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E •" <br /> C <br /> PROJECT 02510.01 January 31, 1991 <br /> concentrations, 7,300, 5,000, 3, 125, and 1,300 ppm, were found at <br /> monitoring wells MW-10, MW-5, MW-19, and MW-28, respectively. <br /> Depth to groundwater measurements indicated that all wells tested were <br /> dry. <br /> 1 Performance Test <br /> The results of the Performance Test are given in Table 2. Extraction <br /> volumes from the monitoring wells tested ranged from 17.0 to 22.5 <br /> standard cubic feet per minute (scfm) with vacuums ranging from 1.5 to <br /> 4.5 inches of mercury ("Hg) . A maximum capture radius of 110 feet in the <br /> lateral plane and 64.5 feet in the vertical plane was noted. <br /> Water level measurements taken at selectedtime intervals during <br /> Performance Testing indicate that localized upweiling of groundwater was <br /> not recorded at the wells tested. <br /> • CONCLUSIONS <br /> Based on the TVH concentrations from the Soil Gas Survey, and the flow <br /> rates and capture radii observed during Performance Testing, vapor <br /> extraction is a viable option to remediate the soil at the subject site. <br /> Assuming an average concentration of 5,000 ppm and a flow rate of 100 <br /> scfm, approximately 82 pounds per day of hydrocarbons could be removed <br /> from the soil at the subject site. <br /> - 3 - <br />