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' Quarterly Report - Fourth Quarter 2004 i LARRY'S AUTO ' 308 North Grant Street, Stockton, California ' 1.0. INTRODUCTION 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(site) The scope of work included a quarterly ground water monitoring event and preparation of this report The location of the site and the surrounding area are illustrated in Figure 1 Structures and monitoring ' well locations at the site are illustrated in Figure 2 Site background information is provided in Appendix A j 2.0. PROCEDURES Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) t sites Procedures for the sampling of the monitoring and extraction wells were described in the AGE- prepared Work Plan Addendum, dated 15 December 1995, and Quarterly Report-August 1997 • 21 WELL MONITORING AND PURGING On 15 December 2004, a Solinst water level meter was used to measure the depth to ground water in five ground water monitoring wells and five vapor extraction wells relative to the tops of the well casings The ground water elevations and gradient were determined from this data(Table 1) After recording water level measurements,a Waterra Hydrolift Pump was used to purge monitoring wells MW-1 through MW-4, MW-7, VW-3, and VW-4 of standing water, dedicated disposable plastic bailers were used to purge the remaining wells of standing water The wells were generally evacuated in order of least contaminated to most contaminated,based on previous monitoring data ' Between 13 and 18 gallons of water(a minimum of three casing-water volumes)were purged from monitoring wells MW-1 through MW-4, and between 7 5 and 10 5 gallons of water were purged ' from monitoring well MW-7 and vapor extraction wells VW-2B, VW-3, VW-4, and VW-5C Approximately 175 gallons of water was removed from vapor extraction well VW-513 Ground water temperature,pH,and conductivity were measured at regular intervals during the purge process using an Oakton water analyzer Purged water was stored on-site in properly labeled, Department of,Transportation (DOT)-approved 55-gallon drums The field data sheets are included in Appendix B .Advanced GeoEnvironmental,Inc i