NR 664.1084(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 664.1084(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 664.1084(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 664.1084(3)(d)(d) Inspect the air emission control equipment according to all of the following requirements: NR 664.1084(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 664.1084(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 664.1084(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 664.1084(4)(a)(a) A fixed-roof tank equipped with an internal floating roof according to sub. (5). NR 664.1084(4)(c)(c) A tank vented through a closed-vent system to a control device according to sub. (7). NR 664.1084(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 664.1084(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 664.1084(5)(a)(a) Equip the tank with a fixed roof and an internal floating roof according to all of the following requirements: NR 664.1084(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 664.1084(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 664.1084(5)(a)2.b.b. Two continuous seals mounted one above the other. The lower seal may be a vapor-mounted seal. NR 664.1084(5)(a)3.3. The internal floating roof shall meet all of the following specifications: NR 664.1084(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 664.1084(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 664.1084(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% of the opening. NR 664.1084(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 664.1084(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 664.1084(5)(b)(b) Operate the tank according to all of the following requirements: