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Appendix G <br /> Secondary Containment Calculations <br /> Secondary Containment Calculations <br /> Secondary containment structures are located indoors or under canopy and are not exposed to <br /> storm water. <br /> Diesel Fuel Tank <br /> The ASTs on the fuel tank pad are double-walled and therefore meet the SPCC containment <br /> requirement. <br /> Motor and Hydraulic Oil Containment (Service Pit) <br /> Containment = 65 ft (L) x 4 ft (W) x 4 ft (H) = 1,040 ft3 = 7,780 gallons <br /> Displacement = One 55-gallon drum <br /> Net Containment Capacity = 7,780 — 55 = 7,725 gallons <br /> Used Oil Containment <br /> Containment = 6.0625 ft (L) x 2.67 ft (W) x 2.67 ft (H) = 43.1 ft3 = 323 gallons <br /> Displacement = 4 supporting legs x Tr(0.083)2 x 0.5 ft = 0.044 ft3 = 3.25 gallons <br /> Net Containment Capacity = 323 — 3.25 = 319.75 gallons <br /> The use oil storage area is covered, so collection of precipitation is not anticipated within the <br /> containment area. The single largest capacity container within this containment is 323 gallons. <br /> Based on the prescribed requirements, this containment volume satisfies the SPCC containment <br /> requirement. <br /> Concrete Recycling Unit <br /> Containment 12 ft (L) x 13 ft (W) x 20 ft (H) = 43.1 ft3 = 23,340 gallons <br /> Displacement = Assume recycling unit is half full during regular operations <br /> Rainfall = 12 ft (L) x 13 ft (W) * 0.75 in rain = 9.75 cf= 73 gallons <br /> Net Containment Capacity = 23,340 — 11,670 — 73 gallons = 11,687 gallons <br /> The Concrete Recycling Unit has sufficient capacity to contain the spill should the 390-gallon <br /> transformer fail with all material flowing to the Recycling Unit. <br />