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Basic Technical Assumptions <br /> 1. Simon Hydro-Search, Evaluation of Hydraulic and Hydrochemical <br /> Aspects of Proposed Bulkheads-Sunnyside Mine-San Juan County, <br /> Colorado (March 12, 1993) provides the range of water quality <br /> and flow rates for waters passing through the Sunnyside Mine <br /> after valve closure. <br /> 2. Zinc is the primary metal of concern to WQCD. Mitigation <br /> targets and goals were based on zinc loading because of that <br /> preference. <br /> 3. Calculated metal loading from stormwater events will be <br /> converted to daily loading for mitigation goals and loading <br /> comparisons. <br /> 4. There is a credit against calculated impacts to be calculated <br /> based on existing numerical discharge limits and background <br /> water quality. <br /> 5. Sunnyside Gold Corporation will be given credit for mitigation <br /> projects recently completed, in progress, or planned on their <br /> property. <br /> 4 - <br />