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September 17, 1993 <br /> Skobrak Property, Stockton, California <br /> ground surface (bgs) Groundwater was encountered at a depth of approximately 32 feet bgs <br /> Laboratory analyses of cored soil samples collected at depths of approximately 20 5, 25 5, and <br /> 30 5 feet below grade indicated the presence of elevated concentrations of petroleum <br /> hydrocarbons Details of the Phase I assessment are summarized in WaterWork's "Prehminary <br /> Assessment Report', dated January 12, 1990 <br /> On May 25, 1990, under the direction of Canonie Environmental personnel, Thorpe Oil Co <br />' removed two additional 1,000-gallon USTs from the southern portion of the subject site (Canonie <br /> Environmental, June 1990) These tanks included a diesel tank (Tank B) and a leaded gasoline <br />' tank (Tank C) The analytical results of soil samples collected from beneath the tanks are <br /> summarized in Table 1 <br />' Due to the presence of elevated levels of petroleum hydrocarbons in soils beneath Tanks A, B, <br /> and C, the PHS/EHD has requested additional work be performed at the site <br /> 3.0 SITE SETTING <br /> The project site is located within the Eastern San Joaquin County Groundwater Basin The basin <br />' is drained by the San Joaquin River and its tributaries Groundwater recharge occurs principally <br /> along the San Joaquin River and Sacramento River Delta north of Stockton with contributions <br />' from numerous smaller rivers and creeks The nearest surface water body to the site is McLeod <br /> Lake located approximately 314 miles west of the site The site is situated on level terrain <br />' comprised of Quaternary-Recent alluvial sediments The geology of the Stockton area consists <br /> of a thick sequence of river channel and flood plain deposits These sequences contain <br />' interbedded sand, gravel, silt and clay layers As is typical of alluvial environments, higher <br /> permeability zones representing former stream channels may occur as sinuous or lenticular <br />' features Based upon previous sampling, the water table is expected to occur at approximately <br /> 30 feet below grade and, according to San Joaquin Flood Control and Conservation District data, <br /> flow east to southeast (Fall 1992) <br />' WP-0993 DRr 2 <br />