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Geological technics Inc. <br /> 2741*var Xpad <br /> Modesto,Cdtfomia 95s5x <br /> (209)538-64241Yk;c#538-5852 <br /> Remedial Feasibility <br /> ' Work Plan <br /> Western Lift <br /> 3430 S. El Dorado <br /> Stockton, California <br /> i ' Project 358.3 <br /> September 28, 1993 <br /> (revised October 31,1995) <br /> 1 <br /> 1.0 INTRODUCTION <br /> The Western Lift site located at 3430 S. El Dorado in Stockton (Figure 1) has been the <br /> subject of environmental assessment and remediation. The resultant four reports <br /> ' are; 1) Preliminary Evaluation and Investigation of Hydrocarbon Contamination <br /> (Geological Audit, December 11, 1991), 2) Monitor Well Installation (Geological <br /> Audit, June. 26, 1992), 3) Groundwater Monitoring Well Installation Report <br /> (Geological Audit, January 8, 1993), and 4) Groundwater Monitoring Well <br /> Installation and Sampling, (Geological Audit, August 5, 1993). In addition, <br /> ' quarterly groundwater monitoring has been performed, most recently in June of <br /> 1995. The data set indicates that the horizontal and vertical extents of petroleum <br /> hydrocarbon contamination sourced from a leaking underground storage tank <br /> (UST) have been partially defined in three directions. Soil contamination has been <br /> removed to a depth of 34 feet and San Joaquin County Public Health Service, <br /> Environmental Health Division (PHS/EHD) is satisfied the soil is sufficiently <br /> ' contaminant free. Two groundwater monitoring wells, however (MW-1 & 4), <br /> continue to exhibit low levels of ground water contamination. <br /> I ' The Bank of Stockton has been directed by PHS/EHD to submit a work plan to <br /> evaluate the feasibility of various options to address the remaining ground water <br /> contamination at the site. The following section discuss the steps to be taken to <br /> ' acquire the information needed to perform the feasibility study. <br />