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j <br /> � r <br /> Quarterly Report - Third Quarter 2002 <br /> WEST CLAY PROPERTIES <br /> 639 West Clay Street, Stockton, California <br /> r� 1.0. 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 The site and the surrounding area are illustrated in Figure 1 Structures,well andboring <br /> Y locations are illustrated on Figure 2 <br /> This quarterly report has been prepared in accordance with Central Valley Regional Water Quality <br /> Control Board(CVRWQCB)guidelines for investigation of underground storage tank(UST) site's <br /> Background information is summarized in Quarterly Monitoring Report and Data Summary - <br /> December 1997 and Quarterly Report - October 1999, both prepared by AGE <br /> 2.0. PROCEDURES <br /> Field work was performed in accordance with San Joaquin County Environmental Health <br /> Department (EHD) and CVRWQCB guidelines for sampling ground water monitoring wells and <br /> investigating UST sites <br /> Eight single-completed and five dual-completed ground water monitoring wells and two ground <br /> ( water extraction wells were purged and sampled on 03 September 2002 Ten of the wells (MW-4, <br /> L MW-5, MW-6A, MW-7, MW-8A, MW-10, MW-11A, MW-12A, MW-13A and EW-1) were <br /> shallow-screened wells,screened from approximately 10 to 35 feet below surface grade(bsg) Eight <br /> IE, wells (MW-1, MW-2, MW-6B, MW-8B, MW-9, MW-I IB, MW-12B and MW-13B) were deep- <br /> screened wells, screened from approximately 40 to 60 feet Two wells (MW-3 and EW-2) were <br /> intermediate-screened wells, screened between 30 and 50 feet <br /> I E <br /> On 13 September 2002,purge water generated during previous monitoring events was disposed from <br /> -� the site by Amencan Valley Waste Oil, Inc <br /> I {�; <br /> 21 WELL MONITORING AND EVACUATION <br /> L On 03 September 2002 a Solinst water level meter was used to measure the depth to ground water M <br /> in the twenty wells relative to the tops of the well casings The ground water elevations and gradient <br /> t <br /> were determined from these data (Table 1) <br /> (_ Y After recording water level measurements, each of the twenty wells was purged of standing water <br /> l - by utilizing a down-hole pump or a dedicated disposable plastic bailer Between 5 1 and 60 gallons <br /> of water were removed from each of the wells(a minimum of 3 casing-water volumes per well) For <br /> IAdvanced GeoEnvironmental,Inc <br />