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t <br /> Coca-Cola Enterprises-West <br /> -� USTEC Job No. 90054.03 <br /> 5 fl CONCEPTUAL REMEDIAL SYSTEM DESIGN <br /> ... <br /> dial system as designed by USTEC. <br /> The fallowing sections describe the proposed reme <br /> 5.1 DESIGN APPROACH <br /> i <br /> ?. �F The remediation system proposed incorporates <br /> in-situ had°oc rbontcoont urinated soilslint <br /> the <br /> of petroleum hydrocarbon vapors from the residua y <br /> unsa <br /> kurated zone, The vapor extraction system (VES) will consist of a series of eight vapor <br /> extraction wells connected to a thermal oxidizer. The four existing vapor ext action wells(VEW-lete the <br /> ou h V EW 4)and four additional vapor extraction wells will be constructed to comp <br /> 1 thr g <br /> 4 VES. <br /> thermal oxidizer includes a regenerative blower,thermal oxidation bed,and process controls <br /> 4, The <br /> r l oxidizer will operate 24 hours per day at a <br /> that allow for unattended operation. The therma <br /> s Fahrenheit <br /> flow rate of up to 600 cubic feet per minute(cfm)• The oxidizer is designed to maintain a bed <br /> 3 r� <br /> temperature <br /> 0° ,at which point <br /> o€no less than 1,80destruction efficiency is at least <br /> 95% for the volatile hydrocarbons. <br /> 5.2 VAPOR EXTRACTION RATIONALE <br /> The hydrocarbon contaminated unsaturated zone extends down to depths of 75 feet bgs. For <br /> T y <br /> 1 r- in_situ vapor extraction is proposed to remediate the volatile hydrocarbon <br /> this reason, p p ears to exist <br /> components in the soil. The highest degree of hydro <br /> che arb <br /> on 1,000-gallont ga cline UST. <br /> rm <br /> between depths of 5 to 20 feet bgs around the area <br /> proposed VES will consist of a series of eight vapor extraction wells r°actonhwellsare <br /> ► g Thep p <br /> �n common pipe header to the blower. The locations of the proposed vapor ext <br /> Figure 15. The vapor extraction wells were located based on nd examinationof s vapor <br /> the <br /> l� extraction pilot tests, the existing vapor extraction well locations, <br /> l K analytical chemistry data. <br /> 18 <br />