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lie <br /> Quarterly Report - Fourth Quarter 2002 <br /> A <br /> GUARDING AND CRAWFORD <br /> 517 West Fremont Street, Stockton, California <br /> ' l.0 INTRODUCTION <br /> iAt 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 has been prepared in accordance with Central Valley Regional Water Quality <br /> ' Control Board(CVRWQCB)guidelines for investigations of underground storage tank(UST)sites <br /> Background information is summarized in the AGE-prepared Quarterly Report-June 1999, dated <br /> 27 September 1999 <br /> r <br /> 2.0. PROCEDURES <br /> Six ground water monitoring wells were purged and sampled on 11 December 2002 Field work was <br /> performed in accordance with San Joaquin County Environmental Health Department (EHD)- <br /> approved Site Assessment Work Plan Addendum, dated 07 May 1998, and Work Plan Addendum, <br /> dated 04 February 2001, both prepared by AGE <br /> I1 � <br /> ` 2 1 WELL MONITORING AND EVACUATION <br /> ' A Solinst water level meter was used to measure the depth to ground water in the six monitoring <br /> u wells 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 new,dedicated disposable plastic bailers were used to <br /> ' evacuate (purge) each monitoring well of standing water Approximately 5 to 10 gallons of water <br /> (minimum of 3 casing-water volumes) were removed from each well Ground water temperature, <br /> ' pH and conductivity were measured at regular Intervals during purging using an Oakton water <br /> analyzer Field sheets and data are included in Appendix A Purged water was stored on-site in <br /> labeled, 55-gallon DOT-approved drums <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Prior to collection of ground water samples, the depth to ground water was gauged in each purged <br /> well to ensure that a minimum of 80%of the initial well volume had recharged Then a water sample <br /> was collected from each purged well using the dedicated disposable plastic bailer Each water <br /> ' Advanced GecEnvironmental,Inc <br /> P <br /> P <br /> L - - - - - <br />