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1 <br />' Quarterly Report - Third Quarter 2001 <br /> LANGSTON'S MARKET <br />' '15615 South 7tih Street, Lathrop, California <br />' 1.0. INTRODUCTION <br /> In accordance with the request of Mr James Langston of Langston's Market, Advanced <br />' GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 15615 <br /> South 7"Street,Lathrop,California The scope of work included quarterly ground water monitoring <br /> and preparation of this report The location of the site and the immediately surrounding area are <br />' illustrated on Figure 1, structures and monitoring well locations on the site are illustrated on <br /> Figure 2 <br />' Background information and details of previous investigation at the site were included in the report <br /> titled Interim Secondary Source Removal and Monitoring Well Replacement,dated 05 October 1995 <br /> Iand several quarterly reports, prepared by WHF, Inc <br /> 2.0. PROCEDURES <br /> The San Joaquin County Public Health Services -Environmental Health Division(PHS-EHD)has <br /> directed by letter dated 08 May 2000, that quarterly monitoring be implemented at the site The <br /> current quarterly groundwater monitoring event was performed on 24 September 2001 Fieldwork <br /> was performed in accordance with PHS-EHD and California Regional Water Quality Control Board- <br /> I Central Valley Region guidelines for sampling ground water monitoring wells and investigating <br /> underground storage tank (UST) sites, respectively <br /> 2 1 WELL MONITORING AND EVACUATION <br /> IA 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 /> Iwere 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(see Appendix A) Approximately 6 gallons <br /> of water were removed from well MW-1, 21 gallons from well MW-2 and approximately 6 gallons <br /> from the remaining wells Groundwater temperature,pH and conductivity were measured at regular <br /> I intervals during the purge process using an Oakton water analyzer Field data sheets are included in <br /> Appendix A Purged water was stored on site in labeled, 55-gallon DOT-approved drums <br /> IAdvanced GcoEnvironmental,Inc <br /> I <br />