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FORMULAS AND METHODS <br /> Area of lateral extent of impacted soil determined by AutoCAD from Figures 5 6 and 7. <br /> Average thickness of sections estimated from cross sections. <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 /> Density determined from average specific gravity and porosity of samples as determined by <br /> laboratory analyses. <br /> 1 yd' =27 ft' <br /> 1 yd' = 764554.86 cm' <br /> x density of 1.63 grams/cm' <br /> = 1.2462244 x 106 grams <br /> 1 kg = 2.2046 lbs <br /> 1 gallon gasoline = 6.17 lbs <br />