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Quarterly Report - Third Quarter 2000 LANGSTON'S MARKET 15615 South 7' 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'Street,Lathrop,California The scope of work included quarterly groundwater monitoring ' 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 ' tltledlnterim Secondary Source Removal andMonrtoring 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 enacted at the site immediately '• The current quarterly ground water monitoring event was performed on 15 September 2000 Field work was performed in accordance with the San Joaquin County PHS-EHD and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of ' underground storage tank (UST) sites ' 21 MONITORING WELL PURGE PROCEDURES On 15 September 2000, a Solinst water level meter was used to measure the depth to ground water ' in the four 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 monitoring well of standing water Approximately 15 gallons of water were removed from well MW-1 (the well was pumped dry at 15 gallons), 30 gallons from well MW-2 and 8 gallons from ' wells MW-3 and MW-4 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 1 ' 2 2 COLLECTION AND LABORATORY ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers Each Iwater sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 ml 18% Advanced GeoEnwronmental,Inc. I