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' MITIGATION OF IMPAC'T'S Quantity of Water Resources Water historically used on the mining site will partially offset stream flow depletion resulting from future water use. Adams County owns 11.5 shares of the Lower ~„ Clear Creek Ditch Company, one share of the Co or-9o Ag- ~~ ricultural Ditch Company, an shares of tt,e Brantner /J~A'''~.~ Ditch Company. The water yieldeu by the shares from these (~r'a1j0~ three ditch companies have been used in past years to irri- gate 371 acres on a mining site. The total amount of water consumed on the property k~as been 840.08 acre-feet annually (see Appendix A. SVater Rights Evalua rt on). To ensure that an adequate legal suf~ly of water is avrilable to irrigate the grass and schrubs i~, the park water from the two ditches and the effective precipitation from land irrigated by the wells and the dry grasslands Drill be used to balar.::c future water use. The.l~-;=~-acre-f?et ~y27.`CaJ of water that will be consumed under future conditions will be mitigated by 840.08 acre-feet of watt ghat has historically been used on the property (see Appendix B. A~ater Balance). The difference in water uses is nacre-feet annually..rg7.P7 Tliis is the amount of wat~vanorated annually from the lakes• Water from the Brantner an,] the Lower Clear Creek ditches will not be used tQ cover the evaporation of ~uarf+r From 1t;P acres of open .lake surface. Evaporation (Difference between historic and future water use) Lrom the lakes amounts to yy,yz;~~ acre-feet during the months of April through October ~GB18 and-~}9-g--•}f acres-feet for the months of November through March. These depletion rates are eyui.valant to t@--~}, cfs /mss' during April through October and p.,~6 cfs from T!ovember .rough March. The impact of the flow depletion oil the South Platte River is negligible; no mitigation of the evap- oration loss is planned. Ground Plater Level Drawdown There will be no impact from raising or lowering the water table throughout the mining prop~.ty. Irrigation and domestic wells in the vicinity of the property are located at distances great enough so as not to be significantly affect- ed by the lowering or the raising of the water levels. The wet level in the domestic. well ir. the N?V, of the NE; of Section 39 will be r,';ed appro}:imately 3.U feet above the historic levels. The historic water levels in the flood _"in have been approximately 10 feet beneath the land surface. Raising the water level 3.U feet in the well will not affect the performance of the well. The depth to water in the well after reclamation will be ~.0 feet. ?•:ater levels in the -19-