) of this part, or 95 weight- percent or greater by venting through a closed vent system to a recovery device meeting the requirements of subpart SS (national emission standards for closed vent systems, control devices, recovery devices, and routing to a fuel gas system or a process), § 63.993 (recovery device requirements) of this part; or b. Comply with the requirements of subpart WW (national emission standards for storage vessels (control level 2)) of this part. 2. A process vent from continuous unit The vent steam has a mass emission a. Reduce emissions of acrylonitrile or operations (halogenated). rate of halogen atoms contained in or- TOC as specified for nonhalogenated ganic compounds ≥0.45 kilograms per process vents from continuous unit hour a and an acrylonitrile concentra- operations (other than by using a tion ≥50 parts per million by volume b flare) by venting emissions through a and an average flow rate ≥0.005 cubic closed vent system to a halogen re- meters per minute. duction device meeting the requirements of subpart SS, § 63.994 (halogen reduction devices requirements) of this part that reduces hydrogen halides and halogens by 99 weight- percent or to less than 0.45 kilograms per year, whichever is less stringent; or b. Reduce the process vent halogen atom mass emission rate to less than 0.45 kilograms per hour by venting emissions through a closed vent system to a halogen reduction device meeting the requirements of subpart SS, § 63.994 (halogen reduction devices requirements) of this part and then complying with the requirements specified for process vents from continuous unit operations (nonhalogenated).

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If you own or operate... And if... Then you must...

3. A process vent from continuous unit The vent steam has a mass emission a. Reduce emissions of acrylonitrile by operations (nonhalogenated). rate of halogen atoms contained in or- using a flare meeting the requirements ganic compounds <0.45 kilograms per of subpart SS, § 63.987 (flare require- hour a, and an acrylonitrile concentra- ments) of this part or tion ≥50 parts per million by volume b b. Reduce emissions of acrylonitrile by and an average flow rate ≥0.005 cubic 98 weight-percent, or reduce TOC to a meters per minute. concentration of 20 parts per million by volume, whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS (national emission standards for closed vent systems, control devices, recovery devices, and routing to a fuel gas system or a process), as specified in § 63.982(a)(2) (process vent requirements) of this part. 4. A fiber spinning line that is a new or re- The lines use a spin dope produced a. Reduce acrylonitrile emissions by 85 constructed source. from either a suspension polymeriza- weight-percent or more. (For example, tion process or solution polymerization by enclosing the spinning and washing process,. areas of the spinning line (as specified in paragraph (b)(4) of this section) and venting through a closed vent system and using any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a), of this part); or b. Reduce acrylonitrile emissions from the spinning line to less than or equal to 0.25 kilograms of acrylonitrile per megagram (0.5 pounds of acrylonitrile per ton) of acrylic and modacrylic fiber produced; or c. Reduce the AN concentration of the spin dope to less than 100 ppmw. 5. A fiber spinning line that is an existing The spinning line uses a spin dope pro- Maintain records and report emissions source. duced from a solution polymerization as specified in §§ 63.1109 through process. 63.1110. Control of spinning line AN emissions is not required 6. A fiber spinning line that is an existing The spinning line uses a spin dope pro- a. Reduce the AN concentration of the source. duced from a suspension polymeriza- spin dope to less than 100 ppmw b, or tion process. b. Reduce acrylonitrile emissions from the spinning line to less than or equal to 0.025 kilograms of acrylonitrile per megagram of acrylic and modacrylic fiber produced. 7. Equipment as defined under § 63.1101 It contains or contacts ≥10 weight-per- Comply with the requirements of subpart cent acrylonitrile c, and operates ≥300 TT (national emission standards for hours per year. equipment leaks (control level 1)) or subpart UU (national emission standards for equipment leaks (control level 2)) of this part. 8. An acrylic and modacrylic fiber produc- The process wastewater stream is a Comply with the requirements of tion process unit that generates process Group 1 or Group 2 wastewater § 63.1106(a). wastewater. stream. 9. An acrylic and modacrylic fiber produc- The maintenance wastewater contains Comply with the requirements of tion process unit that generates mainte- organic HAP. § 63.1106(b). nance wastewater. 10. An item of equipment listed in The item of equipment meets the criteria Comply with the requirements in Table § 63.1106(c)(1). specified in § 63.1106(c)(1) through (3) 35 of subpart G of this part. and either (c)(4)(i) or (ii).

a The mass emission rate of halogen atoms contained in organic compounds is determined according to the procedures specified in § 63.1104(i). b The percent by weight organic HAP is determined according to the procedures specified in § 63.1107. c The weight-percent organic HAP is determined for equipment according to procedures specified in § 63.1107.

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(ii) The owner or operator must con- operator of an affected source does not trol organic HAP emissions from the have to perform tests, TRE calcula- acrylic and modacrylic fibers produc- tions or other applicability assessment tion facility by meeting the applicable procedures if they opt to comply with requirements specified in table 3 of this the most stringent requirements for an section. The owner or operator must applicable emission point pursuant to determine the facility acrylonitrile this subpart. General compliance, rec- emission rate using the procedures ordkeeping, and reporting require- specified in paragraph (b)(5) of this sec- ments are specified in §§ 63.1108 through tion. Applicability assessment proce- 63.1112. Procedures for approval of al- dures and methods are specified in ternative means of emission limita- §§ 63.1104 through 63.1107. An owner or tions are specified in § 63.1113.

TABLE 3 TO § 63.1103(B)(3)(II)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE AN ACRYLIC AND MODACRYLIC FIBER PRODUCTION EXISTING OR NEW AFFECTED SOURCE AND AM COMPLYING WITH PARAGRAPH (B)(3)(II) OF THIS SECTION?

If you own or operate... Then you must control total organic HAP emissions from the affected source by...

1. An acrylic and modacrylic fibers produc- Meeting all of following requirements: tion affected source and your facility is a. Reduce total acrylonitrile emissions from all affected storage vessels, process an existing source. vents, wastewater streams associated with the acrylic and modacrylic fibers production process unit as defined in paragraph (b)(2) of this section, and fiber spinning lines operated in your acrylic and modacrylic fibers production facility to less than or equal to 0.5 kilograms (kg) of acrylonitrile per megagram (Mg) of fiber produced. b. Determine the facility acrylonitrile emission rate in accordance with the requirements specified in paragraph (b)(5) of this section. 2. An acrylic and modacrylic fibers produc- Meeting all of following requirements: tion affected source and your facility is a a. Reduce total acrylonitrile emissions from all affected storage vessels, process new source. vents, wastewater streams associated with the acrylic and modacrylic fibers production process unit as defined in paragraph (b)(2) of this section, and fiber spinning lines operated in your acrylic and modacrylic fibers production facility to less than or equal to 0.25 kilograms (kg) of acrylonitrile per megagram (Mg) of fiber produced. b. Determine the facility acrylonitrile emission rate in accordance with the requirements specified in paragraph (b)(5) of this section. 3. Equipment as defined under § 63.1101 Meeting either of the following standards for equipment leaks: and it contains or contacts > 10 weight- a. Comply with subpart TT of this part; or percent acrylonitrile, a and operates > b. Comply with subpart UU of this part. 300 hours per year. a The weight-percent organic HAP is determined for equipment according to procedures specified in § 63.1107.

(4) Fiber spinning line enclosure re- worker access; passage of material into quirements. For an owner or operator of or out of the enclosure by conveyor, ve- a new or modified source electing to hicles, or other mechanical means; comply with paragraph (b)(3)(i) of this entry of permanent mechanical or elec- section, the fiber spinning line enclo- trical equipment; or to direct airflow sure must be designed and operated to into the enclosure. meet the requirements specified in (iv) The owner or operator must per- paragraphs (b)(4)(i) through (iv) of this form the verification procedure for the section. enclosure as specified in section 5.0 to (i) The enclosure must cover the ‘‘Procedure T—Criteria for and spinning and washing areas of the spin- Verification of a Permanent or Tem- ning line. (ii) The enclosure must be designed porary Total Enclosure’’ initially when and operated in accordance with the the enclosure is first installed and, criteria for a permanent total enclo- thereafter, annually. sure as specified in ‘‘Procedure T—Cri- (5) Facility acrylonitrile emission rate teria for and Verification of a Perma- determination. For an owner or operator nent or Temporary Total Enclosure’’ in electing to comply with paragraph 40 CFR 52.741, appendix B. (iii) The enclosure may have permanent or temporary openings to allow

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(b)(3)(ii) of this section, the facility ac- two pipelines or a pipeline and a piece rylonitrile emission rate must be de- of equipment. A common connector is a termined using the requirements speci- flange. Joined fittings welded com- fied in paragraphs (b)(5)(i) through (iii) pletely around the circumference of of this section. the interface are not considered con- (i) The owner or operator must pre- nectors for the purposes of this sub- pare an initial determination of the fa- part. cility acrylonitrile emission rate. Equipment means each pump, com- (ii) Whenever changes to the acrylic pressor, agitator, pressure relief device, or modacrylic fiber production oper- sampling connection system, open- ations at the facility could potentially ended valve or line, valve, connector, cause the facility acrylonitrile emis- and instrumentation system in hydro- sion rate to exceed the applicable limit gen fluoride service; and any control of kilogram of acrylonitrile per devices or closed-vent systems used to Megagram of fiber produced, the owner comply with this subpart. or operator must prepare a new deter- Hydrogen fluoride production means a mination of the facility acrylonitrile process engaged in the production and emission rate. recovery of hydrogen fluoride by react- (iii) For each determination, the ing calcium fluoride with sulfuric acid. owner or operator must prepare and For the purpose of implementing this maintain at the facility site sufficient subpart, hydrogen fluoride production process data, emissions data, and any is not a process that produces gaseous other documentation necessary to sup- hydrogen fluoride for direct reaction port the facility acrylonitrile emission with hydrated aluminum to form alu- rate calculation. minum fluoride (i.e., the hydrogen flu- (c) Hydrogen fluoride production appli- oride is not recovered as an inter- cability, definitions, and requirements— mediate or final product prior to react- (1) Applicability—(i) Affected source—For ing with the hydrated aluminum). the hydrogen fluoride production (as In hydrogen fluoride service means defined in paragraph (c)(2) of this sec- that a piece of equipment either con- tion) source category, the affected tains or contacts a hydrogen fluoride source shall comprise all emission process fluid (liquid or gas). points, in combination, listed in para- In vacuum service means that equip- graphs (c)(1)(i)(A) through (D) of this ment is operating at an internal pres- section, that are associated with a hy- sure which is at least 5 kilopascals drogen fluoride production process unit below ambient pressure. located at a major source as defined in Instrumentation system means a group section 112(a) of the Act. of equipment components used to con- (A) All storage vessels used to accu- dition and convey a sample of the proc- mulate or store hydrogen fluoride. ess fluid to analyzers and instruments (B) All process vents from continuous for the purpose of determining process unit operations associated with hydro- operating conditions (e.g., composi- gen fluoride recovery and refining op- tion, pressure, flow, etc.). Valves and erations. These process vents include connectors are the predominant type of vents on condensers, distillation units, equipment used in instrumentation and water scrubbers. systems; however, other types of equip- (C) All transfer racks used to load ment may also be included in these hydrogen fluoride into tank trucks or systems. railcars. Kiln seal means the mechanical or (D) Equipment in hydrogen fluoride hydraulic seals at both ends of the service (as defined in paragraph (c)(2) kiln, designed to prevent the infiltra- of this section). tion of moisture and air through the (ii) Compliance schedule. The compli- interface of the rotating kiln and sta- ance schedule, for affected sources as tionary pipes and equipment attached defined in paragraph (c)(1)(i) of this to the kiln during normal vacuum op- section, is specified in § 63.1102(a). eration of the kiln (operation at an in- (2) Definitions. ternal pressure of at least 0.25 Connector means flanged, screwed, or kilopascal [one inch of water] below other joined fittings used to connect ambient pressure).

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Leakless pump means a pump whose otherwise altered, to eliminate a leak seals are submerged in liquid, a mag- identified by sensory monitoring. netically-driven pump, a pump Sampling connection system means an equipped with a dual mechanical seal assembly of equipment within a proc- system that includes a barrier fluid ess unit or affected facility used during system, a canned pump, or other pump periods of representative operation to that is designed with no externally ac- take samples of the process fluid. tuated shaft penetrating the pump Equipment used to take nonroutine housing. grab samples is not considered a sam- Open-ended valve or line means any pling connection system. valve, except relief valves, having one side of the valve seat in contact with Sensory monitoring means the detec- process fluid and one side open to the tion of a potential leak to the atmos- atmosphere, either directly or through phere by walk-through visual, audible, open piping. or olfactory monitoring. Comprehen- Pressure release means the emission of sive component-by-component inspec- materials resulting from the system tion is not required. pressure being greater than the set Shift means the time a shift operator pressure of the relief device. This re- normally works, typically 8 or 12 lease can be one release or a series of hours. releases over a short time period due to (3) Requirements. Table 4 of this sec- a malfunction in the process. tion specifies the hydrogen fluoride Pressure relief device or valve means a production source category applica- safety device used to prevent operating bility and control requirements for pressures from exceeding the maximum both existing and new sources. The allowable working pressure of the proc- owner or operator must control hydro- ess equipment. A common pressure re- gen fluoride emissions from each af- lief device is a spring-loaded pressure fected source emission point as speci- relief valve. Devices that are actuated fied in table 4. General compliance, either by a pressure of less than or recordkeeping, and reporting require- equal to 2.5 pounds per square inch gauge or by a vacuum are not pressure ments are specified in §§ 63.1108 through relief devices. 63.1112. Specific monitoring, record- Relief device or valve means a valve keeping, and reporting requirements used only to release an unplanned, non- are specified in table 4. Minimization routine discharge. A relief valve dis- of emissions from startups, shutdowns, charge can result from an operator and malfunctions, including those re- error, a malfunction such as a power sulting from kiln seals must be ad- failure or equipment failure, or other dressed in the startup, shutdown, and unexpected cause that requires imme- malfunction plan required by § 63.1111; diate venting of gas from process the plan must also establish reporting equipment in order to avoid safety haz- and recordkeeping of such events. Pro- ards or equipment damage. cedures for approval of alternative Repaired for the purpose of this regu- means of emission limitations are spec- lation means equipment is adjusted, or ified in § 63.1113.

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TABLE 4 TO § 63.1103(C)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A HYDROGEN FLUORIDE PRODUCTION EXISTING OR NEW AFFECTED SOURCE?

If you own or operate . . . And if . . . Then you must . . .

1. A storage vessel ...... The stored material is hydrogen fluoride Reduce emissions of hydrogen fluoride by venting displacement emissions created by normal filling or emptying activities through a closed-vent system to a recovery system or wet scrubber that is designed and operated to achieve a 99 weight-percent removal efficiency. The minimum liquid flow rate to the scrubber that achieves a 99 weight-percent removal efficiency shall be established, and may be done so by design analysis. The liquid flow rate to the scrubber shall be continuously monitored and records main- tained according to §§ 63.996 and 63.998(b), (c), and (d)(3) of 40 CFR subpart SS of this part. The Periodic Report specified in § 63.1110(a)(5) of this subpart shall include the information specified in § 63.999(c) of 40 CFR subpart SS of this part, as applicable. 2. A process vent from continuous unit The vent stream is from hydrogen fluo- Reduce emissions of hydrogen fluoride operations. ride recovery and refining vessels. from the process vent by venting emissions through a closed-vent system to a wet scrubber that is designed and operated to achieve a 99 weight- percent removal efficiency. Monitoring, recordkeeping, and reporting of wet scrubber operation shall be in accordance with the requirements stated above for a wet scrubber controlling hydrogen fluoride emissions from a storage vessel. 3. A transfer rack ...... The transfer rack is associated with bulk Reduce emissions of hydrogen fluoride hydrogen fluoride liquid loading into by venting emissions through a tank trucks and rail cars. closed-vent system to a recovery system or wet scrubber that is designed and operated to achieve a 99 weight- percent removal efficiency. Monitoring, recordkeeping, and reporting of wet scrubber operation shall be in accordance with the requirements stated above for a wet scrubber controlling HF emissions from a storage vessel. You also must load hydrogen fluoride into only tank trucks and railcars that have a current certification in accordance with the U.S. DOT pressure test requirements of 49 CFR part 180 for tank trucks and 49 CFR 173.31 for railcars; or have been demonstrated to be vapor-tight (i.e. will sustain a pressure change of not more than 750 Pascals within 5 minutes after it is pressurized to a minimum or 4,500 Pascals) within the preceding 12 months.

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TABLE 4 TO § 63.1103(C)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A HYDROGEN FLUORIDE PRODUCTION EXISTING OR NEW AFFECTED SOURCE?—Continued

If you own or operate . . . And if . . . Then you must . . .

4. Equipment ...... It is in hydrogen fluoride service and op- Control hydrogen fluoride emissions by erates ≥ 300 hours per year and is not using leakless pumps and by imple- in vacuum service. menting a sensory monitoring leak de- tection program. Equipment that is ex- cluded from sensory monitoring be- cause it operates less than 300 hours per year or is in vacuum service shall be identified by list, location, or other method and the identity shall be re- corded. An owner or operator is required to perform sensory monitoring at least once every shift, but no later than within 15 days. When a leak is detected, repair must begin within one hour and be completed as soon as practical. A record shall be kept of each leak detected and repaired including: equipment identification number, date and time the leak was detected and that repair was initiated, and the date of successful repair.

(d) Polycarbonate production applica- (C) All wastewater streams. bility, definitions, and requirements—(1) (D) Equipment (as defined in § 63.1101 Applicability—(i) Affected source. For of this subpart) that contains or con- the polycarbonate production (as de- tacts organic HAP. fined in paragraph (d)(2) of this sec- (ii) Compliance schedule. The compli- tion) source category, the affected ance schedule, for affected sources as source shall comprise all emission defined in paragraph (d)(1)(i) of this points, in combination, listed in para- section, is specified in § 63.1102(a). graphs (d)(1)(i)(A) through (D) of this (2) Definitions. section, that are part of a Polycarbonate production means a polycarbonate production process unit process engaged in the production of a located at a major source as defined in special class of polyester formed from section 112(a) of the Act. For the pur- any dihydroxy compound and any car- poses of this rule, a polycarbonate pro- bonate diester or by ester exchange. duction process unit is a unit that pro- Polycarbonate may be produced by so- duces polycarbonate by interfacial po- lution or emulsion polymerization, al- lymerization from bisphenols and phos- though other methods may be used. A gene. Phosgene production units that typical method for the manufacture of are associated with polycarbonate pro- polycarbonate includes the reaction of duction process units are considered to bisphenol-A with phosgene in the pres- be part of the polycarbonate produc- ence of pyridine or other catalyst to tion process. A phosgene production form polycarbonate. Methylene chlo- unit consists of the reactor in which ride or other solvents are used in this phosgene is formed and all equipment polymerization reaction. (listed in paragraphs (d)(1)(i)(A) (3) Requirements. Tables 5 and 6 of through (D) of this section) down- this section specify the applicability stream of the reactor that provides criteria and standards for existing and phosgene for the production of new sources within the polycarbonate polycarbonate. Therefore, for the pur- production source category. The owner poses of this rule, such a phosgene pro- or operator must control organic HAP duction unit is considered to be a emissions from each affected source polycarbonate production process unit. emission point by meeting the applica- (A) All storage vessels that store liq- ble requirements specified in tables 5 uids containing organic HAP. and 6. Applicability assessment proce- (B) All process vents from continuous dures and methods are specified in and batch unit operations. §§ 63.1104 through 63.1107. An owner or

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operator of an affected source is not re- this subpart. General compliance, rec- quired to perform tests, TRE calcula- ordkeeping, and reporting require- tions or other applicability assessment ments are specified in §§ 63.1108 through procedures if they opt to comply with 63.1112. Procedures for approval of al- the most stringent requirements for an ternative means of emission limita- applicable emission point pursuant to tions are specified in § 63.1113.

TABLE 5 TO § 63.1103(D)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A POLYCARBONATE PRODUCTION EXISTING AFFECTED SOURCE?

If you own or operate... And if... Then you must...

1. A storage vessel with: 75 cubic meters 27.6 kilopascals ≤ maximum true vapor Reduce emissions of total organic HAP ≤ capacity < 151 cubic meters. pressure of total organic HAP < 76.6 by 95 weight-percent by venting emis- kilopascals. sions through a closed vent system to any combination of control devices meeting the requirements of subpart SS (national emission standards for closed vent systems, control devices, recovery devices, and routing to a fuel gas system or a process), as specified in § 63.982(a)(1) (storage vessel requirements) of this part; or comply with the requirements of subpart WW (national emission standards for storage vessels (control level 2)) of this part. 2. A storage vessel with: 151 cubic me- The maximum true vapor pressure of Reduce emissions of total organic HAP ters ≤ capacity. total organic HAP ≥ 5.2 kilopascals. by 98 weight-percent by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(1) (storage vessel requirements) of this part 3. A storage vessel with: 75 cubic meters The maximum true vapor pressure of Reduce emissions of total organic HAP ≤ capacity < 151 cubic meters. total organic HAP ≥ 76.6 kilopascals. by 95 weight-percent by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(1) (storage vessel requirements) of this part. 4. A process vent from continuous unit The vent stream has a TRE b,c ≤ 2.7 ...... a. Reduce emissions of total organic operations or a combined vent stream a. HAP by 98 weight-percent; or reduce total organic HAP to a concentration of 20 parts per million by volume; whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(2) (process vent requirements) of this part and vent emissions through a closed vent system to a halogen reduction device meeting the requirements of subpart SS, § 63.994, of this part, that reduces hydrogen halides and halogens by 99 weight- percent or to less than 0.45 kilograms per hour d, whichever is less stringent; or

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TABLE 5 TO § 63.1103(D)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A POLYCARBONATE PRODUCTION EXISTING AFFECTED SOURCE?—Continued

If you own or operate... And if... Then you must...

...... b. Reduce the process vent halogen atom mass emission rate to less than 0.45 kilograms per hour by venting emissions through a closed vent system to a halogen reduction device meeting the requirements of subpart SS, § 63.994 (halogen reduction device requirements) of this part and reduce emissions of total organic HAP by 98 weight-percent; or reduce total organic HAP or TOC to a concentration of 20 parts per million by volume; whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(2) (process vent requirements) of this part; or c. Achieve and maintain a TRE index value greater than 2.7. 5. A process vent from continuous unit 2.7 < TRE b,c ≤ 4.0 ...... Monitor and keep records of equipment operations or a combined vent stream a. operating parameters specified to be monitored under subpart SS, §§ 63.990(c) (absorber, condenser, and carbon adsorber monitoring) or 63.995(c) (other noncombustion systems used as a control device monitoring) of this part. 6. Equipment as defined under § 63.1101 The equipment contains or contacts ≥ 5 Comply with the requirements of subpart weight-percent total organic HAP e, TT (national emission standards for and operates ≥ 300 hours per year. equipment leaks (control level 1)) or subpart UU (national emission standards for equipment leaks (control level 2)) of this part. 7. A polycarbonate production process The process wastewater stream is a Comply with the requirements of unit that generates process wastewater. Group 1 or a Group 2 wastewater § 63.1106(a). stream. 8. A polycarbonate production process The maintenance wastewater contains Comply with the requirements of unit that generates maintenance waste- organic HAP. § 63.1106(b). water. 9. An item of equipment listed in The item of equipment meets the criteria Comply with the requirements in Table § 63.1106(c)(1). specified in § 63.1106(c)(1) through (3) 35 of subpart G of this part. and either (c)(4)(i) or (ii).

a Combined vent streams shall use the applicability determination procedures and methods for process vents from continuous unit operations (§ 63.1104). b The TRE equation coefficients for halogenated streams (table 1 of § 63.1104(j)(1)) shall be used to calculate the TRE index value. c The TRE is determined according to the procedures specified in § 63.1104(j). If a dryer is manifolded with such vents, and the vent is routed to a recovery, recapture, or combustion device, then the TRE index value for the vent must be calculated based on the properties of the vent stream (including the contributions of the dryer). If a dryer is manifolded with other vents and not routed to a recovery, recapture, or combustion device, then the TRE index value must be calculated excluding the contributions of the dryer. The TRE index value for the dryer must be calculated separately in this case. d The mass emission rate of halogen atoms contained in organic compounds is determined according to the procedures specified in § 63.1104(i). e The weight-percent organic HAP is determined for equipment according to procedures specified in § 63.1107.

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TABLE 6 TO § 63.1103(D)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A POLYCARBONATE PRODUCTION NEW AFFECTED SOURCE?

If you own or operate. . . And if. . . Then you must. . .

1. A storage vessel with: 38 cubic meters 13.1 kilopascals ≤maximum true vapor a. Reduce emissions of total organic ≤capacity <151 cubic meters. pressure of total organic HAP <76.6 HAP by 95 weight-percent by venting kilopascals. emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS (national emission standards for closed vent systems, control devices, recovery devices, and routing to a fuel gas system or a process), as specified in § 63.982(a)(1) (storage vessel requirements) of this part; or b. Comply with the requirements of subpart WW (national emission standards for storage vessels (control level 2)) of this part. 2. A storage vessel with: 151 cubic me- The maximum true vapor pressure of Reduce emissions of total organic HAP ters ≤capacity. total organic HAP is ≥5.2 kilopascals. by 98 weight-percent by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(1) (storage vessel requirements) of this part. 3. A storage vessel with: 38 cubic meters The maximum true vapor pressure of Reduce emissions of total organic HAP ≤capacity <151 cubic meters. total organic HAP is ≥76.6 kilopascals. by 95 weight-percent by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(1) (storage vessel requirements) of this part.

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TABLE 6 TO § 63.1103(D)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A POLYCARBONATE PRODUCTION NEW AFFECTED SOURCE?—Continued

If you own or operate. . . And if. . . Then you must. . .

4. A process vent from continuous unit The vent stream has a TRE b,c ≤9.6 ...... a. Reduce emissions of total organic operations or a combined vent stream a. HAP by 98 weight-percent; or reduce total organic HAP to a concentration of 20 parts per million by volume; whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(2) (process vent requirements) of this part; and Vent emissions through a closed vent system to a halogen reduction device meeting the requirements of subpart SS, § 63.994, of this part that reduces hydrogen halides and halogens by 99 weight-percent or to less than 0.45 kilograms per hourd, d, whichever is less stringent; or b. Reduce the process vent halogen atom mass emission rate to less than 0.45 kilograms per hour by venting emissions through a closed vent system to a halogen reduction device meeting the requirements of subpart SS, § 63.994 (halogen reduction device requirements) of this part; and Reduce emissions of total organic HAP by 98 weight-percent; or reduce total organic HAP or TOC to a concentration of 20 parts per million by volume; whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of subpart SS, as specified in § 63.982(a)(2) (process vent requirements) of this part; or c. Achieve and maintain a TRE index value greater than 9.6. 5. Equipment as defined under § 63.1101 The equipment contains or contacts ≥ 5 Comply with the requirements of subpart weight-percent total organic HPA e, TT (national emission standards for and operates ≥ 300 hours per year. equipment leaks (control level 1)) or subpart UU (national emission standards for equipment leaks (control level 2)) of this part. a Combined vent streams shall use the applicability determination procedures and methods for process vents from continuous unit operations (§ 63.1104). b The TRE equation coefficients for halogenated streams (Table 1 of § 63.1104(j)(1) of this subpart) shall be used to calculate the TRE index value. c The TRE is determined according to the procedures specified in § 63.1104(j). If a dryer is manifolded with such vents, and the vent is routed to a recovery, recapture, or combustion device, then the TRE index value for the vent must be calculated based on the properties of the vent stream (including the contributions of the dryer). If a dryer is manifolded with other vents and not routed to a recovery, recapture, or combustion device, then the TRE index value must be calculated excluding the contributions of the dryer. The TRE index value for the dryer must be calculated separately in this case. d The mass emission rate of halogen atoms contained in organic compounds is determined according to the procedures specified in § 63.1104(i). e The weight-percent organic HAP is determined for equipment according to procedures specified in § 63.1107.

(e) Ethylene production applicability, this section that are associated with an definitions, and requirements—(1) Appli- ethylene production unit that is lo- cability—(i) Affected source. For the cated at a major source, as defined in ethylene production (as defined in section 112(a) of the Act. paragraph (e)(2) of this section) source (A) All storage vessels (as defined in category, the affected source shall § 63.1101) that store liquids containing comprise all emission points listed in organic HAP. paragraphs (e)(1)(i) (A) through (G) of

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(B) All ethylene process vents (as de- tion source category is specified in fined in paragraph (e)(2) of this section) § 63.1102. from continuous unit operations. (2) Definitions. Ethylene process vent (C) All transfer racks (as defined in means a gas stream with a flow rate paragraph (e)(2) of this section) that greater than 0.005 standard cubic me- load HAP-containing material. ters per minute containing greater (D) Equipment (as defined in § 63.1101) than 20 parts per million by volume that contains or contacts organic HAP. HAP that is continuously discharged (E) All waste streams (as defined in during operation of an ethylene pro- paragraph (e)(2) of this section) associ- duction unit, as defined in this section. ated with an ethylene production unit. Ethylene process vents are gas streams (F) All heat exchange systems (as de- that are discharged to the atmosphere fined in paragraph (e)(2) of this section) (or the point of entry into a control de- associated with an ethylene production vice, if any) either directly or after unit. passing through one or more recovery (G) All ethylene cracking furnaces devices. Ethylene process vents do not and associated decoking operations. include relief valve discharges; gaseous (ii) Exceptions. The emission points streams routed to a fuel gas system; listed in paragraphs (e)(1)(ii) (A) leaks from equipment regulated under through (L) of this section are in the this subpart; episodic or nonroutine re- ethylene production source category leases such as those associated with but are not subject to the requirements startup, shutdown, and malfunction; of paragraph (e)(3) of this section. and in situ sampling systems (online (A) Equipment that is located within analyzers). an ethylene production unit that is Ethylene production or production unit subject to this subpart but does not means a chemical manufacturing proc- contain organic HAP. ess unit in which ethylene and/or pro- (B) Stormwater from segregated sew- pylene are produced by separation from ers. petroleum refining process streams or (C) Water from fire-fighting and del- by subjecting hydrocarbons to high uge systems in segregated sewers. temperatures in the presence of steam. (D) Spills. The ethylene production unit includes (E) Water from safety showers. the separation of ethylene and/or pro- (F) Water from testing of fire-fight- pylene from associated streams such as ing and deluge systems. a C4 product, pyrolysis gasoline, and (G) Vessels storing organic liquids pyrolysis fuel oil. Ethylene production that contain organic HAP as impuri- does not include the manufacture of ties. SOCMI chemicals such as the produc- (H) Transfer racks, loading arms, or tion of butadiene from the C4 stream loading hoses that only transfer liquids and aromatics from pyrolysis gasoline. containing organic HAP as impurities. Heat exchange system means any cool- (I) Transfer racks, loading arms, or ing tower system or once-through cool- loading hoses that vapor balance during water system (e.g., river or pond ing all transfer operations. water). A heat exchange system can in- (J) Air emissions from all ethylene clude an entire recirculating or once- cracking furnaces, including emissions through cooling system. during decoking operations. Organic HAP means the compounds (K) Pressure vessels designed to oper- listed in Table 1 to subpart XX of this ate in excess of 204.9 kilopascals and part. without emissions to the atmosphere. Transfer rack means the collection of (L) Vessels permanently attached to loading arms and loading hoses at a motor vehicles such as trucks, railcars, single loading rack that is used to fill barges, or ships. tank trucks and/or railcars with or- (iii) Exclusions. The provisions of this ganic HAP. Transfer rack includes the subpart do not apply to process units associated pumps, meters, shutoff and emission points subject to subparts valves, relief valves, and other piping F, G, H, I and CC of this part. and valves. Transfer rack does not in- (iv) Compliance schedule. The compli- clude racks, arms, or hoses that con- ance schedule for the ethylene produc- tain organic HAP only as impurities;

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or racks, arms, or hoses that vapor bal- sions from each affected source emis- ance during all loading operations. sion point by meeting the applicable Waste means any material resulting requirements specified in Table 7 to from industrial, commercial, mining, this section. An owner or operator or agricultural operations, or from must perform the applicability assess- community activities, that is discarded ment procedures and methods for proc- or is being accumulated, stored, or ess vents specified in § 63.1104, except physically, chemically, thermally, or for paragraphs (d), (g), (h), (i), (j), (l)(1), biologically treated prior to being dis- and (n). An owner or operator must carded, recycled, or discharged. perform the applicability assessment Waste stream means the waste gen- procedures and methods for equipment erated by a particular process unit, leaks specified in § 63.1107. General product tank, or waste management compliance, recordkeeping, and report- unit. The characteristics of the waste ing requirements are specified in stream (e.g., flow rate, HAP concentra- §§ 63.1108 through 63.1112. Minimization tion, water content) are determined at of emissions from startup, shutdown, the point of waste generation. Exam- and malfunctions must be addressed in ples of a waste stream include process the startup, shutdown, and malfunc- wastewater, product tank drawdown, tion plan required by § 63.1111; the plan sludge and slop oil removed from waste must also establish reporting and rec- management units, and landfill leach- ordkeeping of such events. Procedures ate. for approval of alternate means of (3) Requirements. The owner or oper- emission limitations are specified in ator must control organic HAP emis- § 63.1113.

TABLE 7 TO § 63.1103(E)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE AN ETHYLENE PRODUCTION EXISTING OR NEW AFFECTED SOURCE?

If you own or operate . . . And if . . . Then you must . . .

(a) A storage vessel (as defined in (1) The maximum true vapor pressure of (i) Fill the vessel through a submerged § 63.1101) that stores liquid containing total organic HAP is ≥3.4 kilopascals pipe; or organic HAP. but <76.6 kilopascals; and the capac- (ii) Comply with the requirements for ity of the vessel is ≥4 cubic meters but storage vessels with capacities ≥95 ≤95 cubic meters. cubic meters. (b) A storage vessel (as defined in (1) The maximum true vapor pressure of (i) Comply with the requirements of sub- § 63.1101) that stores liquid containing total organic HAP is ≥3.4 kilopascals part WW of this part; or organic HAP. but <76.6 kilopascals; and the capac- (ii) Reduce emissions of total organic ity of the vessel is ≥95 cubic meters. HAP by 98 weight-percent by venting emissions through a closed vent system to any combination of control devices and meet the requirements of § 63.982(a)(1). (c) A storage vessel (as defined in (1) The maximum true vapor pressure of (i) Reduce emissions of total organic § 63.1101) that stores liquid containing total organic HAP is ≥76.6 kilopascals. HAP by 98 weight-percent by venting organic HAP. emissions through a closed vent system to any combination of control devices and meet the requirements of § 63.982(a)(1). (d) An ethylene process vent (as defined (1) The process vent is at an existing (i) Reduce emissions of organic HAP by in paragraph (e)(2) of this section). source and the vent stream has a flow 98 weight-percent; or reduce organic rate ≥0.011 scmm and a total organic HAP or TOC to a concentration of 20 HAP concentration ≥50 parts per mil- parts per million by volume; whichever lion by volume; or the process vent is is less stringent, by venting emissions at a new source and the vent stream through a closed vent system to any has a flow rate ≥0.008 scmm and a combination of control devices and total organic HAP concentration ≥30 meet the requirements specified in parts per million by volume. § 63.982(b) and (c)(2). (e) A transfer rack (as defined in para- (1) Materials loaded have a true vapor (i) Reduce emissions of organic HAP by graph (e)(2) of this section). pressure of total organic HAP ≥3.4 98 weight-percent; or reduce organic kilopascals and ≥76 cubic meters per HAP or TOC to a concentration of 20 day (averaged over any consecutive parts per million by volume; whichever 30-day period) of HAP-containing ma- is less stringent, by venting emissions terial is loaded. through a closed vent system to any combination of control devices as specified in § 63.1105; or

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TABLE 7 TO § 63.1103(E)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE AN ETHYLENE PRODUCTION EXISTING OR NEW AFFECTED SOURCE?—Continued

If you own or operate . . . And if . . . Then you must . . .

(ii) Install process piping designed to col- lect the HAP-containing vapors dis- placed from tank trucks or railcars during loading and to route it to a process, a fuel gas system, or a vapor balance system, as specified in § 63.1105. (f) Equipment (as defined in § 63.1101) (1) The equipment contains or contacts Comply with the requirements of subpart that contains or contacts organic HAP. ≥5 weight-percent organic HAP; and UU of this part. the equipment is not in vacuum service. (g) Processes that generate waste (as de- (1) The waste stream contains any of (i) Comply with the waste requirements fined in paragraph (e)(2) of this section. the following HAP: benzene, cumene, of subpart XX of this part. For ethyl- ethyl benzene, hexane, naphthalene, ene manufacturing process unit waste styrene, toluene, o-xylene, m-xylene, stream requirements, terms have the p-xylene, or 1,3-butadiene. meanings specified in subpart XX. (h) A heat exchange system (as defined ...... Comply with the heat exchange system in paragraph (e)(2) of this section). requirements of subpart XX of this part.

(f) Carbon black production applica- product storage vessels, product trans- bility, definitions, and requirements—(1) fer racks, and connected ducts and pip- Applicability—(i) Affected source. For ing. A carbon black production process the carbon black production source unit includes pumps, compressors, agi- category (as defined in paragraph (f)(2) tators, pressure relief devices, sam- of this section), the affected source pling connection systems, open-ended shall comprise each carbon black pro- valves or lines, valves, connectors, in- duction process unit located at a major strumentation systems, and control de- source, as defined in section 112(a) of vices or systems. the Act. The affected source for the Dryer means a rotary-kiln dryer that carbon black production source cat- is heated externally and is used to dry egory includes all waste management wet pellets in the wet pelletization units, maintenance wastewater, and process. equipment components that contain or Main unit filter means the filter that contact HAP that are associated with separates the carbon black from the the carbon black production process tailgas. unit. (ii) Compliance schedule. The compli- Process filter means the filter that ance schedule for the carbon black pro- separates the carbon black from the duction and acetylene decomposition conveying air. carbon black production affected Purge filter means the filter that sep- sources, as defined in paragraph (f)(1)(i) arates the carbon black from the dryer of this section, is specified in § 63.1102. exhaust. (2) Definitions. Carbon black production (3) Requirements. (i) Table 8 to this means the production of carbon black section specifies the carbon black pro- by either the furnace, thermal, acety- duction standards applicability for ex- lene decomposition, or lampblack proc- isting and new sources. Applicability esses. assessment procedures and methods are Carbon black production unit means specified in § 63.1104. An owner or oper- the equipment assembled and con- ator of an affected source is not re- nected by hard-piping or duct work to quired to perform applicability tests or process raw materials to manufacture, other applicability assessment proce- store, and transport a carbon black dures if they opt to comply with the product. For the purposes of this sub- most stringent requirements for an ap- part, a carbon black production process plicable emission point pursuant to unit includes reactors and associated this subpart. General compliance, rec- operations; associated recovery de- ordkeeping, and reporting require- vices; and any feed, intermediate and ments are specified in §§ 63.1108 through

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63.1112. Procedures for approval of al- process filter system are exempt from ternative means of emission limita- the closed vent system inspection re- tions are specified in § 63.1113. quirements of § 63.983(b) and (c). Ex- (ii) Pressure relief devices used to empt pressure relief devices must be protect against overpressure in the designated and identified in your Noti- case of catastrophic failure of your fication of Compliance Status report.

TABLE 8 TO § 63.1103(F)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A CARBON BLACK PRODUCTION EXISTING OR NEW AFFECTED SOURCE?

If you own or operate . . . And if . . . Then you must . . .

(a) A carbon black production main unit (1) The HAP concentration of the emis- (i) Reduce emissions of HAP by using a filter process vent. sion stream is equal to or greater than flare meeting the requirements of sub- 260 parts per million by volume a. part SS of this part; or (ii) Reduce emissions of total HAP by 98 weight-percent or to a concentration of 20 parts per million by volume, whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of § 63.982(a)(2). a The weight-percent organic HAP is determined according to the procedures specified in § 63.1104(e).

(g) Cyanide chemicals manufacturing sodium cyanide is formed is considered applicability, definitions, and require- to be part of the Andrussow process ments—(1) Applicability—(i) Affected unit. source. For the cyanide chemicals man- Blausaure Methane Anlage (BMA) ufacturing source category, the af- process unit means a process unit that fected source shall include each cya- produces hydrogen cyanide by reacting nide chemicals manufacturing process methane and ammonia over a platinum unit located at a major source, as de- catalyst. A BMA process unit begins at fined in section 112(a) of the Act. The the point at which raw materials are affected source shall also include all stored and ends at the point at which waste management units, maintenance refined hydrogen cyanide is reacted as wastewater, and equipment (as defined a raw material in a downstream proc- in § 63.1101) that contain or contact cy- ess, burned on-site as a fuel in a boiler anide chemicals that are associated or industrial furnace, or is shipped off- with the cyanide chemicals manufac- site. If raw hydrogen cyanide from the turing process unit. reactor is reacted with sodium hydrox- (ii) Compliance schedule. The compli- ide to form sodium cyanide prior to the ance schedule for the affected source, refining process, the unit operation as defined in paragraph (f)(1)(i) of this where sodium cyanide is formed is con- section, is specified in § 63.1102. sidered to be part of the BMA process (2) Definitions. Andrussow process unit unit. means a process unit that produces hy- Byproduct means a chemical that is drogen cyanide by reacting methane produced coincidentally during the and ammonia in the presence of oxygen production of another chemical. over a platinum/rhodium catalyst. An Cyanide chemicals manufacturing proc- Andrussow process unit begins at the ess unit or CCMPU means the equip- point at which the raw materials are ment assembled and connected by stored and ends at the point at which hard-piping or duct work to process refined hydrogen cyanide is reacted as raw materials to manufacture, store, a raw material in a downstream proc- and transport a cyanide chemicals ess, burned on-site as fuel in a boiler or product. A cyanide chemicals manufac- industrial furnace, or is shipped offsite. turing process unit shall be limited to If raw hydrogen cyanide from the reac- any one of the following: an Andrussow tor is reacted with sodium hydroxide to process unit, a BMA process unit, a so- form sodium cyanide prior to the refin- dium cyanide process unit, or a Sohio ing process, the unit operation where hydrogen cyanide process unit. For the

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purpose of this subpart, a cyanide Sodium cyanide process unit means a chemicals manufacturing process unit process unit that produces sodium cya- includes reactors and associated unit nide by reacting hydrogen cyanide and operations; associated recovery de- sodium hydroxide via the neutraliza- vices; and any feed, intermediate and tion, or wet, process. A sodium cyanide product storage vessels, product trans- process unit begins at the unit oper- fer racks, and connected ducts and pip- ation where refined hydrogen cyanide ing. A cyanide chemicals manufac- is reacted with sodium hydroxide and turing process unit includes pumps, ends at the point the solid sodium cya- compressors, agitators, pressure relief nide product is shipped offsite or used devices, sampling connection systems, as a raw material in a downstream open-ended valves or lines, valves, con- process. If raw hydrogen cyanide is re- nectors, instrumentation systems, and acted with sodium hydroxide to form control devices or systems. sodium cyanide prior to the hydrogen Cyanide chemicals product means ei- cyanide refining process, the unit oper- ther hydrogen cyanide, potassium cya- ation where sodium cyanide is formed nide, or sodium cyanide which is manu- is not considered to be part of the so- factured as the intended product of a dium cyanide process unit. For this CCMPU or a byproduct of the Sohio type of process, the sodium cyanide process. Other hydrogen cyanide, po- process unit begins at the point that tassium cyanide, or sodium cyanide by- the aqueous sodium cyanide stream products, impurities, wastes, and trace leaves the unit operation where the so- contaminants are not considered to be dium cyanide is formed. In situations cyanide chemicals products. where potassium hydroxide is sub- Dry-end process vent means a process stituted for sodium hydroxide to vent originating from the drum filter produce potassium cyanide, the process or any other unit operation in the dry unit is still considered a sodium cya- end of a sodium cyanide manufacturing nide process unit. process unit. For the purposes of this Sohio hydrogen cyanide process unit subpart, the dry end of the sodium cya- means a process unit that produces hy- nide process unit begins in the unit op- drogen cyanide as a byproduct of the eration where water is removed from acrylonitrile production process when the sodium cyanide, usually in the acrylonitrile is manufactured using the drum filter, and ends when the sodium Sohio process. A Sohio hydrogen cya- cyanide is used as a raw material in a nide process unit begins at the point downstream process, or is shipped off- the hydrogen cyanide leaves the unit site. operation where the hydrogen cyanide Organic HAP means, for purposes of is separated from the acrylonitrile applicability of the requirements of (usually referred to as the heads col- this subpart, all hydrogen cyanide umn). The Sohio hydrogen cyanide compounds. process unit ends at the point refined Raw hydrogen cyanide means hydro- hydrogen cyanide is reacted as a raw gen cyanide that has not been through material in a downstream process, the refining process. Raw hydrogen cy- burned on-site as fuel in a boiler or in- anide usually has a hydrogen cyanide dustrial furnace, or is shipped offsite. If concentration less than 10 percent. raw hydrogen cyanide is reacted with Refined hydrogen cyanide means hy- sodium hydroxide to form sodium cya- drogen cyanide that has been through nide prior to the refining process, the the refining process. Refined hydrogen unit operation where sodium cyanide is cyanide usually has a hydrogen cya- formed is considered to be part of the nide concentration greater than 99 per- Sohio hydrogen cyanide process unit. cent. Wet-end process vent means a process Refining process means the collection vent originating from the reactor, of equipment in a cyanide chemicals crystallizer, or any other unit oper- manufacturing processing unit used to ation in the wet end of the sodium cya- concentrate raw hydrogen cyanide nide process unit. For the purposes of from a concentration around 10 percent this subpart, the wet end of the sodium or less to refined hydrogen cyanide at a cyanide process unit begins at the concentration greater than 99 percent. point at which the raw materials are

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stored and ends just prior to the unit quired to perform applicability tests or operation where water is removed from other applicability assessment proce- the sodium cyanide, usually in the dures if they opt to comply with the drum filter. Wastewater streams con- most stringent requirements for an ap- taining discarded wastewater from the plicable emission point pursuant to sodium cyanide production process are this subpart. General compliance, rec- not considered to be part of the wet- ordkeeping, and reporting require- end sodium cyanide process. Discarded ments are specified in §§ 63.1108 through wastewater that is no longer used in 63.1112. Procedures for approval of al- the production process is considered to ternative means of emission limita- be process and/or maintenance waste- tions are specified in § 63.1113. water. Vents from process and maintenance wastewater operations are not (4) Determination of overall HAP emis- wet-end process vents. sion reduction for a process unit. (i) The (3) Requirements. Table 9 to this sec- owner or operator shall determine the tion specifies the cyanide chemicals overall HAP emission reduction for manufacturing standards applicable to process vents in a process unit using existing and new sources. Applicability Equation 1 of this section. The overall assessment procedures and methods are organic HAP emission reduction shall specified in § 63.1104. An owner or oper- be determined for all process vents in ator of an affected source is not re- the process unit.

⎛ n ⎛ R ⎞ ⎞ ⎜ ∑()E i ⎟ unc, i ⎝100⎠ RED= ⎜ i=1 ⎟ ∗ 100 [Equation 1] CCMPU ⎜ n m ⎟ + ⎜ ∑()EEunc,, i∑() unc j ⎟ ⎝ i=1 j=1 ⎠

Where: provisions of § 63.987, or a combustion

REDCCMPU=Overall HAP emission reduction device in accordance with the provi- for the group of process vents in the sions of § 63.988(b)(2), for which a per- CCMPU, percent. formance test has not been conducted, Eunc,i=Uncontrolled HAP emissions from the control efficiency shall be assumed process vent i that is controlled by using a combustion, recovery, or recapture device, to be 98 weight-percent. For hydrogen- kg/yr. fueled flares, an owner or operator may n=Number of process vents in the process use a control efficiency greater than 98 unit that are controlled by using a com- weight-percent if they can provide en- bustion, recovery, or recapture device. gineering calculations and supporting Ri=Control efficiency of the combustion, re- information demonstrating a greater covery, or recapture device used to control control efficiency. HAP emissions from vent i, determined in accordance with paragraph (g)(4)(ii) of this (B) If the process vent is controlled section. using a combustion, recovery, or recap-

Eunc,j=Uncontrolled HAP emissions from ture device for which a performance process vent j that is not controlled by test has been conducted in accordance using a combustion, recovery, or recapture with the provisions of § 63.997, the con- device, kg/yr. trol efficiency shall be the efficiency m=Number of process vents in the process unit that are not controlled by using a determined by the performance test. combustion, recovery, or recapture device. (5) Source category specific modifica- tions to testing procedures. (i) When (ii) The control efficiency shall be as- identifying equipment subject to any signed as specified in paragraph equipment leak requirements, an (g)(4)(ii) (A) or (B) of this section. owner or operator is allowed to des- (A) If the process vent is controlled ignate specific components of such using a flare in accordance with the

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equipment as never being safe to mon- and malfunction by using a flare, an itor with their Notification of Compli- owner or operator is not required to ance Status report and periodic com- perform flow rate and heat content pliance reports. In order for an owner testing as specified in § 63.987(b)(3)(ii) or operator to designate such equip- and (iii). In lieu of performing flow rate ment as never being safe to monitor, and heat content testing, an owner or they must certify that monitoring such operator is required to submit engi- equipment at any time the CCMPU is neering calculations that substantiate operating is never safe (e.g., moni- that a flare meets the applicable heat toring this equipment would present an content or flow rates, or provide data unreasonable hazard or preclude test- from a compliance assessment that the ing personnel from meeting emergency flare is in compliance under worst case evacuation requirements). If it is dem- conditions (e.g., maximum operating onstrated to the Administrator’s satis- conditions). faction that equipment designated by (iv) If flare velocity and net heating the owner or operator as never safe to value testing, as specified in monitor is appropriately designated, an § 63.11(b)(6)(ii) and (b)(7)(i), would cre- owner or operator will not be required ate an unreasonable hazard for testing to monitor such equipment. personnel, an owner or operator is al- (ii) For process vent hydrogen cya- lowed to submit engineering calcula- nide emissions that are vented to a tions that substantiate vent stream ve- control device other than a flare during locity and heat content of a flare in startup, shutdown, and malfunction, lieu of test data. These calculations are the design evaluation must include required to be submitted with the fa- documentation that the control device cilities’ compliance test notification being used achieves the required con- report for approval by the Adminis- trol efficiency during the reasonably trator. expected maximum flow rate and emis- (v) The data from any performance sion rate during startup, shutdown, and test method used to measure HCN con- malfunction. centrations must be validated using (iii) If a facility controls process vent EPA Method 301 (40 CFR part 63, appen- emissions during startup, shutdown, dix A).

TABLE 9 TO § 63.1103(G)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A CYANIDE CHEMICALS MANUFACTURING EXISTING OR NEW AFFECTED SOURCE?

If you own or operate . . . And if . . . Then you must . . .

(a) A storage vessel ...... (1) The storage vessel contains refined (i) Reduce emissions of hydrogen cya- hydrogen cyanide. nide by using a flare meeting the requirements of § 63.982(b); or (ii) Reduce emissions of hydrogen cyanide by 98 weight-percent, or to a concentration of 20 parts per million by volume, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of § 63.982(c)(1) or (d). (b) A process vent from a continuous unit ...... (i) Reduce overall annual emissions of operations in an Andrussow, BMA, or total HAP from the collection of proc- Sohio hydrogen cyanide process unit. ess vents from continuous unit operations in the process by 98 weight- percent in accordance with paragraph (g)(4) of this section. Any control device used to reduce emissions from one or more process vents from continuous unit operations in the process unit must meet the applicable requirements specified in § 63.982(a)(2); or (ii) Reduce emissions of total HAP from each process vent from a continuous unit operation in the process unit by using a flare meeting the requirements specified in § 63.982(b); or

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TABLE 9 TO § 63.1103(G)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A CYANIDE CHEMICALS MANUFACTURING EXISTING OR NEW AFFECTED SOURCE?—Continued

If you own or operate . . . And if . . . Then you must . . .

(iii) Reduce emissions of total HAP from each process vent from a continuous unit operation in the process unit by 98 weight-percent or to a concentration of 20 parts per million by volume, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of § 63.982(c)(2) or (d). (c) One or more wet end process vents, ...... (i) Reduce overall annual emissions of as defined in paragraph (g)(2) of this total HAP from the collection of proc- section, in a sodium cyanide process ess vents from continuous unit oper- unit. ations in the process unit by 98 weight-percent in accordance with paragraph (g)(4) of this section. Any control device used to reduce emissions from one or more process vents from continuous unit operations in the process unit must meet the applicable requirements of § 63.982(a)(2); or (ii) Reduce emissions of total HAP from each wet-end process vent in the process unit by using a flare meeting the requirements of § 63.982(b); or (iii) Reduce emissions of total HAP from each wet-end process vent by 98 weight-percent, or to a concentration of 20 parts per million by volume, by venting emissions through a closed vent system and any combination of control devices meeting the requirements of § 63.982(c)(2) or (d). (d) One or more dry end process vents, ...... (i) Reduce overall annual emissions of as defined in paragraph (g)(2) of this sodium cyanide from the collection of section, in a sodium cyanide process process vents from continuous unit unit. operations in the process unit by 98 weight-percent in accordance with paragraph (g)(4) of this section. Any control device used to reduce emissions from one or more process vents from continuous unit operations in the process unit must meet the applicable requirements of § 63.982(a)(2); or (ii) Reduce emissions of sodium cyanide from each dry-end process vent in the process unit by 98 weight-percent by venting emissions through a closed vent system to any combination of control devices meeting the requirements of § 63.982(c)(2) or (d). (e) A transfer rack ...... (1) The transfer rack is used to load re- (i) Reduce emissions of hydrogen cya- fined hydrogen cyanide into tank nide by using a flare meeting the re- trucks and/or rail cars. quirements of § 63.982(b); or (ii) Reduce emissions of hydrogen cyanide by 98 weight-percent, or to a concentration of 20 parts per million by volume, whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements specified in § 63.982(c)(1), (c)(2), or (d). (f) A new cyanide chemicals manufac- (1) The process wastewater is from HCN (i) Achieve a combined removal and turing process unit that generates proc- purification, ammonia purification, or control of HAP from wastewater of 93 ess wastewater. flare blowdown. weight-percent. (g) A cyanide chemicals manufacturing (1) The maintenance wastewater con- (i) Comply with the requirements of process unit that generates mainte- tains hydrogen cyanide or acetonitrile. § 63.1106(b). nance wastewater.

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TABLE 9 TO § 63.1103(G)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A CYANIDE CHEMICALS MANUFACTURING EXISTING OR NEW AFFECTED SOURCE?—Continued

If you own or operate . . . And if . . . Then you must . . .

(h) An item of equipment listed in (1) The item of equipment meets the cri- (i) Comply with the requirements in § 63.1106(c)(1) that transports or con- teria specified in § 63.1106(c)(1) Table 35 of subpart G of this part. tains wastewater liquid streams from a through (3) and either (c)(4)(i) or (ii). cyanide chemicals manufacturing process unit. (i) Equipment, as defined under § 63.1101 (1) The equipment contains or contacts (i) Comply with either subpart TT or UU hydrogen cyanide and operates equal of this part, and paragraph (g)(5) of to or greater then 300 hours per year. this section, with the exception that open-ended lines that contain or contact hydrogen cyanide are exempt from any requirements to install a cap, plug, blind flange, or second valve to be capped.

(h) Spandex production applicability, section, is specified in paragraph (b) of definitions, and requirements—(1) Appli- § 63.1102. cability—(i) Affected source. For the (2) Definitions. Dry spinning means a spandex production (as defined in para- fiber-forming process where graph (h)(2) of this section) source cat- prepolymer is reacted with a chain-ex- egory, the affected source shall com- tender to generate polymer prior to prise all emission points listed in para- spinning; the polymer is dissolved in a graphs (h)(1)(i)(A) through (C) of this solvent and is extruded into a cell of section that are associated with a hot gases for fiber formation. spandex production process unit lo- Fiber spinning line means the group of cated at a major source, as defined in equipment and process vents associated section 112(a) of the Act. with spandex fiber spinning operations. (A) All process vents (as defined in The fiber spinning line includes the § 63.1101). blending and dissolving tanks, spinning (B) All storage vessels (as defined in solution filters, spinning units, spin § 63.1101) that store liquids containing bath tanks, and the equipment used organic HAP. downstream of the spin bath to wash, (C) All spandex fiber spinning lines draw, or dry on the wet belt the spun using a spinning solution having or- fiber. ganic HAP. Reaction spinning means a fiber-form- (ii) Exceptions. The emission points ing process where prepolymer is ex- listed in paragraphs (h)(1)(ii)(A) and (B) truded into a spin bath that contains a of this section are in the spandex pro- chain-extender; the chemical reaction duction source category but are not to make polymer occurs simulta- subject to the requirements of para- neously with extrusion/fiber formation. graph (h)(3) of this section. Spandex or spandex fiber means a (A) Equipment that is located within manufactured synthetic fiber in which a spandex production process unit that the fiber-forming substance is a long- is subject to this subpart but does not chain polymer comprised of at least 85 contain organic HAP. percent by mass of a segmented poly- (B) Vessels storing organic liquids urethane. that contain organic HAP as impurities. Spandex production means the produc- (C) Emission points listed in para- tion of synthetic spandex fibers. graphs (h)(1)(i)(A) through (C) of this Spandex production process unit means section that are associated with a dry a process unit that is specifically used spinning spandex production process for the production of synthetic spandex unit. fibers. (iii) Compliance schedule. The compli- (3) Requirements. Table 10 to this sec- ance schedule for affected sources, as tion specifies the spandex production defined in paragraph (h)(1)(i) of this source category requirements for new

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and existing sources. An owner or oper- sions from startup, shutdown, and mal- ator must perform the applicability as- functions must be addressed in the sessment procedures and methods for startup, shutdown, and malfunction process vents specified in § 63.1104, ex- plan required by § 63.1111; the plan must cluding paragraphs (b)(1), (d), (g), (h), also establish reporting and record- (i), (j), (l)(1), and (n). General compli- keeping of such events. Procedures for ance, recordkeeping, and reporting re- approval of alternate means of emis- quirements are specified in §§ 63.1108 sion limitations are specified in through 63.1112. Minimization of emis- § 63.1113.

TABLE 10 TO § 63.1103(H)—WHAT ARE MY REQUIREMENTS IF I OWN OR OPERATE A SPANDEX PRODUCTION PROCESS UNITATANEW OR EXISTING SOURCE?

If you own or operate . . . And if . . . Then you must . . .

(a) A storage vessel (as defined in (1) The maximum true vapor pressure of (i) Comply with the requirements of sub- § 63.1101) that stores liquid containing the organic HAP is ≥ 3.4 kilopascals; part WW of this part; or organic HAP. and the capacity of the vessel is ≥ 47 (ii) Reduce emissions of organic HAP by cubic meters. 95 weight-percent by venting emissions in through a closed vent system to any combination of control devices meeting the requirements of subpart SS of this part, as specified in § 63.982(a)(1). (b) A process vent ...... Reduce emissions of organic HAP by 95 weight-percent, or reduce organic HAP or TOC to a concentration of 20 parts per million by volume, whichever is less stringent, by venting emissions through a closed vent system to any combination of control devices meeting the requirements of § 63.982(a)(2). (c) A fiber spinning line ...... Operate the fiber spinning line such that emissions are captured and vented through a line closed vent system to a control device that complies with the requirements of § 63.982(a)(2). If a control device other than a flare is used, HAP emissions must be reduced by 95 weight-percent, or total organic HAP or TOC must be reduced to a concentration of 20 parts per million by volume, whichever is less stringent.

[64 FR 34921, June 29, 1999, as amended at 64 FR 63699, 63706, Nov. 22, 1999; 64 FR 71852, Dec. 22, 1999; 66 FR 55847, Nov. 2, 2001; 67 FR 39305, June 7, 2002; 67 FR 46281, July 12, 2002; 67 FR 46293, July 12, 2002; 70 FR 19272, Apr. 13, 2005]

§ 63.1104 Process vents from contin- weight-percent, TOC concentration, or uous unit operations: applicability organic HAP concentration require- assessment procedures and meth- ment in § 63.1103. ods. (b) Sampling sites. For purposes of de- (a) General. The provisions of this termining process vent applicability section provide calculation and meas- criteria, the sampling site shall be lo- urement methods for criteria that are cated as specified in (b)(1) through (4) required by § 63.1103 to be used to deter- of this section, as applicable. mine applicability of the control re- (1) Sampling site location if TRE deter- quirements for process vents from con- mination is required. If the applicability tinuous unit operations. The owner or criteria specified in the applicable operator of a process vent is not re- table of § 63.1103 includes a TRE index quired to determine the criteria speci- value, the sampling site for deter- fied for a process vent that is being mining volumetric flow rate, regulated controlled (including control by flare) in accordance with the applicable

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