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AGS Building 508 OWS. Building 508 is located approximately midway along the north side of NCTS Stockton, adjacent to the shoreline of the Stockton Deep Water Channel (Figure 2). The OWS site is located on the west side of Building 508. The layout of the Building 508 OWS site is shown on Figure 5. The principal elements of the OWS system include the wash pad drain grate (i.e., silt basin), the OWS, the waste oil tank, and connected piping. The OWS system was constructed in approximately 1986, based on the drawing date included on the construction plans (Appendix A). The OWS system is currently active; the Navy leases the facility to an oil recovery and ship salvage contractor (Gail Qatsha, personal communication). As observed during the AGS site visit, the contractor uses the wash pad to steam-clean general equipment used in the Building 508 warehouse and adjacent yard (e.g., fork lifts, pallets, etc.) as well as equipment used in oil recovery and salvage activities performed by the contractor. The OWS system is regularly serviced, including the periodic inspection and cleaning of the OWS and removal of fluids from the waste-oil tank (Gail Qatsha, personal communication). Construction plans for the Building 508 OWS system are included in Appendix A. The wash pad area consists of a concrete slab with a centrally located drainage grate/silt basin (Figure 5). The invert of the drainage basin is approximately 1 .0 ft bgs. The drainage basin is connected to the OWS by a 1 ft length of 0.5-ft-deep drain pipe. The OWS is located on the concrete pad directly adjacent to the drainage basin. The invert of the OWS structure is assumed to be approximately 3.0 ft bgs, based on the given depth of the connected waste oil pipe. A discharge pipe (approximately 3.0 ft bgs) leads away from the OWS to connect to the sanitary sewer, approximately 10 lineal feet from the OWS. The 3.0-ft-deep waste oil pipe extends approximately 13 lineal feet to the nearest wall of the tank vault. The tank vault is located in an asphalt-paved area on the west side of the concrete pad. The tank vault is constructed of reinforced concrete and is approximately 8.75 ft wide by 11.75 ft long by 9.3 ft deep. The walls and floor of the vault are approximately 0.8 ft thick. A 550 gallon steel tank rests on a concrete 9 \\LAURA1C1Wown6CC4VPDCC5\95-CL'S'995195o3C4CkWCAc PlankWOM P!an.acc