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• C1 . Monitoring wells MW1 2 " PVC & MW3 4 " PVC well will be used for pumping the ground water using a pneumatic pump , to pump at approximately 0 . 5 to 1 . 0 gallons per minute . The pumps will deliver the water to a sediment control tank and then to the 1000 gallon treatment tank . Where approximately 300 gallons will be treated and air stripped for 5 hours prior to dumping to sewer at a 5 gpm rate . All discharged water will be metered and LEL monitored , with an alarm at the sewer clean out entry . Pounds/Day C4 . Removal of Total Petroleum Hydrocarbon (gasoline Range ) is estimated at 90%. Using the highest concentration found from either monitoring well MW1 or MW3 , prior to vapor extraction November 27 , 1990 , 720 mg/l is found in monitoring well MW3, See table 1 . 720 mg/l at 90% removal leaves 72 mg/l in the effluent. The BTEX concentrations were also obtained from the November 27, 1990 sampling of MW3. We estimate a higher degree of removal of these more volatile components of gasoline of approximately 98.7%. Benzene = 2.6 mg/1 At 98.7% removal = 0 .0338 mg/l Toluene = 3.4 mg/l at 98.7% removal = 0.0442 mg/l EthylBenzene = 1 .3 mg/l at 98.7% removal = 0.0169 mg/l • Xylenes = 13.0 mg/l at 98.7% removal = 0.0169 mg/l BTEX Total - 0.26 mg/l left in effluent Converting mg/l into lbs/gallon 1 mg X 3.785 X 0.0000022 lbs = 0.000008 lbs. 1 gal mg gal at a discharge rate of 1200 gal/day = 0.0096 lbs/day X concentration TPH at 72 (mg/1) x 0 .0096 lbs/day = 0 .69 lbs/day BTEX at 0 .26 (mg/1) X 0 .0096 lbs/day = 0.002 lbs/day