Chapter NR 468

NR 468.20(2)(hm) (hm) “Dryer” means a machine used to remove perchloroethylene from articles by tumbling them in a heated air stream (see reclaimer).

NR 468.20(2)(i) (i) “Dry-to-dry machine” means a one-machine dry cleaning operation in which washing and drying are performed in the same machine.

NR 468.20(2)(im) (im) “Equivalent control device” means an equivalent emission control technology as determined by the administrator.

NR 468.20 Note Note: The procedure for making this determination is found under 40 CFR 63.325 as in effect on July 1, 1994.

NR 468.20(2)(j) (j) “Exhaust damper” means a flow control device that prevents the air-perchloroethylene gas-vapor stream from exiting the dry cleaning machine into a carbon adsorber before room air is drawn into the dry cleaning machine.

NR 468.20(2)(jm) (jm) “Existing” means a dry cleaning system on which construction or reconstruction commenced before December 9, 1991.

NR 468.20(2)(k) (k) “Filter” means a porous device through which perchloroethylene is passed to remove contaminants in suspension. Examples include, but are not limited to, lint filter (button trap), cartridge filter, tubular filter, regenerative filter, prefilter, polishing filter and spin disc filter.

NR 468.20(2)(km) (km) “Heating coil” means the device used to heat the air stream circulated from the dry cleaning machine drum, after perchloroethylene has been condensed from the air stream and before the stream reenters the dry cleaning machine drum.

NR 468.20(2)(L) (L) “Major source” means any dry cleaning facility that meets the conditions of sub. (1) (g).

NR 468.20(2)(Lm) (Lm) “Muck cooker” means a device for heating perchloroethylene-laden waste material to volatilize and recover perchloroethylene.

NR 468.20(2)(m) (m) “New” means a dry cleaning system on which construction or reconstruction commenced on or after December 9, 1991.

NR 468.20(2)(mm) (mm) “Perceptible leaks” mean any perchloroethylene vapor or liquid leaks that are obvious from any of the following:

NR 468.20(2)(mm)1. 1. The odor of perchloroethylene.

NR 468.20(2)(mm)2. 2. Visual observation, such as pools or droplets of liquid.

NR 468.20(2)(mm)3. 3. The detection of gas flow by passing the fingers over the surface of equipment.

NR 468.20(2)(n) (n) “Perchloroethylene consumption” means the total volume of perchloroethylene purchased based upon purchase receipts or other reliable measures.

NR 468.20(2)(nm) (nm) “Reclaimer” means a machine used to remove perchloroethylene from articles by tumbling them in a heated air stream (see dryer).

NR 468.20(2)(o) (o) “Reconstruction”, for purposes of this section, means replacement of a washer, dryer, or reclaimer; or replacement of any components of a dry cleaning system to such an extent that the fixed capital cost of the new components exceeds 50% of the fixed capital cost that would be required to construct a comparable new source.

NR 468.20(2)(om) (om) “Refrigerated condenser” means a vapor recovery system into which an air-perchloroethylene gas-vapor stream is routed and the perchloroethylene is condensed by cooling the gas-vapor stream.

NR 468.20(2)(p) (p) “Refrigerated condenser coil” means the coil containing the chilled liquid used to cool and condense the perchloroethylene.

NR 468.20(2)(pm) (pm) “Room enclosure” means a stationary structure that encloses a transfer machine system, and is vented to a carbon adsorber or an equivalent control device during operation of the transfer machine system.

NR 468.20(2)(q) (q) “Source”, for purposes of this section, means each dry cleaning system.

NR 468.20(2)(qm) (qm) “Still” means any device used to volatilize and recover perchloroethylene from contaminated perchloroethylene.

NR 468.20(2)(r) (r) “Transfer machine system” means a multiple-machine dry cleaning operation in which washing and drying are performed in different machines. Examples include, but are not limited to:

NR 468.20(2)(r)1. 1. A washer and dryers.

NR 468.20(2)(r)2. 2. A washer and reclaimers.

NR 468.20(2)(r)3. 3. A dry-to-dry machine and reclaimers.

NR 468.20(2)(rm) (rm) “Washer” means a machine used to clean articles by immersing them in perchloroethylene. This includes a dry-to-dry machine when used with a reclaimer.

NR 468.20(2)(s) (s) “Water separator” means any device used to recover perchloroethylene from a water-perchloroethylene mixture.

NR 468.20(3) (3) Standards.

NR 468.20(3)(a) (a) The owner or operator of each existing dry cleaning system shall comply with either subd. 1. or 2. and shall comply with subd. 3. if applicable.

NR 468.20(3)(a)1. 1. Route the air-perchloroethylene gas-vapor stream contained within each dry cleaning machine through a refrigerated condenser or an equivalent control device.

NR 468.20(3)(a)2. 2. Route the air-perchloroethylene gas-vapor stream contained within each dry cleaning machine through a carbon adsorber installed on the dry cleaning machine prior to September 22, 1993.

NR 468.20(3)(a)3. 3. Contain the dry cleaning machine inside a room enclosure if the dry cleaning machine is a transfer machine system located at a major source. Each room enclosure shall be constructed of materials impermeable to perchloroethylene and designed and operated to maintain a negative pressure at each opening at all times that the machine is operating.

NR 468.20(3)(b) (b) The owner or operator of each new dry cleaning system shall do all of the following:

NR 468.20(3)(b)1. 1. Route the air-perchloroethylene gas-vapor stream contained within each dry cleaning machine through a refrigerated condenser or an equivalent control device.

NR 468.20(3)(b)2. 2. Eliminate any emission of perchloroethylene during the transfer of articles between the washer and dryers.

NR 468.20 Note Note: Subdivision 2., in effect, prohibits the installation of transfer machine systems because such systems normally cannot meet this provision.

NR 468.20(3)(b)3. 3. Pass the air-perchloroethylene gas-vapor stream from inside the dry cleaning machine drum through a carbon adsorber or equivalent control device immediately before or as the door of the dry cleaning machine is opened if the dry cleaning machine is located at a major source.

NR 468.20(3)(c) (c) The owner or operator shall close the door of each dry cleaning machine immediately after transferring articles to or from the machine, and shall keep the door closed at all other times.

NR 468.20(3)(d) (d) The owner or operator of each dry cleaning system shall operate and maintain the system according to the manufacturers’ specifications and recommendations.

NR 468.20(3)(e) (e) Each refrigerated condenser used for the purposes of complying with par. (a) or (b) and installed on a dry-to-dry machine, dryer or reclaimer shall be all of the following:

NR 468.20(3)(e)1. 1. Operated to not vent or release the air-perchloroethylene gas-vapor stream contained within the dry cleaning machine to the atmosphere while the dry cleaning machine drum is rotating.

NR 468.20(3)(e)2. 2. Monitored according to sub. (4) (a) 1.

NR 468.20(3)(e)3. 3. Operated with a diverter valve, which prevents air drawn into the dry cleaning machine when the door of the machine is open from passing through the refrigerated condenser.

NR 468.20(3)(f) (f) Each refrigerated condenser used for the purpose of complying with par. (a) and installed on a washer shall comply with all of the following requirements:

NR 468.20(3)(f)1. 1. It shall be operated to not vent the air-perchloroethylene gas-vapor contained within the washer to the atmosphere until the washer door is opened.

NR 468.20(3)(f)2. 2. It shall be monitored according to sub. (4) (a) 2.

NR 468.20(3)(f)3. 3. It may not use the same refrigerated condenser coil for the washer that is used by a dry-to-dry machine, dryer or reclaimer.

NR 468.20(3)(g) (g) Each carbon adsorber used for the purposes of complying with par. (a) or (b) shall meet all of the following requirements:

NR 468.20(3)(g)1. 1. It may not be bypassed to vent or release any air-perchloroethylene gas-vapor stream to the atmosphere at any time.

NR 468.20(3)(g)2. 2. It shall be monitored according to the applicable requirements in sub. (4) (b) or (c).

NR 468.20(3)(h) (h) Each room enclosure used for the purposes of complying with par. (a) 3. shall meet all of the following requirements:

NR 468.20(3)(h)1. 1. It shall be operated to vent all air from the room enclosure through a carbon adsorber or an equivalent control device.

NR 468.20(3)(h)2. 2. It shall be equipped with a carbon adsorber that is not the same carbon adsorber used to comply with par. (a) 2. or (b) 3.

NR 468.20(3)(i) (i) The owner or operator of an affected facility shall drain all cartridge filters in their housing, or other sealed container, for a minimum of 24 hours, or shall treat such filters in an equivalent manner, before removal from the dry cleaning facility.

NR 468.20(3)(j) (j) The owner or operator of an affected facility shall store all perchloroethylene and wastes that contain perchloroethylene in solvent tanks or solvent containers with no perceptible leaks.

NR 468.20(3)(k) (k) Except as provided in par. (L), the owner or operator of a dry cleaning system shall inspect all of the following components weekly for perceptible leaks while the dry cleaning system is operating:

NR 468.20(3)(k)1. 1. Hose and pipe connections, fittings, couplings and valves.

NR 468.20(3)(k)2. 2. Door gaskets and seatings.

NR 468.20(3)(k)3. 3. Filter gaskets and seatings.

NR 468.20(3)(k)4. 4. Pumps.

NR 468.20(3)(k)5. 5. Solvent tanks and containers.

NR 468.20(3)(k)6. 6. Water separators.

NR 468.20(3)(k)7. 7. Muck cookers.

NR 468.20(3)(k)8. 8. Stills.

NR 468.20(3)(k)9. 9. Exhaust dampers.

NR 468.20(3)(k)10. 10. Diverter valves.

NR 468.20(3)(k)11. 11. Cartridge filter housings.

NR 468.20(3)(L) (L) The owner or operator of a dry cleaning facility with a total facility consumption below the applicable consumption levels of sub. (1) (d) or (e) shall inspect the components listed in par. (k) biweekly for perceptible leaks while the dry cleaning system is operating.

NR 468.20(3)(m) (m)

NR 468.20(3)(m)1. 1. Except as provided under subd. 2., the owner or operator of a dry cleaning system shall repair all perceptible leaks detected under par. (k) or (L) within 24 hours.

NR 468.20(3)(m)2. 2. If repair parts must be ordered, either a written or verbal order for those parts shall be initiated within 2 working days of detecting such a leak. Such repair parts shall be installed within 5 working days after receipt.

NR 468.20(3)(n) (n) If parameter values monitored under par. (e), (f) or (g) do not meet the values specified in sub. (4) (a), (b) or (c), adjustments or repairs shall be made to the dry cleaning system or control device to meet those values. If repair parts must be ordered, either a written or verbal order for such parts shall be initiated within 2 working days of detecting such a parameter value. Such repair parts shall be installed within 5 working days after receipt.

NR 468.20(4) (4) Test methods and monitoring.

NR 468.20(4)(a) (a) When a refrigerated condenser is used to comply with sub. (3) (a) 1. or (b) 1., the owner or operator shall:

NR 468.20(4)(a)1. 1. Measure the temperature of the air-perchloroethylene gas-vapor stream on the outlet side of the refrigerated condenser on a dry-to-dry machine, dryer, or reclaimer weekly with a temperature sensor to determine if it is equal to or less than 7.2°C (45°F). The temperature sensor shall be used according to the manufacturer’s instructions and shall be designed to measure a temperature of 7.2°C (45°F) to an accuracy of + 1.1°C (+ 2°F).

NR 468.20(4)(a)2. 2. Calculate the difference between the temperature of the air-perchloroethylene gas-vapor stream entering the refrigerated condenser on a washer and the temperature of the air-perchloroethylene gas-vapor stream exiting the refrigerated condenser on the washer weekly to determine that the difference is greater than or equal to 11.1°C (20°F).

NR 468.20(4)(a)2.a. a. Measurements of the inlet and outlet streams shall be made with a temperature sensor. Each temperature sensor shall be used according to the manufacturer’s instructions, and designed to measure at least a temperature range from 0°C (32°F) to 48.9°C (120°F) to an accuracy of +1.1°C (+2°F).

NR 468.20(4)(a)2.b. b. The difference between the inlet and outlet temperatures shall be calculated weekly from the measured values.

NR 468.20(4)(b) (b) When a carbon adsorber is used to comply with sub. (3) (a) 2. or exhaust is passed through a carbon adsorber immediately upon machine door opening to comply with sub. (3) (b) 3., the owner or operator shall measure the concentration of perchloroethylene in the exhaust of the carbon adsorber weekly with a colorimetric detector tube, while the dry cleaning machine is venting to that carbon adsorber at the end of the last dry cleaning cycle prior to desorption of that carbon adsorber to determine that the perchloroethylene concentration in the exhaust is equal to or less than 100 parts per million by volume. The owner or operator shall do all of the following:

NR 468.20(4)(b)1. 1. Use a colorimetric detector tube designed to measure a concentration of 100 parts per million by volume of perchloroethylene in air to an accuracy of +25 parts per million by volume.

NR 468.20(4)(b)2. 2. Use the colorimetric detector tube according to the manufacturer’s instructions.

NR 468.20(4)(b)3. 3. Provide a sampling port for monitoring within the exhaust outlet of the carbon adsorber that is easily accessible and located at least 8 stack or duct diameters downstream from any flow disturbance such as a bend, expansion, contraction or outlet; that is downstream from no other inlet; and that is 2 stack or duct diameters upstream from any flow disturbance such as a bend, expansion, contraction, inlet or outlet.

NR 468.20(4)(c) (c) If the air-perchloroethylene gas-vapor stream is passed through a carbon adsorber prior to machine door opening to comply with sub. (3) (b) 3., the owner or operator of an affected facility shall measure the concentration of perchloroethylene in the dry cleaning machine drum at the end of the dry cleaning cycle weekly with a colorimetric detector tube to determine that the perchloroethylene concentration is equal to or less than 300 parts per million by volume. The owner or operator shall do all of the following:

NR 468.20(4)(c)1. 1. Use a colorimetric detector tube designed to measure a concentration of 300 parts per million by volume of perchloroethylene in air to an accuracy of +75 parts per million by volume.

NR 468.20(4)(c)2. 2. Use the colorimetric detector tube according to the manufacturer’s instructions.

NR 468.20(4)(c)3. 3. Conduct the weekly monitoring by inserting the colorimetric detector tube into the open space above the articles at the rear of the dry cleaning machine drum immediately upon opening the dry cleaning machine door.

NR 468.20(4)(d) (d) When calculating yearly perchloroethylene consumption for the purpose of demonstrating applicability according to sub. (1), the owner or operator shall perform the following calculation on the first day of every month: