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i I r +♦ (quarterly' Report - Third Quarter 2002 LARRY'S AUTO 308 North (rant Street, Stockton, California 1.0. INTRODUCTION i At the request of Mr Charles Skobrak,Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 308 North Grant Street, Stockton, California The scope of work included quarterly ground water monitoring and preparation of this report The location of the site and the immediately surrounding area is illustrated on Figure 1, structures and monitoring well locations on the site are illustrated on Figure 2 Background information is summarized in the AGE-prepared Quarterly Report -August 1997 1 2.0 PROCEDURES ' Field work was performed in accordance with guidelines issued by the California Regional Water Quality Control Board - Central Valley Region (CVRWQCB) for investigation of underground ' storage tank (UST) sites Ground water monitoring procedures were performed as outlined in the RESNA-prepared Assessment of Soil and Groundwater Contamination, dated 17 September, 1993 • and approved by the San Joaquin County Environmental Health Department (EHD) by letter dated ' 28 September 1993 ' 21 WELL MONITORING AND EVACUATION On 13 September 2002, a Solinst water level meter was used to measure the depth to Piound water in five ground water monitoring wells and five vapor extraction wells relative to the nip: of Lhc NN el? casings The ground water elevations and giadient were determined from this data (Table 1 ) iAfter recording water level measurements, a two-stage submersible pump or dedicated disposable bailers were used to evacuate the wells of standing watei The wells were evacuated in order of least contaminated to most contaminated, based on previous monitoring data The purge pump was decontaminated pnor to evacuating each well using an Alconox solution and double-rinsed with clean water Between 17 and 20 gallons of water (a minimum of three casing volumes) were; evacuated r'tom monitoring wells MW-1 through MW-4, and between 9 and 12 gallons of waier were evacuat(_OA from monitoring well MW-7 and vapor extiaction wells VW-2B, VW-3, VW-4 and VW-�C, approximately 3 5 gallons of water was removed from vapor extraction well \,W-5 f3 Ground ,vatci temperature,pH and conducts ii,y were me&,ured atregular intervals during the purge process using ' an Oakton water analyver Pu ged water v,as stored on stte'in properly labeled 55-gallon I)0 F- . approved drums The field data Sheets are included in Appencaix A 1 E Advanced GeoEnvironmeot'd,[xic