Laserfiche WebLink
RG04 UPDATE 13 11-24-1992 <br /> Vapor Recovery Results <br /> The vapor extraction system was shut down on November 21, 1991 <br /> upon completion of operation under Initial Variance #91-19 and 90 <br /> day Variance #91-20 A total of 13 , 116 pounds of gasoline range <br /> hydrocarbons was 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 this <br /> time period, P1 = 1 3 pounds, P3-Swarm = 561 4 pounds and EX = <br /> 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 , 4 new vadose zone vapor recovery <br /> wells were installed and manifolded to the recovery system As of <br /> November 17, 1992 the new wells along with MW5 have produced <br /> 1695 4 pounds of gasoline range hydrocarbons, for a total recovery <br /> of 15 , 603 72 pounds <br /> Vacuum Influence <br /> Soil contamination has been documented as being associated with <br /> the pump dispensers and the tank field as degraded gasoline range <br /> hydrocarbons Figure 3 shows the outline of the soil contaminated <br /> after evaluation of the confirmation soil sample boring samples <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 vapor <br /> recovery system as measured prior to obtaining depth to ground <br /> water measurements on November 17 , 1992 <br /> System Operation. <br /> Currently a flow rate that fluctuates between 68 cubic feet per <br /> minute and 88 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 activated carbon vapor scrub units These <br /> are serviced by Exceltran and Cameron Yakima for change out and <br /> re3uvenation From September 11, to November 17 , 1992 the system <br /> has operated 1612 hours and recovered 826 54 pounds of gasoline <br /> range hydrocarbons (12 3 pounds per day) <br /> page 6 <br />