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n1 11 Quarterly Report - First Quarter 2004 WEST CLAY PROPERTIES 639 West Clay Street, Stockton, California 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 in Figure i Structures, well and boring locations are illustrated on Figure 2 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 2.0. PROCEDURES On 05 February 2004, fifteen 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 2 1 QUARTERLY GROUND WATER MONITORING Seventeen single-completed and two dual-completed ground water monitoring wells were purged and sampled on 05 February 2004 Seven of the wells (MW-6A, MW-8A, MW-1 IA, MW-12A, MW-13A, 14A and 15A) were shallow wells screened from approximately 10 to 35 feet below surface grade (bsg) Ten wells (MW-1, MW-2, MW-6B, MW-8B, MW-9, MW-11B, MW-12B, MW-1313, MW-14B and MW-15B) were deep wells screened from approximately 40 to 70 feet Well MW-3 and EW-2 were intermediate wells screened between 30 and 50 feet 2 1 1 Well Monitoring and Evacuation A Solinst water level meter was used to measure the depth to ground water in 22 wells relative to the tops of the well casings The ground water elevations and gradient were determined from this data (Table 1) Advanced GeoEnviroamental,Inc