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' The measurements, calculations and assumptions discussed above were used in <br />' a predictive analysis to model the distribution of a plume of saline water <br />emanating from the Energy Mine No. 1 into the Twentymile Park ground water <br />basin. The OSM Plume Management Model (1981) was used to estimate <br />t concentrations of total dissolved solids (TDS) in milligrams per liter above <br />baseline concentration after 50 years of solute intrusion. The results are <br />' shown in Figure 19, Predictive Analysis -TDS Concentrations After 50 Years. <br />' Conclusions <br />Leachate studies conducted at Energy Mine No. 1 with mixed overburden <br />' spoil, and at the Foidel Creek Mine with underground waste rock, yielded similar <br /> results. Monitoring of actual leachate water at Energy Mine No. 1 yielded <br /> results which are comparable to the column leach tests. Ground water chemistry <br />' at the mine site will change from a predominantly sodium-sulfate type to a <br /> calcium- sulfate type. Total dissolved solids concentration in leachate waters <br />' will be approximately 2800 mg/1. This concentration is less than the maximum <br /> allowed for agricultural uses. Solute transport will carry leachate into the <br />' adjacent overburden aquifer. Dilution of leachate through intermixing with <br />ground water in the adjacent overburden aquifer will occur, and concentrations <br />' of leachate outside the permit and adjacent areas will be immeasureable. <br /> Therefore, the production of leachate will not affect the post-mining land use <br />' and water quality will not be degraded by the proposed disposal operations. <br /> <br /> <br /> <br /> <br />t <br />6 <br />C <br />