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R604 UPDATE 26 1-21-1994 <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 calculated 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 manifolded to the recovery system As <br /> of July 22, 1992 the existing vapor extraction system (MW5, P1, <br /> P3-Swarm and EX) had produced 13902 8 and the newly installed <br /> well VSB3 produced 3 6 calculated pounds of gasoline range <br /> hydrocarbons Since that time only the newly installed wells <br /> (VSB3 , VSBS, VSB9 and VSB11) and MW5 have been used for vapor <br /> extraction As of the latest sampling (December 30 , 1993) the <br /> new wells and MW5 have removed a calculated 4285 pounds of <br /> gasoline range hydrocarbons, for a total calculated recovery of <br /> 18191 pounds, see Table 3 and Charts of vapor recovery (Figures <br /> 5A 5F) The VES was turned off on December 30, 1993 for <br /> evaluation of site closuie <br /> Vacuum Influence <br /> As was stated earlier, vapor recovery has removed the lighter <br /> fractions of gasoline range (through ethylbenzene) petroleum <br /> hydrocarbons from the soil and has greatly reduced the petroleum <br /> hydrocarbons dissolved in the ground water beneath this site <br /> Figure 3 represents the vacuum influence generated from the vapor <br /> recovery system, as measured on December 30 , 1993 . <br /> System Operation <br /> Prior to turning the system off on December 30, 1993 a flow rate <br /> of 51 cubic feet per minute was being maintained through the two <br /> blowers that are placed in series, prior to exhausting through 2 <br /> (in series) 110 gallon and one 85 gallon activated carbon vapor <br /> scrub units These are serviced by Exceltran and Cameron <br /> Yakima for change-out and rejuvenation From November 30, to <br /> December 30, 1993 the system has operated 434 hours and recovered <br /> 55 pounds of gasoline range hydrocarbons or approximately 3 <br /> Pounds per day, which is approximately a 31s of the production <br /> during the June, 1993 update status report of 9 8 pounds per <br /> day <br /> page 3 <br />