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1 0 INTRODUCTION <br /> On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental <br /> has prepared this Groundwater Monitoring Report, First Quarter 2003 for submittal to San Joaquin <br /> County Environmental Health Division (EHD) and to the Central Valley Regional Water Quality <br /> Control Board (RWQCB) <br /> The scope of work was completed according to Ramage Environmental's Work Plan, Monitonng <br /> Well Installations, dated July 16, 2001 On August 2, 2001, EHD approved the work plan <br /> 1 1 Site Location and Description <br /> The subject site is an active single-level parking garage located at 130 N Hunter Street in <br /> Stockton, California (Figure 1) Two former gasoline underground storage tanks (UST) existed <br /> under the sidewalk, adjacent to the west side of the garage building, and two former gasoline <br /> dispensers on a single island existed approximately 20 feet inside the building (Figure 2) <br /> 12 Previous Work <br /> I <br /> 1 2 1 Initial Soil Borings <br /> In May 1994, Kleinfelder drilled two soil borings (designated B-1 and B-2) at the south ends of <br /> each UST (Figure 2) Kleinfelder docurnented the results of the investigation in Environmental <br /> 1 and Geotechnical Assessment Report and Tank Removal Plan, dated August 26, 1994 <br /> ' Both soil borings were drilled to a total depth of approximately 25 feet below ground surface (bgs) <br /> Based on field screening with a photoionization detector(PID), only the soil sample with the <br /> highest organic vapor concentration from each boring was submitted for laboratory analysis The <br /> soil sample collected at 20 feet from B-1 contained 290 milligrams per kilogram (mg/kg) of Total <br /> Petroleum Hydrocarbons (TPH)-as-gasoline, 4 7 mglkg of ethylbenzene, and 8 0 mg/kg of <br /> xylenes The sod sample collected at 18 feet from B-2 contained 250 mg/kg of TPH-as-gasoline, <br /> 1 7 mg/kg of ethylbenzene, and 7 0 mg/kg of xylenes The sod samples from the bottom of the <br /> boreholes were not submitted for laboratory analysis Groundwater was not encountered during <br /> the investigation The sod sample analytical results are summarized in Table 1 <br /> r <br /> . 3 <br />