NR 665.1085(12)(12)Following the initial inspection and monitoring of the cover as required by the applicable provisions of this subchapter, subsequent inspection and monitoring may be performed at intervals longer than one year under the following special conditions:
NR 665.1085(12)(a)(a) In the case when inspecting or monitoring the cover would expose a worker to dangerous, hazardous or other unsafe conditions, the owner or operator may designate a cover as an “unsafe to inspect and monitor cover” and comply with all of the following requirements:
NR 665.1085(12)(a)1.1. Prepare a written explanation for the cover stating the reasons why the cover is unsafe to visually inspect or to monitor, if required.
NR 665.1085(12)(a)2.2. Develop and implement a written plan and schedule to inspect and monitor the cover, using the procedures specified in the applicable section of this subchapter, as frequently as practicable during those times when a worker can safely access the cover.
NR 665.1085(12)(b)(b) In the case when a tank is buried partially or entirely underground, inspect and monitor, as required by the applicable provisions of this section, only those portions of the tank cover and those connections to the tank (e.g., fill ports, access hatches, gauge wells, etc.) that are located on or above the ground surface.
NR 665.1085 HistoryHistory: CR 05-032: cr. Register July 2006 No. 607, eff. 8-1-06.
NR 665.1086NR 665.1086Standards: surface impoundments.
NR 665.1086(1)(1)This section applies to the control of air pollutant emissions from surface impoundments for which s. NR 665.1083 (2) references the use of this section for the air emission control.
NR 665.1086(2)(2)The owner or operator shall control air pollutant emissions from the surface impoundment by installing and operating any of the following:
NR 665.1086(2)(a)(a) A floating membrane cover according to sub. (3).
NR 665.1086(2)(b)(b) A cover that is vented through a closed-vent system to a control device according to sub. (4).
NR 665.1086(3)(3)The owner or operator who controls air pollutant emissions from a surface impoundment using a floating membrane cover shall meet all of the following requirements:
NR 665.1086(3)(a)(a) Equip the surface impoundment with a floating membrane cover designed to meet all of the following specifications:
NR 665.1086(3)(a)1.1. Design the floating membrane cover to float on the liquid surface during normal operations and form a continuous barrier over the entire surface area of the liquid.
NR 665.1086(3)(a)2.2. Fabricate the cover from a synthetic membrane material that is any of the following:
NR 665.1086(3)(a)2.a.a. High density polyethylene (HDPE) with a thickness no less than 2.5 millimeters (mm).
NR 665.1086(3)(a)2.b.b. A material or a composite of different materials determined to have both organic permeability properties that are equivalent to those of the material listed in subd. 2. a. and chemical and physical properties that maintain the material integrity for the intended service life of the material.
NR 665.1086(3)(a)3.3. Install the cover in a manner such that there are no visible cracks, holes, gaps or other open spaces between cover section seams or between the interface of the cover edge and its foundation mountings.
NR 665.1086(3)(a)4.4. Except as provided for in subd. 5., equip each opening in the floating membrane cover with a closure device 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.
NR 665.1086(3)(a)5.5. The floating membrane cover may be equipped with one or more emergency cover drains for removal of stormwater. Equip each emergency cover drain with a slotted membrane fabric cover that covers at least 90 percent of the area of the opening or a flexible fabric sleeve seal.
NR 665.1086(3)(a)6.6. Make the closure devices of suitable materials that will minimize exposure of the hazardous waste to the atmosphere, to the extent practical, and will maintain the integrity of the closure devices throughout their intended service life. Factors to consider when selecting the materials of construction and designing the cover and closure devices shall include organic vapor permeability, the effects of any contact with the liquid and its vapor managed in the surface impoundment, the effects of outdoor exposure to wind, moisture and sunlight and the operating practices used for the surface impoundment on which the floating membrane cover is installed.
NR 665.1086(3)(b)(b) Whenever hazardous waste is in the surface impoundment, float the floating membrane cover on the liquid and secure each closure device in the closed position except as follows:
NR 665.1086(3)(b)1.1. Opening of closure devices or removal of the cover is allowed at the following times:
NR 665.1086(3)(b)1.a.a. To provide access to the surface impoundment for performing routine inspection, maintenance or other activities needed for normal operations. Examples of those activities include those times when a worker needs to open a port to sample the liquid in the surface impoundment, or when a worker needs to open a hatch to maintain or repair equipment. After completing the activity, promptly replace the cover and secure the closure device in the closed position, as applicable.
NR 665.1086(3)(b)1.b.b. To remove accumulated sludge or other residues from the bottom of the surface impoundment.
NR 665.1086(3)(b)2.2. Opening of a safety device, as defined in s. NR 665.1081, is allowed at any time conditions require doing so to avoid an unsafe condition.
NR 665.1086(3)(c)(c) Inspect the floating membrane cover according to all of the following procedures:
NR 665.1086(3)(c)1.1. Visually inspect the floating membrane cover and its closure devices to check for defects that could result in air pollutant emissions. Defects include, but are not limited to, visible cracks, holes or gaps in the cover section seams or between the interface of the cover edge and its foundation mountings; broken, cracked or otherwise damaged seals or gaskets on closure devices and broken or missing hatches, access covers, caps or other closure devices.
NR 665.1086(3)(c)2.2. Perform an initial inspection of the floating membrane cover and its closure devices on or before the date that the surface impoundment becomes subject to this section. Thereafter, perform the inspections at least once every year except for the special conditions provided for in sub. (7).