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hydraulic oil concentrations above 50 mg/kg (ppm). Therefore, the maximum depth of the contamination is assumed to be less than 4 feet bgs. The surface and subsurface materials include railroad tracks, ties, ballast (gravel base beneath the railroad tracks), spikes, and underlying soil. The two impacted areas will be investigated by first taking two hand auger samples north of Impacted Area #1 and four groundwater samples (two beneath each impacted area). Following receipt of these results, Tetra Tech will commence removal activities of the railroad tracks, ties, ballast, and spikes above the impacted areas. The ballast and the soil will be removed in the two designated excavation areas. Following completion of the excavations, field TPH immunoassay test kits will be utilized to determine if the excavations have met the clean-up levels. Verification samples will be collected and sent to a fixed laboratory to document that the hydraulic oil impacted soils have been removed. The contaminated materials will be transported to an approved Class III landfill unless the analytical results indicate that the materials are a hazardous waste. Preliminarily, the sizes of the two excavations will be 10' x 50' x 4' deep and 10' x 10' x 4' deep at Impacted Area #I and 10' x 111' x 4' deep at Impacted Area #2. These areas are shown on Figures 3 and 4. 3.1 Pre-Removal Activities Once this Work Plan, including the Sampling Analysis Plan (SAP) and Health and Safety Plan (HSP) has been approved, the applicable permits will be obtained. Since the excavations are limited to 4 feet in depth, an excavation permit is not required from the Central Valley Air Quality Management District (CV-AQMD). Mr. Jim Peck of the DLA will coordinate with the Navy to obtain all necessary Base permits prior to commencement of field activities. Rough&Ready Island 13 Tetra Tech,Inc. Revised Draft Work Plan November 18, 1998