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Containment and Diversionary Structures-40 CFR Part 112.7(c)(1) <br /> Dikes, Berms, or Retaining Walls- 112.7(c)(1)(i) <br /> The majority of the oil storage containers and oil-filled equipment are stored within the <br /> buildings. Containers that are indoors but not equipped with secondary containment are <br /> located in areas of the building such that any release would not leave the building or would <br /> flow to the oil/water separator system. A large volume release, such as a catastrophic release <br /> from the double-walled 1,000-gallon salvage/used oil ASTs,would flow to the cullet water <br /> sump system and be contained there or in the oil/water separator. However,the two (2) <br /> 1,000-gallon salvage/used oil ASTs are double walled tanks which meet the secondary <br /> containment requirements of CFR 112.8(c)(2). <br /> The transformers located south of the furnace building are not provided with secondary <br /> containment. However, there are no active storm sewers located in the immediate vicinity of <br /> the transformers. In addition, the transformers are classified as electrical operating <br /> equipment and are not required to have dedicated secondary containment as long as there is <br /> general containment to prevent a potential release from discharging to surface waters offsite. <br /> The following section describes the secondary containment structures that are present or will <br /> be utilized at the facility. Secondary containment at the facility is evaluated for the largest <br /> tank volume plus sufficient freeboard for precipitation if the tank is located outdoors. <br /> Sufficient freeboard was determined by allowing for the rainfall volume that would occur <br /> during a 25-year, 24-hour storm event(5 inches). <br /> During the site visit,the Professional Engineer observed existing secondary containment <br /> systems. Based on these visual observations,the existing systems appeared to provide <br /> sufficiently impervious containment to allow facility personnel to respond to a release before <br /> it would impact navigable waters. It should be noted that the Professional Engineer did not <br /> test the permeability of these structures. <br /> 1.000-gallon Diesel Fuel AST <br /> A containment berm is constructed around the base of the 1,000-gallon diesel fuel AST. The <br /> floor and walls of the containment consist of concrete and are sufficiently impervious based <br /> upon the construction material and the lack of any visible migration pathways. The gross <br /> containment capacity of the berm is 2,890 gallons, which is sufficient to contain the <br /> maximum volume of the tank and allows sufficient freeboard for precipitation of 5 inches for <br /> the 25-year,24-hour worst rainfall event. <br /> 180-gallon Diesel Fuel AST <br /> A containment berm is constructed around the base of the 180-gallon diesel fuel AST used <br /> for the firewater pump. The floor and walls of the containment consist of concrete and are <br /> sufficiently impervious based upon the construction material and the lack of any visible <br /> migration pathways. The gross containment capacity of the berm is 350 gallons, which is <br /> sufficient to contain the maximum volume of the tank and allows sufficient freeboard for <br /> precipitation of 5 inches for the 25-year, 24-hour worst rainfall event. <br /> 22 May 2017A4SwA-246 <br />