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Quarterly Report - First Quarter 2002 <br /> LANGSTON'S MARKET <br />' 15615 South 71 Street, Lathrop, California <br /> 1.0 INTRODUCTION <br /> At the request of Mr James Langston of Langston's Market, Advanced GeoEnvironmental, Inc <br /> I (AGE)has prepared this quarterly report for the property located at 15615 South 7`h Street,Lathrop, <br /> California The scope of work included quarterly ground water monitoring and preparation of this <br /> report The location of the site and the immediately surrounding area are illustrated on Figure 1, <br /> structures and monitoring well locations on the site are illustrated on Figure 2 <br /> Background information and details of previous investigation at the site were Included in the report <br /> titledlnterim Secondary Source Removal and Monitoring Well Replacement,dated 05 October 1995 <br /> and several quarterly reports, prepared by WHF, Inc and the AGE-prepared Quarterly Report - <br />' Fourth Quarter 2002, dated 22 April 2002 <br />' 2.0. PROCEDURES <br /> On 13 March 2002, quarterly ground water monitoring event was performed at the site Field work <br /> lie was performed in accordance with California Regional Water Quality Control Board-Central Valley <br /> Region (RWQCB) and San Joaquin County Environmental Health Department (EHD) guidelines <br /> for investigating underground storage tank(UST)sites and sampling ground water monitoring wells, <br />' respectively <br /> 2 1 WELL MONITORING AND EVACUATION <br /> A Solinst water level meter was used to measure the depth to ground water in eight ground water <br /> tmonitoring wells relative to the tops of the well casings The ground water elevations and gradient <br /> were determined from this data (Table 1) <br />' After recording water level measurements,a disposable bailer or a two-stage submersible pump was <br /> used to evacuate each monitoring well of standing water(Appendix A) Approximately 15 gallons <br />' of water were removed from well MW-1, 28 gallons from well MW-2 and approximately 7 to 8 5 <br /> gallons from the remaining wells Ground water temperature, pH and conductivity were measured <br /> at regular intervals during the purge process using an Oakton water analyzer Field data sheets are <br />' included in Appendix A Purged water was stored on-site in labeled, 55-gallon DOT-approved <br /> drums <br />' Following purging,the depth to ground water was measured to ensure that a minimum of 80%well- <br /> volume recharge had been achieved prior to sampling <br /> Advanced CeoEnvironmental,Inc <br /> 1 <br />