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: