NR 661.1084(6)(c)3.a.a. Prior to each inspection to measure external floating roof seal gaps as required under subd. 1., the remanufacturer or other person that stores or treats the hazardous secondary material shall prepare and send written notification so that it is received by the department at least 30 calendar days before the date the measurements are scheduled to be performed.

NR 661.1084(6)(c)3.b.b. Prior to each visual inspection of an external floating roof in a tank that has been emptied and degassed, the remanufacturer or other person that stores or treats the hazardous secondary material shall prepare and send written notification so that it is received by the department at least 30 calendar days before refilling the tank except when an inspection is not planned as provided for in subd. 3. c.

NR 661.1084(6)(c)3.c.c. When a visual inspection is not planned and the remanufacturer or other person that stores or treats the hazardous secondary material could not have known about the inspection 30 calendar days before refilling the tank, the owner or operator shall notify the department as soon as possible, but no later than 7 calendar days before refilling the tank. This notification may be made by telephone and immediately followed by a written explanation for why the inspection is unplanned. Alternatively, written notification, including the explanation for the unplanned inspection, may be sent so that it is received by the department at least 7 calendar days before refilling the tank.

NR 661.1084(6)(d)(d) Safety devices, as defined in s. NR 661.1081, may be installed and operated as necessary on any tank complying with the requirements specified in this subsection.

NR 661.1084(7)(7) The remanufacturer or other person that stores or treats the hazardous secondary material who controls air pollutant emissions from a tank by venting the tank to a control device shall meet all of the following requirements:

NR 661.1084(7)(a)(a) The tank shall be covered by a fixed roof and vented directly through a closed-vent system to a control device in accordance with all of the following requirements:

NR 661.1084(7)(a)2.2. Each opening in the fixed roof not vented to the control device shall be equipped with a closure device. If the pressure in the vapor headspace underneath the fixed roof is less than atmospheric pressure when the control device is operating, the closure devices shall be designed to operate such that when the closure device is secured in the closed position there are no visible cracks, holes, gaps, or other open spaces in the closure device or between the perimeter of the cover opening and the closure device. If the pressure in the vapor headspace underneath the fixed roof is equal to or greater than atmospheric pressure when the control device is operating, the closure device shall be designed to operate with no detectable organic emissions.

NR 661.1084(7)(a)3.3. The fixed roof and its closure devices shall be made of suitable materials that will minimize exposure of the hazardous secondary material to the atmosphere, to the extent practical, and will maintain the integrity of the fixed roof and closure devices throughout their intended service life. Factors to be considered when selecting the materials for and designing the fixed roof and closure devices shall include organic vapor permeability; the effects of any contact with the liquid and its vapor managed in the tank; the effects of outdoor exposure to wind, moisture, and sunlight; and the operating practices used for the tank on which the fixed roof is installed.

NR 661.1084(7)(b)(b) Whenever a hazardous secondary material is in the tank, the fixed roof shall be installed with each closure device secured in the closed position and the vapor headspace underneath the fixed roof vented to the control device except as follows:

NR 661.1084(7)(b)1.a.a. To provide access to the tank for performing routine inspection, maintenance, or other activities needed for normal operations. Examples of such activities include those times when a worker needs to open a port to sample liquid in the tank, or when a worker needs to open a hatch to maintain or repair equipment. Following completion of the activity, the remanufacturer or other person that stores or treats the hazardous secondary material shall promptly secure the closure device in the closed position or reinstall the cover, as applicable, to the tank.

NR 661.1084(7)(c)(c) The remanufacturer or other person that stores or treats the hazardous secondary material shall inspect and monitor the air emission control equipment in accordance with all of the following procedures:

NR 661.1084(7)(c)1.1. The fixed roof and its closure devices shall be visually inspected by the remanufacturer or other person that stores or treats the hazardous secondary material to check for defects that could result in air pollutant emissions. Defects include 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 661.1084(7)(c)2.2. The remanufacturer or other person that stores or treats the hazardous secondary material shall inspect and monitor the closed-vent system and control device in accordance with the procedures specified in s. NR 661.1087.

NR 661.1084(7)(c)3.3. The remanufacturer or other person that stores or treats the hazardous secondary material shall perform an initial inspection of the air emission control equipment on or before the date that the tank becomes subject to this section. Thereafter, the remanufacturer or other person that stores or treats the hazardous secondary material shall perform the inspections at least once every year except for the special conditions provided for in sub. (12).

NR 661.1084(7)(c)4.4. In the event that a defect is detected, the remanufacture or other person that stores or treats the hazardous secondary material shall repair the defect in accordance with the requirements under sub. (11).

NR 661.1084(7)(c)5.5. The remanufacturer or other person that stores or treats the hazardous secondary material shall maintain a record of the inspection in accordance with the requirements specified in s. NR 661.1089 (2).

NR 661.1084(8)(8) The remanufacturer or other person that stores or treats the hazardous secondary material who controls air pollutant emissions by using a pressure tank shall meet all of the following requirements:

NR 661.1084(8)(a)(a) The tank shall be designed not to vent to the atmosphere as a result of compression of the vapor headspace in the tank during filling of the tank to its design capacity.

NR 661.1084(8)(b)(b) All tank openings shall be equipped with closure devices designed to operate with no detectable organic emissions as determined using the procedure specified in s. NR 661.1083 (4).

NR 661.1084(8)(c)(c) Whenever a hazardous secondary material is in the tank, the tank shall be operated as a closed system that does not vent to the atmosphere except under any of the following conditions:

NR 661.1084(8)(c)2.2. At those times when purging of inerts from the tank is required and the purge stream is routed to a closed-vent system and control device designed and operated in accordance with the requirements specified in s. NR 661.1087.

NR 661.1084(9)(9) The remanufacturer or other person that stores or treats the hazardous secondary material who controls air pollutant emissions by using an enclosure vented through a closed-vent system to an enclosed combustion control device shall meet the of the following requirements:

NR 661.1084(9)(a)(a) The tank shall be located inside an enclosure and the enclosure shall be designed and operated in accordance with the criteria for a permanent total enclosure as specified in “Procedure T—Criteria for and Verification of a Permanent or Temporary Total Enclosure” of appendix B of 40 CFR 52.741, incorporated by reference in s. NR 660.11. The enclosure may have permanent or temporary openings to allow worker access; passage of material into or out of the enclosure by conveyor, vehicles, or other mechanical means; entry of permanent mechanical or electrical equipment; or direct airflow into the enclosure. The remanufacturer or other person that stores or treats the hazardous secondary material shall perform the verification procedure for the enclosure as specified in Section 5.0 of “Procedure T—Criteria for and Verification of a Permanent or Temporary Total Enclosure” initially when the enclosure is first installed and, thereafter, annually.