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Page S-18 Summary February 2000 • • • Table S-1 Summary of Impacts by Altemative for Each Issue Issue/Concern Alternative A B C D Stream Sedimentation None-no mining Low-Moderate Low-Moderate Low from lease tracts or exploration Water Quality Degradation None-no mining Low Low Low from lease tracts or exploration Impacts to Threatened and None-no mining Negligible Negligible Negligible Endangered Aquatic Species from lease tracts or exporation CULTURALRESOURCES Impact to Cultural and Historic Sites None-no mining Low Low Low from lease tracts or exploration GEOLOGY/SUBSIDENCE Potential Effect to Cureranti-Rifle None-no mining None None None 230/345 kV Electric Transmission from lease tracts line or exploration Potential Effect to Terror Creek None-no mining low Low Low Reservoir from lease tracts or exploration Potential Effect to Terror Creek None-no mining Moderate Moderate Negligible from lease tracts or exploration Potential Effect to Hubbard Creek None-no mining Moderate Moderate Negligible from lease tracts or exploration Potentiafto Aggravate Landslides None-no mining low Low Low from lease tracts or exporation Land Use Acres Disturbed (total) Not Applipble to 33.5 33.5 33.5 (ease tracts or exploration Land Disturbed by Ownership (%) Not Applicable to BLM lease tracts 26 27 .27 Forest Service 59 62 62 Private 15 11 11 Noise` Noise Effects From Surface Low -Moderate Low -Moderate Low -Moderate Low -Moderate Facilities Noise Effects From Coal Trucks Low -High Low -High Low -High Low -High Noise EffecLS From Coaf Trains Moderate -High Moderate -High Moderate -High Moderate -High ` Noise effects very based on distance from the noise source.