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' , r J <br /> lieQuarterly Report - First Quarter 2002 <br /> WEST CLAY PROPERTIES <br />' 639 West Clay Street, Stockton, California <br />' 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 and boring <br />' 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) sites <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 /> Fourteen single-completed and two dual-completed ground water monitoring wells and two ground <br /> water extraction wells were purged and sampled on 27 February 2002 Nine of the wells (MW-5, <br /> MW-6A, MW-7, MW-8A, MW-10, MW-11A, MW-12A, MW-13A and EW-1) were shallow- <br /> screened wells, screened from approximately 10 to 35 feet below surface grade (bsg) Eight wells <br /> (MW-1,MW-2,MW-6B,MW-8B,MW=9,MW-11B,MW-'12B and MW-13B)were deep-screened <br /> wells, screened from approximately 40 to 60 feet Two wells (MW-3 and EW-2) were <br /> intermediately-screened wells, screened between 30 and 50 feet <br /> On 07 March 2002,purge water generated during previous monitoring events was disposed from the <br />' site by American Valley Waste Oil, Inc <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 26 February 2002 a Solmst water level meter was used to measure the depth to ground water in <br />' the twenty wells relative to the tops of the well casings The ground water elevations and gradient <br /> were determined from these data (Table 1) <br />' On 27 February 2002 each of the twenty wells was purged of standing water by utilizing a down-hole <br /> • pump or a dedicated disposable plastic bailer Between 5 and 62 gallons ofwater were removed from <br /> each of the wells(a minimum of 3 casing-water volumes per well) For the intermediate-and deep- <br /> Advanced GeaEnvironmental,Inc <br /> 1 <br />