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A <br /> Area 2• <br /> For.the purpose of obtaining a conservative estimate of the mass of BTEX and TPHg in the vadose zone, the lateral <br /> k <br /> extent of petroleum impacted soil were assumed to be;the shape of an ellipse. The vertical extent of petroleum <br /> impacted soil was assumed to extend from 35 feet bgs to 48 feet bgs. The highest concentration of combined BTEX f <br /> and TPHg detected in soil;samples is 282.5 mg/kg and 1,900 mg/kg, respectively. Average concentrations of 84.6 <br /> mg/kg and 551.3 mg/kg of BTEX and TPHg, respectively, were used in mass balance calculations to provide a <br /> conservative estimate of the mass of BTEX and TPHg in the vadose zone. <br /> Area of ellipse (A) =IT(ySa)( '/,b) <br /> a=short axis of ellipse = 15' <br /> b=long axis of ellipse =32' <br /> Volume (V) =Ad <br /> d=depth interval= 12' f <br /> n=:soil porosity=50% <br /> A=II(%Z x 15')( %x 32') 4 <br /> = 377 ft2 <br /> V (377 ft2)( 12') <br /> =4,524 ft petroleum impacted soil <br /> Average BTEX concentration (Avbtex) Average TPHg concentration(Avtphg) <br /> t = 84.6 mg/kg =551.3 mg/kg <br /> 28.3 liters (1)= 1 ft 28.3 liters= 1 $3 <br /> 1.7 kg= 1 liter(l) 1.7 kg= 1 liter(1) <br /> lmg= IE-6 kg lmg= IE-6 kg <br /> Mass (M)=V x n x Avbtex 'Mass (M)=V x n x Avtphg <br /> M=(4,524 ft )( 50)(84.6 mg/kg) M= (4,524 ft )(.50)(551.3 mg/kg) <br /> 191,365 &mg/kg = 1,247,040 ft mg/kg <br /> (191,365 ft 3 mg/kg)(28.3 1/ft)(1.7 kg/l)( IE-6 kg) =(1,247,040 ft mg/kg)(28.3 1/ft)(1.7 kg/1)( IE-6 kg) <br /> 9.2 kg BTEX =60 kg TPHg <br /> Total Mass Area 1 and Area 2 <br /> M 9.7 kg BTEX M=82 kg TPHg <br /> M 21.4 IN BTEX M= 180.7 lbs TPHg <br /> i <br /> I <br /> � d <br /> v <br /> s:lenvironmentaA25291Ireportslirp.doc a <br />