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. NR 440.70(11)(j)(j) Except as provided in par. (i), if an 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. (5) or 40 CFR 60.694 applicable to the same facilities. NR 440.70 NoteNote: Under 40 CFR 60.694, if, in the administrator’s judgment, an alternative means of emission limitation will achieve a reduction in VOC emissions at least equivalent to the reduction in VOC emissions achieved by the applicable requirement in subs. (3) to (9), the administrator will publish in the Federal Register a notice permitting the use of the alterative means for purposes of compliance with that requirement. The notice may condition the permission on requirements related to the operation and maintenance of the alternative means. Any such notice shall be published only after notice and an opportunity for a hearing. Any person seeking permission under 40 CFR 60.694 shall collect, verify and submit to the administrator information showing that the alterative means achieves equivalent emission reductions. NR 440.70(13)(a)(a) Each owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate according to manufacturer’s specifications the following equipment, unless alternative monitoring procedures or requirements are approved for that facility by the department. NR 440.70(13)(a)1.1. Where a thermal incinerator is used for VOC emission reduction, a temperature monitoring device equipped with a continuous recorder shall be used to measure the temperature of the gas stream in the combustion zone of the incinerator. The temperature monitoring device shall have an accuracy of ± 1% of the temperature being measured, expressed in °C, or ± 0.5°C (0.9°F), whichever is greater. NR 440.70(13)(a)2.2. Where a catalytic incinerator is used for VOC emission reduction, temperature monitoring devices, each equipped with a continuous recorder, shall be used to measure the temperature in the gas stream immediately before and after the catalyst bed of the incinerator. The temperature monitoring devices shall have an accuracy of ±1% of the temperature being measured, expressed in °C, or ± 0.5°C (0.9°F), whichever is greater. NR 440.70(13)(a)3.3. Where a carbon absorber is used for VOC emissions reduction, monitoring is required as follows: NR 440.70(13)(a)3.a.a. For a carbon adsorption system that regenerates the carbon bed directly onsite, a monitoring device that continuously indicates and records the VOC concentration level or reading of organics in the exhaust gases of the control device outlet gas stream or inlet and outlet gas stream shall be used. NR 440.70(13)(a)3.b.b. For a carbon adsorption system that does not regenerate the carbon bed directly onsite in the control device, e.g., a carbon canister, the concentration level of the organic compounds in the exhaust vent stream from the carbon adsorption system shall be monitored on a regular schedule, and the existing carbon shall be replaced with fresh carbon immediately when carbon breakthrough is indicated. The device shall be monitored on a daily basis or at intervals no greater than 20% of the design carbon replacement interval, whichever is greater. As an alternative to conducting this monitoring, an owner or operator may replace the carbon in the carbon adsorption system with fresh carbon at a regular predetermined time interval that is less than the carbon replacement interval that is determined by the maximum design flow rate and organic concentration in the gas stream vented to the carbon adsorption system. NR 440.70(13)(b)(b) Where a VOC recovery device other than a carbon absorber is used to meet the requirements specified in sub. (7) (a), the owner or operator shall provide to the department information describing the operation of the control device and the process parameters that would indicate proper operation and maintenance of the device. The department may request further information and will specify appropriate monitoring procedures or requirements. NR 440.70(13)(c)(c) An alternative operational or process parameter may be monitored if it can be demonstrated that another parameter will ensure that the control device is operated in conformance with these standards and the control device’s design specifications. NR 440.70(14)(14) Performance test methods and procedures and compliance provisions. NR 440.70(14)(a)(a) Before using any equipment installed in compliance with the requirements of sub. (4), (5), (6), (7), (10) or (11), the owner or operator shall inspect the equipment for indications of potential emissions, defects or other problems that may cause the requirements of this section not to be met. Points of inspection shall include, but are not limited to, seals, flanges, joints, gaskets, hatches, caps and plugs.