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I F , <br /> I� Monitoring Well Installation and Remediation Feasibilty Testing Work Plan <br /> CHEROKEE TRUCK STOP _ <br />' 3535 East Cherokee Road, Stockton, California x <br /> I1.0. INTRODUCTION y <br /> At the request of Mr Ellis Cecchim, Advanced GeoEnvironmental;Inc (AGE) has prepared-this <br />�F work plan for the abandonment of monitoring well UST-1,installation of two clustered ground water <br /> monitoring wells to replace UST-1, soil and ground water remediation feasibilty testing, and <br /> feasibility evaluation of removal of petroleum hydrocarbon-impacted soil at the Cherokee Truck <br /> Stop facility located at 3535 East Cherokee Road, Stockton, California (Figure 1) <br />' This work plan has been prepared as required by the Central Valley Regional Water Quality Control <br /> Board(RWQCB)and San Joaquin County Environmental Health Department(EHD)by letter,dated <br /> 09 October 2001 (Appendix A), and has been prepared in accordance with the Regional Water <br /> Quality Control Board's Tri-Regional Board StaffRecommendations for Preliminary Evaluation and <br />' Investigation of Underground Tank Sates guidelines for investigations of UST sites <br /> r i <br />' 2.0. BACKGROUND <br /> lie Site assessment activities summarized below were originally reported in quarterly reports prepared <br /> by Environmental Science & Engingeering, Inc (ESE) between June 1990 and February 1997 and <br /> by AGE between March 1997 and May 2001 A list of reports referenced in preparing this summary <br /> was presented in Appendix A ofthe AGE-prepared Preliminary Assessment Report,dated 16 August <br /> 2001 The following is a summary of significant assessment activities conducted to date at the <br /> Cherokee Truck Stop site <br />' May 1990 - Review of EHD files for the site indicated fourteen soil bonn s B 1 through <br /> • y g ( g <br />' B 13,HA-1)were advanced near the UST,piping and dispenser areas to assess the lateral and ' <br /> vertical extent of impacted soil Petroleum hydrocarbon compounds were detected in 15 of <br /> the 20 samples collected from the borings Total petroleum hydrocarbons quantified as <br /> gasoline (TPH-g) and diesel (TPH-d) were detected at concentrations as high as 5,800 <br /> milligrams per kilogram (mg/kg)and 12,000 mg/kg, respectively Petroleum hydrocarbons <br /> in soil were found to extend to a depth approximately 50 feet below surface grade(bsg)near <br /> I the fueling island location Soil boring locations are depicted in Figure 3 A summary of soil <br /> sample analysis is presented in Tables 1 and 2 <br /> • September/October 1990-One ground water monitoring well(UST-1)was installed on-site <br /> to a depth of approximately 102 feet bsg 'to determine if petroleum hydrocarbons had <br /> impacted ground water The screen ofUST-1 was installed overlapping two coarse-grained <br /> intervals and may provide a vertical pathway for migration of impacted ground water <br /> Laboratory analysis of soil samples collected from the UST-1 boring contained detectable <br /> (0 concentrations of petroleum hydrocarbon compounds to a depth of at least 85 feet bsg <br /> Advanced GeoEnvi ron mental,Inc <br /> ' I <br /> I + r <br /> w <br /> I <br />