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i 1 ' Quarterly Report - Fourth Quarter 2004 CHET'S AUTOMOTIVE 545 East Miner Avenue, Stockton, California ' 1.0. INTRODUCTION At the request of Ms Kimberly Farris-Yarwood of the Estate of Chester Farris (property owner), ' Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 545 East Miner Avenue, Stockton, California(the site) The scope of work Included the monitoring and sampling of five ground water monitoring wells,submittal of monitoring and analytical data to the State Water ' Resources Control Board's GeoTracker information management system, and preparation of this report The site and its surroundings are illustrated on Figure 1 Structures,probe boring,soil sample, and monitoring well locations are shown on Figure 2 This report was prepared in accordance with Central Valley Regional Water Quality Control Board ' (CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites Site history and findings from previous site investigations are summarized in Appendix A,the results of previous monitoring events are included in the tables of this report 2.0. PROCEDURES • This investigation was conducted in accordance with guidelines established by the CVRWQCB and the San Joaquin County Environmental Health Department(EHD)for the subsurface investigation ' of UST sites and sampling of ground water monitoring wells,respectively ' 2 1 WELL MONITORING AND EVACUATION On 30 November 2004,a Solmst water level meter was used to measure the depth to ground water ' in monitoring wells MW-1 through MW-5 relative to the tops of the well casings After ground water depth measurements were collected, monitoring wells MW-1 through MW-5 were purged of standing water using dedicated, disposable plastic bailers Approximately 125 and 19 gallons of twater were purged from wells MW-2 and MW-5, respectively Wells MW-1, MW-3, and MW-4 were purged dry after 0 5 to 1 gallon of ground water had been evacuated Ground water temperature, ' pH, and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field data logs are included in Appendix B 22 GROUND WATER SAMPLE COLLECTION ' Ground water samples were collected from the monitoring wells using dedicated,disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume iImmediately upon retrieval,samples were transferred into chilled,40-milliliter(ml)EPA-approved ' Advanced GeoEnwonmentai,Inc