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1'I"l""^B l)U{.0U CHAPTER 4 . ENVIRONMENTAL CONSEQUENCES ~~~~~:~<*~>>;:;;~::;:r::;:::;:;:X::;.>:<:::;::.::~:m::;::::,~<:w.:r:'::;'.;.r';:w.:::~,~w.=1:;~;::~;::::<<:;:::::.:'~~'<<::::~~:::::;:;:;:::::;::'<<:;::::<:;'>;:;~:;;'~~'Z:-;:;:.;~;:~~;.:;':"{."~:::::::~~::<:::~;r.:::<<,:;:;':;<:.~':<<:.:::?::::;.;.:::.:r:;;,{;:::'~~::x.::::;:;:;:j:;:*-:.'::::;:::m::::::::,::::..<:::;:;::::::,=.::-:<:::.;:;::.:;:::.::;.j:;<::::": Water Demand/Reservoir Stora&e Requirements - Under this Alternative, a total reservoir storage capacity of 3,146 AF would be available as shown in Table 4-2. With implementation of Alternative C, the City could meet its present and 20-year projected future Water demands. It would not, however, be able to meet its long-term 40-year water demands. Alternative C also would not meet the projected future demands of the Mt. Werner district. The City and Mt. Werner would have to develop additional supplies of approximately 1,000 AF/year to meet 40-year projected demands. If the two entities were to combine, Alternative C would not meet future (2033) demands. A long- term fisheries pool would not be possible. Water Ouality - As stated previously, under Alternative C, Mt. Werner and the City would have to develop an additional water supplies to meet future 40-year projected demands. The additional water supply would not be equal to the Fish Creek supply in terms of water quality. Dependent upon the quality of the supply, extensive treatment could be required. Additional water quality impacts associated with the implementation of Alternative C are the same as those discussed under Alternative B. 4.3.3 Cumulative Impacts Increased recreational use of Fish Creek Reservoir and the continued use of the adjacent area for sheep grazing, could result in minor water quality impacts to the reservoir. Of concern are potential increases in the presence of fecal coliform (from humans and! or animals) and runoff of petroleum products from cars into the reservoir. According to the Forest Service, grazing is not permitted within 500 feet of the reservoir. Cumulative impacts associated with a reduction in water demand (resulting from the implementation of water conservation measures) would include cost savings associated with the decrease in water and wastewater treatment volumes. Water and wastewater treatment operation and maintenance costs would be reduced and costly treatment plant expansions could be avoided. Additionally, infrastructure capital and operation costs associated with the distribution of water and collection of wastewater could be reduced. With a metered billing rate, however, a reduction in water demand could also result in decreased revenues. 4.3.4 Mitigation and Enhancement Summary Mitigation of the erosional damage to the Puppy Dog drainage is suggested for all three alternatives. Future degradation of this drainage would be prevented with the implementation of Alternatives B or C. Under the No Action Alternative, the Forest Service would make a determination as to the steps necessary to correct this concern. Erosion control mitigation and stream monitoring during construction activities is recommended for the two action alternatives (B and C) to prevent stream sedimemation and preserve stream Water quality. A spill prevention and response plan would also be required within the construction operating plan. Additionally, a fisheries pool is recommended to maintain fisheries, visual resources, and the recreational atmosphere at Fish Creek Reservoir. This fisheries pool would be used as a back-up water supply during extreme drought years. :-;:':':N~,:.;:,:;:':-;'Xo:o..<::::;>>;::::vx-::=.:;:;:::::::,<:~-;:;;:;':;":~;W..yN~;:~":'M'-:>>:':::~;';'~V~'<,=::<:::-},..,>~;-::<"'y'w:<::':::::-:,..~-::::::;::;-"::::::;:;:;.:~n:::::.:-=".y..,:.:::<:X:-;.,:-x;:,:~:-w::;:~>:m.:.:..<:~;::,.x:::::.::::-.-}:'$:::::-,:,}::,::::...;.:;::<:<:.:::;.,:~,:::;:-,:~.,,:::::<...:-:.::,;-:.:N:'::' SeprembeT 1993 Page 4.11