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Kti+ <br /> L.a'k F <br /> recommendation for implementation of one of the alternatives discussed. <br /> SITE €NVESTIGATION <br /> i REMEDIAL €NVEST€GATION <br /> Procedures <br /> i •; <br /> A Soil Gas Survey was conducted to screen for the presence of hydrocarbon <br /> delineate the lateral and vertical <br /> vapors in the soil and, if found, <br /> boundaries of hydrocarbon vapors. Soil gases were extracted from <br /> temporary vapor probes installed for the investigation and five existing <br /> groundwater monitoring wells (Figure 1). The extracted soil gas was <br /> analyzed in the field for total hydrocarbon concentration as vapor (TVH) <br /> drcaron nalwith a <br /> using a Beckman Model 400 Total Hy <br /> Theoresblts Aereyrecordedpped Houston <br /> Flame Ionization Detector (FID). <br /> F;a Instruments chart recorder. <br /> F"F <br /> Results <br /> fx The highest TVH concentration, 19,425 parts per million (ppm), was <br /> recorded at monitoring well MW-3 in the vicinity of the former tank <br /> complex (Table 1) . Hydrocarbon concentrations as vapor were recorded at <br /> 8 feet only, with one exception. A vapor <br /> depths greater than 2 <br /> is concentration of 250 ppm was recorded at 19 to 21 feet below grade at <br /> Probe J. Probe J is in the vicinity of the former tank complex; TVH <br /> concentrations were recorded through the 32 to 34 feet depth interval at <br /> this probe. <br /> Table I. Soil Vapor Concentrations. <br /> LOCATION DEPTH TVH FLOW RATE <br /> (feet) (ppm) (cfh) <br /> G 28-30 100 3 <br /> 1 28-30 75 4 <br /> J 19-21 250 3 <br /> J 28-30 5,675 11 <br /> J 32-34 18,200 20 <br /> K 28-30 450 2 <br /> 0 28-30 5,700 20 <br /> MW-2 28-58 50 20 <br /> MW-3 28-58 19,425 20 <br /> ._ .. MW-.4.. .. ... .. 28-58 625 20 <br /> %.; - 2 - <br />