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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 i <br />after valve closure. <br />2. Zinc is the primary metal of concern to WQCD. Mitiga~~ion <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 cal~:ulated <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 />• <br />• - 4 - <br />