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f <br /> JAN-16`31 1JED 12:04 -n �7VAX TECHNOLOGIES TEL 1,10:.436 4498 Poe ---- _-�----- <br /> k <br /> Table 1 . cont. Soil Vapor Concentrations. <br /> LOCATION DEPTH TVI FLOW RATE <br /> (feet) (ppm) (cfh) <br /> J 19-21 250 3 <br /> J 28-30 5,575 11 <br /> J 32-34 18,200 20 <br /> K 14.16 NO 2 <br /> K 28-30 450 2 <br /> N 14-16 Nn 2 <br /> O 28-30 5,740 20 <br /> MW-1 28-58 NO 20 <br /> MW-2 28-58 50 20 <br /> Mw-3 28-58 19,425 20 <br /> MW-4 28-58 625 20 <br /> MW-5 28-58 NO 20 <br /> LOCATION - Vapor probe or monitoring well location as indicated on <br /> Figure 1 . <br /> DEPTH - Perforated range of probe or screened interval of well. at <br /> sampling location, <br /> TVH - Total volatile hydrocarbons as propane (C3H8) on a volume/volume <br /> basis. <br /> FLOW RATE - Volumetric flow rate in cubic feet per hour extracted at the <br /> extraction point. <br /> NO - Below detection limit of 25 ppm. <br /> FEASIBILITY STUDY <br /> Procedures <br /> A Performance Test was conducted to evaluate subsurface air flow <br /> characteristics induced by a vacuum in the vertical and horizontal <br /> planes. The information obtained during the testing was used to assess <br /> the effectiveness of vapor extraction for remediation of soil at the <br /> subject site. <br /> A portable skid containing a vacuum pump, flow meters, and vacuum gauges <br /> was used on site. A rigid vacuum line was connected to a temporary vapor <br /> probe or monitoring well to create an extraction point. Three of the <br /> temporary vapor probes installed for the Soil Gas Survey and three <br /> existing monitoring wells were used as extraction points, A set volume <br /> - 4 - <br />