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�.. ..i WORK PLAN Determination of the Extent of Contamination from Used Sand From Sandblasting Boat Bottoms 1.0 Introduction Tom Newhall Boat Repair(TNBR) is situated at Paradise Point Marina, 8090 Rio Blanco Road, Stockton, CA. Boat repair services have been provided at this location for ` approximately twenty-five years, the last three of which under management by Mr. Tom Newhall. Services currently provided include hull repair (wood and fiberglass), painting, sandblasting and re-coating bottoms. The San Joaquin County Environmental Health Department inspected the site on October r 7, 2003, and secured a sample of used sand from the sandblasting operation. This sample was analyzed for metals per EPA #6010B. The sample was found to be hazardous for copper, and TNBR was directed to immediately cease disposing of used sandblast sand to the ground, and to cleanup stockpiled used sand under direction from the Department of �- Toxic Substance Control. This Work Plan outlines plans and procedures proposed to accomplish the required cleanup and to prevent environmental damage from these operations at the TNBR facility. ` 2.0 Site Description The subject site is north of Stockton, west of Interstate 5, at Bishop Tract, as shown in Figure 1. Paradise Point Marina and TNBR are on Disappointment Slough on the California Delta. TNBR site is divided by Rio Blanco Road. The portion south of Rio Blanco Road is paved and generally slopes down to the water. The portion north of Rio Blanco Road includes a building, a parking area, concrete slab and graveled area, as shown in Figure 2. The sandblasting area has been relocated to the north side, on the concrete slab. L 2.1 Hydrogeological Conditions Groundwater is present at just a few feet below ground surface (bgs), which slopes to surface water level around the south part of the site. Thus, it is extremely important to - 1 -