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A <br /> Project 06020.01 June 11, 1991 <br /> RESULTS <br /> Limited Soil Gas Survey <br /> TVH concentrations recorded at the vapor .probes tested are given <br /> Table 1. The highest TVH concentration, 5,095 parts per million (ppm) <br /> was recorded at probe P-1 located at the north-west corner of they <br /> gasoline storage tank complex. The second highest concentration, 900 <br /> 'i ppm, was recorded at probe P-3 .located, south of. P-.1. ,TWremainder`of <br /> ,the vapor probes tested contained no detectable levels of hydrocarbon <br /> vapors. ., . . 7 <br /> I <br /> Limited Performance Test <br /> The results of the limited Performance Test are given in Table 2: <br /> The extraction volumes from extraction point P-1 ranged from 18.0 to° 24.0 F <br /> standard cubic feet per minute (scfm) with a- vacuum ranging from J.%to <br /> 9.0 inches of mercury ("Hg) . . A maximum capture radius of 17 feet was <br /> noted in the lateral plane. <br /> CONCLUSIONS <br /> TVH concentrations observed during the Soil Gas Survey indicate that,-the <br /> backfill materials at north-west corner of the UST complex contain <br /> tpetroleum hydrocarbon vapors: " <br /> The results of the Performance Test indicate that, if needed, vapor <br /> extraction is a feasible option for remediating the backfill material <br /> ., surrounding the underground storage tanks at the subject site <br /> i <br /> RECOMMENDATIONS } <br /> i <br /> Due to a tank replacement project scheduled at-this-time`foe-the�secona ,L <br /> half of 1991 no recommendations for the-subject site-are-given, at-,this <br /> time. <br /> Sincerely, <br /> EVAX Technologies, Inc. <br /> Matt Kaempf ' <br /> Site Investigator <br /> - 3 - <br /> ;, I <br />