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WP aoaapmg�*Z1 !2 MR-MOM �Y 1.H. KLEINFELDER&ASSOCIATES o The area was multiplied by the depth between each sampling 4 interval, to estimate the affected volume of soil within each x contour section. _ o An average concentration of one half the value between contour .<.` intervals was used to calculate the mass. For example, an overall average concentration of 9,00o mg/Kg was used for the area/volume between the 10,000 mg/Kg and 8,000 mg/Kg contour lines. This average value was multiplied by the estimated volume E8 I of soil, converted to an assumed dry density of 110 lb/ft3, to L� arrive at the approximate weight of the hydrocarbons present within each contour' section, a o The mass present at each contour section was added together for s each depth interval to estimate the mass present at these depths. o The volume of gasoline was then estimated by assuming a density of 6.68 lb/gal. G' i Table 7 sumaiarizes the results of the mass calculation. The calculations show that approximately 1680 gallons of gasoline is -� present within the affected area. A graphical presentation on the distribution of this gasoline by depth is depicted on Plates 54 and 55. e„ Plate 54 depicts kilograms of gasoline present at the individual depth intervals as well as the volume of affected soil. It is readily apparent that the highest concentration can be found at the 11-foot interval, the highest amount of hydrocarbons are present at the 16-foot interval and then decrease considerably at deeper intervals. Note that the ratio .r between the weight of hydrocarbon to the volume of affected soil decreased rapidly beyond the 16-foot interval. ---— =-- - -Plate 55 -portrays--the-_-same—information--as-the-bar--char-t-.but_as_.a-line,___ graph. As shown, the volume of rvcontaiAnated soil increases almost 38-87-43 14