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Attachment to APF--20 Application GeoAudit CV 43C4 . 1. 1 Page 2 of 4 temperature of approximately 700° F, catalyst temperature of 1, 000 F, and a stack exhaust temperature of 600° F. The exhaust is 6 . 5 feet above surface grade, 0. 1.6 feet in diameter and has an operating velocity of 9, 480 feet per second. i In the carburetion system the air-to-fuel ratio (AFR) of the mixture is ad3usted for maximum contaminant destruction through the use of an exhaust oxygen sensor coupled to a fuel control module (FCM) . The FCM adds or subtracts natural gas from the fuel stream in order to maintain a 2% concentration of oxygen an the exhaust. By maintaining an oxygen surplus, the maximum amount of volatile material can be combusted. The combusted gases are exhausted to the atmosphere through a three way catalytic converter. The catalytic converter reduces the hydrocarbon, carbon monoxide and oxides of nitrogen emissions by better than 750, 75% and 600 , respectively. ' Calculated daily emmisions of the unit are as follows: Calculation Data Volume of contaminated soil. . . . . . . . . . 1, 182 cubic yards (yd3) Average level of contaminants: TPH. . . . . . . . 5, 780 mg/kg (ppm) Benzene. . . . . . . . . . 168 mg/kg (ppm) Toluene. . . . . . . . . . 615 mg/kg (ppm) Ethylbenzene. . 139 mg/kg (ppm) Xylene. . . . . . . . . . 779 mg/kg (ppm) ' Design efficiency of unit. . . . . . . . . . . . . . . . 900+ Weight of one yd3 of soil. . . . . . . . . . . . . 1, 225 Kilograms (Kg) ' One milligram (mg) soil. . . . . . . . . . . . 6 pounds soil . . . . . 2 . 2 x ZO- (lbs. ) 1 Days of operation. . . . . . . . . . . . . . . . . . . . . 365 Calculaton Formula Definition of variables: V yd3. . . . . . . . . . . . . .volume of contaminated soil in yards C mg/Kg. . . . . . . . . . . .contaminant concentration in mg/Kg