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R604 .UPDATE 18 5--12-1993 <br /> June, 1992 all these wells are below detection limits, <2 2 MPN, <br /> for fecal coliform. <br /> VAPOR EXTRACTION <br /> Vapor Recovery Results: <br /> The vapor extraction system was shut down on November 21, 1991 on <br /> completion of operation under Initial Variance #91-19 and 90 day <br /> Variance #91-20 . A total of 13 , 116 pounds of gasoline range <br /> hydrocarbons were removed from the_,soils and ground water beneath <br /> this site by that time <br /> The vadose zone vapor recovery wells (P1, P3-Swarm and EX) <br /> contributed little to the total recovered hydrocarbons during <br /> this time period: P1 = 1 3 pounds, P3-Swarm = 561 4 pounds and <br /> EX = 127 pounds . <br /> The system was restarted under the Authority to Construct Permit <br /> (AP 91-106) on March 31, 1992 . <br /> On July 21, 22, and 23 , 1992, four new vadose zone vapor recovery <br /> wells were installed and mana£olded to the recovery system As <br /> of February 23 , 1993 the new wells along with MW5 have produced <br /> 3851 4 pounds of gasoline range hydrocarbons, for a total <br /> recovery of 16967 .4 pounds . From February 23 , to March 15, 1993 <br /> 202 pounds of gasoline range hydrocarbons have been produced, as <br /> compared to the previous reported 506 9 pounds of gasoline range <br /> hydrocarbons from January 13 , to February 23 , 1993 , see Table 3 <br /> and Charts, Figures 6A through 6E of vapor recovery <br /> Vacuum -Influence <br /> As was stated earlier, vapor recovery has removed the lighter <br /> fractions of gasoline range petroleum hydrocarbons from the soil <br /> (through ethylbenzene) and has greatly reduced the petroleum <br /> hydrocarbons dissolved in the ground water beneath this site <br /> Figure 5 represents the vacuum influence generated from the <br /> vapor recovery system as measured before obtaining depth to <br /> ground water measurements on April 15, 1993 <br /> System Operation: <br /> Currently a flow rate that fluctuates between 70 cubic feet per <br /> minute and 94 cubic feet per minute is being maintained through <br /> the two blowers that are placed in series, prior to exhausting <br /> through 2 (in series) 110 gallon and two 85 gallon activated <br /> carbon vapor scrub units These are serviced by Ex,celtran and <br /> Cameron Yakima for change-out and rejuvenation From March 15, <br /> to April 23 , 1993 the system has operated 916 5 hours and <br /> recovered 387 pounds of gasoline range hydrocarbons (10 pounds <br /> per day) . <br /> page 3 <br />