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<br />Aspen Highltllld.s Ski Area - Draft En.iro"""'nlallmpocr Slat"""nl <br />Table 2.6 COnlinued <br /> <br />Discipline Imp""ls Potential Mitigation <br /> A1temative A Alternative B Alternative C <br />WATERSHED The ASC has a joint water right of Instantaneous wal.er depletion required Instantaneous waler depletion None proposed. <br />RESOURCES t cfs guaranteed supply and 4.5 cr. by the snowmaking system propose for would be the same as under <br />Water Righls and intcrrupu"ble supply from Maroon Aspen Highlands would be higher 4.5 Ahemative B but the total annual <br />Depletions Creek.. Instantaneous water efs, and total annual water requirements water depletion to cover the 124 <br /> depletion for snowmaking would be to cover the 303 acres of snowmalctng acres of snow making would be 138 <br /> 1.08 cIs and the total annual water Iemlin would be 3t4 acre-feeL acre-feeL <br /> extraction would be 87 acre-feel <br />Water Yields Hillslopes and natural channels in Compared to current conditions. water Compared to current conditions. Design and construcl 8 drainage S}'Stem to handJe <br /> Maroon Cleek Watershed (MCW) yield would increase by 8% in lbe MCW water yield would increase by 1 % spring runoff incotporating BMPs, <br /> would stay at risk to erosion. and by 2% in lbe Castle Creek in lbe MCW only. In lbe MCW-A <br /> Watershed (CCW). hydrogrnphie area potential water <br /> yields would remain 11152 ECA and <br /> In lbe MCW-A hydrogrnphie area in lbe MCW-B hydrogrnphie area <br /> polential water yields would increase from t37 to t60 ECA. Road <br /> from 52 to 130 equivalent cleared acres lengths within lhe hydrographic <br /> (ECA) and in lbe MCW -B hydrogmphic areas studied would not change <br /> area from 137 to 305 ECA. Road relative to No Action. <br /> lengths would increase by 1.2 mile/sq <br /> mile (24%) in CCW-B. <br />Water Quality Drainage ditches lhat divert runoff There may be an increased risk of Due to the additional snowmaking Minimize construction-rela1.ed soil disturbance by <br /> from developed areas in MCW-B sediment deposition in Maroon Creek (48 acres more than under No limiting roads, using appropriate road, drainage, and <br /> sub-watershed would continue to due to higher erosion potential Action), there could also be a higher stream crossing designs and construction techniques. <br /> reduce water quality in Maroon associated. with eleva1ed water yield risk of sediment deposition in Construct roads when soils: are least suscepb1>le to <br /> Creek. unless they are armored. (mainly from new Snow making - 227 Maroon Creek. but this risk would erosion, sidecast placement on sidehills >60%, and <br /> acres) especially in lbe MCW -A and be less than under Alternative B. stabilize and revegetate disturbed areas along roads <br /> MCW-B h hie areas. and ski wavo;: within the vceetation season. <br />VEGETATtON Construction of previously About 925 acres (t6% oflbe anat~is A total of 683 acres of vegetation Develop a vegetation management plan (VMP) <br />General Vegelation approved developments would not area) would be affected, bu, 90% of lbis would be affected. Impacls to specifically designed for Aspen Highlands conditions <br /> involve large areas of vegetation would be either skied over (no alteration vegetation under Alternative C prior to any construction/development activities. <br /> disturbance but would consist of existing vegetation), receive low would approximare those under <br /> mainly of the removal or intensity g1ading (less lban t5% Ahemative B except thaI impacts lO Limit mea of vegetation/soil clearing on catwalks. and <br /> replacement of existing lifts. vegetation removal) or removal of vegetation in Maroon Bowl would Iiftlines and terminals and implement BMPs where <br /> avatanchlHlamaged trees. be e1iminaied and lbe Ridge Surface clearing is necessary. <br /> Lift would be added <br /> Medium or high intensity glading would For sensitive alpine tundra vegetation, avoid surface <br /> affect about 76 acres while consttuction Total effeels by vegelation l)1lC are diswrbance. and use snow retention fences on high <br /> of lifts and catwalks/accesS/cads would as follows (% of medium/high ridges or alternatively prohibil skiing and snow <br /> affect anolber 33 acres. intensity g1ading plus line clearing grooming during periods of inadequate snow cover <br /> in parenlbeses): (<8 inches or as determined during monitoring). <br /> <br />2-20 <br /> <br />Comparison of AlternaJives <br />