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MITIGATIO[J OF IMPACTS 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 4r Clear Creek Ditch Company, one share of the o orado A - ~~ Ficultural Ditch Company an s ayes of the Brantner /~A''~.~ Ditch Company. The a *_er yie]~~ed by the shares from these ('~o~ 1 three ditch companies have bean used in past years to irri- gate 371 acres on a mining mite. The total amount of water consumed on the property has been 840.08 amore-feet annually (see Appendix A. Water Rights Evaluation). e To ensure that an adequate legal sup?ly of water is available to irrigate. the grass and schrubs in the park water from the two ditches and the effective precipitation from land irrigated by the wells ar.d the dry grasslands will be used to balan~;~ future water use. The.~.;-~-.acre-feet ~y27,'i'3J of water that will be consumed under future conditions will be mitigated by 840.08 acre-feet of water that iias historically been used on the property (see Appendix B. Water Balance). The difference in water uses is =nacre-feet annually. r~7vy Water from the Brantner .;nd the Lower Clear Crc;ek ditches 6wi11 not be used tc~,cover thi, evaporation. of warmer fromy~ acres of open lake surface. Evaporation (Difference between historic and future water use) rrom the lakes amounts to 4y3y1'~= ~ acre-feet during the months of April through October [G8.3B and-~}g$--1~ acres-feet for the months of November through March. These depletion rates are eyui.valant to ~,~5 cfs /~ y during April tF~rough October and 0.,~( cfs from P'.ovember through March. The impact cf the flo~•~ depletion on the South Platte River is negligible; no mitigation of the evap- oration loss is planned. Ground V]ater Level Drawdown There will be no impact from raising or lowering the water table throughout the mining pro pert;. 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 rising of the water levels. The water level in the domestic well ir, the NW, of the NE; of Section 34 will be raised approximately 3.U feet above the historic levels. The historic water levels in the flood plain have been approximately 10 feet ueneath the land surface. Raising the w .er level 3.0 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. Eater levels in the -14-