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IQuarterly Report - February 1999 <br /> WEST CLAY PROPERTIES <br />' 639 West Clay Street, Stockton, California <br /> 3 <br /> I1.0. INTRODUCTION <br /> At the request of Ms Tina Mayhew of West Clay Properties,Advanced GeoEnvironmental, Inc { <br /> (AGE)has prepared this Quarterly Report for the property located at 639 West Clay Street, Stockton, <br /> California Ground water monitoring was performed on 09 February 1999 The site and the <br />' surrounding area are illustrated in Figure 1-Location Map Structures, well and boring locations are <br /> illustrated on Figure 2 - Site Plan <br />' The Quarterly Report is prepared in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> I Background information is summarized in the Quarterly Monitoring Report and Data Summary - <br /> December 1997, prepared by AGE <br />' 2.0. PROCEDURES <br />�. Six single-completed and two dual-completed ground water monitoring wells were purged and <br /> sampled on 09 February 1999 Field work was performed in accordance with San Joaquin County <br />' Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage <br /> tank (UST) sites <br /> 1 <br /> 21 MONITORING WELL PURGE PROCEDURES <br />' On 09 February 1999, a Solinst water level meter was used to measure the depth to ground water in <br /> each well relative to the tops of the well casings The ground water elevations and gradient were <br />' determined from these data(Table 1)' <br /> After recording water level measurements, a two-stage submersible pump was used to purge each <br /> Imorutoring well of standing water Monitoring well MW-613 was purged dry after approximately 4 <br /> gallons of water was removed Approximately 5 to 21 gallons of water were removed from each of <br />' the remaining wells For wells with ground water above the screened interval, ground water was <br /> purged from near the top of the water column to remove water trapped within the screened interval <br /> of the well casings Ground water temperature, pH and conductivity were measured at regular <br />' intervals during purging using an ICM water analyzer Field sheets and data are included in <br /> Appendix A Purged water was stored on-site in labeled, 55-gallon DOT-approved drums <br /> I a <br /> Advanced GeoEnviron mental,Inc <br />