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IST Quarter 1993 SVES Report#695 <br /> Since inception of the program 1n 1991 a significant amount of contamination has <br /> S ce the ep p g g <br /> been removed from the subsurface with the program surpassing the 79,700 pounds <br /> extracted mark during the fourth quarter <br /> The system ran 65 days out of a possible 83 days This equates with a 78 percent <br /> operation efficiency <br /> The benzene to Total Petroleum Hydrocarbons as gasoline (TPHg) concentrations <br /> averaged at 0 66 percent for the I st Quarter 1993 <br /> II INDIVIDUAL MONITORING EVENTS <br /> 12 January 1993 Monitoring <br /> The system was down, but operated 14 days since 29 December 1993 Monitoring was <br /> performed on system influent, effluent, and extraction points Extraction points with Total <br /> Volatile Hydrocarbons (TVH) concentrations of 300 parts per million volume/volume <br /> (ppmv) and greater were open to system vacuum <br /> 25 January 1993 Monitoring <br /> r twenty-four hours a da for 13 days since 12 January <br /> The system was down, but operated y y Y <br /> 1993 System was down due to water Monitoring was performed on system influent, <br /> effluent, and extraction points Extraction points with TVH concentrations of 300 ppmv <br /> and greater were open to system vacuum The water knockout collected 55 gallons of <br /> water <br /> The highest emission rate of TPHg was recorded at 14 31 lb /day for the quarter The air <br /> permit allows for 18 ib /day <br /> 8 February 1993 Monitoring <br /> The system was down, but operated twenty-four hours a day for 13 days since 25 January <br /> 1993 Monitoring was performed on extraction points Extraction points with TVH <br /> concentrations of 200 ppmv and greater were open to system vacuum plus one exception <br /> MW-5 was open at 80 ppmv to Iower system vacuum and prevent water entering the <br /> 1 system The water knockout collected 44 gallons of water <br />