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Mine 2004 SPCC <br />• as well as to storage capacity contained in tanks. Further definition and additional justification <br />for this determination is found on page 47066 of the same Federal Register where it states that <br />"You need only count containers of 55 gallons or greater in the calculation of the regulatory <br />threshold" <br />Various types of mobile equipment containing greater than 55 gallons of oil aze used at the site. <br />Table 2 (pages 1, 2, and 3 of 4) provides a list of the types of equipment and tank capacities for <br />the equipment. Mobile equipment operates throughout the site; therefore, there is no specific <br />map designation for the location of such equipment on Figure 2. <br />4.9.1 Oil Inventory <br />The total quantity of oil within mobile equipment at the site is approximately 25,000 gallons. <br />This includes any fuel tanks, hydraulic fluid oil tanks, or other oil storage on the vehicle greater <br />than 55-gallons. Table 2 provides a breakdown for each piece of equipment. <br />4.9.2 Containment and Diversionary Structures <br />The most likely amount of fuel or oil spilled from mobile equipment is on the order of 1 to 50 <br />gallons. Atypical spill might involve a hydraulic line break, and this could occw anywhere on <br />• the site. Flow direction is even more dependent on where the line break or spill occws. In the <br />unlikely event that a tank should completely ruptwe the oil inside would report to the ground <br />surrounding the unit. Runoff from Trapper Mine's permitted areas is contained with stormwater <br />basins and sediment ponds that are designated CDPS discharge points under the NPDES <br />program. Any oil would likely be contained within the soil adjacent to the equipment. In the <br />unlikely event oil would flow outside the immediate azea of the transformers, it would likely be <br />captured within one of the sediment ponds or CDPS basins, where it could be contained with <br />sorbent booms. <br />In the Preamble to 40 CFR Part 112 as given in the Federal Register, July 17, 2002, pages <br />47054-5, it states: "Facilities that use oil operationally include electrical substations, facilities <br />containing electrical transformers, and certain hydraulic or manufacturing equipment. The <br />requirements for bulk storage containers may not always apply to these facilities.... Facilities <br />with equipment containing oil for ancillary purposes are not required to provide the secondary <br />containment required jor bulk storage facilities (§112.8(c))." Based on the preceding <br />regulatory discussion, secondary containment is not required for mobile operating equipment. <br />"The general requirement for secondary containment, which can be provided by various means <br />• including drainage systems, spill diversion ponds, etc., will provide for safety and also meet the <br />needs of Section 311 (j)1(c) of the CWA" according to the discussion on page 47055 of the July <br />14 <br />