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IMPACTS I~LT1:yG FROM MINING AND REt~i~ ~TION Quantity of Water Resources Gravel will be mined from the property by a wet method. In this process, aggregate is dredged or pulled from the lake bottom and sides; there is no need for a dewatering trench encompassing the mining operation. The land will be reclaimed by Adams County I.,r recreation pur- posed and will be incorporated into the adjoining fairgrounds and recreation complex. Land use under future conditions will includ~ irrigated grass, non-irrigated dry grass] ids and lakes (See Appendix B. Water balance). Approximately 160 acres of the total 527 acres will be converted to open water surface in two lakes. Land north of the Henderson Roars will not be irrigated and natural conditions will prevail. Approximately 233 3 acres in the mining site south of the ::endersori Road will consist of lawns and landsr_aped areas that will be irrigated. The remaining 133.7 acres in the mining site will be non-irri- gated and natural conditions will prevail (Figu_e 5). Water to irrigate the 233.3 acres will be deri 3 by pumping directly from the lake or Lrom a series of wells drilled into the alluvial deposits. The use of w '.~r for the irrigation of lawns and landscaping in the park will con.ame 746.56 acre-feet annually. The dry land area will ~ goy consume a}3~9- acre-feet annually which o:ill be derived from pre- cipitation. Evaporation of water form the open lake surfaces 6/~,3p will consume ~-02:4& acre-feet annually. The future con- sumptive use of water in the park will amount to ~~~~ ~~ ~? 9S acre-feet annually and will d~la ete stream flows in the South Platte River by an equivalent amount. Rrr•a~,se ~,f the relative proximity of tha lakes and the wells ~.. ..ne Sou~h Platte River, stream depletion will occur approximately the same time as water is consumed and evaporated. Irrigation water will he cuns,imed entirely during the growing season. P:vaporation, however, occurs year around; 72.Sb of the water is evaporated r?,iring the y~~wing season (3x4:2-4 acre-feet), and the rer.,ainin7 27.58 `~y~~~of the water is evaporated during the winter mo.,th~ -Ei~B._lb /6~ acre-fec`~. J~ Water Quality The aggregate will be mined by a wet operation. All _,~cessinq water will be circulated ir, a closet: system. There will be no discharge of waste water to 'the South Platte River, consequently, there will be no impact o~i water quality of the river. Ground Pater Levul Dr:,a~down By using a cvet operation the impact of the mining and -9-