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I - 1 Quarterly Report - Fourth Quarter 2004 LANGSTON'S MARKET ' 15615 South 7" Street,Lathrop, Cahfornla ' 1.0. INTRODUCTION At the request of Mr James Langston of Langston's Market,Advanced GeoEnvlronmental, Inc ' (AGE)has prepared this quarterly report for the property located at 15615 South 7`h Street,Lathrop, California The scope of work Included the performance of a quarterly ground water monitoring event and preparation of this report The location of the site and surrounding area are Illustrated on ' Figure 1 Structures, soil borings, and monitoring well locations are illustrated on Figure 2 Details of previous investigations are summarized in Appendix A 1 2.0. PROCEDURES ' On 22 December 2004, a quarterly ground water monitoring event was performed at the site Field work was conducted in accordance with Central Valley Regional Water Quality Control Board ' (CVRWQCB) and San Joaquin County Environmental Health Department (EHD) guidelines for Investigating underground storage tank (UST) sites and sampling ground water monitoring wells, respectively 2 1 WELL MONITORING AND EVACUATION A Solmst water level meter was used to measure the depth to ground water in ground water monitoring wells MW-1 through MW-8 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 dedicated,disposable plastic bailer was used to evacuate ' (purge) each monitoring well of standing water Approximately 5 to 18 5 gallons of water were removed from wells MW-2 through MW-8 Monitoring well MW-1 was purged dry after 6 gallons ' of water had been evacuated Ground water temperature, pH, and conductivity were measured at regular intervals during the purge process using an Oakton water analyzer Field data sheets are included in Appendix B Purged water was stored on-site in properly labeled, Department of ' Transportation(DOT)-approved 55-gallon drums ' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Following purging, the depth to ground water was re-measured to ensure that a minimum of 80% ' well-volume recharge had been achieved prior to sampling Water samples were collected from each purged well using the dedicated, disposable plastic bailer Each water sample was transferred into three laboratory-supplied,40-milliliter(ml)volatile organic analysis(VOA)vials containing 0 5 ml ' Advanced GcoEnvironmental,Inc 1