PRRIP Draft Environmental Impact Statement Summary

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Summary Summary of Impacts of Each Alternative Compared to the Present Condition (Impacts are quantified on an annual basis, unless otherwise noted) Alternatives Resources, Governance Governance Water Wet Water Significant Indicators, and Geographic Areas Committee, Committee, Leasing Meadow Emphasis Scenario 1 Scenario 2 At 13 years, average change in channel width for Central Increase Increase Increase Increase Increase Platte Habitat Area 1 percent 6 percent 7 percent 6 percent 7 percent At 61 years, average change in channel width for Central Increase Increase Increase Increase Decrease Platte Habitat Area 10 3 percent 4 percent 8 percent 4 percent 5 percent Water Quality Central Platte River at Grand Island, Nebraska Daily probability of exceeding Slight Slight Slight 90 °C (average for June, July, improvement at improvement at Improvement at improvement at Improvement at and August) 0.321 0.323 0.317 0.327 0.318 Concentration of copper in Increase of Increase of roughly Increase of Increase of sediments roughly 150 parts 140 parts per million roughly 160 parts roughly 195 parts per million I per million per million Central Platte River Terrestrial Vegetation Communities and Land Use Types Land Cover Type Changes Agriculture -1 percent -0.1 percent Bottomland grasslands 9 percent 10 percent 18 percent 2 percent Woodlands -4 percent -7 percent -11 percent -3 percent Shrublands -7 percent -9 percent -12 percent -2 percent Herbaceous riparian wetlands -5 percent -7 percent -10 percent -3 percent Bare sand 2 percent 1 percent 7 percent Emergent wetlands -1 percent -2 percent No change Sand and gravel mines No change Whooping Crane Channel Habitat Open channel area No change 32 percent 21 percent Roost habitat quality (average for April, October, and 16 percent 34.3 percent 29.6 percent 30 percent November) Out of channel habitat - change in acres 9 percent 11 percent 18 percent 2 percent 'The Central Platte Habitat Area is RM 247 to 160, or Lexington to Chapman, Nebraska. 10Assuming that no channel restoration or sand augmentation occurs after the 13 -year First Increment of the Program.