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a- ram; _. e„.::. <br /> 3`�t �.ee <br /> .s "5 <br /> Y <br /> � r <br /> x- <br /> 1 <br /> carbon #104485 <br /> { gal.) into #1 position, <br /> behind the two pumps #1046 into #2 position <br /> in series. Vacuum extraction from MWl, MW5, <br /> EX and P3. Ambient air injection into wells MW2 <br /> Obtain Nater ;;ample from monitor well MW2 for TFH-BTE$ talnWalysis. <br /> JULY 9, 1991 <br /> Take carbon #1044 off line for rejuvenation with the „cyclo <br /> Purge", and place carbon #R1046 at #1 and R1042 as #2, disconnect <br /> one blower to reduce flow into carbon. Vacuum extraction from <br /> wells MWI, MW3, MW5, EX and P3. Ambient air injection into wells <br /> MW2, MW6 and P1. <br /> SUMMARY <br /> The hydrocarbon production from the above chain of events can be <br /> found on Table 3 - Vapor Recovery Including Summary. <br /> Pilot study up through July 9, g the initial <br /> 1991, F,,Bgl, <br /> range hydrocarbons have been removed from the psoils andgasoline <br /> water at this site. Figure 7 shows the approximate outlineo of <br /> vacuum influence that is occurring at this site. <br /> i DISCUSSION <br /> Over excavation of the tank field area and 'the three pump islands <br /> has removed the majority of contaminated soil, <br /> The round <br /> plume that exists beneath the site, has been delineated inwater <br /> north, east and west directions. Once the landowner decides the <br /> disposition of the site (demolish the buildings, etc.) further <br /> study will be done to the south of MW2 and MW5, Interim vapor <br /> 1 extraction is removing between 50 and 100 pounds of gasoline range <br /> hydrocarbons a day at flow rates ranging between 81 and 90 cubic <br /> feet per minute (cfm) . Each vacuum extraction well has an <br /> for measuring flow from that well with sam le for <br /> Ports to <br /> vapor sample for analysis. Individual wells obtain <br /> have showed the <br /> following range in concentrations and flow rates: <br /> WELL NUMBER TFH/DAY <br /> POUNDS FLOW RATE <br /> r. CFM <br /> 6 MW1 4-30 <br /> MW5 4„86 25-51 <br /> P31..4 26-37 <br /> 2-4 <br /> - ---- - -Monitor--wells-MW1 and 1 - . are ground water monitor wails, <br /> -- <br /> vapor extraction occurring from the top of the sand pack at�thelt30 <br /> foot depth to top of ground water, in higher <br /> Whereas P3 is extracting vapors from the sand packermpla� �defromethe <br /> 10 foot depth to the 40 foot depth in the overexcavated pea gravel <br /> page 22 <br />