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1 ' 05 May 1997 i AGE-NC Project No 95-0112 ' Page 2 of 14 ' and sampling was summarized in a 16 October 1987 report prepared by Weiss Associates The boring logs as prepared by Weiss Associates are included in Appendix A ' According to information available to AGE, no further work was performed at this site until November 1991,when Earth Systems Environmental (ESE) attempted to collect water samples and measure the depth to ground water in wells MW-1 through MW-3 ESE reported that water levels had dropped to below the screened intervals in MW-2 and MW-3 and both wells were dry Wates and floating free product were present in MW-1, but no sample was collected The depth to water in MW-1 was 60 12 feet No further monitoring occurred in 1991 ' In January 1992, PHSIEHD required replacement of MW-2 and MW-3 Boa ings MW-4 and MW-5 were advanced to a depth of 75 feet bsg in June 1992 and completed 'kwth 25 feet of 2-inch diameter slotted PVC casing Low to moderate hydrocarbon concentrations were detected in water samples collected from both MW-4 and MW-5 Hydrocarbons were not detected in the soil samples analyzed Analytical results of soil samples are summarized on Table I Procedures and findings N�ere presented in a Monitoring Well Installation report prepared by Geological Audit Services, Inc (GAS) in August 1992 Boring logs are included in Appendix A ' Monitoring wells MW-6, MW-7.and MW-8 were installed by GAS in April 1993 The borings were advanced to 70 feet and completed with 20 feet of 2-inch diameter slotted PVC casing Petroleunn hydrocarbons were not detected during the well installations The results of this investigation defined the limits of impacted groundwater Procedures and findings were presented in a Quarterly Report - April 1993 prepared by GAS Boring logs are included in Appendix A 1 23 QUARTERLY GROUND WATER MONITORING Wells MW-1 through MW-3 were initially sampled and analyzed for TPH- 13 August 1987 Y g on g These wells were again sampled on 08 September 1987 and analyzed for BTE&X Ground water ' flow duectron was determined to be toward the northeast, as opposed to the southerly regional ground water flow direction ' Lodr municipal Well No 1 was located approximately 350 feet east of the site, and was likely responsible for the unexpected ground water flow direction According to Mr Fran Forkas of the Lodi Public Works Department, water samples collected from the municipal well in January 1987 ' T and August 1987 did -not`contain detectable hydrocarbons Lodr Municipal Well No I wase ` abandoned at some time prior to June 1992 No further sampling was performed between 1987 and ' June 1992 By 1992, wells MW-2 and MW-3 went "dry"because the ground water table dropped below the screened intervals 1