NR 665.1085(7)(a)(a) Cover the tank with a fixed roof and vent the tank directly through a closed-vent system to a control device according to all of the following requirements: NR 665.1085(7)(a)1.1. Design the fixed roof and its closure devices to form a continuous barrier over the entire surface area of the liquid in the tank. NR 665.1085(7)(a)2.2. Equip each opening in the fixed roof not vented to the control device 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, design the closure devices 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, design the closure device to operate with no detectable organic emissions. NR 665.1085(7)(a)3.3. 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 liquid and its 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. NR 665.1085(7)(b)(b) Whenever a hazardous waste is in the tank, install the fixed roof 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: NR 665.1085(7)(b)1.1. 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: NR 665.1085(7)(b)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 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(7)(b)2.2. 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(7)(c)(c) Inspect and monitor the air emission control equipment according to all of the following procedures: NR 665.1085(7)(c)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(7)(c)3.3. Perform an initial inspection of the air emission control equipment on or before the date that the tank becomes subject to this section. Thereafter, perform the inspections at least once every year except for the special conditions provided for in sub. (12). NR 665.1085(8)(8) The owner or operator who controls air pollutant emissions by using a pressure tank shall meet all of the following requirements. NR 665.1085(8)(a)(a) Design the tank to not vent to the atmosphere as a result of compression of the vapor headspace in the tank during filling of the tank to its design capacity. NR 665.1085(8)(b)(b) Equip all tank openings with closure devices designed to operate with no detectable organic emissions determined using the procedure in s. NR 665.1084 (4). NR 665.1085(8)(c)(c) Whenever hazardous waste is in the tank, operate the tank as a closed system that does not vent to the atmosphere except under any of the following conditions: NR 665.1085(8)(c)2.2. At those times when purging of inerts from the tank is required and the purge stream is routed to a closed-vent system and control device designed and operated according to s. NR 665.1088. NR 665.1085(9)(9) The owner or operator who controls air pollutant emissions by using an enclosure vented through a closed-vent system to an enclosed combustion control device shall meet all of the following requirements: NR 665.1085(9)(a)(a) Locate the tank inside an enclosure. Design and operate the enclosure according to the criteria for a permanent total enclosure in Method 204—“Criteria for and Verification of a Permanent or Temporary Total Enclosure” of appendix M of 40 CFR part 51, incorporated by reference in s. NR 660.11. 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 means; entry of permanent mechanical or electrical equipment or direct airflow into the enclosure. Perform the verification procedure for the enclosure in Section 8 of Method 204 initially when the enclosure is first installed and, thereafter, annually. NR 665.1085(9)(b)(b) Vent the enclosure through a closed-vent system to an enclosed combustion control device that is designed and operated according to the standards for a vapor incinerator, boiler or process heater in s. NR 665.1088. NR 665.1085(9)(c)(c) Safety devices, as defined in s. NR 665.1081, may be installed and operated as necessary on any enclosure, closed-vent system or control device used to comply with pars. (a) and (b). NR 665.1085(10)(10) The owner or operator shall transfer hazardous waste to a tank subject to this section according to all of the following requirements: NR 665.1085(10)(a)(a) Except as provided in par. (b), transfer hazardous waste to the tank from another tank subject to this section or from a surface impoundment subject to s. NR 665.1086 using continuous hard-piping or another closed system that does not allow exposure of the hazardous waste to the atmosphere. For the purpose of complying with this paragraph, an individual drain system is a closed system when it meets 40 CFR part 63, subpart RR—National Emission Standards for Individual Drain Systems.