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` ' • Secondary containment calculations are provided in Appendix B and manufacturer specifications are provided in Appendix C. 2.3 Piping Waste Antifreeze and Used Oil from salvaged vehicles is gravity drained into their associated tanks located in the aboveground secondary containments, as previously described. Because of the nature of the operation,the drain racks are configured with drain pans attached to articulated arms for positioning as needed to receive Used Oil and Waste Antifreeze as it is drained from the vehicles. This necessitates the use of flexible piping at the joints of the articulated arms. The remaining piping on the arms is steel. The drain rack piping directs the fluids to polyvinyl chloride (PVC) piping that extends from the drain racks to the storage tanks within the secondary containments. The concrete floor provides secondary containment for the piping; however,the floor does not appear to have been constructed to drain inward. Significant spills from piping near the perimeter of the concrete have to potential to flow out of the drain building. Gasoline from salvaged vehicles is initially gravity drained from the vehicle to the Sump Tank to where it is evaluated and segregated into Waste Gasoline or Reclaimed Gasoline based on color and odor. Waste Gasoline is gravity drained from the Sump Tank into appropriate steel containers and transferred to drums stored on containment pallets. Reclaimed Gasoline is transferred to the Reclaimed Gasoline tank using a double diaphragm pump through a combination of flex and rigid steel piping.Similar to Used Oil and Waste Antifreeze,the gasoline drain is configured with a drain pan attached to an articulated arm using flex piping to collect and transfer gasoline as it is drained from the vehicles. A combination of steel and flex piping is used from the sump tank "bread box" through the double diaphragm pump to the sock filter. From the sock filter steel and flex piping is used to the tank selector valve and subsequently steel piping where the Reclaimed Gasoline is directed into the double walled tanks. There is additional flex piping when fuel is again drained directly from a vehicle using the double diaphragm pump then pumped to the steel manifold. The concrete floor within the drain building provides secondary containment for piping indoors and the concrete floor and berm provide secondary containment for the piping outdoors. Details of tank piping are provided in Table 2. Example pictures of the drain racks and associated piping are provided in Appendix A. s 'r `J D Hazardous Waste Tank Assessment DEC 0 0 2016 Stockton,CA Auto Parts Group—Pick-N-Pull 4 Project No.04.20160002 ENVIRONMENTAL HEALTH DEPARTMENT