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QUARTERLY REPORT <br /> Pacific Gas <br /> 2088 Mariposa Road <br /> Stockton, California <br /> September 1994 <br /> 1.0 INTRODUCTION <br /> ' In accordance with a request from Mr. Manuel Sanchez of Pacific Gas, Geological Audit <br /> Services, Inc (GeoAudit) has performed quarterly monitoring activities at 2088 Manposa <br /> ' Road in Stockton, California (the site). Each monitoring well at the site was purged and <br /> sampled during the third quarter of 1994 The location of the Site is illustrated in Figure 1 <br /> A plan of the Site is illustrated on Figure 2 <br /> 2.0 BACKGROUND <br /> ' 2.1 Site Location <br /> Located in a mixed use area of southeast Stockton (Figure 1), the site was occupied by <br /> Pacific Gas as a service station until 1990 A single structure is located on the northeast <br /> corner of the site (Figure 2) <br /> 2.2 Tank Removal <br /> ' Five underground storage tanks and associated piping were removed by Falcon Energy <br /> Associates in May 1990; hydrocarbons were detected in all 17 soil samples collected beneath <br /> the tanks and piping The excavation was not backfilled after removal of the tanks The <br /> ' San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) <br /> required a soil investigation to assess the extent of contamination at the site <br /> ' 2.3 Drilling <br /> ' In March 1993, GeoAudit drilled nine soil borings to assess the lateral and vertical extent <br /> of soil contamination The results were presented in GeoAudit's Preliminary Investigation <br /> and Evaluation Report (April 1993) Borings drilled around the margins of the fuel tank pit <br /> (tank pit #1) and in the waste oil tank pit (tank pit #2) did not encounter any soil <br /> contamination Low concentrations of hydrocarbons were detected in borings 137 and B9, <br /> near the former pipelines GeoAudit recommended further excavation of tank pit #1 to <br /> 1 <br />