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a <br /> carbon #1044 (85 gal. ) into #1 position, #1046 into #2 position <br /> 3 behind the two pumps in series. Vacuum extraction from MWl, MW5, <br /> EIC and P3. Ambient air injection into -wells MW2, MW4, MW6 and P1. - �- <br />? ri Obtain water sample from monitor well MW2 for TFH-BTEX analysis. <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 MW1, 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 Summary. Including the initial <br /> pilot study up through July 9, 1991, 6,891.92 pounds of gasoline <br /> range hydrocarbons have been removed from the soil and ground <br /> water at this site. Figure 7 shows the approximate outline of <br /> vacuum influence that is occurring at this site. <br /> DISCUSSION <br /> Over excavation of the tank field area and the three pump islands <br /> has removed the ma3ority of contaminated soil. The ground water <br /> plume that exists beneath the site, has been delineated in the <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 /> extraction is removing between 50 and 100 pounds of gasoline range - - <br /> s hydrocarbons a day at flow rates ranging between 81 and 90 cubic <br /> feet per minute (cfm) . Each vacuum extraction well has do orifice <br /> for measuring flow from that well with sample ports to obtain <br /> vapor sample for analysis. Individual wells have showed the <br /> t following range in concentirations and flow rates: <br /> WFZZ NUMBER TFH/DAY FLOW RATE <br /> POUNDS CFM <br /> r <br /> MW1 4-30 25-51 <br /> MW5 4-86 26-37 <br /> P3 1-4 2-4 <br /> Monitor wells MW1 and MW5, are ground water monitor wells, with <br /> vapor extraction occurring from the top of the sand pack at the 30 <br /> foot depth to top of ground water, in higher permeable areas. <br /> Whereas P3 is extracting vapors from the sand pack pl^ced from the <br /> 10 foot depth to the 40 foot depth in the overexcavated pea gravel <br /> page 12 <br />