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T • -E- VII. Protection of the Hvdroloaical Balance (2.05.6(3)). The discussion of probable hydrologic consequences presented by the applicant is qualitative and fails to address several possible hydrologic effects of the proposed operation. The discussion of probable hydrologic consequences should be expanded and quantified so that the Division has a clear understanding of just what effects the Foidel Creek underground mining operation would have on the existing hydrologlc system. The applicant should submit additional information for the following areas of concern. 1. The applicant has provided a qualitative discussion of the probable hydrologic consequences of the mining operation which addresses runoff and erosion from disturbed areas, the sediment load from disturbed areas. the dissolved salt load in mine discharges and possible effect on Foidel Creek, and a change in the ion balance of disturbed area surface water. The applicant has not provided an assessment of other possible hydrologic effects of the operation including water quantity effects on the Foidel Creek drainage, and water quantity and quality effects on the Fish Creek drainage. The assessment of probable hydrologic consequences needs to be expanded to provide a quantitative estimate of possible effects and to analyze these additional concerns. 2. Mine water (and possibly water from the dewaterinq well in Section 29) would be discharged to the Foidel Creek stream/alluvial aquifer system. The applicant should provide a worst case estimate of the quantity and quality of this discharge, and predict the effects upon surface flow regime, geomorphic stability of the stream, surface water quality, alluvial water levels, and alluvial water quality. Possible effects to downstream users of surface flow or alluvial water should be considered, and mitigations proposed if appropriate. The assessment should be carried downstream to the point that the changes in water quality and quantity become insignificant, including an assessment of the effects on Middle Creek and Trout Creek if appropriate.