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QUARTERLY REPORT <br /> Pacific Gas <br /> 2088 Mariposa Road <br /> Stockton, California <br /> Decem ber 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 monitonng activities at 2088 Mariposa <br /> ' Road in Stockton, California (the site) Each monitoring well at the site was purged and <br /> sampled during the fourth quarter of 1994 The location of the Site is illustrated in Figure <br /> 1 A plan of the Site is illustrated on Figure 2 <br /> 2.0 BACKGROUND <br /> 2.1 Site Location <br /> The site is located in a mixed use area of southeast Stockton and was occupied by Pacific <br /> Gas as a service station until 1990 (Figure 1) 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 139, <br /> near the former pipelines GeoAudit recommended further excavation of tank pit #1 to <br /> O.o;.,_I M&S.�I.- 1 <br /> P...rk a.ORM7 KtR s <br /> 1 _ <br />