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/ Table 2,6 Co",j.ud Clr.aptrr 2 . The AltenuJlives Q <';';l 1-' w.:> t....:l -.1 Discipline Impacts Polenlial Mitigation Alternative A Alternative B Alternative C BIO-DIVERSITY clearing could also affect genetic The number of forest patches species during breeding period would be minimized (Continued) diversity by altering the ratio of would increase by 63 (20%) by limiting conslrUction 10 after July 15. and pbasing individuals of edge-tolcranl/forest- relative to the No Action c.onstruclion of differenllift pods over a number of interior species, and reducing habitat Allemalive (almost all in the 0-5 years, evenness. acre block size), The resulting change in spacial Alt.emative C could more severely configurations between habitat blocks fragment potential old-growth could produce genetic isolatiotl in some spruce-fir slands (wbicb tend 10 species. harbor more species than young - growth) between Highland Bowl and Sleeplechase lifts and along the egress route below Steeplechase Lift. Another difference could be inlroduction of exotic species when revegetating the Ridge and Hi.hland surface lifts, AQUATIC There would be no additional No fIsheries exist in the composite on- Since the Steeplechase catwalk. is Forest Service BMPs for erosion control must be RESOURCES impact to on-mountain streams rior mountain Maroon Creek and Castle excluded from AlLernalive C, adhered to minimize the sedimentation impacts on to Castle Creek, but intermittent Creek. sub-watersheds. Howe'ier, invertebmte impacts in the CCW. aquatic resources. sedimenlation of Maroon Creek construction of the Sleeplecha.se B I would be lower than under could occur following high Catwalk across the CCW-BI sub- Alternative B. Design and consuuct 8 drainage system using Forest precipitation events or heavy watershed could affect benthic macro- Service BMPs. snowmelt in early spring. This invertebrate communities in the stream. Increased seasonal water yields could negatively impact resident In addition. increased water yields could would be lower than under The stream CCW-Bl would be cuJverted at the rainbow and cutthroat trout and increase erosion and sediment input into Alternative B due to less proposed Sleeplechase Catwalk crossing. macro invertebrates. Maroon Creek and could increase the snowmaking and the subsequent likelihood of persislent sediment inputs decrease in the likelihood of Sedimentation of Maroon Creek inID the Roaring Fork River from sedimentation and water yield could produce shon-l<mI effects on Maroon Creek. whicb could affect impacts on invertebrates in Maroon the Roaring furl< River. fisheries in these rivers. and Castle creeks and the Roaring Fork River. Net annual water depletions for While net annual water depletion for snowmaking wouJd not advC7Sely snowmaking would be grell1er than impact aquatic resources. under the Alternative A. this is likely 10 have 1in1e effect on aquatic resources in Maroon Creek. Comparison of Alu-rnativu 2-25