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.' Table S-5: Increases in Water Yield by Alternative (percentage). Acre Alternative Watershed I!ssl .A. .A. A. L .Q.. l!.. Spring Creek 640 0 0 16 5 9 0 East Pork BNSh 1,832 0 0 9 7 9 3 West Pork BNSh 3,140 0 NC NC NC NC NC Mainstem BNsh 1,050 0 2 3 2 2 I NC - No D......bl. Chao.. Wetlands Within the permit area, Alternative E would affect the most acres of wetlands, followed, in order, by Alternatives G, ;F, H, and B. Alternative E would have the most acres requiring a 404 permit (discharge of dredged or fill materials), followed, in order, by Alternatives H, F, G, and B. Off-site wetland treatments are associated with the East Village portal and infrastructure, all within the East Fork Brush Creek watershed. Table.5-6: Wetlancllmpacts by Watershe<l,and Alternative, Total and Treated Acres Requiring a 404 Pennit Altemative Total Total Treated Acres Watershed ~ .A. .A. A. L .2.. l!.. Spring Creek 55.7 0 1.5 18.7 0.8 1.3 0 East Pork Brosh 69.2 0 0.8 18.7 5.0 0.8 4.6 West Pork BNsh 114.5 0 1.4 1.6 1.6 0 2.1 MatnstemBNsh 31.3 0 1.4 1.0 1.7 0.5 1.6 Snowmass Creek 3.1 0 0 0 0 0 0 TOTAL 274.2 0 5.3 ' 40,0 9.1 20.6 8.3 Treated Acres Reauirinll a 404 Permit Spring Creek 55.7 0 0.9 7.1 0.1 0.4 0 East Pork BNSh 69.2 0 0.6 ' 4.9 2.0 2.0 2.0 West Pork BNsh 114.5 0 0.5 0 0.3 0 0.9 Matnstem BNsh 31.7 0 0.2 ' 0.8 0.7 0.5 0.5 Snowmass Cre.k 3.1 0 0 0 0 0 0 TOTAL 274.2 0 2.3 12.8 3.1 2.9 3.4 Snowmass Creek Ecosvstem All action alternatives propose using water from the SWSD diversion on Snowrnass Creek to supply water for domestic and snowmaking uses. Water withdrawals have the potential to adversely affect the stream ecosystem. With a seven cfs minimum flow, adequate water supply would be available in all alternatives except Alternative E. There would be short periods of time where the peak demands would far exceed the projected weekly mean daily use. Some buffering and storage capacity would be needed. The SWSD estimates that a storage of at least 1.5 rnrn Summary. 14