NR 419.045(2)(e)2.j.j. Each penetration of the internal floating roof that allows for passage of a ladder shall have a sliding cover fitted with a gasket.

NR 419.045(2)(e)2.k.k. Each penetration of the internal floating roof that allows for passage of a column supporting the fixed roof shall have a flexible fabric sleeve seal or a sliding cover fitted with a gasket.

NR 419.045(2)(e)2.L.L. Each cover or lid on any opening in the internal floating roof shall be closed so that there are no visible gaps, except when the cover or lid must be open for access. Covers on each access hatch and each gauge float well shall be bolted or fastened to be air-tight when they are closed. Rim space vents are to be set to open only when the internal floating roof is not floating or when the pressure beneath the rim seal exceeds the manufacturer’s recommended setting.

NR 419.045(2)(e)3.3. An external floating roof that meets all of the following requirements:

NR 419.045(2)(e)3.a.a. Each external floating roof shall be equipped with a closure device between the wall of the storage vessel and the roof edge. The closure device shall consist of two seals, one above the other. The lower seal (primary seal) shall be either a metallic shoe seal or a liquid-mounted seal. The upper seal (secondary seal) shall be a rim-mounted or shoe-mounted seal.

NR 419.045(2)(e)3.b.b. Except during inspections, both the primary seal and the secondary seal shall completely cover the annular space between the external floating roof and the wall of the storage vessel in a continuous fashion.

NR 419.045(2)(e)3.c.c. Except for automatic bleeder vents (vacuum breaker vents) and rim space vents, each opening in the noncontact external floating roof shall provide a projection below the liquid surface.

NR 419.045(2)(e)3.d.d. Except for automatic bleeder vents, rim space vents, roof drains, and leg sleeves, each opening in the roof shall be equipped with a cover, seal, or lid fitted with a gasket. The cover, seal, or lid shall be maintained in a closed position so there are no visible gaps at all times, except when the cover or lid must be open for access. Covers on each access hatch and each gauge float well shall be bolted or fastened to be air-tight when they are closed.

NR 419.045(2)(e)3.e.e. Automatic bleeder vents shall be closed at all times when the roof is floating, except when the roof is being floated off of, or is being landed on, the roof leg supports.

NR 419.045(2)(e)3.f.f. Rim space vents shall be set to open only when the roof is being floated off of the roof leg supports or when the pressure beneath the rim seal exceeds the manufacturer’s recommended setting.

NR 419.045(2)(e)3.h.h. Each roof drain that empties into the stored liquid shall be provided with a slotted membrane fabric cover that covers at least 90% of the area of the opening.

NR 419.045(2)(e)3.i.i. Each unslotted guide pole well shall have a sliding cover fitted with a gasket or a flexible fabric sleeve seal.

NR 419.045(2)(e)3.j.j. Each unslotted guide pole shall have a cap fitted with a gasket on the end of the pole, which is closed at all times except when gauging the liquid level or taking liquid samples.

NR 419.045(2)(e)3.L.L. Each slotted guide pole shall have a float fitted with a gasket or other device that closes off the liquid surface from the atmosphere.

NR 419.045(2)(e)3.m.m. Each gauge hatch or sample well shall have a cover fitted with a gasket which is closed at all times except when the hatch or well must be open for access.

NR 419.045(2)(e)3.n.n. The external floating roof shall be floating on the liquid surface at all times except when the floating roof must be supported by the leg supports during any period of an initial fill, after the tank has been completely emptied and degassed, or when the tank is completely emptied before being subsequently refilled.

NR 419.045(2)(e)3.o.o. When the floating roof is resting on the leg supports, the process of filling, emptying, or refilling shall be continuous and shall be accomplished as soon as practical.

NR 419.045(2)(f)(f) Treatment processes. For each treatment process managing an affected VOC wastewater stream or an affected residual, the owner or operator shall comply with the requirements as specified in this paragraph. Once an affected VOC wastewater stream or an affected residual has been treated in accordance with the requirements of this paragraph, the affected VOC wastewater stream or the affected residual is no longer subject to the requirements of this subsection.

NR 419.045(2)(f)1.1. Each component of the treatment process shall meet the applicable requirements of pars. (a) to (e).

NR 419.045(2)(f)2.2. Gases vented from a treatment process shall be routed by means of a closed vent system to a control device which is designed and operated to reduce the VOC vented to it by at least 90% by weight. Vents from anaerobic biological treatment processes may be routed through hard-piping to a fuel gas system.

NR 419.045(2)(f)3.3. For each of the affected VOC wastewater streams that are treated in a nonbiological treatment process, or a combination of nonbiological treatment processes, the owner or operator shall, by removal or destruction, reduce the mass flow rate of affected VOC by 90% or more while reducing the affected VOC concentration to less than 1,000 parts per million by weight. Dilution may not be used to achieve compliance with this subdivision. This requirement does not apply to affected wastewater or affected residuals that comply with the requirements for Resource Conservation and Recovery Act (RCRA) (42 USC 6921 to 6939e) treatment options specified in subd. 6.

NR 419.045(2)(f)4.4. The owner or operator using a closed biological treatment process for at least one affected VOC wastewater stream shall reduce the mass flow rate for all affected VOC from all wastewater streams entering the biological treatment process by at least 90%.