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� i t <br /> s } I <br /> ` Quarterly Report - Third Quarter 2004 ` <br /> WEST CLAY PROPERTIES 1 <br /> I <br /> }d k` 639 West Clay Street, Stockton, California �} <br /> 1`.0. <br /> 'INTRODUCTION _ <br /> 'z + -At the request of Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental;Inc _- <br /> (AGE) <br /> nc _-(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 /> i <br /> 2.0. PROCEDURES , <br /> On 26 August 2004, nineteen single-completed and two dual-completed ground water monitoring <br /> wells were purged and sampled <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 /> r <br /> '2 1 QUARTERLY GROUND WATER MONITORING <br /> Nineteen single-completed and two dual-completed ground water mon>;toring wells were purged and <br /> sampled on 26',August 2004 Eleven of the wells (MW-4, MW-5, MW-6A, MW-7, MW-8A, <br /> ` MW-10, MW-IIA, MW-12A, MW-13A, MW-14A and MW-15A) were shallow wells screened <br /> from approximately 10 to 35 feet below surface grade (bsg) Ten wells (MW-1, MW-2, MW-6B, G ' <br /> MW-8B,MW-9,MW-11 B,MW-12B,MW-1313,MW-14B and MW-15B)were deep wells screened <br /> E� from approximately 40 to 70 feet bsg Wells MW-3 and EW-2 were intermediate{wells screened S <br /> between 30 and 50 feet bsg <br /> 2 1 1 Well Monitoring and Evacuation <br /> f <br /> A Solinst water' level meter was used to measure the depth to ground water in all 23 wells relative r <br /> to the tops of the well casings ,The ground water elevations and gradient were determined from these i <br /> measurements (Table,l) ` <br /> li <br /> I i <br /> t' a Advanced GeoLvironmental,Inc <br /> G I r <br /> ,I <br />