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r <br /> h <br /> . E <br /> Quarterly Report - Fourth Quarter 2003 <br /> GUARDINO AND CRAWFORD <br /> 'i 517 West Fremont Street, Stockton, California <br /> .I <br /> 1.0. INTRODUCTION <br /> Is 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). Thei <br /> site and its surroundings are illustrated on Figure 1. Structures,boring and monitoring well locations <br /> II <br /> are shown on Figure 2. Additional site background information is provided in Appendix A. 1! <br /> i p <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. !I <br /> 2.0. PROCEDURES <br /> Six ground water monitoring wells were purged and sampled on 03 December 2003.Field work was E <br /> performed in accordance with San Joaquin County Environmental Health Department (EHD) - 1 <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 /> II <br /> k. 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 /> wells relative to the tops of the well casings. The ground water elevations and gradient were �E <br /> determined from these data (Table 1). <br /> 'I <br /> After recording water level measurements, new dedicated disposable plastic bailers were used to <br /> evacuate(purge)each monitoring well of standing water. Approximately 4.25 to 9 gallons of water i f <br /> (minimum of 3 casing-water volumes)were removed from wells MW-1,MW-2,MW-3,MW-4 and ij } <br /> MW-6 and 2 gallons of water were removed from well MW-5 before it was purged dry. Ground <br /> water temperature,pH and conductivity were measured at regular intervals during purging using an i <br /> Oakton water analyzer.Field sheets and data are included in Appendix B. Purged water was stored <br /> on-site in labeled, 55-gallon DOT-approved drums. <br /> � r <br /> Advanced GeoEnvironmental,Inc. <br /> i <br /> I <br />