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Quarterly Report - Second Quarter, 2004 s WEST CLAY PROPERTIES - 3 639 West Clay Street, Stockton, California h ' 1.0. INTRODUCTION - At the request of�Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc ' (AGE)has prepared this quarterly report for the property located at 639 West Clay Street,Stockton, California The site and the surrounding area are illustrated on Figure I- Structures,well and boring locations are illustrated on Figure 2 1 ' `This quarterly report has been prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)' guidelines for investigation of underground storage tank(UST)sites Complete background information is presented in Appendix A s ' 2.0. PROCEDURES ' On 05 and 06 May 2004,sixteen single-completed and two dual-completed ground water,monitoring wells were purged and sampled ' Field work was performed in accordance with San Joaquin County Environmental Health Department (EHD) and CVRWQCB guidelines for sampling ground water monitoring wells and investigating UST sites 1 , 2 1 QUARTERLY GROUND WATER MONITORING ' Sixteen d single-completed and two dual-completed ground water monitoring wells were purged an sampled between 05 and 06 May 2004 Eight of the wells (MW-6A, MW-7, MW-8A, MW-11A, ' MW-12A,MW-13A,MW-14A and MW-15A)were shallow wells screened from approximately 10 to 35 feet below surface grade (bsg) Ten wells (MW-1, MW-2, MW-613, MW-8B, ,MW-9, MW-11B, MW-1213, MW-13B, MW-14B and MW-15B) were deep wells screened from approximately 40 to 70 feet bsg Wells MW-3 and EW-2 were intermediate wells screened between 30 and 50 feet bsg _ 21 1 Well Monitoring and Evacuation r A Solmst water level meter was used to measure the depth to ground water in a1122 wells relative to the tops of the well casings The ground water elevations and gradient were determined from these ' measurements (Table 1) 1 Advanced GeoEnvironmental,Inc