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1 <br /> • QUARTERLY REPORT <br /> ' March 1995 and June 1995 <br /> Pacific Gas <br /> 2088 Mariposa Road <br /> ' Stockton, California <br /> 1 <br /> 1.0. INTRODUCTION <br /> In accordance with a request from Mr Manuel Sanchez of Pacific Gas,Advanced GeoEnvironmental, <br /> Inc (AGE)has prepared this Quarterly Report summarizing field activities performed during the first <br /> ' and second quarters of 1995 at 2088 Manposa Road in Stockton, California (Figure 1) Field <br /> procedures for March 1995 were performed by Geological Audit Servies, Inc (GeoAudit) Field <br /> procedures for June 1995 were performed by AGE <br /> tFor each moivtoring event,wells at the site were purged and sampled in accordance with Tn-Valley <br /> Regional Board guidelines The location of the Site is illustrated in Figure 1 A plan of the Site is <br /> illustrated on Figure 2 <br /> 2.0. BACKGROUND <br /> 21 SITE DESCRIPTION <br /> ' Located in a mixed use area of southeast Stockton(Figure 1), the site was occupied by Pacific Gas <br /> and used as a service station until 1990 A single structure is located on the northeast corner of the <br /> ' site (Figure 2) The site is presently operated by an automobile smog shop <br /> Five underground storage tanks and associated piping were removed by Falcon Energy Associates <br /> ' in May 1990, hydrocarbons were detected in all 17 soil samples collected beneath the tanks and <br /> piping The excavation was not backfilled after removal of the tanks The San Joaquin County Public <br /> Health Services-Environmental Health Division (PHS•EHD) required a soil investigation to assess <br /> ' the extent of contamination at the site <br /> ' 2 2 DRILLING <br /> ' In March 1993, nine soil borings were installed by GeoAudit to assess the lateral and vertical extent <br /> of soil contamination The results were presented in GeoAudit's Preliminary Investigation and <br /> Evaluation Report(April 1993) Bonngs drilled around the margins of the fuel tank pit (tank pit#1) <br /> ' and in the waste oil tank pit (tank pit #2) did not encounter any soil contamination Low <br /> concentrations of hydrocarbons were detected in borings B7 and B9, near the former pipelines <br /> N GeoAudit recommended further excavation of tank pit #1 to remove contamination that might be <br /> present below a depth of 15 feet <br />