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Ms Linda Turkaue October 17, 1994 - Page 2 Environmental Health Division of the San Joaquin County Public Health Services Department - required a preliminary site assessment to be performed ' In August 1991, Nachant Environmental, Inc supervised the drilling three soil bonngs to depths b p between 40 and 50 feet below ground surface (bgs) Detectable concentrations of petroleum hydrocarbons were present in all borings In July 1992, Tank Protect Engineering supervised the drilling of five soil borings and the installation of five monitoring wells (MW-1 through MW-5), each to a depth of approximately 90 feet bgs Analytical results of soil and ' groundwater samples collected as part of the well installation procedure identified petroleum hydrocarbons constituents in soil and groundwater samples from Monitoring Wells MW-1 through MW-4 HETI dnlled three soil bonngs and installed three monitoring wells (MW-6 tthrough MW-8) during December 1993 Analytical results identified petroleum hydrocarbon constituents,in the groundwater sample collected from Monitoring Well MW-7 ' Depth to groundwater beneath the site is approximately 81 feet below grade and flows in a southerly direction under a gradient of 0 0004 feet/foot Proposed Scope of Work E-Z Serve and Brown and Caldwell propose to conduct the following scope of work in accordance with the recommendation listed in the Tri-Regional Board Staff Recommendations ' for the Preliminary Evaluation and Investigation of Underground Storage Tank Sates, dated August 10, 1990 and the State Water Resources Control Board Petroleum Underground Storage Tank Cleanup Fund Corrective Action Guide, dated June 1992 ' Brown and Caldwell proposes to conduct an AS/SVE pilot tests on-site Groundwater monitoring well MW-1 will be used as the SVE test well, and wells MW-2, MW-3, MW-4 and 1 MW-5 will be monitored dunng the SVE test In addition Brown and Caldwell will install one dual-completion well (AS-1) approximately 20 feet to the west of MWA Well AS-1 is expected to be used as part of the AS/SVE remedial system and will also be monitored during ' the SVE test Dunng the installation of Well AS-1, soil samples will be collected at 5-foot intervals. beginning 5-feet below ground surface (bgs) and continuing to the total depth of the bonng, for possible laboratory analysis Following the completion of the SVE test, Well ASA will be used as the AS test well and wells MW-1, MW-3, and MW-4 will be used to monitor the progress of the combined AS/SVE rtest The AS/SVE pilot test will be conducted over the period of approximately two days Permits for conducting the proposed pilot test will be obtained prior to commencing field work e\erserve\l00966\workp[an hplaserIlID Brown and Caldwell Consultants