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<br />I <br />i <br />I <br /> <br />Since a type B roadway (proposed) requires a minim\.un of 150 feet <br />of right-of-way, the 67 db (A) higlMay noise cOntour will be <br />contained within the proposed right-of-way (see Map! 25) . <br /> <br />The noise of slope vehicles associated with the i ski area will <br />primarily affect the acoustical environment of tpe slope. The <br />psychological impact of noise on the skiers w~ll be minimal <br />because SOllie amount of noise is expected and the epcposure tine of <br />a skier to slope vehicle noise is of short duratiofl. The primary <br />concern is, therefore, the noise inpact on ar~s not directly <br />associated with the ski slope because receivers at Ithese locations <br />will be more sensitive to noise generated on the slopes than <br />skiers. I <br /> <br />At each proposed lift location, an Leq = 55 dB(Al contour for a <br />typically "noisy" ski lift will extend to a distarjce in the range <br />of 100 feet. Leq 55 dB (A) represents the Stat~ of Colorado's <br />maximum allCMable Leq level in a residential area:. At each lift <br />location, the zone of audibility will extend to a aistance of 1000 <br />feet when the ambient noise level is 30 dB (A) and I where sightline <br />conditions exist. In the configuration of Alterruj.tive Two, zones <br />of audibility extend 600 feet east of the permit! boundary at the <br />base of the Trian;jle Peak back bowl lift and th~ 10-4 Peak back <br />bCMI lift, and 800 feet east of the permit boundar!y at the base of <br />north 10-7 Peak back bowl lift. None of the back I bowl lifts have <br />an Leq 55 dB(A) contour extending beyond the perm~t boundary. <br />I <br />At the Base Lodge location, the canbination of ndise generated by <br />three chair lifts and a gondola lift results! in a zone of <br />audibility extending 2000 feet to the west, and I an Leq 55 dB (A) <br />contour which extends to the eastern edge of UI.S. Higl'May l60. <br />The nortlMestern-1llOst lift has a zone of audipility extending <br />1000' to the northwest, and the Leq = 55 dB(A) cqntour extends to <br />the centerline of u.s. Higl'May l60, and wi~l therefore be <br />effectively masked by traffic noise. The ~outhwestern-most <br />chairlift has a zone of au<!ibility extending 700 teet west of u.s. <br />HiglMay 160 and an Leq = 55 dB(A) contour exterding to 100 feet <br />east of u.S. Higl'May 160. The chairlift which i~ adjacent to and <br />north of the southwestern-most lift has a zO\"le of audibility <br />extending 800 feet west of U.S. HiglMay 160 and fln Leq = 55 dB(A) <br />contour extending to lOa feet east of U.S. HiglMay 160. <br />I <br />The noise generated by sn<Mmaking machines can i~ct areas where <br />the line of sight distance is in the range Qf 250-1500 feet, <br />depending on the type of machine and the orientation of the nozzle <br />with respect to the receiver. For a typically I "loud" snowrnaking <br />machine the Leq = 55 dB(A) noise contours extenq 1500 feet in the <br />direction of the nozzle, 850 feet in the oppos~te direction, and <br />750 feet out from the sides. In the configuration represented in <br />Alternative Two, a worst case scenario was genetated by placing a <br />snowmaking machine at the base of each lifti with its nozzle <br />pointed toward the top of the mountain. <br /> <br />190 <br />