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Modeling of surface water conditions has been utilized as set forth in Exhibit 8, Sediment Control Plan. <br />• Characteristics of surface runoff, peak flow, reservoir routing, sediment yield, and theoretical detention <br />time have been modeled using the techniques described in "Procedures for Determining Peak Flows in <br />Colorado" (USDA, SCS 1977) and "Applied Hydrology and Sedimentology For Disturbed Areas" (Ba~eld, <br />Warner and Haan 1981). These techniques have been incorporated into the DEPOSITS model, <br />which has been utilized in the design of treatment facilities for the underground mine. Finally, streamflow <br />and water quality in streams draining the general azea has been modeled using the WATBAL model, for the <br />purposes of the assessment of probable hydrologic consequences of mining on surface water, required by <br />Rule 2.05.6(3). Modeling of ground water conditions has been utilized in this application, specifically under <br />Rule 2.05.6(3) and in Exhibit 9, Aquifer Test Data. Dewatering, drawdown and solute transport <br />chazacteristics have been modeled using the analytical methods described in "Ground Water Hydraulics" <br />(Lohman 1979), "Selected Handheld Calculator Codes for the Evaluation of the Cumulative Hydrologic <br />Impacts of Mining" USDI. <br />r1 <br />LJ <br /> <br />PR 03-06 2.04-11.1 05/07/03 <br />