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A{�THCON <br />2.3 Piping <br />Waste antifreeze and used oil from salvaged vehicles are gravity drained into their associated tanks <br />located in the aboveground secondary containments, as previously described. Because of the <br />nature of the operation, the drain racks are configured with drain pans attached to articulated arms <br />for positioning as needed to receive used oil and waste antifreeze as they are drained from the <br />vehicles. This necessitates the use of flexible piping at the joints of the articulated arms. The <br />remaining piping on the arms is made of steel. The drain rack piping directs the fluids to polyvinyl <br />chloride (PVC) piping that extends from the drain racks to the storage tanks within the secondary <br />containments. The concrete floor provides secondary containment for the piping; however, the floor <br />does not appear to have been constructed to drain inward. Significant spills from piping near the <br />perimeter of the concrete have the potential to flow out of the drain building to the adjacent swales. <br />The drains located in the swales are protected by oil absorbing booms and solid covers in high <br />traffic areas. The Swale drains are connected to the Site's storm water pond by subsurface piping. <br />Gasoline from salvaged vehicles is initially gravity drained from the vehicle to the sump tank to <br />where it is evaluated and segregated into waste gasoline or recyclable gasoline based on color. <br />Waste gasoline is gravity drained from the sump tank and transferred to 55 -gallon drums stored on <br />containment pallets. The concrete floor within the drain building provides secondary containment for <br />piping indoors and the concrete floor and berm provide secondary containment for the piping <br />outdoors. Waste diesel, if identified, is also stored in drums, similar to the waste gasoline. <br />Details of tank piping are provided in Table 2. Example pictures of the drain racks and associated <br />piping are provided in Appendix A. <br />Hazardous Waste Tank Assessment Stockton, CA <br />Schnitzer Steel — Pick -n -Pull 4 Project No. 04.20160002 <br />