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I ' r o • Quarterly Report - October and November 1997 ' CALIFORNIA FUELS CARDLOCK STATION 2402 Pacific Avenue Stockton, California 10. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr David Atwater of Van De Pol Enterprises, Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 2402 Pacific Avenue, ' Stockton, California The location of the site is illustrated in Figure 1 -Location Map A plan of the site is illustrated in Figure 2 - Site Plan The scope of work for this investigation included Installation of two dual completed in-situ air ' sparging wells and monitoring of petroleum hydrocarbon-impacted ground water on the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley Regional Water Quality Control Board for investigation of underground storage tank (UST) sites Background information and a description of prior investigations at the site was included in Preliminary Site Investigation and Evaluation Report - August 1996, dated 09 September 1996 10 prepared by AGE 1 2.0. PROCEDURES 21 REVIEW OF REGIONAL DEPTH TO GROUND WATER MAPS Review of depth to ground water maps published by the San Joaquin County Flood Control and Water Conservation District and dating back to 1971 suggested that historical ground water depths may have been as low as 70 feet bsg near the site 22 QUARTERLY MONITORING AND SAMPLING ACTIVITIES OCTOBER 1997 On 16 October 1997, quarterly ground water monitoring and sampling procedures were performed on wells MW-1 through MW-9,VW-1 and VW-2 Ground water levels and total well depths at MW- 1 through MW-9,VW-1 and VW-2 were measured to the nearest 0 01-foot utilizing a Solinst water level meter The relative ground water elevations were calculated by subtracting the depth to ground water from the relative casing elevations surveyed from a temporary benchmark assigned an arbitrary elevation (Table 1 - Relative Ground Water Elevations) Relative ground water elevations were plotted and contoured on a scaled site rnap (Figure 3 - Relative Ground Wates Elevation Map) After water levels were measured approximately four to eight gallons of ground water minimum of three well volumes) were purged from MW-1 through MW-9, VW-1 and VW-2 utilizing a two- Advanced GeoEnvironmental,Inc