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Quarterly Report - Second Quarter 2001 <br /> � p <br /> I LANGSTON'S MARKET <br /> 15615 South 7TH Street, Lathrop, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr James Langston of Langston's Market, Advanced <br /> GeoEnviroTimental, Inc (AGE)has prepared this quarterly report for the property located at 15615 <br /> South 7h 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 are 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 <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 ground water monitoring event was performed on 28 June 2001 Field work was <br />' performed in accordance with PHS-EHD and California Regional Water Quality Control Board - <br /> Central Valley Region guidelines for sampling ground water monitoring wells and investigating <br /> underground storage tank (CYST) sites <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> IOn 28 June 2001, a Solmst water level meter was used to measure the depth to ground water in eight <br /> ground water monitoring wells relative to the tops of the well casings The ground water elevations <br />' and gradient 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 purge each monitoring well of standing water(see Appendix A) Approximately 17 gallons <br /> of water were removed from well MW-1,26 gallons from well MW-2 and between 6 5 to S 5 gallons <br /> from the remaining wells Groundwater temperature,pH and conductivity were measured at regular <br />' intervals during the purge process using a Oakton water analyzer Field data sheets are mcluded in <br /> Appendix A Purged water was stored on site in labeled, 55-gallon DOT-approved drums <br /> 1 <br /> 1 <br /> Advanced GeoEnvironmeatal,Inc <br /> 1 <br />