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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 />' 1 yd =27 ft' <br />' 1 yd = 764554 86 cm3 <br /> x density of 1 6 grams/cm3 <br /> = 12232878 x 106 grams <br /> 1 <br /> 1 kg 2 2046 lbs <br />' 1 gallon gasoline 6 17 lbs <br /> 1 gallon 42 diesel ; 7 00 lbs <br /> lie <br /> 1 <br /> 1 <br /> 1 <br />