NR 440.70(10)(10) Alternative standards for individual drain systems. NR 440.70(10)(a)(a) An owner or operator may elect to construct and operate a completely closed drain system. NR 440.70(10)(b)(b) Each completely closed drain system shall be equipped and operated with a closed vent system and control device complying with the requirements of sub. (7). NR 440.70(10)(c)(c) An owner or operator shall notify the department in the report required in s. NR 440.07 that the owner or operator has elected to construct and operate a completely closed drain system. NR 440.70(10)(d)(d) If the owner or operator elects to comply with the provisions of this subsection, then the owner or operator does not need to comply with the provisions of sub. (4) or (11) (j) note. NR 440.70(10)(e)(e) Sewer lines may not be open to the atmosphere and shall be covered or enclosed in a manner so as to have no visual gaps or cracks in joints, seals or other emission interfaces. NR 440.70(10)(f)(f) The portion of each unburied sewer line shall be visually inspected initially and semiannually thereafter for indication of cracks, gaps or other problems that could result in VOC emissions. NR 440.70(10)(g)(g) Whenever cracks, gaps or other problems are detected, repairs shall be made as soon as practicable, but not later than 15 calendar days after identification, except as provided in sub. (8). NR 440.70(11)(11) Alternative standards for oil-water separators. NR 440.70(11)(a)(a) An owner or operator may elect to construct and operate a floating roof on an oil-water separator tank, slop oil tank, storage vessel or other auxiliary equipment subject to the requirements of this section which meets the following specifications. NR 440.70(11)(a)1.1. Each floating roof shall be equipped with a closure device between the wall of the separator and the roof edge. The closure device is to consist of a primary seal and a secondary seal. NR 440.70(11)(a)2.2. The primary seal shall be a liquid-mounted seal or a mechanic shoe seal. NR 440.70(11)(a)3.3. A liquid-mounted seal means a foam or liquid-filled seal mounted in contact with the liquid between the wall of the separator and the floating roof. A mechanical shoe seal means a metal sheet held vertically against the wall of the separator by springs or weighted levers and connected by braces to the floating roof. A flexible coated fabric or envelope spans the annular space between the metal sheet and the floating roof. NR 440.70(11)(a)4.4. The gap width between the primary seal and the separator wall may not exceed 3.8 cm (1.5 in.) at any point. NR 440.70(11)(a)5.5. The total gap area between the primary seal and the separator wall may not exceed 67 cm2/m (3.2 in2/ft) of separator wall perimeter. NR 440.70(11)(a)6.6. The secondary seal shall be above the primarily seal and cover the annular space between the floating roof and the wall of the separator. NR 440.70(11)(a)7.7. The gap width between the secondary seal and the separator wall may not exceed 1.3 cm (0.5 in.) at any point. NR 440.70(11)(a)8.8. The total gap area between the secondary seal and the separator wall may not exceed 6.7 cm2/m (0.32 in2/ft) of separator wall perimeter. NR 440.70(11)(b)(b) The maximum gap width and total gap area shall be determined by the methods and procedures specified in sub. (14) (d). NR 440.70(11)(b)1.1. Measurement of primary seal gaps shall be performed within 60 calendar days after initial installation of the floating roof and introduction of refinery wastewater and once every 5 years thereafter. NR 440.70(11)(b)2.2. Measurement of secondary seal gaps shall be performed within 60 calendar days of initial introduction of refinery wastewater and once every year thereafter. NR 440.70(11)(c)(c) The owner or operator shall make necessary repairs within 30 calendar days of identification of seals not meeting the requirements listed in par. (a) 2. and 6. NR 440.70(11)(d)(d) Except as provided in par. (f), each opening in the roof shall be equipped with a gasketed cover, seal or lid, which shall be maintained in a closed position at all times, except during inspection and maintenance. NR 440.70(11)(e)(e) The roof shall be floating on the liquid, that is, off the roof supports, at all times except during abnormal conditions, that is, low flow rate. NR 440.70(11)(f)(f) The floating roof may be equipped with one or more emergency roof drains for removal of stormwater. Each emergency roof drain shall be fitted with a slotted membrane fabric cover that covers at least 90% of the drain opening area or a flexible fabric sleeve seal. NR 440.70(11)(g)(g) Access doors and other openings shall be visually inspected initially and semiannually thereafter to ensure that there is a tight fit around the edges and to identify other problems that could result in VOC emissions. NR 440.70(11)(g)1.1. When a broken seal or gasket on an access door or other opening is identified, it shall be repaired as soon as practicable, but not later than 30 calendar days after it is identified, except as provided in sub. (8). NR 440.70(11)(h)(h) An owner or operator shall notify the department in the report required by s. NR 440.07 that the owner or operator has elected to construct and operate a floating roof under pars. (a) to (g). NR 440.70(11)(i)(i) For portions of the oil-water separator tank where it is infeasible to construct and operate a floating roof, such as the skimmer mechanism and weirs, a fixed roof meeting the requirements of sub. (5) (a) shall be installed.