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_ 06 December 1995 <br /> AGE-NC Project No. 95-0100 <br /> Page 8 of 13 <br /> 5.1.4. MONITORING ACTIVITIES <br /> Monitoring of vapor extraction systems involves weekly measurement of vapor concentrations at the <br /> inlet to the destruction unit and periodic service and repair. Systems can be equipped with an <br /> automatic fax to alert the operator of system malfunction or failure. Vapor samples should be <br /> collected quarterly for laboratory analysis to track the efficiency of the remediation system. After the <br /> concentration of extracted vapors have decreased and stabilized after several months of operation, <br /> _ borings should be drilled to collect soil samples for quantitative analysis in the laboratory to check <br /> the effectiveness of the soil remediation effort. <br /> 5.1.5. FEASIBILITY STUDIES <br /> An 8-hour SVE pilot test was performed at the site. Results of the pilot test are discussed in section <br /> 4.0. and were interpreted to indicate favorable site characteristics for SVE, Based upon the results <br /> of the SVE pilot test, vapor extraction from well VE-1 and an additional vapor extraction well <br /> directly south of B2, should be sufficient to mobilize hydrocarbons within the entire plume of <br /> contamination. <br /> 5.1.6. DURATION <br /> — Typical duration of an SVE clean-up ranges from 6 nionths to 3 or more years. Ilowever, based upon <br /> the site lithology, the hydrocarbon concentrations in the impacted soil and the results of the SVE pilot <br /> test, a 12- to 18-month clean-up period is estimated for the Franklyn Cole site. <br /> An SVE system would be likely to operate at peak efficiency immediately following installation. <br /> Based on the concentrations of hydrocarbons recovered during the pilot test, we estimate that an <br /> T internal combustion system would reach the economic limits of efficient operation within 6 to 8 <br /> months. A thermal oxidation or catalytic oxidation system may be more efficient for the Franklyn <br /> Cole site. <br /> 5.1,7. COST <br /> The costs for SVE systems varies greatly, depending upon the particular system utilized for <br /> destruction of the extracted hydrocarbon vapors, i.e. thermal destruction, carbon adsorption, etc. The <br /> cost to operate, maintain, monitor and sample an SVE system at the Franklyn Cole site is estimated <br /> to average between $65,000 to $95,000 per year. <br /> Based upon an 18-month treatment period utilizing a thermal oxidation system, it is estimated that <br />