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I)EAkTHCON' <br /> 2.2 Tanks <br /> The hazardous waste tank system at the Site includes the following: <br /> • Four—330 gallon, horizontal cylindrical cross-linked polyethylene(XLPE)single walled tanks <br /> used for used oil (01 through 04) <br /> • Four—220 gallon, horizontal cylindrical XLPE single walled tanks used for waste antifreeze <br /> (Al through A4) <br /> • One—385 gallon, vertical cylindrical high density polyethylene (HDPE)double walled tank <br /> used for used oil (Customer Drop-off) <br /> Details regarding the hazardous waste tank system are provided in Table 1 and Figure 3. Site <br /> photographs, including images of the tanks, are provided in Appendix A. <br /> 2.2.1 Secondary Containment <br /> The hazardous waste tank systems for the used oil and waste antifreeze are located within XLPE <br /> secondary containment within the Drain Building (see Figures 2 and 3).Additionally,the secondary <br /> contained tanks are located within the concrete paved, roofed Drain Building,which is comprised of <br /> 2 walls and is open to the west and east sides. The Drain Building floor is constructed of concrete <br /> and the west and east entrances are each bordered with a drainage Swale. The concrete floor is <br /> relatively flat and provides secondary containment for the piping that extends from the drain racks to <br /> the secondary containment for the tanks. Minor drips and spills that occur during removal of the <br /> fluids from the vehicles are controlled with absorbent that is drummed and disposed after use. <br /> Dimensions and the associated calculations of the secondary containment capacities are provided <br /> in Appendix B. The capacities were calculated by determining the interior volume of each <br /> secondary containment unit and ensuring that this volume was greater than the volume of the <br /> largest tank plus the maximum volume of the associated piping. When applicable,the volume of the <br /> other tanks within the associated containment was subtracted from the containment capacity to <br /> account for the displaced volume they represent. Each containment tank was found to have excess <br /> capacity(see Appendix B). The interior of the containments was relatively clear of trash and debris. <br /> The bottom of the containments did not show evidence of damage or leaks. <br /> Secondary containment calculations are provided in Appendix B and manufacturer specifications <br /> are provided in Appendix C. <br /> Hazardous Waste Tank Assessment Stockton,CA <br /> Schnitzer Steel—Pick-n-Pull 3 Project No.04.20160002 <br />