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FORMULAS AND METHODS <br /> Area of sections determined by AutoCAD from horizontal subsurface maps. <br /> Average thickness of sections estimated from vertical cross sections and soil borings. <br /> Vertical sections defined as surface to 22', 22'-27', 27'-38', 38'-total depth. <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 /> lyd3 = 27 ft' <br /> 1 yd = 764554.86 cm' <br /> x density of 1.5 grams/cm3 <br /> = 1.146833 x 106 grams <br /> 1 kg = 2.2046 lbs <br /> 1 gallon gasoline = 6.25 lbs <br />