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AGS <br /> ceased operation approximately two years ago and has remained inactive through the <br /> present (Gail Qatsha, personal communication). The OWS was cleaned-out and fluids <br /> were removed from the waste-oil tank as part of the Navy's decommissioning of the <br /> OWS system at Building 12 (Gail Qatsha, personal communication). <br /> Construction plans for the Building 12 OWS system are included in Appendix A. The <br /> following construction summary is obtained from that source. A drainage catch basin is <br /> located in Building 12, with a connecting drain pipe leading to the wash-pad catch basin. <br /> Anecdotal evidence suggests that only soapy water from boat washing was flushed <br /> down this drain. For that reason, the Building 12 catch basin and connecting drain pipe <br /> are not considered to be significant sources of contamination. This area is therefore not <br /> being considered for further investigation. The wash pad area consists of a concrete <br /> slab with a centrally located catch basin. The invert of the catch basin is approximately <br /> 1.5 ft below the ground surface (bgs). The catch basin is connected to the OWS by <br /> approximately 27 lineal feet of drain pipe occurring at a depth of approximately 1.5 to <br /> 2.5 ft bgs, deepest near the OWS. The OWS is located in an unpaved area south of the <br /> wash pad. The invert of the OWS structure is approximately 2.5 ft bgs. Two 2.5-ft-deep <br /> pipes lead away from the OW& an OWS discharge pipe connects to the sanitary sewer <br /> junction at a distance of 28 lineal feet from the OWS and a waste oil pipe connects to <br /> the waste oil tank. The tank vault is located directly adjacent to the OWS. The vault is <br /> constructed of reinforced concrete and is approximately 6 ft wide by 9 ft long and by 7.2 <br /> ft deep. The walls and floor of the vault are approximately 0.5 ft thick. A 285 gallon <br /> steel tank rests on a concrete saddle within the vault. The connecting subsurface waste <br /> oil pipe enters the vault from the side and connects to the top of the tank. Additional <br /> tank and vault details and other site information are included in the construction plans <br /> (Appendix A). <br /> Building 410A OWS. Building 410A is located approximately midway along the north <br /> side of NCTS Stockton (Figure 2). The Building 410A OWS site is located at a steam <br /> 7 <br /> 1lLAURA�CW-mn6i`,+VPDCCSA95-CLTS14.995t950304o\N/cnc PlantWc K?an=c <br />