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).