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Section 780.21(c) Continued. <br />I <br />Leachate Analysis List. The results of this testing are shown in <br />Table 66, Chemical Analyses of Leachate. <br />Raw data compiled from Dr. Gardner's leaching experiment consist of <br />electrical conductivity ("E.C.") readings at incremental stages of <br />the leaching process for each sample of overburden. These raw data <br />are presented in Table 64, Leaching Study Data. From these raw <br />data, a ratio of the volume of leachate to the volume of overburden <br />was selected by linear interpolation corresponding to 533 umhos/cm <br />for each sample. Based upon the amount of overburden represented <br />by each sample, a weighted ratio was calculated to be 0.703 liters <br />per kilogram, or 1.174 cubic feet of infiltrated precipitation per <br />cubic foot of spoil. <br />When the volume of water which has percolated through the spoil <br />• attains a volume equal to 117.4X of the volume of the spoil ma- <br />terial, the E.C. value will be at 533 umhos, the baseline level, <br />and no additional salt concentrations will occur above baseline at <br />that point. The time for this amount of water to percolate through <br />the spoil is determined from the rate of water infiltration into <br />spoil and a quantity of overburden according to the following <br />equation: <br />t = rv/i <br />Where: t time in years <br />r ratio of water to spoil <br />v volume of spoil in cubic feet <br />1 = infiltration rate of water from precipita- <br />tion into spoils in cubic feet per year. <br />Solving for t in the above equation at the baseline E.C. ratio of <br />. 1.174 yields 829 years by assigning the following values to the <br />remaining variables: <br />780-119 <br />