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MASS CALCULATIONS OF ' EXTRACTED HYDROCARBONS (Gasoline) Mel Bokides Petroleum, Inc. 501. W. Lodi Avenue, Lodi, California The hydrocarbon plass removed during the operating period can be calculated using the following ' equation: M= C•Q•t ' where: M= cumulative mass recovered (kg) C= vapor concentration (kg/m`) Q= extraction flow rate (m3/hr) ' t= operational period(hrs) The calculation for the first time period is provided as an example for the determination of mass/ ' volume of hydrocarbons removed over the reporting period. 03-19-02 to 04-15-02 ' using: C= 110 gg/l+ 110 gg/l/2 = 0.00011 kg/rn3 Q= 56 scfm(average) =74 rrl hr ' t = 15.7 hours (sum of known operation) 0.00011 kg/n1' • 94 rnr/hr • 15.7 hours= 0.16 kg of gasoline ' 0.16 kg of gasoline • 2.2046 lbs/kg= 0.35 lbs of gasoline to convert lbs of gasoline to gallons of gasoline, use 0.16 gal/lbs: 0.35 lbs of gal • 0.16 gal/lbs =0.056 gallons of gasoline 04-15-02 to 05-06-02 ' using: C= 110 gg/l+ 380 4g/1/2 = 0.000245 kg/rrI Q=69 scfm(average) = 116 d/hr t = 502 hours (sum of known operation) 0.000245 kg/nn • 116 r0hr • 502 hours = 14.3 kg of gasoline 14.3 kg of gasoline • 2.2046 lbs/kg= 31.4 lbs of gasoline to convert lbs of gasoline to gallons of gasoline, use 0.16 gal/lbs: ' 31.4 lbs of gal • 0.16 gal/lbs =5 gallons of gasoline 05-06-02 to 06-03-02 ' using: C= 360 gg/l+380 ggll/2 = 0.00037 kg/m3 Q= 67 scfin(average) = 113 n 3/hr ' t = 668 hours (sum of known operation) 0.00037 kg/m3 • 113 allIr - 668 hours =27.9 kg of gasoline ' 27.9 kg of gasoline • 2.2046 lbs/kg=61.5 lbs of gasoline to convert lbs of gasoline to gallons of gasoline, use 0.16 gal/lbs: 61.5 lbs of gal • 0.16 gal/lbs =9.8 gallons of gasoline Approximately 42 kg, 93 lbs or 14.5 gallons gasoline removed between March and June 2002 on average 1 lb of gasoline was removed each day of operation. ' Advanced GeoEnvtronmental,Inc.