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i i San Joaquin County Health Department November 13, 1989 Page 3 ; expected to be encountered at a depth of approximately 15 feet beneath the surface at the Ford Dealership. Because of the relatively high viscosity of the waste oil, it is believed that the vertical extent of the contamination is limited and restricted to vadose zone soils. However due to the relatively high permeability of the sandy soils it is recommended that site remediation proceed as soon as possible. SOIL REMEDIATION PROPOSAL Due to the small and localized nature of the contamination, no further assessment work is needed.to characterize the problem area. It is proposed that site remediation consist of the excavation of all waste-oil contaminated soil. ,It is expected that no mare than 15 to 25 cubic yards of soil will need to,be removed for off-site disposal. This material will be properly manifested and transported to the GSX facility near Buttonwillow in Kern County for proper disposal.- Additional soil samples will be collected from the base of the excavation to confirm that all contaminated soil has been removed. These soil samples will be collected using driven-tube type sampler, capped and sealedin the field° and extruded in the lab in order to reduce the lose of volatile materials. The samples will be analyzed for both BTXE and TPH. Although it is believed that the contaminated is restricted to vadose zone soils and has not impacted groundwater,. site remediation . activities will immediately be suspended if groundwater is encountered during the excavation of the waste oil contaminated soil. In the unlikely event that the contamination has reached the water table a new SRP will be' prepared and will include the installation of groundwater monitoring wells and sufficient groundwater sampling and analysis; to fully characterize the extent of contamination. Sincer i Kent S. Murray, Ph.D. President cc: Lambert Barnum, San Andreas f