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L <br /> • <br /> EXECUTIVE SUMMARY <br /> ARCO Products Company (ARCO) proposes to remediate gasoline contaminated soil and <br /> groundwater at ARCO Station 2093, located at 3425 Tracy Boulevard in Tracy, California Soil <br /> contamination is concentrated in the capillary fringe and will be remediated by extraction of <br /> vapors from contaminated areas Extracted soil vapors will be treated by catalytic oxidation <br /> Groundwater is contaminated by low concentrations of petroleum hydrocarbons which will be <br /> remediated by sparging, in conjunction with vapor extraction Groundwater will only be <br /> extracted it sparging is not successful in remediating the contamination or if there is a need to <br /> lower the groundwater table to facilitate vapor extraction If groundwater is extracted. it will be <br /> treated using granulated activated carbon (GAC) <br /> Air discharges will be regulated under a permit to be issued by the San Joaquin County <br /> Valley Unified Air Pollution Control District Groundwater discharge, it needed, will be <br /> regulated under a National Pollutant Discharge Elimination System (NPDES) and local permits <br /> as required <br /> Twelve groundwater monitoring wells as the Site are currently sampled on a quarterly basis <br /> . During remediation seven of these wells will continue to be sampled on a quarterly basis The <br /> effectiveness of the remediation will be measured by the concentration of constituents in these <br /> wells <br /> INTRODUCTION <br /> This report is the Final Groundwater Remediation Plan (Plan) for ARCO Station 2093 (Site) <br /> located at 3425 Tracy Boulevard in Tracy, California Figure I shows the location of the Site <br /> The Plan is organized so that it basically follows the outline presented in the Final Remediation <br /> Plan section of Appendix A of the Tri-Regional Board Staff Recommendations for Preliminary <br /> Evaluation and Investigation of Underground Tank Sites. The preparation of the Plan was <br /> required by the San Joaquin County Public Health Services, Environmental Health Division <br /> Presently there are twelve monitoring wells and one well designed for groundwater <br /> extraction located at the Site <br /> SOIL REMEDIATION <br />. Low concentrations of gasoline range total petroleum hydrocarbons (TPH-G) are present in <br /> soil around the underground storage tanks (UST) and in the capillary fringe beneath the Site <br /> The highest concentration found was 1,300 milligram per kilogram (mg/kg) TPH-G in a borehole <br /> near the UST <br /> 74031REP0RTSREMEAATN PIN <br />