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 determined according to sub. (1)
n = Total number of “y” hazardous waste streams treated by process
Vy = Average volumetric flow rate of hazardous waste stream “y” at the point of waste origination, m 3/hr
ky = Density of hazardous waste stream “y”, kg/m 3
= Average VO concentration of hazardous waste stream “y” at the point of waste origination determined according to sub. (1), ppmw NR 665.1084(2)(h)(h) Procedure to determine the actual organic mass removal rate (MR) for a treated hazardous waste: NR 665.1084(2)(h)1.1. Determine the MR based on results for a minimum of 3 consecutive runs. The sampling time for each run shall be one hour. NR 665.1084(2)(h)2.2. Determine the waste volatile organic mass flow entering the process (Eb) and the waste volatile organic mass flow exiting the process (Ea) according to par. (e) 4. NR 665.1084(2)(h)3.3. Calculate the MR using the mass flow rate determined according to subd. 2. and the following equation: where:
MR = Actual organic mass removal rate, kg/hr
Eb = Waste volatile organic mass flow entering process determined according to par. (e) 4., kg/hr
Ea = Waste volatile organic mass flow exiting process determined according to par. (e) 4., kg/hr
NR 665.1084(2)(i)(i) Procedure to determine the actual organic mass biodegradation rate (MRbio) for a treated hazardous waste: NR 665.1084(2)(i)1.1. Determine the MRbio based on results for a minimum of 3 consecutive runs. The sampling time for each run shall be one hour. NR 665.1084(2)(i)4.4. Calculate the MRbio using the mass flow rates and fraction of organic biodegraded determined according to subds. 2. and 3., respectively, and the following equation: where:
MRbio = Actual organic mass biodegradation rate, kg/hr
Eb = Waste organic mass flow entering process determined according to par. (e) 4., kg/hr
Fbio = Fraction of organic biodegraded determined according to subd. 3.
NR 665.1084(3)(3) Procedure to determine the maximum organic vapor pressure of a hazardous waste in a tank. NR 665.1084(3)(a)(a) An owner or operator shall determine the maximum organic vapor pressure for each hazardous waste placed in a tank using Tank Level 1 controls according to the standards in s. NR 665.1085 (3). NR 665.1084(3)(b)(b) An owner or operator shall use either direct measurement as specified in par. (c) or knowledge of the waste as specified in par. (d) to determine the maximum organic vapor pressure which is representative of the hazardous waste composition stored or treated in the tank. NR 665.1084(3)(c)(c) If the owner or operator uses direct measurement to determine the maximum organic vapor pressure of a hazardous waste, the owner or operator shall do all of the following: NR 665.1084(3)(c)1.1. ‘Sampling.’ Collect a sufficient number of samples to be representative of the waste contained in the tank. Collect and handle all samples according to written procedures prepared by the owner or operator and documented in a site sampling plan. The plan shall describe the procedure for collecting representative samples of the hazardous waste which minimizes loss of organics throughout the sample collection and handling process and maintains sample integrity. Maintain a copy of the written sampling plan on-site in the facility operating records. An example of acceptable sample collection and handling procedures may be found in Method 25D in Appendix A of 40 CFR part 60, both incorporated by reference in s. NR 660.11. NR 665.1084(3)(c)2.2. ‘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: NR 665.1084(3)(c)2.b.b. Methods described in American Petroleum Institute Publication 2517, Third Edition, February 1989, “Evaporative Loss from External Floating-Roof Tanks”, incorporated by reference in s. NR 660.11. NR 665.1084(3)(d)(d) If the owner or operator uses knowledge to determine the maximum organic vapor pressure of the hazardous waste, the owner or operator shall prepare and record documentation 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 s. NR 665.1085 (2) (a) 1. 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. NR 665.1084(4)(4) Procedure for determining no detectable organic emissions for the purpose of complying with this subchapter. NR 665.1084(4)(a)(a) Conduct the test according to Method 21 in appendix A of 40 CFR part 60, incorporated by reference in s. NR 660.11. Check each potential leak interface (i.e., a location where organic vapor leakage could occur) on the cover and associated closure devices. 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. NR 665.1084(4)(b)(b) Perform the test 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, secure the cover and closure devices in the closed position. NR 665.1084(4)(c)(c) The detection instrument shall meet the performance criteria of Method 21 in appendix A of 40 CFR part 60, incorporated by reference in s. NR 660.11, except the instrument response factor criteria in section 3.1.2(a) 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. NR 665.1084(4)(e)2.2. A mixture of methane or n-hexane and air at a concentration of approximately, but less than, 10,000 ppmv methane or n-hexane. NR 665.1084(4)(g)(g) Check each potential leak interface by traversing the instrument probe around the potential leak interface as close to the interface as possible, as described in Method 21 in appendix A of 40 CFR part 60, incorporated by reference in s. NR 660.11. In the case when the configuration of the cover or closure device prevents a complete traverse of the interface, sample all accessible portions of the interface. 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), place the instrument probe inlet at approximately the center of the exhaust area to the atmosphere. NR 665.1084(4)(h)(h) Compare the arithmetic difference between the maximum organic concentration indicated by the instrument and the background level 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 par. (i). If the difference is less than 500 ppmv, then the potential leak interface is determined to operate with no detectable organic emissions. NR 665.1084(4)(i)(i) For the seals around a rotating shaft that passes through a cover opening, compare the arithmetic difference between the maximum organic concentration indicated by the instrument and the background level 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. NR 665.1084 HistoryHistory: CR 05-032: cr. Register July 2006 No. 607, eff. 8-1-06; CR 16-007: am. (1) (c) 2. c., 3., (2) (c) 2. c., r. and recr. (2) (c) 3., am. (3) (c) 1. Register July 2017 No. 739, eff. 8-1-17; correction in (1) (c) 3. (intro.), (2) (c) 3. (intro.) made under s. 35.17, Stats., Register July 2017 No. 739. NR 665.1085(1)(1) This section applies to the control of air pollutant emissions from tanks for which s. NR 665.1083 (2) references the use of this section for the air emission control. NR 665.1085(2)(2) The owner or operator shall control air pollutant emissions from each tank subject to this section according to one of the following requirements, as applicable: NR 665.1085(2)(a)(a) For a tank that manages hazardous waste that meets all of the following conditions, control air pollutant emissions from the tank according to the Tank Level 1 controls specified in sub. (3) or the Tank Level 2 controls specified in sub. (4): NR 665.1085(2)(a)1.1. 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: NR 665.1085(2)(a)1.a.a. 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. NR 665.1085(2)(a)1.b.b. 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. NR 665.1085(2)(a)1.c.c. For a tank design capacity less than 75 m3, the maximum organic vapor pressure limit for the tank is 76.6 kPa. NR 665.1085(2)(a)2.2. The hazardous waste in the tank is not heated 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 subd. 1. NR 665.1085(2)(b)(b) For a tank that manages hazardous waste that does not meet all of the conditions in par. (a) 1. to 3., control air pollutant emissions from the tank using Tank Level 2 controls according to sub. (4). 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 par. (a) 1. NR 665.1085(3)(3) Owners and operators controlling air pollutant emissions from a tank using Tank Level 1 controls shall meet all of the following requirements: NR 665.1085(3)(a)(a) 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. Determine the maximum organic vapor pressure using the procedures in s. NR 665.1084 (3). Thereafter, 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 sub. (2) (a) 1., as applicable to the tank. NR 665.1085(3)(b)(b) Equip the tank with a fixed roof designed to meet all of the following specifications: NR 665.1085(3)(b)1.1. Design the fixed roof and its closure devices 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). NR 665.1085(3)(b)2.2. Install the fixed roof 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. NR 665.1085(3)(b)3.3. Each opening in the fixed roof, and any manifold system associated with the fixed roof, shall be any of the following: NR 665.1085(3)(b)3.a.a. 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. NR 665.1085(3)(b)3.b.b. 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 follows: 1) During periods it is necessary to provide access to the tank for performing the activities of subd. 3. b. 2), venting of the vapor headspace underneath the fixed roof to the control device is not required, opening of closure devices is allowed and removal of the fixed roof is allowed. After completing the activity, promptly secure the closure device in the closed position or reinstall the cover, as applicable, and resume operation of the control device.
2) 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.
NR 665.1085(3)(b)4.4. Make the fixed roof and its closure devices 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 consider 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. NR 665.1085(3)(c)(c) Whenever a hazardous waste is in the tank, install the fixed roof with each closure device secured in the closed position except as follows: NR 665.1085(3)(c)1.1. Opening of closure devices or removal of the fixed roof is allowed at the following times: NR 665.1085(3)(c)1.a.a. To provide access to the tank for performing routine inspection, maintenance or other activities needed for normal operations. Examples of those 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. After completing the activity, promptly secure the closure device in the closed position or reinstall the cover, as applicable, to the tank. NR 665.1085(3)(c)2.2. 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 according to the tank design specifications. Design the device to operate with no detectable organic emissions when the device is secured in the closed position. Establish the settings at which the device opens 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 rules, 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. NR 665.1085(3)(c)3.3. Opening of a safety device, as defined in s. NR 665.1081, is allowed at any time conditions require doing so to avoid an unsafe condition. NR 665.1085(3)(d)(d) Inspect the air emission control equipment according to all of the following requirements: NR 665.1085(3)(d)1.1. Visually inspect the fixed roof and its closure devices 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. NR 665.1085(3)(d)2.2. Perform an initial inspection of the fixed roof and its closure devices on or before the date that the tank becomes subject to this section. Thereafter, perform the inspections at least once every year except under the special conditions provided for in sub. (12). NR 665.1085(4)(4) Owners and operators controlling air pollutant emissions from a tank using Tank Level 2 controls shall use one of the following tanks: NR 665.1085(4)(a)(a) A fixed-roof tank equipped with an internal floating roof according to sub. (5). NR 665.1085(4)(c)(c) A tank vented through a closed-vent system to a control device according to sub. (7). NR 665.1085(4)(e)(e) A tank located inside an enclosure that is vented through a closed-vent system to an enclosed combustion control device according to sub. (9). NR 665.1085(5)(5) The owner or operator who controls air pollutant emissions from a tank using a fixed-roof with an internal floating roof shall meet pars. (a) to (c).
