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' • • Additionally, the secondary containment tanks are located within the paved, roofed Drain Building, which is comprised of 2 walls and is open to the west and east sides. The Drain Building floor is constructed of concrete and the west and east entrances are each bordered with a drainage Swale. The concrete floor is relatively flat and provides secondary containment for the piping that extends from the drain racks to the secondary containment for the tanks. Minor drips and spills that occur during removal of the fluids from the vehicles are controlled with absorbent that is drummed and disposed after use. The dimensions of the two above ground secondary containment tanks are approximately 13 ft long by 8 ft wide by 2.3 feet high. The containment tanks are molded with sidewall indentations to provide structural strength (See Drawing 15101000 in Appendix C). The northern secondary containment holds tanks 01, 02, Al, and A2; the southern secondary containment holds tanks 03, 04, A3, and A4. Calculations of the secondary containment capacity are provided in Appendix B. The capacity was calculated by determining the interior volume of each secondary containment tank and ensuring that this volume was greater than the volume of the largest tank in the compartment plus the maximum volume of the associated piping. In addition, the volume of the other tanks within the associated containment was subtracted from the containment capacity to account forthe displaced volume it represents. Each containment tank was found to have excess capacity (see Appendix B). The interior of the containments was relatively clear of trash and debris. The bottom of the containments did not show evidence of damage or leaks. 2.3 Piping Waste antifreeze and waste oil from salvaged vehicles is gravity drained into their associated tanks located in the aboveground secondary containments, as previously described. Details of waste tank piping are provided in Table 2. 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) header piping that extends from the drain racks to the storage tanks within the secondary containments. Example pictures of the drain racks and Hazardous Waste Tank Assessment Stockton, CA Auto Parts Group — Pick -N -Pull 3 Project No. 211283