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QUARTERLY GROUNDWATER MONITORING REPORT Pacific Gas 2088 Mariposa Road Stockton, CA ' May 1994 ' 1.0 INTRODUCTION In accordance with a request from Mr Manuel Sanchez of Pacific Gas, Geological Audit ' Services, Inc (GeoAudit) has performed quarterly monitoring activities at 2088 Manposa Road in Stockton, California (the site) The purpose of these activities was to monitor groundwater conditions at the site This report describes the activities performed during the second quarter of 1994 and presents the results The location of the Site is illustrated in Figure 1 A plan of the Site is illustrated on Figure 2 ' 2.0 BACKGROUND 2.1 Site Location Located in a rural low-dense commercial area in southeastern Stockton (Figure 1 the site low-density � g )� ' was occupied by Pacific Gas as a service station until 1990 A single structure is Iocated on the northeast corner of the site (Figure 2) 1 2.2 Tank Removal Five underground storage tanks and associated piping were removed by Falcon Energy Associates in May, 1990, and hydrocarbons were detected in all 17 soil samples collected beneath the tanks and piping The San Joaquin County Public Health Services - Environmental Health Division(PHSIEHD) required a soil investigation to assess the extent of contamination at the site 2.3 Drilling In March of 1993, GeoAudit drilled nine soil bonngs to assess the lateral and vertical extent of soil contamination The results were presented in GeoAudit's Preliminary Investigation and Evaluation Report (April 1993) Borings drilled around the margins of the fuel tank pit (tank pit #1) and in the waste oil tank pit (tank pit #2) did not encounter any soil contamination Minor contamination was detected in borings B7 and B9, near the former ' pipelines GeoAudit recommended further excavation of tank pit #1 to remove contamination that might be present below a depth of 15 feet 0-6 1 Kafir.G.QW.-944"