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. Quarterly Report - First Quarter 2003 ' LANGSTON'S MARKET 15615 South 7' Street, Lathrop, California I10. INTRODUCTION I At the request of Mr James Langston of Langston's Market, Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 15615 South 7`h Street,Lathrop, California The scope of work included quarterly ground water monitoring and preparation of this report The location of the site and the immediately surrounding area are illustrated on Figure 1 Structures and monitoring well locations on the site are illustrated on Figure 2 Background information and details of previous investigation at the site were included in the report titledlnterim Secondary Source Removal and Monitoring Well Replacement,dated 05 October 1995 and several quarterly reports, prepared by WHF, Inc and the AGE-prepared Quarterly Report - Fourth Quarter 2002, dated 22 April 2002 2.0. PROCEDURES On 26 March 2003,a quarterly ground water monitoring event was performed at the site Field work was performed in accordance with California Regional Water Quality Control Board-Central Valley Region (RWQCB) and San Joaquin County Environmental Health Department (EHD) guidelines ' for investigating underground storage tank(UST)sites and sampling ground water monitoring wells, respectively I2 1 WELL MONITORING AND PURGING A Solinst water level meter was used to measure the depth to ground water in eight ground water monitoring 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 disposable bailer or a two-stage pump was used to purge each monitoring well of standing water(Appendix A) Monitoring well MW-1 was pumped dry after removing approximately 18 gallons of water Approximately 22 gallons from.well MW-2 and approximately 6 3 to 8 0 gallons were removed from the remaining wells 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 A Purged water was stored on-site in labeled, 55-gallon DOT-approved drums Following purging,the depth to ground water was measured to ensure that a mirumum of 80%well- volume recharge had been achieved prior to sampling Advanced GeoEnvironmcntal,Inc I