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Quarterly Report - Fourth Quarter 2002 <br /> LANGSTON'S MARKET <br /> 15615 South 7'h Street, Lathrop, California <br /> 1.0. INTRODUCTION <br /> At the request,of Mr James Langston of Langston's Market, Advanced GeoEnviroomental, Inc <br /> (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 WFIF, Inc and the AGE-prepared Quarterly Report- <br /> IFourth Quarter 2002, dated 22 April 2002 <br /> I2.0. PROCEDURES <br /> On 03 December 2002, a quarterly ground water monitoring event was performed at the site Field <br /> work was performed in accordance with California Regional Water Quality Control Board-Cential <br /> Valley Region (RWQCB) and San Joaquin County Environmental Health Department (EIID) <br /> guidelines for Investigating underground storage tank (UST) sites and sampling ground water <br /> monitoring wells, 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 /> monitoring 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, two-stage pump or a Watera pump <br /> was used to evacuate each monitoring well of standing water(Appendix A) Monitoring well MW-1 <br /> was pumped dry after removing approximately 7 5 gallons of water Approximately 21 gallons from <br /> well MW-2 and approximately 6 0 to 7 0 gallons were removed from the remaining wells Ground <br /> water temperature,pH and conductivity were measured at regular intervals during the purge process <br /> using an Oakton water analyzer Field data sheets are included in Appendix A Purged water was <br /> stored on-site in labeled, 55-gallon DOT-approved 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 GeoEnvirou mental,Inc <br /> I <br />