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FORMULAS AND METHODS <br /> Area of lateral and vertical extent of impacted soil estimated visually from cross sections and soil <br /> data <br />' Average concentrations estimated from soil data and cross sections <br /> Calculated volumes and masses rounded for presentation on tables Calculations performed to a <br /> minimum of two decimal places <br />' 27 ft3 = 1d3 <br /> y , <br />' 1 yd3 soil = 1 69 tons <br />' 1 kg z 2 2046 lbs <br /> 1 gallon gasoline 6 17 lbs <br /> I1 gallon#2 diesel N 7 00 Is <br /> I <br /> lie <br /> I <br /> I <br />