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). NR 665.1085(5)(a)(a) Equip the tank with a fixed roof and an internal floating roof according to all of the following requirements: NR 665.1085(5)(a)1.1. Design the internal floating roof to float on the liquid surface except when the floating roof must be supported by the leg supports. NR 665.1085(5)(a)2.2. Equip the internal floating roof with a continuous seal between the wall of the tank and the floating roof edge that meets any of the following requirements: NR 665.1085(5)(a)2.b.b. Two continuous seals mounted one above the other. The lower seal may be a vapor-mounted seal. NR 665.1085(5)(a)3.3. The internal floating roof shall meet all of the following specifications: NR 665.1085(5)(a)3.a.a. Each opening in a non-contact internal floating roof, except for automatic bleeder vents (vacuum breaker vents) and the rim space vents, provides a projection below the liquid surface. NR 665.1085(5)(a)3.b.b. Each opening in the internal floating roof is equipped with a gasketed cover or a gasketed lid except for leg sleeves, automatic bleeder vents, rim space vents, column wells, ladder wells, sample wells and stub drains. NR 665.1085(5)(a)3.c.c. Each penetration of the internal floating roof for the purpose of sampling has a slit fabric cover that covers at least 90 percent of the opening. NR 665.1085(5)(a)3.e.e. Each penetration of the internal floating roof that allows for passage of a ladder has a gasketed sliding cover. NR 665.1085(5)(a)3.f.f. Each penetration of the internal floating roof that allows for passage of a column supporting the fixed roof has a flexible fabric sleeve seal or a gasketed sliding cover. NR 665.1085(5)(b)(b) Operate the tank according to all of the following requirements: NR 665.1085(5)(b)1.1. 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. NR 665.1085(5)(b)2.2. Set automatic bleeder vents to 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. NR 665.1085(5)(b)3.3. Prior to filling the tank, bolt or fasten closed (i.e., no visible gaps) each cover, access hatch, gauge float well or lid on any opening in the internal floating roof. Set rim space vents to open only when the internal floating roof is not floating or when the pressure beneath the rim exceeds the manufacturer’s recommended setting. NR 665.1085(5)(c)(c) Inspect the internal floating roof according to all of the following requirements: NR 665.1085(5)(c)1.1. Visually inspect the floating roof and its closure devices 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 10 percent open area. NR 665.1085(5)(c)2.2. Inspect the internal floating roof components as follows, except as provided in subd. 3.: NR 665.1085(5)(c)2.a.a. Visually inspect the internal floating roof components through openings on the fixed-roof (e.g., manholes and roof hatches) at least once every 12 months after initial fill. NR 665.1085(5)(c)2.b.b. 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 10 years. NR 665.1085(5)(c)3.3. As an alternative to performing the inspections in subd. 2. for an internal floating roof equipped with 2 continuous seals mounted one above the other, 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 5 years. NR 665.1085(5)(c)4.4. Prior to each inspection required by subd. 2. or 3., notify the department in advance of each inspection to provide the department with the opportunity to have an observer present during the inspection. Notify the department of the date and location of the inspection as follows: NR 665.1085(5)(c)4.a.a. Prior to each visual inspection of an internal floating roof in a tank that has been emptied and degassed, prepare and send written notification so that the department receives it at least 30 calendar days before refilling the tank, except when an inspection is not planned as provided for in subd. 4. b. NR 665.1085(5)(c)4.b.b. When a visual inspection is not planned and the owner or operator could not have known about the inspection 30 calendar days before refilling the tank, notify the department as soon as possible, but no later than 7 calendar days before refilling the tank. Make this notification by telephone and immediately follow with a written explanation for why the inspection is unplanned. Alternatively, send written notification, including the explanation for the unplanned inspection, so that the department receives it at least 7 calendar days before refilling the tank. NR 665.1085(5)(d)(d) Safety devices, as defined in s. NR 665.1081, may be installed and operated as necessary on any tank complying with this subsection. NR 665.1085(6)(6) The owner or operator who controls air pollutant emissions from a tank using an external floating roof shall meet pars. (a) to (c). NR 665.1085(6)(a)(a) Design the external floating roof according to all of the following requirements: NR 665.1085(6)(a)1.1. Design the external floating roof to float on the liquid surface except when the floating roof must be supported by the leg supports. NR 665.1085(6)(a)2.2. Equip the floating roof with 2 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. NR 665.1085(6)(a)2.a.a. The primary seal shall be a liquid-mounted seal or a metallic shoe seal, as defined in s. NR 665.1081. The total area of the gaps between the tank wall and the primary seal may not exceed 212 square centimeters (cm2) per meter of tank diameter, and the width of any portion of these gaps may not exceed 3.8 centimeters (cm). If a metallic shoe seal is used for the primary seal, design the metallic shoe seal 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. NR 665.1085(6)(a)2.b.b. Mount the secondary seal 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 may not exceed 21.2 square centimeters (cm2) per meter of tank diameter, and the width of any portion of these gaps may not exceed 1.3 centimeters (cm). NR 665.1085(6)(a)3.3. The external floating roof shall meet all of the following specifications: NR 665.1085(6)(a)3.a.a. Except for automatic bleeder vents (vacuum breaker vents) and rim space vents, each opening in a non-contact external floating roof shall project below the liquid surface. NR 665.1085(6)(a)3.b.b. Except for automatic bleeder vents, rim space vents, roof drains and leg sleeves, equip each opening in the roof with a gasketed cover, seal or lid. NR 665.1085(6)(a)3.c.c. Equip each access hatch and each gauge float well with a cover designed to be bolted or fastened when the cover is secured in the closed position. NR 665.1085(6)(a)3.e.e. Equip each roof drain that empties into the liquid managed in the tank with a slotted membrane fabric cover that covers at least 90 percent of the area of the opening. NR 665.1085(6)(a)3.f.f. Equip each unslotted and slotted guide pole well with a gasketed sliding cover or a flexible fabric sleeve seal.
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Department of Natural Resources (NR)
Chs. NR 600-699; Environmental Protection – Hazardous Waste Management
administrativecode/NR 665.1085(3)(c)
administrativecode/NR 665.1085(3)(c)
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