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<br />B. PHYSICAL ENVIRONMENl' <br /> <br />1. Geology <br /> <br />a. Alternative One (No Action) <br /> <br />No development would take place on National Fore~t System land. <br />Natural processes, such as 1andsliding, erosion, apd alluvial and <br />talus deposition will continue. I <br /> <br />Occasional debris flCMS will reach u.s. Highway 1'60 at generally <br />the same location as the 1979 flCM, but othe~ locations are <br />possible. Debris flCMS, including more frequent Ismaller events, <br />will occasionally fill drainages with hundreds, iT not thousands <br />of cubic yards of mud resulting in channel bl ckage and high <br />tenq;>orary sediment loads downstream. <br /> <br />Portions of the proposed private land developme~t, as shown by <br />Maps 4 and 5, Chapter II, would be exposed to sam~ risk of damage <br />f ram debr is flCMS. " <br /> <br />b. <br /> <br />Avalanche hazard would not be an administrative concern if the <br />proposed ski area is not developed. There would, continue to be <br />same encounter hazards with cross country skiers U~ing the area. <br /> <br />Portions of the private land have been identified s having a high <br />risk rating in terms of unstable slopes (see "Engi eering Geologic <br />Investigations, Teal Ranch property near pagosa ~prings, Mineral <br />County, Colorado", Woodward - Clyde Consultants, peptember 1983). <br />These areas, specifically on the rrountain slope!s east of U.S. <br />Highway 160 and a portion of the western SlOpe[ of the private <br />land have been primarily zoned for open space f r single-family <br />detached housing. prior to any development of these or other <br />parcels, the developer has indicated that a their expense <br />detailed site-specific geotechnical studies will be completed. <br />This will be true for Alternatives Two and Three ~s well. <br /> <br />I <br />Alternative Two (Proposed Action) I <br /> <br />Conditions of a geologic nature which could i ct the proposed <br />ski area developnent include potentially stable slopes, <br />rockfall, and debris flCMS. SnCM avalanches also pose a potential <br />hazard in the area. <br /> <br />(1) . Potentially Unstable SlQpes <br /> <br />I <br />ApproxinatelY half of the National Forest System land <br />proposed for development is judged to have ~ relatively high <br />potential for natural and construction-induCfd slope failures <br />(see Map 9 - Section III). The remainder[ of the site is <br />judged to have a medium potential for unstabfe slopes. Areas <br /> <br />I <br />! <br /> <br />152 <br />