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Report", 1993 Versar Inc , boring logs can be found in "Site Assessment of the Pacific Bell <br /> Ashley Road, Stockton Facility (UE132) - 1989 and Interim Remediation Pilot Study Report - <br /> 1992" by Versar Incorporated <br /> 5.3 Site Hydrogeology <br /> Groundwater is known to exist beneath the site at an approximate depth of 135 feet (as <br /> witnessed in an onsite water well) Investigative efforts to date have not encountered <br /> groundwater, as maximum borehole depths have been 45 feet below grade Based on <br /> topography, the suspected groundwater flow direction is southwesterly towards the nearby <br /> Calaveras river <br /> 6.0 Beneficial Uses of Water <br /> The Water Quality Control Plan (Basin Plan) for the San Joaquin River Basin lists the <br /> beneficial uses of groundwater within San Joaquin County as municipal and domestic water <br /> supply, irrigation, stock watering and service supply (RWQCB, 1990) Groundwater is known <br /> to be used for agricultural purposes throughout the rural area surrounding the site The <br /> nearest groundwater well is located 50 feet southwest of the former tank location and is used <br /> by Pacific Bell in their facility operations The well is reportedly 150 feet deep and draws <br /> water from an aquifer at approximately 135 feet below grade <br />■ 7.0 Extent of Petroleum Hydrocarbons in Soils <br />' 7.1 Summary of Soil Sample Analytical Data <br /> Analysis of the initial two verification soil samples collected from the base of the tank <br /> excavation in April 1988 revealed detectable diesel fuel concentrations <br /> Analysis of soil samples collected in November 1988 from soil borings BH-1, BH-3, BH-4, <br /> and BH-5, revealed the presence of diesel fuel and volatile petroleum hydrocarbons Soil <br /> boring BH-1 was drilled directly through the former tank location with borings BH-3, BH-4, <br /> and BH-5 situated within approximately 10 feet of the farmer tank location to the east, north, <br /> and west respectively Impacted soils appeared to be concentrated within a ten foot radius of <br /> the former tank location, with the greatest petroleum concentrations encountered directed <br /> beneath the former tank (borehole BH-1 at 30 feet below grade) The soil sample collected at <br /> MZ101-27-95/UST/95-0011 nbr 7 <br />