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Project No. 8753009Q-AN02 !• Woodward-Clyde Consultants ranging from 6 to 14 feet; two borings were reported dry at the time of drilling. Groundwater, where reported present, appeared to be associated with strata of lean blue-grey clays. Site History The site has been used as a petroleum handling facility for more than 40 years. Lead agency status for underground tank regulation enforcement at the petroleum storage and handling terminal is accorded to the San Joaquin County Local Health District (SJLHD) - Environmental Division. Based on discussions with Ms. Laurie Cottula (SJLHD) on June 30, 1987, the Central Valley Regional Water Quality Control Board has assumed lead agency status for matters involving the petroleum storage and handling terminal. Hazardous materials incidents are regulated under the coopera- tive administration of the California State Department of Health Services (Sacramento) and the Regional Water Quality Control Board (RWQCB) , Central Valley region. Each agency was contacted and documents open to public review were inspected. Although some leakage or spills undoubted- ly occurred prior to 1983, records .were generally not available for that period of time (i.e. , before the start of regulatory involvement with un- derground storage tank and hazardous materials incident regulation). A review of records indicates a number of incidents were reported to the agencies since 1983. Other potential sources of hydrocarbons in the j terminal area include underground pipelines, unlined impoundments and trenches. HYDROLOGIC FIELD INVESTIGATION The Phase I hydrologic field investigation was designed to assess the water table elevation along the perimeter of the terminal area and the potential direction of groundwater/contaminant migration in the tank terminal area. An assessment of the presence of free product on the groundwater surface was also made. I . -4-