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1 y Quarterly Report - Fourth Quarter 2000 ' LANGSTON'S MARKET 15615 South 7'x Street, Lathrop, California ' 1.0. INTRODUCTION ' In accordance with the request of Mr James Langston of Langston's Market, Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 15615 South 7`i'Street,Lathrop,California The scope ofwork included quarterly ground water monitoring, ' a survey of well-head elevations and preparation of this report The location of the site and the Immediately surrounding area are Illustrated on Figure 1, structures and monitoring well locations on the site are Illustrated on Figure 2 Background Information and details of previous investigation ' at the site are included in the report titled Interim Secondary Source Removal and Monitoring Well Replacement, dated 05 October 1995 and several Quarterly Reports, prepared by WHF, Inc ' 2.0. PROCEDURES ' The San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) has directed by letter dated 08 May 2000 that quarterly monitoring be initiated at the site A survey of ' . four new well-head elevations and resurvey of existing well-head elevations were made on 06 December 2000 (results included in Appendix A) The current quarterly ground water monitoring event was performed on 29 December 2000 Field work was performed in accordance with the San ' Joaquin County PHS-EHD guidelines for sampling ground water monitoring wells and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites I 2 1 MONITORING WELL PURGE PROCEDURES IOn 29 December 2000, a Solmst water level meter was used to measure the depth to ground water in the eight wells relative to the tops of the well casings The ground water elevations and gradient ' were determined from this data (Table 1) After recording water level measurements, a two-stage submersible pump was used to purge each monitonng well of standing water Approximately 25 gallons of water were removed from well MW-1 (the well was pumped dry at 15 gallons),27 gallons from well MW-2 and 9 gallons from the remaining six wells Ground water temperature, pH and conductivity were measured at regular intervals during the purge process using a Hydac water analyzer Field data sheets are Included in Appendix A Purged water was stored on site in labeled, 55-gallon DOT-approved drums • Advanced GeoEnvironmental,Inc I