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I <br /> • Quarterly Report - First Quarter 2001 <br />' LANGSTON'S MARKET <br /> 15615 South 7" 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 /> I 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 /> titled Intenm 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 ground water monitoring event was performed on 29 March 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 (UST) sites <br /> I <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> IOn 29 March 2001, a Solinst water level meter was used to measure the depth to ground water in <br /> eight ground water monitoring wells relative to the tops of the well casings The ground water <br />' elevations and gradient were determined from this data(Table 1) <br /> After recording water level measurements, a two-stage submersible pump was used to purge each <br /> monitoring well of standing water Approximately 25 gallons of water were removed from well <br /> MW-1, 30 gallons from well MW-2 and between 7 5 to 9 gallons from the remaining wells Ground <br /> water temperature,pH and conductivity were measured at regular intervals during the purge process <br /> using a Hydac water analyzer Field data sheets are included in Appendix A Purged water was stored <br /> on site in labeled, 55-gallon DOT-approved drums <br /> Advanced GeaEnvironmentai,inc <br /> I <br />