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<br />T.b~J;;~i } s.lIlIIIiilj~riiii"~<lS<if flJD~~.~ii~tlv~iijJd "b1tiitlalillitlg~lJo~ .". ',",:',""',:',:',:",:"':,i',,: ,'.. .,.:,'..,.,',,:.:..) " . .. ... ~' <br />. .. ......... , , , <br />......, ,....,"..' ,'.."", . .. . <br />..... . <br />. ....... .. <br />.... . . . . . <br /> .. . . . . <br />Discipline Impacts Potential Mitigation <br />Alt.emative A Alternative B Alternative C <br />GI10LOGY AND Geologic resources and me Additional impacts under Alternative B In addition to the Steeplechase and Top lift lerminals near Loge Peak ShOll Id be located to <br />SOu..s management of these resources would include gravitational spreading. Highland Bowl lifts, graviuuional avoid gravitational cracks. LifiI building foundations <br />Geologic Hazanls within the Aspen Highlands Ski which may affect the stability of the top spreading would also consUtule a will be designed to withSland stresses and strains due <br /> Area would remain unchanged lerminals of the Steeplechase, Highland geologic hazard for the Highland to gravitational spreading. A network: of survey <br /> from the existing conditions, except Bowl and especially the Maroon Bowl and Ridge surface lifts and the Loge monuments should be placed in the Loge Peak area to <br /> those lhat occur as a rcsuh of lifu as weD as some of the higher towers Peak reslauranl and PHQ. monitor movements due to gravitational spreading. <br /> natural forces of nature. No funher of the Highland Bowl Lift and the <br /> development would be authorized foundation of the new PHQ near Loge Highland Bowl and Loge Bowl In talus areas, lift tower foundations will be anchored <br /> where gravitational spreading Peak. catwalks would face the same in stable rock. beneath actively moving layers of talus. <br /> appean; 10 be occurring. Only the dipslope hazanls as unda <br /> replacement of the Cloud Nine Lift The bottom terminal of Highland Bowl Altcmative B. but Temerity catwalk Slope cuts along catwalks/access roads should <br /> cou Id potentially resuh in slope Lift may also be affected by slow talus would not be affected by any generally not exceed g feet in height 10 reduce the risk <br /> inslBbility in the area near the creep. geological hazards, of slope failure. and tie-back rel8ining walls would <br /> Golden Barrel slides. but this effect have to be constructed to reduce fillslope instabilliy <br /> would be unlikely with proper The Steeplechase, Highland Bowl and Lower Temerity maintenance road and downslope disturbance. <br /> revegetation efforts. Loge Bowl catwalks traverse slopes would cross very steep colluvial <br /> averaging 60-70% and all three could be terrain especially where it traverses Implement rockfall prevention measures, and place <br /> affected by dipslope failures in several the Castle Creek Valley wall This signs warning visilors of the rockfall h87..ards. <br /> places if slope cuts undermine them. could result in deep roadcuts that <br /> undermine upslope stability. <br /> Rockfalls may also occur in some places. <br />Soil Hazards Soil resources and the management Due 10 the widespread dismbution of The widespread high erosion Design and construct a drainage system to handle <br /> of these resources within the Aspen slopes exceeding 40%, severe or high hazards associated with slopes spring runoff incorporating best management <br /> Highlands Ski Area would remain erosion hazards exist for at least part of ex~g40%.theH~hmnd practices (BMPs), <br /> unchanged from lhe existing all lift lines and catwalks included in this Bowl Temerity. Lower Temerity. <br /> conditions, except those that. occur allcmative. and Loge Bowl catwalksl Design and construct debris flows crossings to <br /> as a resuh of natural forces of mainlCrlance roads would be accommodate ]X)tential flows. <br /> nature. Mass movement hazard is less affected in a similar way as lhe <br /> problematic hut is also high for 67% of liftlines and catwalks included in Implement BMPs for c:rosion control and revegetation <br /> the Maroon Bowl Lift a1ignmenL Alternative B. on disturbed areas by the end of lhe construction <br /> season in which disnrrbancc occurs. <br /> POlential for slope failun: polentially Since additional snowmaking <br /> exists where snowmeh runoff is would be much less under <br /> concenlIllled 0010 slopes with a high A1tern..;"e C. the added risk of <br /> SIllUratioo potential, especially those Iandsliding would be lower unda <br /> associaJed with Leadville and possibly A1ternlllive C than Alternative B. <br /> Scout""'" soils, <br /> <br />Chapter 2 . The Altemalives <br /> <br />c::; <br />C. <br />I.J. <br />c~ <br />l": <br />~ <br /> <br />Comparison oj Alternalive.r <br /> <br />2-19 <br />