Subpart 373-3: Interim Status Standards For Owners and Operators Of Hazardous Waste Facilities - Page 4

(Statutory Authority: Environmental Conservation Law Section 27-0900 et seq)

[Effective September 5, 2006]

[page 4 of 5]

Pages in this Part:
Sections 1 to Section 7
Sections 8 to Section 11
Sections 12 to Section 28
Section 29
Sections 30 to Appendix 55

§373-3.29 - Air Emission Standards for Tanks, Surface Impoundments and Containers

(a) Applicability.

(1) The requirements of this section apply to owners and operators of all facilities that treat, store, or dispose of hazardous waste in tanks, surface impoundments, or containers subject to either sections 373-3.9, 373-3.10 or 373-3.11 of this Subpart except as section 373-3.1 and paragraph (2) of this subdivision provide otherwise.

(2) The requirements of this section do not apply to the following waste management units at the facility:

(i) A waste management unit that holds hazardous waste placed in a unit before December 6, 1996, and in which no hazardous waste is added to the unit on or after December 6, 1996.

(ii) A container that has a design capacity less than or equal to 0.1 m³.

(iii) A tank in which an owner or operator has stopped adding hazardous waste and the owner or operator has begun implementing or completed closure pursuant to an approved closure plan.

(iv) A surface impoundment in which an owner or operator has stopped adding hazardous waste (except to implement an approved closure plan) and the owner or operator has begun implementing or completed closure pursuant to an approved closure plan.

(v) A waste management unit that is used solely for on-site treatment or storage of hazardous waste that is placed in the unit as a result of implementing remedial activities required under the corrective action authorities of RCRA sections 3004(u), 3004(v), or 3008(h); CERCLA authorities; or similar Federal or State authorities including, but not limited to, 6 NYCRR Parts 373 and 375, ECL 71-2727(3), and ECL Article 27 Titles 9 and 13.

(vi) A waste management unit that is used solely for the management of radioactive mixed waste in accordance with all applicable regulations under the authority of the Atomic Energy Act and the Nuclear Waste Policy Act.

(vii) A hazardous waste management unit that the owner or operator certifies is equipped with and operating air emission controls in accordance with the requirements of an applicable Clean Air Act regulation codified under 40 CFR part 60, part 61, or part 63 as incorporated by reference in subdivision 370.1(e) of this Title . For the purpose of complying with this paragraph, a tank for which the air emission control includes an enclosure, as opposed to a cover, must be in compliance with the enclosure and control device requirements of subparagraph 373-3.29(f)(9), except as provided in paragraph 373-3.29(d)(3)(v).

(viii) A tank that has a process vent as defined in subdivision 373-2.27(b) of this Title.

(3) For the owner and operator of a facility subject to this section who has received a final permit under Part 373 of this Title, prior to December 6, 1996, the following requirements apply:

(i) The requirements of 6 NYCRR Part 373-2.29 shall be incorporated into the permit when the permit is reissued in accordance with the requirements of Part 621 of this Title or reviewed in accordance with the requirements of section 373-1.8 of this Part.

(ii) Until the date when the permit is reissued in accordance with the requirements of Part 621 of this Title or reviewed in accordance with the requirements of section 373-1.8 of this Part, the owner and operator is subject to the requirements of this section.

(4) The requirements of this section, except for the recordkeeping requirements specified in paragraph 373-3.29(k)(9) of this section, are administratively stayed for a tank or a container used for the management of hazardous waste generated by organic peroxide manufacturing and its associated laboratory operations when the owner or operator of the unit meets all of the following conditions:

(i) The owner or operator identifies that the tank or container receives hazardous waste generated by an organic peroxide manufacturing process producing more than one functional family of organic peroxides or multiple organic peroxides within one functional family, that one or more of these organic peroxides could potentially undergo self-accelerating thermal decomposition at or below ambient temperatures, and that organic peroxides are the predominant products manufactured by the process. For the purpose of meeting the conditions of this paragraph, "organic peroxide" means an organic compound that contains the bivalent -O-O- structure and which may be considered to be a structural derivative of hydrogen peroxide where one or both of the hydrogen atoms has been replaced by an organic radical.

(ii) The owner or operator prepares documentation, in accordance with the requirements of paragraph 373-3.29(k)(9) of this section, explaining why an undue safety hazard would be created if air emission controls specified in subdivisions 373-3.29(f) through 373-3.29(i) of this section are installed and operated on the tanks and containers used at the facility to manage the hazardous waste generated by the organic peroxide manufacturing process or processes meeting the conditions of subparagraph (4)(i) of this subdivision.

(iii) The owner or operator notifies the commissioner in writing that hazardous waste generated by an organic peroxide manufacturing process or processes meeting the conditions of subparagraph (4)(i) of this subdivision are managed at the facility in tanks or containers meeting the conditions of subparagraph (4)(ii) of this subdivision. The notification shall state the name and address of the facility, and be signed and dated by an authorized representative of the facility owner or operator.

(b) Definitions. As used in this section, all terms not defined herein shall have the meaning given to them in Parts 370 through 374-1 of this Title.

(1) "Average volatile organic concentration" or "average VO concentration" means the mass-weighted average volatile organic concentration of a hazardous waste as determined in accordance with the requirements of subdivision 373-3.29(e) of this section.

(2 ) "Closure device" means a cap, hatch, lid, plug, seal, valve, or other type of fitting that blocks an opening in a cover such that when the device is secured in the closed position it prevents or reduces air pollutant emissions to the atmosphere. Closure devices include devices that are detachable from the cover (e.g., a sampling port cap), manually operated (e.g., a hinged access lid or hatch), or automatically operated (e.g., a spring-loaded pressure relief valve).

(3) "Continuous seal" means a seal that forms a continuous closure that completely covers the space between the edge of the floating roof and the wall of a tank. A continuous seal may be a vapor-mounted seal, liquid-mounted seal, or metallic shoe seal. A continuous seal may be constructed of fastened segments so as to form a continuous seal.

(4) " Cover" means a device that provides a continuous barrier over the hazardous waste managed in a unit to prevent or reduce air pollutant emissions to the atmosphere. A cover may have openings (such as access hatches, sampling ports, gauge wells) that are necessary for operation, inspection, maintenance, and repair of the unit on which the cover is used. A cover may be a separate piece of equipment which can be detached and removed from the unit or a cover may be formed by structural features permanently integrated into the design of the unit.

(5) " Enclosure" means a structure that surrounds a tank or container, captures organic vapors emitted from the tank or container, and vents the captured vapors through a closed-vent system to a control device.

(6) "External floating roof" means a pontoon-type or double-deck type cover that rests on the surface of the material managed in a tank with no fixed roof.

(7) " Fixed roof" means a cover that is mounted on a unit in a stationary position and does not move with fluctuations in the level of the material managed in the unit.

(8) "Floating membrane cover" means a cover consisting of a synthetic flexible membrane material that rests upon and is supported by the hazardous waste being managed in a surface impoundment.

(9) "Floating roof" means a cover consisting of a double-deck, pontoon single deck, or internal floating cover which rests upon and is supported by the material being contained, and is equipped with a continuous seal.

(10) " Hard-piping" means pipe or tubing that is manufactured and properly installed in accordance with relevant standards and good engineering practices.

(11) " In light material service" means the container is used to manage a material for which both of the following conditions apply: The vapor pressure of one or more of the organic constituents in the material is greater than 0.3 kilopascals (kPa) at 20^oC; and the total concentration of the pure organic constituents having a vapor pressure greater than 0.3 kPa at 20^oC is equal to or greater than 20 percent by weight.

(12) " Internal floating roof" means a cover that rests or floats on the material surface (but not necessarily in complete contact with it) inside a tank that has a fixed roof.

(13) "Liquid-mounted seal" means a foam or liquid-filled primary seal mounted in contact with the hazardous waste between the tank wall and the floating roof continuously around the circumference of the tank.

(14) "Malfunction" means any sudden, infrequent, and not reasonably preventable failure of air pollution control equipment, process equipment, or a process to operate in a normal or usual manner. Failures that are caused in part by poor maintenance or careless operation are not malfunctions.

(15) "Maximum organic vapor pressure" means the sum of the individual organic constituent partial pressures exerted by the material contained in a tank, at the maximum vapor pressure-causing conditions (i.e., temperature, agitation, pH effects of combining wastes, etc.) reasonably expected to occur in the tank. For the purpose of this section, maximum organic vapor pressure is determined using the procedures specified in paragraph 373-3.29(e)(3) of this section.

(16) "Metallic shoe seal" means a continuous seal that is constructed of metal sheets which are held vertically against the wall of the tank by springs, weighted levers, or other mechanisms and is connected to the floating roof by braces or other means. A flexible coated fabric (envelope) spans the annular space between the metal sheet and the floating roof.

(17) "No detectable organic emissions" means no escape of organics to the atmosphere as determined using the procedure specified in paragraph 373-3.29(e)(4) of this section.

(18) "Point of waste origination" means as follows:

(i) When the facility owner or operator is the generator of the hazardous waste, the point of waste origination means the point where a solid waste produced by a system, process, or waste management unit is determined to be a hazardous waste as defined in Part 371 of this Title.

(Note: In this case, this term is being used in a manner similar to the use of the term "point of generation" in air standards established for waste management operations under authority of the Clean Air Act in 40 CFR Parts 60, 61, and 63 (incorporated by reference in subdivision 370.1(e) of this Title)).

(ii) When the facility owner and operator are not the generator of the hazardous waste, point of waste origination means the point where the owner or operator accepts delivery or takes possession of the hazardous waste.

(19) "Point of waste treatment" means the point where a hazardous waste to be treated in accordance with subparagraph 373-3.29(d)(3)(ii) of this section exits the treatment process. Any waste determination shall be made before the waste is conveyed, handled, or otherwise managed in a manner that allows the waste to volatilize to the atmosphere.

(20) "Safety device" means a closure device such as a pressure relief valve, frangible disc, fusible plug, or any other type of device which functions exclusively to prevent physical damage or permanent deformation to a unit or its air emission control equipment by venting gases or vapors directly to the atmosphere during unsafe conditions resulting from an unplanned, accidental, or emergency event. For the purpose of this section, a safety device is not used for routine venting of gases or vapors from the vapor headspace underneath a cover such as during filling of the unit or to adjust the pressure in this vapor headspace in response to normal daily diurnal ambient temperature fluctuations. A safety device is designed to remain in a closed position during normal operations and open only when the internal pressure, or another relevant parameter, exceeds the device threshold setting applicable to the air emission control equipment as determined by the owner or operator based on manufacturer recommendations, applicable regulations, fire protection and prevention codes, standard engineering codes and practices, or other requirements for the safe handling of flammable, ignitable, explosive, reactive, or hazardous materials.

(21) "Single-seal system" means a floating roof having one continuous seal. This seal may be vapor-mounted, liquid-mounted, or a metallic shoe seal.

(22) "Vapor-mounted seal" means a continuous seal that is mounted such that there is a vapor space between the hazardous waste in the unit and the bottom of the seal.

(23) "Volatile organic concentration" or "VO concentration" means the fraction by weight of the volatile organic compounds contained in a hazardous waste expressed in terms of parts per million (ppmw) as determined by direct measurement or by knowledge of the waste in accordance with the requirements of subdivision 373-3.29(e) of this section. For the purpose of determining the VO concentration of a hazardous waste, organic compounds with a Henry's law constant value of at least 0.1 mole-fraction-in-the-gas-phase/mole-fraction-in the liquid-phase (0.1 Y/X) (which can also be expressed as 1.8 x 10^-6 atmospheres/gram-mole/m³) at 25 degrees Celsius must be included. A list of compounds known to have a Henry's law constant value less than the cutoff level can be found at Appendix VI to 40 CFR Part 265 as incorporated by reference in Appendix 55.

(24) "Waste determination" means performing all applicable procedures in accordance with the requirements of subdivision 373-3.29(e) of this section to determine whether a hazardous waste meets standards specified in this section. Examples of a waste determination include performing the procedures in accordance with the requirements of subdivision 373-3.29(e) of this section to determine the average VO concentration of a hazardous waste at the point of waste origination; the average VO concentration of a hazardous waste at the point of waste treatment and comparing the results to the exit concentration limit specified for the process used to treat the hazardous waste; the organic reduction efficiency and the organic biodegradation efficiency for a biological process used to treat a hazardous waste and comparing the results to the applicable standards; or the maximum volatile organic vapor pressure for a hazardous waste in a tank and comparing the results to the applicable standards.

(25) "Waste stabilization process" means any physical or chemical process used to either reduce the mobility of hazardous constituents in a hazardous waste or eliminate free liquids as determined by Test Method 9095 (Paint Filter Liquids Test) in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods," EPA Publication No. SW-846, as incorporated by reference in subdivision 370.1(e) of this Title. A waste stabilization process includes mixing the hazardous waste with binders or other materials, and curing the resulting hazardous waste and binder mixture. Other synonymous terms used to refer to this process are "waste fixation" or "waste solidification." This does not include the adding of absorbent materials to the surface of a waste, without mixing, agitation, or subsequent curing, to absorb free liquid.

(c) Schedule for implementation of air emission standards.

(1) Owners or operators of facilities existing on December 6, 1996, and subject to sections 373-3.9, 373-3.10, and 373-3.11 of this Subpart shall meet the following requirements:

(i) Install and begin operation of all control equipment or waste management units required to comply with this section and complete modifications of production or treatment processes to satisfy exemption criteria in accordance with paragraph 373-3.29(d)(3), except as provided for in subparagraph (1)(ii) of this subdivision.

(ii) When control equipment or waste management units required to comply with this section cannot be installed and in operation or modifications of production or treatment processes to satisfy exemption criteria in accordance with paragraph 373-3.29(d)(3) of this section cannot be completed by December 6, 1996, the owner or operator shall:

('a') Install and begin operation of the control equipment and waste management units, and complete modifications of production or treatment processes as soon as possible but no later than December 8, 1997.

('b') Prepare an implementation schedule that includes the following information: specific calendar dates for award of contracts or issuance of purchase orders for the control equipment, waste management units, and production or treatment process modifications; initiation of on-site installation of control equipment or waste management units and modifications of production or treatment processes; completion of control equipment or waste management unit installation, and production or treatment processes modifications; and performance of testing to demonstrate that the installed equipment or waste management units and modified production or treatment processes meet the applicable standards of this section.

('c') For facilities subject to the recordkeeping requirements of subdivision 373-3.5(c) of this Subpart, the owner or operator shall enter the implementation schedule specified in clause (1)(ii)('b') of this subdivision in the operating record no later than December 6, 1996.

('d') For facilities not subject to 373-3.5(c) of this Subpart, the owner or operator shall enter the implementation schedule specified in clause (1)(ii)('b') of this subdivision in a permanent, readily available file located at the facility no later than December 6, 1996.

(2) Owners or operators of facilities and units in existence on the effective date of statutory or regulatory amendment to this Title that renders the facility subject to sections 373-3.9, 373-3.10, or 373-3.11 of this Subpart shall meet the following requirements:

(i) Install and begin operation of control equipment required or waste management units required to comply with this section and complete modifications of production or treatment processes to satisfy exemption criteria of paragraph 373-3.29(d)(3) of this section by the effective date of the amendment except as provided for in subparagraph (2)(ii) of this subdivision.

(ii) When control equipment or waste management units required to comply with this section cannot be installed and begin operation, or when modifications of production or treatment processes to satisfy exemption criteria of paragraph 373-3.29(d)(3) of this section cannot be completed by the effective date of the amendment, the owner or operator shall:

('a') Install and begin operation of the control equipment or waste management unit and, complete modification of production or treatment processes as soon as possible but no later than 30 months after the effective date of the amendment.

('b') For facilities subject to the recordkeeping requirements of subdivision 373-3.5(c) of this Subpart, enter and maintain the implementation schedule specified in clause (1)(ii)('b') of this subdivision in the operating record no later than the effective date of the amendment, or

('c') For facilities not subject to subdivision 373-3.5(c) of this Subpart, the owner or operator shall enter and maintain the implementation schedule specified in clause (1)(ii)('b') of this subdivision in a permanent, readily available file located at the facility site no later than the effective date of the amendment.

(3) Owners and operators of facilities and units that become newly subject to the requirements of this section after December 8, 1997 due to an action other than those described in paragraph (2) of this subdivision must comply with all applicable requirements immediately (i.e., must have control devices installed and operating on the date the facility or unit becomes subject to this section; the 30-month implementation schedule does not apply.)

(4) The commissioner may elect to extend the implementation date for control equipment at a facility, on a case by case basis, to a date later than December 8, 1997, when special circumstances that are beyond the facility owner's or operator's control delay installation or operation of control equipment and the owner or operator has made all reasonable and prudent attempts to comply with the requirements of this section.

(d) Standards: General.

(1) This subdivision applies to the management of hazardous waste in tanks, surface impoundments, and containers subject to this section.

(2) The owner or operator shall control air pollutant emissions from each hazardous waste management unit in accordance with standards specified in subdivisions 373-3.29(f) through 373-3.29(i) of this section, as applicable to the hazardous waste management unit, except as provided for in paragraph (3) of this subdivision.

(3) A tank, surface impoundment, or container is exempt from standards specified in subdivisions 373-3.29(f) through 373-3.29(i) of this section, as applicable, provided that the waste management unit is one of the following:

(i) A tank, surface impoundment, or container for which all hazardous waste entering the unit has an average VO concentration at the point of waste origination of less than 500 parts per million by weight (ppmw). The average VO concentration shall be determined using the procedures specified in paragraph 373-3.29(e)(1) of this section. The owner or operator shall review and update, as necessary, this determination at least once every 12 months following the date of the initial determination for the hazardous waste streams entering the unit.

(ii) A tank, surface impoundment, or container for which the organic content of all the hazardous waste entering the waste management unit has been reduced by an organic destruction or removal process that achieves any one of the following conditions:

('a') A process that removes or destroys the organics contained in the hazardous waste to a level such that the average VO concentration of the hazardous waste at the point of waste treatment is less than the exit concentration limit (Ct) established for the process. The average VO concentration of the hazardous waste at the point of waste treatment and the exit concentration limit for the process shall be determined using the procedures specified in paragraph 373-3.29(e)(2) of this section.

('b') A process that removes or destroys the organics contained in the hazardous waste to a level such that the organic reduction efficiency (R) for the process is equal to or greater than 95 percent, and the average VO concentration of the hazardous waste at the point of waste treatment is less than 100 ppmw. The organic reduction efficiency for the process and the average VO concentration of the hazardous waste at the point of waste treatment shall be determined using the procedures specified in paragraph 373-3.29(e)(2) of this section.

('c') A process that removes or destroys the organics contained in the hazardous waste to a level such that the actual organic mass removal rate (MR) for the process is equal to or greater than the required organic mass removal rate (RMR) established for the process. The required organic mass removal rate and the actual organic mass removal rate for the process shall be determined using the procedures specified in paragraph 373-3.29(e)(2) of this section.

('d') A biological process that destroys or degrades the organics contained in the hazardous waste, such that either of the following conditions is met:

('1') The organic reduction efficiency (R) for the process is equal to or greater than 95 percent, and the organic biodegradation efficiency (R_bio ) for the process is equal to or greater than 95 percent. The organic reduction efficiency and the organic biodegradation efficiency for the process shall be determined using the procedures specified in paragraph 373-3.29(e)(2) of this section.

('2') The total actual organic mass biodegradation rate (_Mrbio ) for all hazardous waste treated by the process is equal to or greater than the required organic mass removal rate (RMR). The required organic mass removal rate and the actual organic mass biodegradation rate for the process shall be determined using the procedures specified in paragraph 373-3.29(e)(2) of this section.

('e') A process that removes or destroys the organics contained in the hazardous waste and meets all of the following conditions:

('1') From the point of waste origination through the point where the hazardous waste enters the treatment process, the hazardous waste is managed continuously in waste management units which use air emission controls in accordance with the standards specified in subdivisions 373-3.29(f) through 373-3.29(i) of this section, as applicable to the waste management unit.

('2') From the point of waste origination through the point where the hazardous waste enters the treatment process, any transfer of the hazardous waste is accomplished through continuous hard-piping or other closed system transfer that does not allow exposure of the waste to the atmosphere. The department considers a drain system that meets the requirements of 40 CFR part 63, Subpart RR--National Emission Standards for Individual Drain Systems, as incorporated by reference in subdivision 370.1(e) of this Title, to be a closed system.

('3') The average VO concentration of the hazardous waste at the point of waste treatment is less than the lowest average VO concentration at the point of waste origination determined for each of the individual waste streams entering the process or 500 ppmw, whichever value is lower. The average VO concentration of each individual waste stream at the point of waste origination shall be determined using the procedures specified in paragraph 373-3.29(e)(1) of this section. The average VO concentration of the hazardous waste at the point of waste treatment shall be determined using the procedures specified in paragraph 373-3.29(e)(2) of this section.

('f') A process that removes or destroys the organics contained in the hazardous waste to a level such that the organic reduction efficiency (R) for the process is equal to or greater than 95 percent and the owner or operator certifies that the average VO concentration at the point of waste origination for each of the individual waste streams entering the process is less than 10,000 ppmw. The organic reduction efficiency for the process and the average VO concentration of the hazardous waste at the point of waste origination shall be determined using the procedures specified in paragraphs 373-3.29(e)(2) and 373-3.29(e)(1) of this section, respectively.

('g') A hazardous waste incinerator for which the owner or operator has either:

('1') Been issued a final permit under Subpart 373-1 of this Title which implements the requirements of section 373-2.15 of this Title; or

('2') Has designed and operates the incinerator in accordance with the interim status requirements of section 373-3.15 this Subpart.

('h') A boiler or industrial furnace for which the owner or operator has either:

('1') Been issued a final permit under Subpart 373-1 of this Title which implements the requirements of section 374-1.8 of this Title; or

('2') Has designed and operates the boiler or industrial furnace in accordance with the interim status requirements of section 374-1.8 of this Title.

('i') For the purpose of determining the performance of an organic destruction or removal process in accordance with the conditions in each of clauses 373-3.29(d)(3)(ii)('a') through 373-3.29(d)(3)(ii)('f') of this subdivision, the owner or operator shall account for VO concentrations determined to be below the limit of detection of the analytical method by using the following VO concentration:

('1') If Method 25D in 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, is used for the analysis, one-half the blank value determined in the method at section 4.4 of Method 25D in 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, or a value of 25 ppmw, whichever is less.

('2') If any other analytical method is used, one-half the sum of the limits of detection established for each organic constituent in the waste that has a Henry's law constant value at least 0.1 mole-fraction-in-the-gas-phase/mole-fraction-in-the-liquid-phase (0.1 Y/X) (which can also be expressed as 1.8 x 10-6 atmospheres/gram-mole/m3) at 25 degrees Celsius.

(iii) A tank or surface impoundment used for biological treatment of hazardous waste in accordance with the requirements of clause 373-3.29(d)(3)(ii)('d') of this subdivision.

(iv) A tank, surface impoundment, or container for which all hazardous waste placed in the unit either:

('a') Meets the numerical concentration limits for organic hazardous constituents, applicable to the hazardous waste, as specified in Part 376 of this Title,--Land Disposal Restrictions under Table "Treatment Standards for Hazardous Waste" in section 376.4 of this Title; or

('b') The organic hazardous constituents in the waste have been treated by the treatment technology established by the Department for the waste in paragraph 376.4(c)(1) of this Title, or have been removed or destroyed by an equivalent method of treatment approved by the US EPA and the Department pursuant to paragraph 376.4(c)(2) of this Title.

(v) A tank used for bulk feed of hazardous waste to a waste incinerator and all of the following conditions are met:

('a') The tank is located inside an enclosure vented to a control device that is designed and operated in accordance with all applicable requirements specified under 40 CFR part 61, Subpart FF--National Emission Standards for Benzene Waste Operations, as incorporated by reference in subdivision 370.1(e) of this Title, for a facility at which the total annual benzene quantity from the facility waste is equal to or greater than 10 megagrams per year;

('b') The enclosure and control device serving the tank were installed and began operation prior to November 25, 1996; and

('c') The enclosure is designed and operated in accordance with the criteria for a permanent total enclosure as specified in "Procedure T--Criteria for and Verification of a Permanent or Temporary Total Enclosure" under 40 CFR 52.741, Appendix B, as incorporated by reference in subdivision 370.1(e) of this Title. The enclosure may have permanent or temporary openings to allow worker access; passage of material into or out of the enclosure by conveyor, vehicles, or other mechanical or electrical equipment; or to direct air flow into the enclosure. The owner or operator shall perform the verification procedure for the enclosure as specified in Section 5.0 to "Procedure T--Criteria for and Verification of a Permanent or Temporary Total Enclosure" annually.

(4) The commissioner may at any time perform or request that the owner or operator perform a waste determination for a hazardous waste managed in a tank, surface impoundment, or container exempted from using air emission controls under the provisions of this section as follows:

(i) The waste determination for average VO concentration of a hazardous waste at the point of waste origination shall be performed using direct measurement in accordance with the applicable requirements of paragraph 373-3.29(e)(1) of this section. The waste determination for a hazardous waste at the point of waste treatment shall be performed in accordance with the applicable requirements of paragraph 373-3.29(e)(2) of this section.

(ii) In performing a waste determination pursuant to subparagraph 373-3.29(d)(4)(i) of this subdivision, the sample preparation and analysis shall be conducted as follows:

('a') In accordance with the method used by the owner or operator to perform the waste analysis, except in the case specified in clause 373-3.29(d)(4)(ii)('b') of this subdivision.

('b') If the commissioner determines that the method used by the owner or operator was not appropriate for the hazardous waste managed in the tank, surface impoundment, or container, then the commissioner may choose an appropriate method.

(iii) In a case when the owner or operator is requested to perform the waste determination, the commissioner may elect to have an authorized representative observe the collection of the hazardous waste samples used for the analysis.

(iv) In a case when the results of the waste determination performed or requested by the commissioner do not agree with the results of a waste determination performed by the owner or operator using knowledge of the waste, then the results of the waste determination performed in accordance with the requirements of subparagraph (4)(i) of this subdivision shall be used to establish compliance with the requirements of this section.

(v) In a case when the owner or operator has used an averaging period greater than 1 hour for determining the average VO concentration of a hazardous waste at the point of waste origination, the commissioner may elect to establish compliance with this section by performing or requesting that the owner or operator perform a waste determination using direct measurement based on waste samples collected within a 1-hour period as follows:

('a') The average VO concentration of the hazardous waste at the point of waste origination shall be determined by direct measurement in accordance with the requirements of paragraph 373-3.29(e)(1) of this section.

('b') Results of the waste determination performed or requested by the commissioner showing that the average VO concentration of the hazardous waste at the point of waste origination is equal to or greater than 500 ppmw shall constitute noncompliance with this section except in a case as provided for in clause (4)(v)('c') of this subdivision.

('c') For the case when the average VO concentration of the hazardous waste at the point of waste origination previously has been determined by the owner or operator using an averaging period greater than 1 hour to be less than 500 ppmw but because of normal operating process variations the VO concentration of the hazardous waste determined by direct measurement for any given 1-hour period may be equal to or greater than 500 ppmw, information that was used by the owner or operator to determine the average VO concentration of the hazardous waste (e.g., test results, measurements, calculations, and other documentation) and recorded in the facility records in accordance with the requirements of paragraph 373-3.29(e)(1) and subdivision 373-3.29(k) of this section shall be considered by the commissioner together with the results of the waste determination performed or requested by the commissioner in establishing compliance with this section.

(e) Waste determination procedures.

(1) Waste determination procedure to determine average volatile organic (VO) concentration of a hazardous waste at the point of waste origination.

(i) An owner or operator shall determine the average VO concentration at the point of waste origination for each hazardous waste placed in a waste management unit exempted under the provisions of subparagraph 373-3.29(d)(3)(i) of this section from using air emission controls in accordance with standards specified in subdivisions 373-3.29(f) through 373-3.29(i) of this section, as applicable to the waste management unit.

('a') An initial determination of the average VO concentration of the waste stream shall be made before the first time any portion of the material in the hazardous waste stream is placed in a waste management unit exempted under the provisions of subparagraph 373-3.29(d)(3)(i) of this section from using air emission controls, and thereafter an initial determination of the average VO concentration of the waste stream shall be made for each averaging period that a hazardous waste is managed in the unit; and

('b') Perform a new waste determination whenever changes to the source generating the waste stream are reasonably likely to cause the average VO concentration of the hazardous waste to increase to a level that is equal to or greater than the VO concentration limit specified in subparagraph 373-3.29(d)(3)(i) of this section.

(ii) For a waste determination that is required by subparagraph 373-3.29(e)(1)(i) of this subdivision, the average VO concentration of a hazardous waste at the point of waste origination shall be determined using either direct measurement as specified in subparagraph (1)(iii) of this subdivision or by knowledge as specified in subparagraph (1)(iv) of this subdivision.

(iii) Direct measurement to determine average VO concentration of a hazardous waste at the point of waste origination.

('a') Identification. The owner or operator shall identify and record the point of waste origination for the hazardous waste.

('b') Sampling. Samples of the hazardous waste stream shall be collected at the point of waste origination in manner such that volatilization of organics contained in the waste and in the subsequent sample is minimized and an adequately representative sample is collected and maintained for analysis by the selected method.

('1') The averaging period to be used for determining the average VO concentration for the hazardous waste stream on a mass-weighted average basis shall be designated and recorded. The averaging period can represent any time interval that the owner or operator determines is appropriate for the hazardous waste stream but shall not exceed one year.

('2') A sufficient number of samples, but no less than four samples, and analyzed for a hazardous waste determination. All of the samples for a given waste determination shall be collected within a one-hour period. The average of the four or more sample results constitutes a waste determination for the waste stream. One or more waste determinations may be required to represent the complete range of waste compositions and quantities that occur during the entire averaging period due to normal variations in the operating conditions for the source or process generating the hazardous waste stream. Examples of such normal variations are seasonal variations in waste quantity or fluctuations in ambient temperature.

('3') All samples shall be collected and handled in accordance with written procedures prepared by the owner or operator and documented in a site sampling plan. This plan shall describe the procedure by which representative samples of the hazardous waste stream are collected such that a minimum loss of organics occurs throughout the sample collection and handling process, and by which sample integrity is maintained. A copy of the written sampling plan shall be maintained on-site in the facility operating records. An example of an acceptable sampling plan includes a plan incorporating sample collection and handling procedures in accordance with the requirements specified in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods," EPA Publication SW-846, as incorporated by reference in subdivision 370.1(e) of this Title, or in Method 25D in 40 CFR part 60, appendix A as incorporated by reference in subdivision 370.1(e) of this Title.

('4') Sufficient information, as specified in the "site-sampling plan" required under subclause (1)(iii)('b')('3') of this subdivision, shall be prepared and recorded to document the waste quantity represented by the samples and, as applicable, the operating conditions for the source or process generating the hazardous waste represented by the samples.

('c') Analysis. Each collected sample shall be prepared and analyzed, in accordance with one or more of the methods listed in subclause 373-3.29(e)(1)(iii)('c')('1') through 373-3.29(e)(1)(iii)('c')('9') of this subdivision, including appropriate quality assurance and quality control (QA/QC) checks and use of target compounds for calibration. If method 25D in 40 CFR Part 60, Appendix A as incorporated by reference in subdivision 370.1(e) of this Title, is not used, then one or more methods should be chosen that are appropriate to ensure that the waste determination accounts for and reflects all organic compounds in the waste with Henry's Law constant values at least 0.1mole-fraction-in-the-gas-phase/mole-fraction-in-the-liquid-phase (0.1y/x) (which can also be expressed as 1.8 x 10^-6 atmospheres/gram-mole/m³) at 25 degrees Celsius. Each of the analytical methods listed in subclause 373-3.29(e)(1)(iii)('c')('2') through 373-3.29(e)(1)(iii)('c')('7') of this subdivision has an associated list of approved chemical compounds, for which the Department considers the methods appropriate for measurement. If an owner or operator uses EPA Method 624, 625, 1624, or 1625 in 40 CFR Part 136 Appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, to analyze one or more compounds that are not on that method's published list, the Alternative Test Procedure contained in 40 CFR part 136.4 and 136.5, as incorporated by reference in subdivision 370.1(e), must be followed. If an owner or operator uses EPA Method 8260 or 8270 in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, EPA publication SW-846, ( as incorporated by reference in subdivision 370.1(e) of this Title) to analyze one or more compounds that are not on that method's published list, the procedures in subclause (1)(iii)('c')('8') of this subdivision must be followed. At the owner's or operator's discretion, the owner or operator may adjust test data measured by a method other than Method 25D to the corresponding average VO concentration value which would have been obtained had the waste samples been analyzed using Method 25D in 40 CFR Part 60, Appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. To adjust these data, the measured concentration of each individual chemical constituent contained in the waste is multiplied by the appropriate constituent-specific adjustment factor (f_m25D ). If the owner or operator elects to adjust test data, the adjustment must be made to all individual chemical constituents with a Henry's law constant value greater than or equal to 0.1Y/X at 25 degrees Celsius contained in the waste. Constituent-specific adjustment factors (f_m25D ) can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711.

('1') Method 25D in 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('2') Method 624 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('3') Method 625 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. Perform corrections to the compounds for which the analysis is being conducted based on the "accuracy as recovery" using the factors in Table 7 of the method.

('4') Method 1624 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('5') Method 1625 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('6') Method 8260 in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods", EPA Publication SW-846, (as incorporated by reference in subdivision 370.1(e) of this Title). Maintain a formal quality assurance program consistent with the requirements of Method 8260. The quality assurance program shall include the following elements:

('i') Documentation of site-specific procedures to minimize the loss of compounds due to volatilization, biodegradation, reaction, or sorption during the sample collection, storage, preparation, introduction, and analysis steps.

('ii') Measurement of the overall accuracy and precision of the specific procedures.

('7') Method 8270 in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods", EPA Publication SW-846, (as incorporated by reference in subdivision 370.1(e) of this Title). Maintain a formal quality assurance program consistent with the requirements of Method 8270. The quality assurance program shall include the following elements:

('ii') Measurement of the overall accuracy and precision of the specific procedures.

('8') Any other EPA standard method that has been validated in accordance with "Alternative Validation Procedure for EPA Waste and Wastewater Methods", 40 CFR part 63, appendix D, as incorporated by reference in subdivision 370.1(e) of this Title. As an alternative, other EPA standard methods may be validated by the procedure specified in subclause (1)(iii)('c')('9') of this subdivision.

('9') Any other analysis method that has been validated in accordance with the procedures specified in Section 5.1 or Section 5.3, and the corresponding calculations in Section 6.1 or Section 6.3, of Method 301 in 40 CFR part 63, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. The data are acceptable if they meet the criteria specified in Section 6.1.5 or Section 6.3.3 of Method 301. If correction is required under section 6.3.3 of Method 301, the data are acceptable if the correction factor is within the range 0.7 to 1.30. Other sections of Method 301 are not required. ('d') Calculations. ('1') The average VO concentration ( ) on a mass-weighted basis shall be calculated by using the results for all waste determinations conducted in accordance with clauses (1)(iii)('b') and ('c') of this subdivision and the following equation:

Where:

= Average VO concentration of the hazardous waste at the point of waste origination on a mass-weighted basis, ppmw.

i = Individual waste determination "i" of the hazardous waste.

n = Total number of waste determinations of the hazardous waste conducted for the averaging period (not to exceed 1 year).

Q_i = Mass quantity of hazardous waste stream represented by C_i , kg/hr.

Q_T = Total mass quantity of hazardous waste during the averaging period, kg/hr.

C_i = Measured VO concentration of waste determination "i" as determined in accordance with the requirements of clause 373-3.29(e)(1)(iii)('c') of this subdivision, (i.e., the average of the four or more samples specified in subclause 373-3.29(e)(1)(iii)('b')('2') of this subdivision), ppmw.

('2') For the purpose of determining C _i, for individual waste samples analyzed in accordance with clause 373-3.29(e)(1)(iii)('c') of this subdivision, the owner or operator shall account for VO concentrations determined to be below the limit of detection of the analytical method by using the following VO concentration:

('i') If Method 25D in 40 CFR part 60, Appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, is used for the analysis, one-half the blank value determined in the method at section 4.4 of Method 25D in 40 CFR part 60, Appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('ii') If any other analytical method is used, one-half the sum of the limits of detection established for each organic constituent in the waste that has a Henry's law constant values at least 0.1 mole-fraction-in-the-gas-phase/mole-fraction-in-the-liquid-phase (0.1Y/X) (which can be expressed as 1.8 x 10-6 atmospheres/gram-mole/m3) at 25 degrees Celsius.

('e') Provided that the test method is appropriate for the waste as required under clause 373-3.29(e)(1)(iii)('c') of this subdivision, the Department will determine compliance based on the test method used by the owner or operator as recorded pursuant to subparagraph 373-3.29(k)(6)(i) of this section.

(iv) Use of owner or operator knowledge to determine average VO concentration of a hazardous waste at the point of waste origination.

('a') Documentation shall be prepared that presents the information used as the basis for the owner's or operator's knowledge of the hazardous waste stream's average VO concentration. Examples of information that may be used as the basis for knowledge include: Material balances for the source or process generating the hazardous waste stream; constituent-specific chemical test data for the hazardous waste stream from previous testing that are still applicable to the current waste stream; previous test data for other locations managing the same type of waste stream; or other knowledge based on information included in manifests, shipping papers, or waste certification notices.

('b') If test data are used as the basis for knowledge, then the owner or operator shall document the test method, sampling protocol, and the means by which sampling variability and analytical variability are accounted for in the determination of the average VO concentration. For example, an owner or operator may use organic concentration test data for the hazardous waste stream that are validated in accordance with Method 301 in 40 CFR part 63, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, as the basis for knowledge of the waste.

('c') An owner or operator using chemical constituent-specific concentration test data as the basis for knowledge of the hazardous waste may adjust the test data to the corresponding average VO concentration value which would have been obtained had the waste samples been analyzed using Method 25D in 40 CFR part 60, appendix A as incorporated by reference in subdivision 370.1(e) of this Title. To adjust these data, the measured concentration for each individual chemical constituent contained in the waste is multiplied by the appropriate constituent-specific adjustment factor (f_m25D ).

('d') In the event that the commissioner and the owner or operator disagree on a determination of the average VO concentration for a hazardous waste stream using knowledge, then the results from a determination of average VO concentration using direct measurement as specified in subparagraph (1)(iii) of this subdivision shall be used to establish compliance with the applicable requirements of this section. The commissioner may perform or request that the owner or operator perform this determination using direct measurement The owner or operator may choose one or more appropriate methods to analyze each collected sample in accordance with the requirements of clause 373-3.29(e)(1)(iii)('c') of this subdivision.

(2) Waste determination procedures for treated hazardous waste.

(i) An owner or operator shall perform the applicable waste determination for each treated hazardous waste placed in a waste management unit exempted under the provisions of clauses 373-3.29(d)(3)(ii)('a') through 373-3.29(d)(3)(ii)('f') of this section from using air emission controls in accordance with standards specified in subdivisions 373-3.29(f) through 373-3.29(i) of this section, as applicable to the waste management unit.

('a') An initial determination of the average VO concentration of the waste stream shall be made before the first time any portion of the material in the treated waste stream is placed in a waste management unit exempted under the provisions of subparagraphs 373-3.29(d)(3)(ii), 373-3.29(d)(3)(iii), or 373-3.29(d)(3)(iv) of this section from using air emission controls, and thereafter update the information used for the waste determination at least once every 12 months following the date of the initial waste determination; and

('b') Perform a new waste determination whenever changes to the process generating or treating the waste stream are reasonably likely to cause the average VO concentration of the hazardous waste to increase to a level such that the applicable treatment conditions specified in subparagraphs is 373-3.29(d)(3)(ii), 373-3.29(d)(3)(iii), or 373-3.29(d)(3)(iv) of this section are not achieved.

(ii) The owner or operator shall designate and record the specific provision in subparagraph 373-3.29 (d)(3)(ii) of this section under which the waste determination is being performed. The waste determination for the treated hazardous waste shall be performed using the applicable procedures specified in applicable subparagraphs (2)(iii) through (2)(ix) of this subdivision.

(iii) Procedure to determine the average VO concentration of a hazardous waste at the point of waste treatment.

('a') Identification. The owner or operator shall identify and record the point of waste treatment for the hazardous waste.

('b') Sampling. Samples of the hazardous waste stream shall be collected at the point of waste treatment in a manner such that volatilization of organics contained in the waste and in the subsequent sample is minimized and an adequately representative sample is collected and maintained for analysis by the selected method.

('1') The averaging period to be used for determining average VO concentration for the hazardous waste stream on a mass-weighted average basis shall be designated and recorded. The averaging period can represent any time interval that the owner or operator determines is appropriate for the hazardous waste stream but shall not exceed one year.

('2') A sufficient number of samples, but no less than four samples, shall be collected and analyzed for a hazardous waste determination. All of the samples for a given waste determination shall be collected within a one-hour period. The average of the four or more sample results constitutes a waste determination for the waste stream. One or more waste determinations may be required to represent the complete range of waste compositions and quantities that occur during the entire averaging period due to normal variations in the operating conditions for the process generating or treating the hazardous waste stream. Examples of such normal variations are seasonal variations in waste quantity or fluctuations in ambient temperature.

('3') All samples shall be collected and handled in accordance with written procedures prepared by the owner or operator and documented in a site sampling plan. This plan shall describe the procedure by which representative samples of the hazardous waste stream are collected such that a minimum loss of organics occurs throughout the sample collection and handling process, and by which sample integrity is maintained. A copy of the written sampling plan shall be maintained on-site in the facility operating records. An example of an acceptable sampling plan includes a plan incorporating sample collection and handling procedures in accordance with the requirements specified in " Test Methods for Evaluating Solid Waste, Physical/Chemical Methods," EPA Publication No. SW-846, as incorporated by reference in subdivision 370.1(e) of this Title, or in Method 25D in 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('4') Sufficient information, as specified in the "site sampling plan" required under subclause ('3') of clause (2)(iii)('b') of this subdivision, 373-3.29(e)(2)(iii)('b'), shall be prepared and recorded to document the waste quantity represented by the samples and, as applicable, the operating conditions for the process treating the hazardous waste represented by the samples.

('c') Analysis. Each collected sample shall be prepared and analyzed in accordance with one or more of the methods listed in subclauses (2)(iii)('c')('1') through (2)(iii)('c')('9') of this subdivision, including appropriate quality assurance and quality control (QA/QC) checks and use of target compounds for calibration. When the owner or operator is making a waste determination for a treated hazardous waste that is to be compared to an average VO concentration at the point of waste origination or the point of waste entry to the treatment system, to determine if the conditions of clauses 373-2.29(c)(3)(ii)('a') through (3)(ii)('f') of this Part, or 373-3.29(d)(3)(ii)('a') through (3)(ii)('f') of this section are met, then the waste samples shall be prepared and analyzed using the same method or methods as were used in making the initial waste determinations at the point of waste origination or at the point of entry to the treatment system. If Method 25D in 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, is not used, then one or more of the methods should be chosen that are appropriate to ensure that the waste determination accounts for and reflects all organic compounds in the waste with Henry's law constant values at least 0.1mole-fraction-in-the-gas-phase/mole-fraction-in-the-liquid-phase (0.1Y/X) ( which can also be expressed as 1.8 x 10^-6 atmospheres/gram-mole/m³) at 25 degrees Celsius. Each of the analytical methods listed in subclauses (2)(iii)('c')('2') through (2)(iii)('c')('7') of this subdivision has an associated list of approved chemical compounds, for which the department considers the method appropriate for measurement. If an owner or operator uses EPA Method 624, 625, 1624, or 1625 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, to analyze one or more compounds that are not on that method's published list, the Alternative Test Procedure contained in 40 CFR 136.4 and 136.5 must be followed. If an owner or operator uses EPA Method 8260 or 8270 in "Test Methods for Evaluating Solid Waste, Physical/ Chemical Methods", EPA Publication SW-846, as incorporated by reference in subdivision 370.1(e) of this Title to analyze one or more compounds that are not on that method's published list, the procedures in subclause (2)(iii)('c')('8') of this subdivision must be followed. At the owner's or operator's discretion, the owner or operator may adjust test data measured by a method other than Method 25D, to the corresponding average VO concentration value which would have been obtained had the waste samples been analyzed using Method 25D in 40 CFR, Part 60, Appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. To adjust these data, the measured concentration of each individual chemical constituent contained in the waste is multiplied by the appropriate constituent-specific adjustment factor (f_m25D ). If the owner or operator elects to adjust test data, the adjustment must be made to all individual chemical constituents with a Henry's law constant equal to or greater than 0.1Y/X at 25 degrees Celsius contained in the waste. Constituent-specific adjustment factors (f_m25D ) can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711.

('1') Method 25D in 40 CFR part 60 appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('2') Method 624 in 40 CFR part 136 appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('4') Method 1624 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('5') Method 1625 in 40 CFR part 136, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('6') Method 8260 in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods", EPA Publication SW-846, as incorporated by reference in subdivision 370.1(e) of this Title. Maintain a formal quality assurance program consistent with the requirements of method 8260. The quality assurance program shall include the following elements:

('ii') Measurement of the overall accuracy and precision of the specific procedures.

('7') Method 8270 in "Test Method for Evaluating Solid Waste, Physical/Chemical Methods", EPA Publication SW-846, as incorporated by reference in subdivision 370.1(e) of this Title. Maintain a formal quality assurance program consistent with the requirements of method 8270. The quality assurance program shall include the following elements:

('ii') Measurement of the overall accuracy and precision of the specific procedures.

('8') Any other EPA standard method that has been validated in accordance with "Alternative Validation Procedures for EPA Waste and Wastewater Methods", 40 CFR part 63, appendix D, as incorporated by reference in subdivision 370.1(e) of this Title. As an alternative, other EPA standard methods may be validated by the procedure specified in subclause (2)(iii)('c')('9') of this subdivision.

('d') Calculations. The average VO concentration () on a mass-weighted basis shall be calculated by using the results for all waste determinations conducted in accordance with clauses 373-3.29(e)(2)(iii)('b') and (2)(iii)('c') of this subdivision and the following equation:

Where:

Average VO concentration of the hazardous waste at the point of waste treatment on a mass-weighted basis, ppmw.

i = Individual waste determination "i" of the hazardous waste.

n = Total number of waste determinations of the hazardous waste conducted for the averaging period (not to exceed 1 year).

Q_i = Mass quantity of hazardous waste stream represented by C_i , kg/hr.

Q_T = Total mass quantity of hazardous waste during the averaging period, kg/hr.

C_i = Measured VO concentration of waste determination "i" as determined in accordance with the requirements of clause ('c') of this subparagraph (i.e., the average of the four or more samples specified in subclause 373-3.29(e)(2)(iii)('b')('2') of this section), ppmw.

('e') Provided that the test method is appropriate for the waste as required under clause 373-3.29(e)(2)(iii)('c') of this subdivision, compliance shall be determined based on the test method used by the owner or operator as recorded pursuant to 373-3.29(k)(6)(i) of this section.

(iv) Procedure to determine the exit concentration limit (C_t ) for a treated hazardous waste.

('a') The point of waste origination for each hazardous waste treated by the process at the same time shall be identified.

('b') If a single hazardous waste stream is identified in clause (2)(iv)('a') of this subdivision, then the exit concentration limit (C_t ) shall be 500 ppmw.

('c') If more than one hazardous waste stream is identified in clause (2)(iv)('a') of this subdivision, then the average VO concentration of each hazardous waste stream at the point of waste origination shall be determined in accordance with the requirements of paragraph (1) of this subdivision. The exit concentration limit (C_t ) shall be calculated by using the results determined for each individual hazardous waste stream and the following equation:

Where:

C_t = Exit concentration limit for treated hazardous waste, ppmw.

x = Individual hazardous waste stream "x" that has an average VO concentration less than 500 ppmw at the point of waste origination as determined in accordance with the requirements of paragraph 373-3.29(e)(1) of this section.

y = Individual hazardous waste stream "y" that has an average VO concentration equal to or greater than 500 ppmw at the point of waste origination as determined in accordance with the requirements of paragraph 373-3.29(e)(1) of this section.

m = Total number of "x" hazardous waste streams treated by process.

n = Total number of "y" hazardous waste streams treated by process.

Q_x = Annual mass quantity of hazardous waste stream "x," kg/yr.

Q_y = Annual mass quantity of hazardous waste stream "y," kg/yr.

C_x = Average VO concentration of hazardous waste stream "x" at the point of waste origination as determined in accordance with the requirements of paragraph 373-3.29(e)(1) of this section, ppmw.

(v) Procedure to determine the organic reduction efficiency (R) for a treated hazardous waste.

('a') The organic reduction efficiency (R) for a treatment process shall be determined based on results for a minimum of three consecutive runs.

('b') All hazardous waste streams entering the treatment process and all hazardous waste streams exiting the treatment process shall be identified. The owner or operator shall prepare a sampling plan for measuring these streams that accurately reflects the retention time of the hazardous waste in the process.

('c') For each run, information shall be determined for each hazardous waste stream identified in clause (2)(v)('b') of this subdivision using following procedures:

('1') The mass quantity of each hazardous waste stream entering the process (Q_b ) and the mass quantity of each hazardous waste stream exiting the process (Q_a ) shall be determined.

('2') The average VO concentration at the point of waste origination of each hazardous waste stream entering the process ( _b ) during the run shall be determined in accordance with the requirements of subparagraph (1)(iii) of this subdivision. The average VO concentration at the point of waste treatment of each waste stream exiting the process ( _a ) during the run shall be determined in accordance with the requirements of subparagraph (2)(iii) of this subdivision.

('d') The waste volatile organic mass flow entering the process (E_b ) and the waste volatile organic mass flow exiting the process (E_a ) shall be calculated by using the results determined in accordance with clause (2)(v)('c') of this subdivision and the following equations:

Where:

E_a = Waste volatile organic mass flow exiting process, kg/hr.

E_b = Waste volatile organic mass flow entering process, kg/hr.

m = Total number of runs (at least 3)

j = Individual run "j"

Q_b = Mass quantity of hazardous waste entering process during run "j," kg/hr.

Q_a = Average mass quantity of hazardous waste exiting process during run "j," kg/hr. _a = Average VO concentration of hazardous waste exiting process during run "j" as determined in accordance with the requirements of subparagraph 373-3.29(e)(2)(iii) of this section, ppmw.

OVERLINE C _b = Average VO concentration of hazardous waste entering process during run "j" as determined in accordance with the requirements of subparagraph 373-3.29(e)(1)(iii) of this section, ppmw.

('e') The organic reduction efficiency of the process shall be calculated by using the results determined in accordance with clause (2)(v)('d') of this subdivision and the following equation:

R =	E_b-E_a	x	100%
	E_b

Where:

R = Organic reduction efficiency, percent.

E_b = Waste volatile organic mass flow entering process as determined in accordance with the requirements of clause (2)(v)('d') of this subdivision, kg/hr.

E_a = Waste volatile organic mass flow exiting process as determined in accordance with the requirements of clause (2)(v)('d') of this subdivision of this section, kg/hr.

(vi) Procedure to determine the organic biodegradation efficiency (R_bio ) for a treated hazardous waste.

('a') The fraction of organics biodegraded (F_bio ) shall be determined using the procedure specified in 40 CFR part 63, appendix C, as incorporated by reference in subdivision 370.1(e) of this Title.

('b') The (R_bio ) shall be calculated by using the following equation:

R_bio =F_biox 100%

Where:

R_bio = Organic biodegradation efficiency, percent.

F_bio = Fraction of organic biodegraded as determined in accordance with the requirements of clause (2)(vi)('a') of this subdivision.

(vii) Procedure to determine the required organic mass removal rate (RMR) for a treated hazardous waste.

('a') All of the hazardous waste streams entering the treatment process shall be identified.

('b') The average VO concentration of each hazardous waste stream at the point of waste origination shall be determined in accordance with the requirements of paragraph (1) of this subdivision.

('c') For each individual hazardous waste stream that has an average VO concentration equal to or greater than 500 ppmw at the point of waste origination, the average volumetric flow rate and the density of the hazardous waste stream at the point of waste origination shall be determined.

('d') The RMR shall be calculated by using the average VO concentration, average volumetric flow rate, and density determined for each individual hazardous waste stream, and the following equation:

Where:

RMR = Required organic mass removal rate, kg/hr.

n = Total number of "y" hazardous waste streams treated by process.

V_y = Average volumetric flow rate of hazardous waste stream "y" at the point of waste origination, m³/hr.

k_y = Density of hazardous waste stream "y," kg/m³

_y = Average VO concentration of hazardous waste stream "y" at the point of waste origination as determined in accordance with the requirements of paragraph 373-3.29(e)(1) of this section, ppmw.

(viii) Procedure to determine the actual organic mass removal rate (MR) for a treated hazardous waste.

('a') The MR shall be determined based on results for a minimum of three consecutive runs. The sampling time for each run shall be 1 hour.

('b') The waste volatile organic mass flow entering the process (E_b ) and the waste volatile organic mass flow exiting the process (E_a ) shall be determined in accordance with the requirements of clause (2)(v)('d') of this subdivision.

('c') The MR shall be calculated by using the mass flow rate determined in accordance with the requirements of clause (2)(viii)('b') of this subdivision and the following equation:

MR = E_b- E_a

Where:

MR = Actual organic mass removal rate, kg/hr.

E_b = Waste volatile organic mass flow entering process as determined in accordance with the requirements of clause (2)(v)('d') of this subdivision, kg/hr.

E_a = Waste volatile organic mass flow exiting process as determined in accordance with the requirements of clause (2)(v)('d') of this subdivision, kg/hr.

(ix) Procedure to determine the actual organic mass biodegradation rate (_Mrbio ) for a treated hazardous waste.

('a') The _Mrbio shall be determined based on results for a minimum of three consecutive runs. The sampling time for each run shall be 1 hour.

('b') The waste organic mass flow entering the process (E_b ) shall be determined in accordance with the requirements of clause (2)(v)('d') of this subdivision.

('c') The fraction of organic biodegraded (F_bio ) shall be determined using the procedure specified in 40 CFR part 63, appendix C, as incorporated by reference in subdivision 370.1(e) of this Title.

('d') The _Mrbio shall be calculated by using the mass flow rates and fraction of organic biodegraded determined in accordance with the requirements of clauses (2)(ix)('b') and (2)(ix)('c'), respectively, of this subdivision and the following equation:

_Mrbio = E_b x F_bio

Where:

_Mrbio = Actual organic mass biodegradation rate, kg/hr.

E_b = Waste organic mass flow entering process as determined in accordance with the requirements of clause (2)(v)('d') of this subdivision, kg/hr.

F_bio = Fraction of organic biodegraded as determined in accordance with the requirements of clause (2)(ix)('c') of this subdivision.

(3) Procedure to determine the maximum organic vapor pressure of a hazardous waste in a tank.

(i) An owner or operator shall determine the maximum organic vapor pressure for each hazardous waste placed in a tank using Tank Level 1 controls in accordance with standards specified in paragraph 373-3.29(f)(3) of this section.

(ii) An owner or operator shall use either direct measurement as specified in subparagraph (3)(iii) of this subdivision or knowledge of the waste as specified by subparagraph (3)(iv) of this subdivision to determine the maximum organic vapor pressure which is representative of the hazardous waste composition stored or treated in the tank.

(iii) Direct measurement to determine the maximum organic vapor pressure of a hazardous waste.

('a') Sampling. A sufficient number of samples shall be collected to be representative of the waste contained in the tank. All samples shall be collected and handled in accordance with written procedures prepared by the owner or operator and documented in a site sampling plan. This plan shall describe the procedure by which representative samples of the hazardous waste are collected such that a minimum loss of organics occurs throughout the sample collection and handling process and by which sample integrity is maintained. A copy of the written sampling plan shall be maintained on-site in the facility operating records. An example of an acceptable sampling plan includes a plan incorporating sample collection and handling procedures in accordance with the requirements specified in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods," EPA Publication No. SW-846, (as incorporated by reference in subdivision 370.1(e) of this Title), or in Method 25D in 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

('b') Analysis. Any appropriate one of the following methods may be used to analyze the samples and compute the maximum organic vapor pressure of the hazardous waste:

('1') Method 25E in 40 CFR part 60 appendix A, as incorporated by reference in subdivision 370.1(e) of this Title;

('2') Methods described in American Petroleum Institute Publication 2517, Third Edition, February 1989, "Evaporative Loss from External Floating-Roof Tanks," as incorporated by reference in subdivision 370.1(e) of this Title;

('3') Methods obtained from standard reference texts;

('4') ASTM Method 2879-92, as incorporated by reference in subdivision 370.1(e) of this Title; and

('5') Any other method approved by the commissioner.

(iv) Use of knowledge to determine the maximum organic vapor pressure of the hazardous waste. Documentation shall be prepared and recorded that presents the information used as the basis for the owner's or operator's knowledge that the maximum organic vapor pressure of the hazardous waste is less than the maximum vapor pressure limit listed in clause 373-3.29(f)(2)(i)('a') of this section for the applicable tank design capacity category. An example of information that may be used is documentation that the hazardous waste is generated by a process for which at other locations it previously has been determined by direct measurement that the waste maximum organic vapor pressure is less than the maximum vapor pressure limit for the appropriate tank design capacity category.

(4) Procedure for determining no detectable organic emissions for the purpose of complying with this section:

(i) The test shall be conducted in accordance with the procedures specified in Method 21 of 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. Each potential leak interface (i.e., a location where organic vapor leakage could occur) on the cover and associated closure devices shall be checked. Potential leak interfaces that are associated with covers and closure devices include, but are not limited to: The interface of the cover and its foundation mounting; the periphery of any opening on the cover and its associated closure device; and the sealing seat interface on a spring-loaded pressure relief valve.

(ii) The test shall be performed when the unit contains a hazardous waste having an organic concentration representative of the range of concentrations for the hazardous waste expected to be managed in the unit. During the test, the cover and closure devices shall be secured in the closed position.

(iii) The detection instrument shall meet the performance criteria of Method 21 of 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title, except the instrument response factor criteria in section 3.1.2(a) of Method 21 shall be for the average composition of the organic constituents in the hazardous waste placed in the waste management unit, not for each individual organic constituent.

(iv) The detection instrument shall be calibrated before use on each day of its use by the procedures specified in Method 21 of 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title.

(v) Calibration gases shall be as follows:

('a') Zero air (less than 10 ppmv hydrocarbon in air), and

('b') A mixture of methane or n-hexane and air at a concentration of approximately, but less than 10,000 ppmv methane or n-hexane.

(vi) The background level shall be determined according to the procedures in Method 21 of 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. (vii) Each potential leak interface shall be checked by traversing the instrument probe around the potential leak interface as close to the interface as possible, as described in Method 21 of 40 CFR part 60, appendix A, as incorporated by reference in subdivision 370.1(e) of this Title. In the case when the configuration of the cover or closure device prevents a complete traverse of the interface, all accessible portions of the interface shall be sampled. In the case when the configuration of the closure device prevents any sampling at the interface and the device is equipped with an enclosed extension or horn (e.g., some pressure relief devices), the instrument probe inlet shall be placed at approximately the center of the exhaust area to the atmosphere.

(viii) The arithmetic difference between the maximum organic concentration indicated by the instrument and the background level shall be compared with the value of 500 ppmv except when monitoring a seal around a rotating shaft that passes through a cover opening, in which case the comparison shall be as specified in subparagraph (4)(ix) of this subdivision. If the difference is less than 500 ppmv, then the potential leak interface is determined to operate with no detectable organic emissions.

(ix) For the seals around a rotating shaft that passes through a cover opening, the arithmetic difference between the maximum organic concentration indicated by the instrument and the background level shall be compared with the value of 10,000 ppmw. If the difference is less than 10,000 ppmw, then the potential leak interface is determined to operate with no detectable organic emissions.

(f) Standards: Tanks.

(1) The provisions of this section apply to the control of air pollutant emissions from tanks for which paragraph 373-3.29(d)(2) of this section references the use of this subdivision for such air emission control.

(2) The owner or operator shall control air pollutant emissions from each tank subject to this subdivision in accordance with following requirements, as applicable:

(i) For a tank that manages hazardous waste that meets all of the conditions specified in clause (2)(i)('a') through (2)(i)('c') of this subdivision, the owner or operator shall control air pollutant emissions from the tank in accordance with the Tank Level 1 controls specified in paragraph (3) of this subdivision or Tank Level 2 controls specified in paragraph (4) of this subdivision.

('a') The hazardous waste in the tank has a maximum organic vapor pressure which is less than the maximum organic vapor pressure limit for the tank's design capacity category as follows:

('1') For a tank design capacity equal to or greater than 151 m³, the maximum organic vapor pressure limit for the tank is 5.2 kPa.

('2') For a tank design capacity equal to or greater than 75 m³ but less than 151 m³, the maximum organic vapor pressure limit for the tank is 27.6 kPa.

('3') For a tank design capacity less than 75 m³, the maximum organic vapor pressure limit for the tank is 76.6 kPa.

('b') The hazardous waste in the tank is not heated by the owner or operator to a temperature that is greater than the temperature at which the maximum organic vapor pressure of the hazardous waste is determined for the purpose of complying with clause (2)(i)('a') of this subdivision.

('c') The hazardous waste in the tank is not treated by the owner or operator using a waste stabilization process, as defined in subdivision 373-3.29(b) of this section.

(ii) For a tank that manages hazardous waste that does not meet all of the conditions specified in clauses (2)(i)('a') through (2)(i)('c') of this subdivision, the owner or operator shall control air pollutant emissions from the tank by using Tank Level 2 controls in accordance with the requirements of paragraph (4) of this subdivision. Examples of tanks required to use Tank Level 2 controls include: A tank used for a waste stabilization process; and a tank for which the hazardous waste in the tank has a maximum organic vapor pressure that is equal to or greater than the maximum organic vapor pressure limit for the tank's design capacity category as specified in clause (2)(i)('a') of this subdivision.

(3) Owners and operators controlling air pollutant emissions from a tank using Tank Level 1 controls shall meet the requirements specified in subparagraphs (3)(i) through (3)(iv) of this subdivision:

(i) The owner or operator shall determine the maximum organic vapor pressure for a hazardous waste to be managed in the tank using Tank Level 1 controls before the first time the hazardous waste is placed in the tank. The maximum organic vapor pressure shall be determined using the procedures specified in paragraph 373-3.29(e)(3) of this section. Thereafter, the owner or operator shall perform a new determination whenever changes to the hazardous waste managed in the tank could potentially cause the maximum organic vapor pressure to increase to a level that is equal to or greater than the maximum organic vapor pressure limit for the tank design capacity category specified in clause (2)(i)('a') of this subdivision, as applicable to the tank.

(ii) The tank shall be equipped with a fixed roof designed to meet the following specifications:

('a') The fixed roof and its closure devices shall be designed to form a continuous barrier over the entire surface area of the hazardous waste in the tank. The fixed roof may be a separate cover installed on the tank (e.g., a removable cover mounted on an open-top tank) or may be an integral part of the tank structural design (e.g., a horizontal cylindrical tank equipped with a hatch).

('b') The fixed roof shall be installed in a manner such that there are no visible cracks, holes, gaps, or other open spaces between roof section joints or between the interface of the roof edge and the tank wall.

('c') Each opening in the fixed roof, and any manifold system associated with the fixed roof, shall be either:

('1') Equipped with a closure device designed to operate such that when the closure device is secured in the closed position there are no visible cracks, holes, gaps, or other open spaces in the closure device or between the perimeter of the opening and the closure device; or

('2') Connected by a closed-vent system that is vented to a control device. The control device shall remove or destroy organics in the vent stream, and shall be operating whenever hazardous waste is managed in the tank, except as provided for in items 373-3.29(f)(3)(ii)('c')('2')('i') and (3)(ii)('c')('2')('ii') of this subdivision.

('i') During periods it is necessary to provide access to the tank for performing the activities of item 373-3.29(f)(3)(ii)('c')('2')('ii') of this subdivision, venting of the vapor headspace underneath the fixed roof to the control device is not required, opening of the closure devices is allowed and removal of the fixed roof is allowed. Following completion of the activity, the owner or operator shall promptly secure the closure device in the closed position or reinstall the cover, as applicable, and resume operation of the control device.

('ii') During periods of routine inspection, maintenance, or other activities needed for normal operations, and for the removal of accumulated sludge or other residues from the bottom of the tank.

('d') The fixed roof and its closure devices shall be made of suitable materials that will minimize exposure of the hazardous waste to the atmosphere, to the extent practical, and will maintain the integrity of the fixed roof and closure devices throughout their intended service life. Factors to be considered when selecting the materials for and designing the fixed roof and closure devices shall include: Organic vapor permeability, the effects of any contact with the hazardous waste or its vapors managed in the tank; the effects of outdoor exposure to wind, moisture, and sunlight; and the operating practices used for the tank on which the fixed roof is installed.

(iii) Whenever a hazardous waste is in the tank, the fixed roof shall be installed with each closure device secured in the closed position except as follows:

('a') Opening of the closure devices or removal of the fixed roof is allowed at the following times:

('1') To provide access to the tank for performing routine inspection, maintenance, or other activities needed for normal operations. Examples of such activities include those times when a worker needs to open a port to sample the liquid in the tank, or when a worker needs to open a hatch to maintain or repair equipment. Following completion of the activity, the owner or operator shall promptly secure the closure device in the closed position or reinstall the cover, as applicable, to the tank.

('2') To remove accumulated sludge or other residues from the bottom of the tank.

('b') Opening of a spring-loaded pressure-vacuum relief valve, conservation vent, or similar type of pressure relief device which vents to the atmosphere is allowed during normal operations for the purpose of maintaining the tank internal pressure in accordance with the tank design specifications. The device shall be designed to operate with no detectable organic emissions when the device is secured in the closed position. The settings at which the device opens shall be established such that the device remains in the closed position whenever the tank internal pressure is within the internal pressure operating range determined by the owner or operator based on the tank manufacturer recommendations, applicable regulations, fire protection and prevention codes, standard engineering codes and practices, or other requirements for the safe handling of flammable, ignitable, explosive, reactive, or hazardous materials. Examples of normal operating conditions that may require these devices to open are during those times when the tank internal pressure exceeds the internal pressure operating range for the tank as a result of loading operations or diurnal ambient temperature fluctuations.

('c') Opening of a safety device, as defined in subdivision 373-3.29(b) of this section, is allowed at any time conditions require doing so to avoid an unsafe condition.

(iv) The owner or operator shall inspect the air emission control equipment in accordance with the following requirements.

('a') The fixed roof and its closure devices shall be visually inspected by the owner or operator to check for defects that could result in air pollutant emissions. Defects include, but are not limited to, visible cracks, holes, or gaps in the roof sections or between the roof and the tank wall; broken, cracked, or otherwise damaged seals or gaskets on closure devices; and broken or missing hatches, access covers, caps, or other closure devices.

('b') The owner or operator shall perform an initial inspection of the fixed roof and its closure devices on or before the date that the tank becomes subject to this subdivision. Thereafter, the owner or operator shall perform the inspections at least once every year except under the special conditions provided for in paragraph (12) of this subdivision.

('c') In the event that a defect is detected, the owner or operator shall repair the defect in accordance with the requirements of paragraph (11) of this subdivision.

('d') The owner or operator shall maintain a record of the inspection in accordance with the requirements specified in paragraph 373-3.29(k)(2) of this section.

(4) Owners and operators controlling air pollutant emissions from a tank using Tank Level 2 controls shall use one of the following tanks:

(i) A fixed-roof tank equipped with an internal floating roof in accordance with the requirements specified in paragraph (5) of this subdivision;

(ii) A tank equipped with an external floating roof in accordance with the requirements specified in paragraph (6) of this subdivision;

(iii) A tank vented through a closed-vent system to a control device in accordance with the requirements specified in paragraph (7) of this subdivision;

(iv) A pressure tank designed and operated in accordance with the requirements specified in paragraph (8) of this subdivision; or

(v) A tank located inside an enclosure that is vented through a closed-vent system to an enclosed combustion control device in accordance with the requirements specified in paragraph (9) of this subdivision.

(5) The owner or operator who controls air pollutant emissions from a tank using a fixed-roof with an internal floating roof shall meet the requirements specified in subparagraphs (5)(i) through (5)(iii) of this subdivision.

(i) The tank shall be equipped with a fixed roof and an internal floating roof in accordance with the following requirements:

('a') The internal floating roof shall be designed to float on the liquid surface except when the floating roof must be supported by the leg supports.

('b') The internal floating roof shall be equipped with a continuous seal between the wall of the tank and the floating roof edge that meets either of the following requirements:

('1') A single continuous seal that is either a liquid-mounted seal or a metallic shoe seal, as defined in subdivision 373-3.29(b) of this section; or

('2') two continuous seals mounted one above the other. The lower seal may be a vapor-mounted seal.

('c') The internal floating roof shall meet the following specifications:

('1') Each opening in a noncontact internal floating roof except for automatic bleeder vents (vacuum breaker vents) and the rim space vents is to provide a projection below the liquid surface.

('2') Each opening in the internal floating roof shall be equipped with a gasketed cover or gasketed lid except for leg sleeves, automatic bleeder vents, rim space vents, column wells, ladder wells, sample wells and stub drains.

('3') Each penetration of the internal floating roof for the purpose of sampling shall have a slit fabric cover that covers at least 90 percent of the opening.

('4') Each automatic bleeder vent and rim space vent shall be gasketed.

('5') Each penetration of the internal floating roof that allows for passage of a ladder shall have a gasketed sliding cover.

('6') Each penetration of the internal floating roof that allows for passage of a column supporting the fixed roof shall have a flexible fabric sleeve seal or a gasketed sliding cover.

(ii) The owner or operator shall operate the tank in accordance with the following requirements:

('a') When the floating roof is resting on the leg supports, the process of filling, emptying, or refilling shall be continuous and shall be completed as soon as practical.

('b') Automatic bleeder vents are to be set closed at all times when the roof is floating, except when the roof is being floated off or is being landed on the leg supports.

('c') Prior to filling the tank, each cover, access hatch, gauge float well or lid on any opening in the internal floating roof shall be bolted or fastened closed (i.e., no visible gaps). Rim space vents are to be set to open only when the internal floating roof is not floating or when the pressure beneath the rim exceeds the manufacturer's recommended setting.

(iii) The owner or operator shall inspect the internal floating roof in accordance with the procedures specified as follows:

('a') The floating roof and its closure devices shall be visually inspected by the owner or operator to check for defects that could result in air pollutant emissions. Defects include, but are not limited to: The internal floating roof is not floating on the surface of the liquid inside the tank; liquid has accumulated on top of the internal floating roof; any portion of the roof seals have detached from the roof rim; holes, tears, or other openings are visible in the seal fabric; the gaskets no longer close off the hazardous waste surface from the atmosphere; or the slotted membrane has more than ten percent open area.

('b') The owner or operator shall inspect the internal floating roof components as follows except as provided in clause (5)(iii)('c') of this subdivision:

('1') Visually inspect the internal floating roof components through openings on the fixed-roof (e.g., manholes and roof hatches) at least once every twelve months after initial fill, and

('2') Visually inspect the internal floating roof, primary seal, secondary seal (if one is in service), gaskets, slotted membranes, and sleeve seals (if any) each time the tank is emptied and degassed and at least every ten years.

('c') As an alternative to performing the inspections specified in clause (5)(iii)('b') of this subdivision for an internal floating roof equipped with two continuous seals mounted one above the other, the owner or operator may visually inspect the internal floating roof, primary and secondary seals, gaskets, slotted membranes, and sleeve seals (if any) each time the tank is emptied and degassed and at least every five years.

('d') Prior to each inspection required by clause (5)(iii)('b') or (5)(iii)('c') of this subdivision, the owner or operator shall notify the commissioner in advance of each inspection to provide the commissioner with the opportunity to have an observer present during the inspection. The owner or operator shall notify the commissioner of the date and location of the inspection as follows:

('1') Prior to each visual inspection of an internal floating roof in a tank that has been emptied and degassed, written notification shall be prepared and sent by the owner or operator so that it is received by the commissioner at least thirty calendar days before refilling the tank except when an inspection is not planned as provided for in subclause (5)(iii)('d')('2') of this subdivision.

('2') When a visual inspection is not planned and the owner or operator could not have known about the inspection thirty calendar days before refilling the tank, the owner or operator shall notify the commissioner as soon as possible, but no later than seven calendar days before refilling of the tank. This notification may be made by telephone and immediately followed by a written explanation for why the inspection is unplanned. Alternatively, written notification, including the explanation for the unplanned inspection, may be sent so that it is received by the commissioner at least seven calendar days before refilling the tank.

('e') In the event that a defect is detected, the owner or operator shall repair the defect in accordance with the requirements of paragraph (11) of this subdivision.

('f') The owner or operator shall maintain a record of the inspection in accordance with the requirements specified in paragraph 373-3.29(k)(2) of this section.

(iv) Safety devices, as defined in subdivision 373-3.29(b) of this section, may be installed and operated as necessary on any tank complying with the requirements of paragraph 373-3.29(f)(5) of this subdivision.

(6) The owner or operator who controls air pollutant emissions from a tank using an external floating roof shall meet the requirements specified in subparagraphs (6)(i) through (6)(iii) of this subdivision.

(i) The owner or operator shall design the external floating roof in accordance with the following requirements:

('a') The external floating roof shall be designed to float on the liquid surface except when the floating roof must be supported by the leg supports.

('b') The floating roof shall be equipped with two continuous seals, one above the other, between the wall of the tank and the roof edge. The lower seal is referred to as the primary seal, and the upper seal is referred to as the secondary seal.

('1') The primary seal shall be a liquid-mounted seal or a metallic shoe seal, as defined in subdivision 373-3.29(b) of this section. The total area of the gaps between the tank wall and the primary seal shall not exceed 212 square centimeters (cm²) per meter of tank diameter, and the width of any portion of these gaps shall not exceed 3.8 centimeters (cm). If a metallic shoe seal is used for the primary seal, the metallic shoe seal shall be designed so that one end extends into the liquid in the tank and the other end extends a vertical distance of at least 61 centimeters above the liquid surface.

('2') The secondary seal shall be mounted above the primary seal and cover the annular space between the floating roof and the wall of the tank. The total area of the gaps between the tank wall and the secondary seal shall not exceed 21.2 square centimeters (cm²) per meter of the tank diameter, and the width of any portion of these gaps shall not exceed 1.3 centimeters (cm).

('c') The external floating roof shall meet the following specifications:

('1') Except for automatic bleeder vents (vacuum breaker vents) and rim space vents, each opening in a noncontact external floating roof shall provide a projection below the liquid surface.

('2') Except for automatic bleeder vents, rim space vents, roof drains, and leg sleeves, each opening in the roof shall be equipped with a gasketed cover, seal or lid.

('3') Each access hatch and each gauge float well shall be equipped with a cover designed to be bolted or fastened when the cover is secured in the closed position.

('4') Each automatic bleeder vent and each rim space vent shall be equipped with a gasket.

('5') Each roof drain that empties into the liquid managed in the tank shall be equipped with a slotted membrane fabric cover that covers at least ninety percent of the area of the opening.

('6') Each unslotted and slotted guide pole well shall be equipped with a gasketed sliding cover or a flexible fabric sleeve seal.

('7') Each unslotted guide pole shall be equipped with a gasketed cap on the end of the pole.

('8') Each slotted guide pole shall be equipped with a gasketed float or other device which closes off the liquid surface from the atmosphere.

('9') Each gauge hatch and each sample well shall be equipped with a gasketed cover.

(ii) The owner or operator shall operate the tank in accordance with the following requirements:

('a') When the floating roof is resting on the leg supports, the process of filling, emptying, or refilling shall be continuous and shall be completed as soon as practical.

('b') Except for automatic bleeder vents, rim space vents, roof drains, and leg sleeves, each opening in the roof shall be secured and maintained in a closed position at all times except when the closure device must be open for access.

('c') Covers on each access hatch and each gauge float well shall be bolted or fastened when secured in the closed position.

('d') Automatic bleeder vents shall be set closed at all times when the roof is floating, except when the roof is being floated off or is being landed on the leg supports.

('e') Rim space vents shall be set to open only at those times that the roof is being floated off the roof leg supports or when the pressure beneath the rim seal exceeds the manufacturer's recommended setting.

('f') The cap on the end of each unslotted guide pole shall be secured in the closed position at all times except when measuring the level or collecting samples of the liquid in the tank.

('g') The cover on each gauge hatch or sample well shall be secured in the closed position at all times except when the hatch or well must be opened for access.

('h') Both the primary seal and the secondary seal shall completely cover the annular space between the external floating roof and the wall of the tank in a continuous fashion except during inspections.

(iii) The owner or operator shall inspect the external floating roof in accordance with the procedures specified as follows:

('a') The owner or operator shall measure the external floating roof seal gaps in accordance with the following requirements:

('1') The owner or operator shall perform measurements of gaps between the tank wall and the primary seal within sixty calendar days after initial operation of the tank following installation of the floating roof and, thereafter, at least once every five years.

('2') The owner or operator shall perform measurements of gaps between the tank wall and the secondary seal within sixty calendar days after initial operation of the tank following installation of the floating roof and, thereafter, at least once every year.

('3') If a tank ceases to hold hazardous waste for a period of one year or more, subsequent introduction of hazardous waste into the tank shall be considered an initial operation for the purposes of subclauses (6)(iii)('a')('1') and (6)(iii)('a')('2') of this subdivision.

('4') The owner or operator shall determine the total surface area of gaps in the primary seal and in the secondary seal individually using the following procedure:

('i') The seal gap measurements shall be performed at one or more floating roof levels when the roof is floating off the roof supports.

('ii') Seal gaps, if any, shall be measured around the entire perimeter of the floating roof in each place where a 0.32-centimeter (cm) diameter uniform probe passes freely (without forcing or binding against the seal) between the seal and the wall of the tank and measure the circumferential distance of each such location.

('iii') For a seal gap measured under subparagraph (6)(iii) of this subdivision, the gap surface area shall be determined by using probes of various widths to measure accurately the actual distance from the tank wall to the seal and multiplying each such width by its respective circumferential distance.

('iv') The total gap area shall be calculated by adding the gap surface areas determined for each identified gap location for the primary seal and the secondary seal individually, and then dividing the sum for each seal type by the nominal diameter of the tank. These total gap areas for the primary seal and secondary seal are then compared to the respective standards for the seal type as specified in clause (6)(i)('b') of this subdivision.

('5') In the event that the seal gap measurements do not conform to the specifications in clause (6)(i)('b') of this subdivision, the owner or operator shall repair the defect in accordance with the requirements of paragraph (11) of this subdivision.

('6') The owner or operator shall maintain a record of the inspection in accordance with the requirements specified in paragraph 373-3.29(k)(2) of this section.

('b') The owner or operator shall visually inspect the external floating roof in accordance with the following requirements:

('1') The floating roof and its closure devices shall be visually inspected by the owner or operator to check for defects that could result in air pollutant emissions. Defects include, but are not limited to: Holes, tears, or other openings in the rim seal or seal fabric of the floating roof; a rim seal detached from the floating roof; all or a portion of the floating roof deck being submerged below the surface of the liquid in the tank; broken, cracked, or otherwise damaged seals or gaskets on closure devices; and broken or missing hatches, access covers, caps, or other closure devices.

('2') The owner or operator shall perform an initial inspection of the external floating roof and its closure devices on or before the date that the tank becomes subject to this subdivision. Thereafter, the owner or operator shall perform the inspections at least once every year except for the special conditions provided for in paragraph (12) of this subdivision.

('3') In the event that a defect is detected, the owner or operator shall repair the defect in accordance with the requirements of paragraph (11) of this subdivision.

('4') The owner or operator shall maintain a record of the inspection in accordance with the requirements specified in paragraph 373-3.29(k)(2) of this section.

('c') Prior to each inspection required by clause (6)(iii)('a') or (6)(iii)('b') of this subdivision, the owner or operator shall notify the commissioner in advance of each inspection to provide the commissioner with the opportunity to have an observer present during the inspection. The owner or operator shall notify the commissioner of the date and location of the inspection as follows:

('1') Prior to each inspection to measure external floating roof seal gaps as required under clause (6)(iii)('a') of this subdivision, written notification shall be prepared and sent by the owner or operator so that it is received by the commissioner at least thirty calendar days before the date the measurements are scheduled to be performed.

('2') Prior to each visual inspection of the external floating roof in a tank that has been emptied and degassed, written notification shall be prepared and sent by the owner or operator so that it is received by the commissioner at least thirty calendar days before refilling the tank except when an inspection is not planned as provided for in subclause (6)(iii)('c')('3') of this subdivision.

('3') When a visual inspection is not planned and the owner or operator could not have known about the inspection thirty calendar days before refilling the tank, the owner or operator shall notify the commissioner as soon as possible, but no later than seven calendar days before refilling of the tank. This notification may be made by telephone and immediately followed by a written explanation for why the inspection is unplanned. Alternatively, written notification, including the explanation for the unplanned inspection, may be sent so that it is received by the commissioner at least seven calendar days before refilling the tank.

(iv) Safety devices, as defined in subdivision 373-3.29(b) of this section , may be installed and operated as necessary on any tank complying with the requirements of paragraph 373-3.29(f)(6) of this subdivision.

(7) The owner or operator who controls air pollutant emissions from a tank by venting the tank to a control device shall meet the requirements specified in subparagraphs (7)(i) through (7)(iii) of this subdivision.

(i) The tank shall be covered by a fixed roof and vented directly through a closed-vent system to a control device in accordance with the following requirements:

('a') The fixed roof and its closure devices shall be designed to form a continuous barrier over the entire surface area of the liquid in the tank.

('b') Each opening in the fixed roof not vented to the control device shall be equipped with a closure device. If the pressure in the vapor headspace underneath the fixed roof is less than atmospheric pressure when the control device is operating, the closure devices shall be designed to operate such that when the closure device is secured in the closed position there are no visible cracks, holes, gaps, or other open spaces in the closure device or between the perimeter of the cover opening and the closure device. If the pressure in the vapor headspace underneath the fixed roof is equal to or greater than atmospheric pressure when the control device is operating, the closure device shall be designed to operate with no detectable organic emissions.

('c') The fixed roof and its closure devices shall be made of suitable materials that will minimize exposure of the hazardous waste to the atmosphere, to the extent practical, and will maintain the integrity of the fixed roof and closure devices throughout their intended service life. Factors to be considered when selecting the materials for and designing the fixed roof and closure devices shall include: Organic vapor permeability, the effects of any contact with the liquid and it vapor managed in the tank; the effects of outdoor exposure to wind, moisture, and sunlight; and the operating practices used for the tank on which the fixed roof is installed.

('d') The closed-vent system and control device shall be designed and operated in accordance with the requirements of subdivision 373-3.29(i) of this section.

(ii) Whenever a hazardous waste is in the tank, the fixed roof shall be installed with each closure device secured in the closed position and the vapor headspace underneath the fixed roof vented to the control device except as follows:

('a') Venting to the control device is not required, and opening of closure devices or removal of the fixed roof is allowed at the following times:

Subpart 373-3: Interim Status Standards For Owners and Operators Of Hazardous Waste Facilities - Page 4

Contents:

§373-3.29 - Air Emission Standards for Tanks, Surface Impoundments and Containers