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a <br /> 1. H. KLEINEELDER&ASSOCIATES <br /> Y = 1.83 exp (-0.00786t)... ..........(2} <br /> Where: <br /> I <br /> y = lbs/hr removed <br /> t = time in hours <br /> An integration of this equation between 0 and 456 hours resulted in the <br /> 1 total removal <br /> of approximately 230 pounds of hydrocarbons. This <br /> corresponds to an overall removal rate of 7.8 lbs/da . The he cur <br /> rent <br /> hydrocarbon removal rate is hovering around 0.25 lbs TPH <br /> • per hour. These <br /> extraction rates appear to correspond very well to other previously <br /> reported findings (Coca et al, 1985; Corbin et al., 1985; Marley and Hoag, <br /> 1982; Sterrett et al.). <br /> Given the complex heterogeneity of the subsurface soil and differential <br /> permeability and transport of the hydrocarbons present i.n gasoline through <br /> the soil structure, it is very difficult to estimate the total quantity of <br /> hydrocarbons present in soil. However, based on the TPH concentration in <br /> soil at different boring locations and depths, it is possible to derive an <br /> integrated equation as follows: <br /> MY :' Cid/�NSYJNj� C`J� 1G. ...........(3) <br /> 1 r <br /> v <br /> Where: <br /> M = total amount of solvent present in soil (lb) <br /> Cij = concentration of solvent in ppm <br /> NY = number of sampling points in one boring location <br /> N� = number of boring locations <br /> = density of soil (lb/ft3) <br /> ---=-controk--voleune--(ft3) -------------------- ------------- <br /> 41-87-137 i2 <br />