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IMPACTS R~JLT-i:+v FROM MINIt]G AND REC•.•WTION Quantity of Water Resources Gravel will be mined from the property by a wet method. In phis 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 for recreation pur- posed and Trill be incorporated in' the adjoining fairgrounds and recreation complex. La use undo future conditions will include irrigated grass, non-irrigated dry grasslands 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 Road will not be irrigated and natural conditions will prevail. Approximately 233.3 acres in the mit. ng site south of the ;:endersoii Road will consist of lawns and landscaped areas that will be irrigated. The remaining 133.7 acres in the mining s' ~ will be non-irri- gated and natural condiL .,is will prevail (Figure 5). Water to irrigate the 233.3 acres will be derived by pumping directly from the lake or from a series of wells drilled into the alluvial deposits. The use of water for. the irrigation of lawns and landscaping in the park will consume 746.56 acre-feet annually. The dry land area will ~ 909 consume a}3-gg-acre-feet annually which :ill be derived from pre- cipitation. Evaporation of water form the open lake surfaces ~/2,3pwill consume ~-82~$ acre-feet annually. The future con- sumptive use of water in the park will amount to~^~ ~~ a? 9S acr~•-feet annually and will d~F:lete s~ieam flews in the South Platte River by an equivalent amount. Because c,f the relative proximity of the lakes and the wells to the Sou~h Pl..tte River, stream depletion will occur approximately the same time as water is consumed and evaporated. Irrigation water will be consumed entirely during the growing season. Evaporation, however, occurs year around; 72.5 of the water is evaporated c?~irinc7 the growing season (304.24 acre-feet), and the rer.~aining 27.58 `ry~~~of the water is ev~+norated during the winter m~.~tiis -"T '?A=?-6 /68 acre-feet). Water Quality The aggregate will be mined by a wet operation. r~l processing water will be circulated l.. a clocec: system. There will be no discharge of waste water to the South Platte P.iver, consequently, there will be no impact o:1 water quality of the river. Ground ".ter Level Drawdown By using a wet operation the im~,act of the mining and -9-