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i December lb, 1992 �� Unocal Service Station No 6981, Stockton, California Working To Restore Nature i a es col•lected_fmm borxng/weits B-IVMW-9 and B-18/PTW-1 were, submitted for,�7 leve }tses_to aid u1 well designs Results of the sieve analysis are shown in Appendix C Results of these analyses indicated that the aquifer material was a sandy, partially i cemented silt Following well installation, a technician from RESNA developed the monitoring wells Field methods for well development are described In Appendix A Ground-Water Monitoring RESNA began monitoring the ground water in wells MW-1 through MW-5 in February 1990, however, ground water has not been present in these wells since October 1990 After installation of additional monitoring wells in March and August 1992, the new wells were • added to the monitoring program The purpose of ground-water sampling is to monitor the fluctuations to concentrations of dissolved hydrocarbons and selected chemicals (if present) in ground water and to monitor the depth to water and the ground-water gradient The field methods for ground-water sampling are described in Appendix A The analvtical i results of samples collected from the wells are described In detail in the following Site Conditions section 1 GeoStrategies Inc conducted the second, third, and fourth quarter 1992 ground-water monitoring events (GeoStrategies Inc , August 4, 1992, October 7, 1992, and report in preparation) Their work included measuring depths to ground water, collecting ground- water samples from monitoring wells MW-6 through MW-13, and evaluating the ground- water flow direction and gradient beneath the site Copies of their second and third quarter reports and laboratory analytical reports for the fourth quarter were forwarded to RESNA and incorporated into this report 38032-10 7 1