Laserfiche WebLink
} <br /> 1 ti <br /> FINAL REMEDIATION PLAN FOR <br /> ARCO FACILITY 2093, TRACY, CALIFORNIA <br /> SAN JOAQUIN COUNTY, SITE CODE 1416 <br /> { This report is the Final Remediation Plan (Plan) for ARCO Facility 2093 (Site) located <br /> at 3425 Tracy Boulevard in Tracy, California. Figure 1 shows the location of the Site. The Plan <br /> is organized so that it basically follows the outline presented in the Final Remediation Plan <br /> 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 /> Executive Summary <br /> ARCO Products Company (ARCO) proposes to remediate gasoline contaminated soil and <br /> groundwater at ARCO Facility 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 if 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 /> ti Valley Unified Air Pollution Control District. Groundwater discharge, if needed, will be <br /> regulated under a National Pollutant Discharge Elimination System (NPDES) and local permits <br /> as required. An NPDES application is on file with the California Regional Water Quality Control <br /> Board, Central Valley Region and can be finalized if necessary. <br /> Twelve single completion groundwater monitoring wells(ATR-1 through ATR-12),one dual <br /> completion groundwater monitoring/air sparge well (SMW-1), seven dual completion soil vapor <br /> extraction/air sparge wells (VES-1 through VES-7), three air sparge wells (S-1 through S-3), and <br /> f <br /> one groundwater extraction well (TEX-1) exist at the site. All of the groundwater monitoring <br /> wells are currently sampled on a quarterly basis. During remediation nine of these wells will <br /> continue to be sampled on a quarterly basis. The effectiveness of the remediation will be <br /> measured by the concentration of constituents in these wells. <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. 1 <br /> The highest concentration identified in a soil sample was 1,700 milligram per kilogram (mg/kg) <br /> TPH-G in a borehole (ATR-4) near the USTs. <br /> { Benzene, ethylbenzene, toluene, and xylenes (BETX) have been identified in soil samples <br /> collected from the site with the highest concentrations occurring in samples collected from <br /> boreholes near the USTs. <br /> ' 4 MSIEN74Q3aEPOR7S7403-0I.R-1 <br /> QMS-PS7000 _ <br />