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Quarterly Report - First Quarter 2003 LARRY'S AUTO 308 North Grant Street, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Charles Skobrak,Advanced GeoEnvlronmental, Inc (AGE)has prepared this quarterly report for the property located at 308 North Grant Street, Stockton, California(site) 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 Site background information is provided in Appendix A 2.0. PROCEDURES IField 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 I2 1 WELL MONITORING AND PURGING I On 19 March 2003, a Solmst 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 Watera Hydroliff Pump was used to purge monitoring wells MW-1 through MW-4 of standing water and dedicated disposable plastic bailers were used to ' purge the remaining wells of standing water The wells were evacuated in order of least contaminated to most contaminated, based on previous monitoring data ' Between 17 and 19 5 gallons of water (a minimum of three casing volumes) were evacuated from monitoring wells MW-1 through MW-4, and between 9 and 12 gallons ofwater were evacuated from monitoring well MW-7 and vapor extraction wells VW-2B, VW-3, VW-4 and VW-5C ' Approximately 3 3 gallons ofwater were removed from vapor extraction well VW-5B 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, 55-gallon DOT- approved drums The field data sheets are included in Appendix B • ' Advanced GcoEnvironmental,Inc