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WSP00569
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Last modified
1/26/2010 12:26:38 PM
Creation date
10/11/2006 9:50:03 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8449.860
Description
South Platte Projects - Metropolitan Denver Water Study
State
CO
Basin
South Platte
Date
1/1/1985
Author
USACOE
Title
Metropolitan Denver Water Supply Environmental Impact Statement - Appendix 4 and 4b - Water Sources For Future Supply
Water Supply Pro - Doc Type
EIS
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<br />., <br /> <br />tions. Implementation of effective soil erosion control would minimize <br />soil transport into the streams and would substantially reduce poten- <br />tial aquatic life impacts. Increased fishing pressure from project <br />construction crews and future recreationists using public lands would <br />be a significant long-term impact on the existing fish resource. <br />Improved .access to currently remote stream reaches .facilitated by new <br />roads would be the primary reason for increased fishing pressure. <br />Potential mitigation measures could include restricting public vehicu- <br />lar access along service roads, periodically stocking affected streams, <br />and improving instream aquatic habitat. In stream habitat improvements <br />would range from $10,000 to $50,000 per mile. <br /> <br />Wetlands and Riparian Areas. Significsnt long-term effects would <br /> <br />occur on wetlands located downstream from the diversion points. <br /> <br />Approximately 570 acres of wetlands have a moderate to high probability <br /> <br />of being affected by reduced peak streamflows caused by project diver- <br /> <br />sions. Reduced peak runoff flows and, in some cases, base flows could <br /> <br /> <br />lesd to changes in wetland composition, size, and quality. Potential <br /> <br /> <br />mitigation options could include provisions for minimum instream flows, <br /> <br />development of replacement wetlands, alteration of operations to <br /> <br />compensate for dewatering influences, and enhancement of existtng <br /> <br />wetlands. The cost to mitigste wetlands impacts could vsry from $100 <br /> <br />per acre for minor operational adjustments to $5,000 to $10,000 per <br /> <br /> <br />acre for new wetlands creation. <br /> <br />~. Soil erosion would be a significant short-term impsct <br />during construction. Msny areas of disturbance possess high erosion <br />hazards because of excessive slopes, high susceptibility to water <br />erosion, and unstable soils once vegetation cover has been removed. <br />Also, the revegetation potential of disturbed soils is low because of <br />short growing seasons, cold temperatures, excessive slopes and soil <br />instability caused by substantial soil saturation during snowmelt. The <br /> <br />16 <br />
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