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"1W ... <br /> Mass Calculation of MTBE Remaining In Soil: <br /> An estimate of the areal extent of impacted soil surrounding the former UST area is made fzom <br /> _ samples collected from boring B1, 132, 133, B4 <br /> Based on the distance between the borings , a distance of 20 feet is utilized as an `average' radius <br /> of the hydrocarbon plume for the following calculation. The vertical distribution of the impacted soil <br /> appears to be between 20 and 45 feet in depth bsg. This volume was calculated from soil sample <br /> data. <br /> V„= 7cr-' •h -4 n(2Oft) • 25 ft = 31,400 ft3/ 27 ft'/yd' � 1163 yd' <br /> Converting 1.163 yd to tons <br /> _ 1,163 yd • 1.5 tons/yd3= 1744.5 tons <br /> Assuming an average concentration from soil samples collected from a depth of 20 feet bsg to 45 <br /> feet bsg, a value of 0.53 milligrams per kilogram as the "average" conccntration of total MTBE. <br /> 0.53 0kg to 0.00053 g/kg to 0.00000053 kg/kg and expressed as 0.00000053 tons/ton <br /> The mass is: <br /> _ 1744.5 tons of soil • 0.00000053 tons/ton MTBE <br /> 0.0009245 tons MTBE • 2, 000 lbs/ton <br /> 1.85 lbs MTBE converted with 0.453 kg/lbs <br /> 0.83 kg of MTBE <br /> Advanced Geofnvironmental,Inc. <br />