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1 <br /> 1 <br /> iQuarterly Report - Third Quarter 2001 <br />' Guardino and Crawford <br /> 5I7 West Fremont Street, Stockton, Cafifornia <br /> t1.0 INTRODUCTION <br />' At the request of Guardino 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 /> This quarterly report is prepared in accordance with Central Valley Regional Water Quality Control <br /> Board(RWQCB)guidelines for investigation of underground storage tank(UST)sites Background <br /> information is summanzed in Quarterly Report-June 1999, dated 27 September 1999,prepared by <br /> AGE <br /> 2.0. PROCEDURES <br /> Six ground water monitoring wells were purged and sampled on 24 August 2001 Field work was <br /> performed in accordance with San Joaquin County Public Health Servmces - Environmental Health <br /> '. Division (PHS-EHD)- approved Site Assessment Work Plan Addendum, dated 07 May 1998, and <br /> Work Plan Addendum, dated 04 February 2001, both prepared by AGE <br /> 2 1 WELL MONITORING EVACUATION <br /> ' A Solinst water level meter was used to measure the depth to ground water in six 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 evacuate (purge) each <br /> ' monitoring well of standing water Approximately 6 to 10 gallons of water (minimum of 3 casing- <br /> water volumes)were removed from each well Ground water temperature,pH and conductivity were <br /> measured at regular intervals during purging using a Hydac water analyzer Field sheets and data are <br /> ' included in Appendix A Purged water was stored on-site in labeled, 55-gallon DOT-approved <br /> 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 rnl 18% hydrochloric acid as a <br /> ' sample preservative After collection, the samples were properly labeled, placed in a chilled <br /> Advanced GeoEnviroi=cntal,Inc <br />.1 <br />