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or R604 :UPDATE 24 11-15-1993 limits, <2 . 2 MPN, for fecal coliform VAPOR EXTRACTION Vapor Recovery Results: The vapor extraction system was shut down on November 21, 1991 on completion of operation under Initial Variance #91-19 and 90 day Variance #91-20 A calculated 13, 116 pounds of gasoline range hydrocarbons were removed from the soils and ground water beneath this site by that time The vadose zone vapor recovery wells (PI, P3-Swarm and EX) contributed little to the total recovered hydrocarbons during this time period P1 = 1 3 pounds, P3--Swarm = 561 4 pounds and EX = 127 pounds The system was restarted under the Authority to Construct Permit tAP 91-106) on March 31, 1992 On July 21, 22 , and 23 , 1992 , four new vadose zone vapor recovery wells were installed and manifolded to the recovery system As of July 22, 1992 the existing vapor extraction system (MW5, P1, P3-Swarm and EX) had produced 13902 8 and the newly installed well VSB3 produced 3 6 calculated pounds of gasoline range hydrocarbons . Since that time only the newly installed wells (VSB3 , VSB5 , VSB9 and VSB11) and MW5 have been used for vapor extraction. As of the latest sampling (October 27, 1993) the new wells and MW5 have removed a calculated 4421 pounds of gasoline range hydrocarbons, for a total calculated recovery of 18073 pounds, see Table 3 and Charts of vapor recovery. { Vacuum Influence: As was stated earlier, vapor recovery has removed the lighter fractions of gasoline range (through ethylbenzene) petroleum hydrocarbons from the soil and has greatly reduced the petroleum hydrocarbons dissolved in the ground water beneath this site Figure 3 represents the vacuum influence generated from the vapor recovery system, as measured on October 27, 1993 . System Operation Currently a flow rate of 60 - 63 cubic feet per minute is being maintained (as of October 27, 1993) through the two blowers that are placed in series, prior to exhausting through 2 (in series) 110 gallon and one 85 gallon activated carbon vapor scrub units . These are serviced by Exceltran and Cameron Yakima for change- out and rejuvenation From October 6 to 27, 3993 the system has operated 302 hours and recovered 47 pounds of gasoline range hydrocarbons or approximately 3 . 7 pounds per day, which is approximately a 3815 of the production during the June, 1993 update status report of 9 . 8 pounds per day. s page 3 i