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S p <br /> 1 Y <br /> Y i i r <br /> Ir I r '• 'Quarterly' Report - Fourth Quarter 2004 <br /> WEST CLAY PROPERTIES <br />' 639 West Clay Street, Stockton, California _ <br />' 1 0. INTRODUCTION y <br /> r � <br /> At,the request of Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvlronmental, Inc y <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 on 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 /> A summary of background information is presented In Appendix A <br /> 2.0. PROCEDURES , <br />' On 18 November 2004, twenty-three monitoring points were measured for depth to water On <br /> 19 November 2004, nineteen single-completed and two dual-completed ground water monitoring <br /> wells were purged and sampled <br /> lie 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 /> 21 QUARTERLY GROUND WATER MONITORING , <br /> Nineteen single-completed and two dual-completed ground water monitoring wells were purged and <br /> sampled on 19 Ndvember 2004 Nine of the wells (MW-6A, MW-7, MW-8A, MW-10, MW-11A, <br /> MW-12A,MW-13A,MW-,14A and MW-15A)were shallow wells screened from approximately 10 <br /> to 35 feet below surface grade (bsg) Ten wells (MW-1, MW-2, MW-6B, MW-8B, MW-9, <br /> MW-11B, MW-12B, MW-1313, MW-14B and MW-15B) were deep wells screened from <br /> approximately 40 to 70 feet bsg Wells MW-3 and EW-2 were intermediate wells screened between <br /> 30 and 50 feet bsg <br /> I2 1 1 Well Monitoring and Evacuation`' <br /> r <br /> A Solinst water level meter was used to measure the depth to ground water in all 23 wells relative <br /> I to the tops of the well casings The ground water elevations and gradient were determined from these <br /> measurements (Table'l) <br /> Advanced GeoEnvironmental,Inc <br /> I <br /> i <br />