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Al <br /> L, Quarterly Report - Second Quarter <br /> Guardino and Crawford <br /> ' 517 West Fremont Street, Stockton, Californ'Au. 1 <br /> }I U ?POD' ENVIhujVjb1CjV i dar1L!i r <br /> 1.0. INTRODUCTION PERMIT/SERVICE <br /> At the request of Guardmo and Crawford Construction,Advanced GeoEnvironmental, Inc , (AGE) <br /> ' has prepared this quarterly report for 517 West Fremont Street, Stockton, California (the site) The <br /> site and its surroundings are illustrated on Figure 1 Structures,boring and monitoring well locations <br /> are shown on Figure 2 <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 /> Background information is summarized in the Quarterly Report - June 1999 dated 27 September <br /> ' 1999 and prepared by AGE <br /> ' 2.0. PROCEDURES <br /> Four ground water monitoring wells were purged and sampled on 12 June 2000 Field work was <br /> �! performed in accordance with the PHS-EH- approved Site Assessment Work Plan Addendum dated <br /> 07 May 1998 <br /> ' 2 1 MONITORING WELL PURGE PROCEDURES <br /> A Solmst water level meter was used to measure the depth to ground water in four wells relative to <br /> the tops of the well casings The ground water elevations and gradient were determined from these <br /> ' data(Table 1) <br /> After recording water level measurements, a submersible pump was used to purge each monitoring <br /> ' well of standing water Approximately 10 gallons of water (minimum of 3 casing-water volumes) <br /> were removed from each well, except for well MW-1, from which approximately 12 gallons of water <br /> was removed Ground water temperature, pH and conductivity were measured at regular intervals <br />' during purging using a Hydac water analyzer Field sheets and data are included in Appendix A <br /> Purged water was stored on-site in labeled, 55-gallon DOT-approved drums <br /> - 2 2 - COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative After collection, the samples were properly labeled, placed in a chilled <br />