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WSP09805
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Last modified
1/26/2010 2:55:55 PM
Creation date
10/12/2006 3:56:17 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8200.765
Description
White River General
State
CO
Basin
Yampa/White
Water Division
6
Date
4/1/1997
Author
USFS
Title
Aspen Highlands Ski Area - Record of Decision
Water Supply Pro - Doc Type
Report/Study
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<br />A.spen High/ands Ski Area <br /> <br />AQUATIC RESOURCES <br /> <br />.. How might water withdrawals affect the aquatic resources? <br /> <br />The analysis in the EIS indicated that impacts to aquatic resources would occur primarily as a result of <br />water withdrawals. It was estimated that a flow of 22 cfs (or higher) at the Highway 82 bridge is <br />sufficient to avoid impacts to aquatic habitat. The only major winter diversions from Maroon Creek are <br />for snowmaking at Buttennilk and Aspen Highlands. Projections for late December. based On gage <br />records and monitoring in the winter of 1996-97. indicate Maroon Creek currently drops below this level <br />in 8 of 25 years. Implementation of this project at Aspen Highlands will cause the flow 10 drop below <br />this level in 1401'25 years. The actual occurrence interval of these lower !lows will and does depend on <br />how Aspen Highlands and Buttennilk choose to operate their snowmaking systems. <br /> <br />VEGETATION <br /> <br />.. Would the project result in an introduction of non-native plant species? <br /> <br />.. What effect will there be on any threatened, endangered, or sensitive plant species? <br /> <br />Impacts to vegetation would occur primarily through clearing of forest vegetation, grading and excavation <br />for lift corridors. catwalks, other facilities, and skier damage to plants within and protruding above the <br />snowpack. The EIS noted that ground disturbance could result in the introduction of noxious and <br />non-native plant species. Several mitigation measures are required to address this situation. The first is <br />that an extensive grading program analyzed in the EIS is not approved and ground disturbing activities <br />are to be greatly reduced. Second, native species must be used in the revegetation program for those areas <br />which are disturbed, including the use of weed tree hay for mulching. <br /> <br />Surveys of the Aspen Highlands Ski Area did not reveal the presence of any federally listed threatened <br />or endangered, or any Forest Service sensitive plant species. However, the analysis in the EIS notes that <br />suitable habitat does exist in the project area for only one sensitive species, the brownie lady slipper <br />(Cypripedium [asciculatum). Consequently, I have included as required mitigation that prior to any <br />construction, areas containing suitable habitat must be resurveyed for the occurrence of this plant. <br /> <br />WETLANDS <br /> <br />.. How would the development impact waters of the U.S., including wetlands, riparian areas, and <br />streams? <br /> <br />The analysis in the EIS estimated that implementation of the Steeplechase and Highland Bowl catwalks <br />and Steeplechase lift alignment would entail approximately 0.02 acres of dredge and fill affecting <br />jurisdictional wetlands. Before implementation can begin, the Aspen Skiing Company will be required <br />to obtain a permit under Section 404 of the Clean Water Act. This process may entail additional <br />mitigation for wetlands impacts under the jurisdiction of the Anny Corps of Engineers. <br /> <br />30 <br /> <br />Consideration oJEnvlronmental Issues <br />Jt.etlallds <br />
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