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<br />n~2155 <br /> <br />c. Alternative Three <br /> <br />Leq 55 dB (A) contours and zone of audibility for slope equipnent <br />remain the same along U.S. Highway 160 as they were generated for <br />Alternative TWo. The elimination of the back bowl developnent <br />reduces the total amount of area affected by noise sources but <br />does not change the total noise produced or the distance beyond <br />the pennit boundary that slope equipnent noise will reach. <br /> <br />C. BIOLCGlCAf, ENVIRONMENl' <br /> <br />1. Vegetation <br /> <br />a. Alternative One <br /> <br />Alternative One will have no iJ1llacts upon vegetation on the public <br />lands. Only the vegetation on the private land will be impacted <br />by this alternative as the result of land clearing for roads, <br />housing, golf courses, and other developnents. see Table IV-12 <br />for an estimation of impacts on the private land. <br /> <br />Landscaping requirements are an irrportant element of the Private <br />Land Developllent Plan (PUDM). Where new landscaping is required <br />the PUDM developllent guide specifies the use of native and <br />indigenous plant species. This applies to Alternative TWo and <br />Three as well. <br /> <br />b. Alternative TWo <br /> <br />Table rv-13 displays the acreages disturbed by the construction of <br />trails, chair lifts and roads for the proposed alternative on <br />public lands. Table rv-14 displays the tirrtler volumes expected to <br />be produced from public lands under this alternative. The <br />estimation is 9.7 million board feet (MMBF) of sawtimber or 19. 7 <br />thousand cords of firewood. <br /> <br />This alternative would i~ct an estimated 28 percent (639 acres) <br />of the total timber vegetation types (2275 acres) on public <br />lands. Eighty-seven percent of the impacted public lands acreage <br />is forested with a mosaic of aspen and conifer-daninated stands. <br />Vegetation clearing for ski area construction would be greatest <br />under this alternative. . <br /> <br />The greatest iJ1llact on public lands would be to the aspen <br />vegetation type. This type covers 1173 acres of pUblic lands. <br />This alternative would clear approximately 356 acres (30%) of the <br />aspen vegetation type. The corridors cleared for ski trails, <br />chair lifts and roads will open the canopy allowing for greater <br />species diversification. Aspen are shade intolerant and develop <br />primarily from adventive roots; as a result the removal of mature <br />trees allows aspen to regenerate along the ski trail edge. <br /> <br />193 <br />