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FI <br /> til, <br /> I <br /> • Quarterly Report - Third Quarter 2001 DFS' I j 1L,Ui <br />' <br /> LARRY'S AUTO <br /> 308 North Grant Street Stockton California �� `' <br /> I1 0. INTRODUCTION <br />' At the request of Mr Charles Skobrak,Advanced GeoEnvironmental,Inc (AGE)has prepared this <br /> quarterly report for the property located at 308 North Grant Street, Stockton, California The scope <br /> of work included quarterly ground water monitoring and preparation of this report The location of <br />' the site and the immediately surrounding area is illustrated on Figure 1, structures and monitoring <br /> well locations on the site are illustrated on Figure 2 Background information is summarized in <br /> Quarterly Report -August 1997, prepared by AGE <br /> I <br />' 2.0 PROCEDURES <br /> Field work was performed in accordance with guidelines issued by the California Regional Water <br /> Quality Control Board-Central Valley Region for investigation of underground storage tank(UST) <br /> sites Ground water monitoring,procedures were performed as outlined in the RESNA-prepared <br /> Assessment of Soil and Groundwater Contamination,dated 17 September 1993 and approved by the <br /> • PHS-EHD by letter dated 28 September 1993 <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 04 September 2001, a Solinst water level meter was used to measure the depth to ground water <br /> in five ground water monitoring wells and five vapor extraction wells relative to the tops of the well <br /> casings The ground water elevations and gradient were determined from this data(Table 1) <br /> After recording water level measurements,two-stage submersible pumps were used to evacuate the <br /> wells of standing water The wells were evacuated in order of from least contaminated to most <br /> contaminated, based on previous monitoring data The purge pumps were decontaminated prior to <br /> evacuating each well using an Alconox solution and a clean-water rinse <br /> Between 17 and 21 gallons of water were evacuated from monitoring wells MW-1 through MW-4, <br /> and between 11 and 13 gallons of water were evacuated from monitoring well MW-7 and vapor <br /> extraction wells VW-2C,VW-3,VW-4 and VW-5C,approximately 6 gallons ofwater were removed <br /> from vapor extraction well VW-513 Groundwater temperature,pH and conductivity were measured <br /> at regular intervals during the purge process using a Hydac water analyzer Purged water was stored <br /> on site in labeled, 55-gallon DOT-approved drums The field data sheets are included in <br />' Appendix A <br /> • <br /> I <br /> Advanced GeoE nviron mental,Inc <br />