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<br />because the Sout,4 1'1oCte i~ r,vr_r aJ,pny,ri.itcri, Ih,• use of l,~t w•., L,•r ror r?u.:t <br />f suppression would h.wc to br r2•placr`~i !~v .7uq:i,•nr.rriun w.:rcr. .1f1 w.rL,•r ':Lal'crl <br />in the pit or stored in cl:nJ-lined, n!•r;dcwaterr:d pond:, Mould also have ,o be <br />replaced by augmentation. Dccarrse of these ce:;cerr:; t.rrc following stiprrlatior, <br />is necessary: <br />GJITHIN 60 DAYS OF PERA:IT ISSUA}:CE THE APPLICAI:T S1.'T,iL SUBP:IT TD F'LRD A;:D <br />THE COLORADO ETATL ENGZIJELF.S OFFICE A MORE DETAILED BP.ERY.DOh'R OF TNL PRO- <br />POSED USES OF TRIBUTARI' WATER ASSOCIATED WITH THL f.`INE OPERATION AI.'D A <br />DETAILED D£SCRIPTIOIJ OF A MITIGATI01: PLA}J FOR DEPLETIOI' TO TRIBUTARY F/RTER <br />THAT IS ACCEPTABLE TO TIlE STATE E1:GIiJEERS OFFICE. MITIGRTIOP7 AfAY IIJCLUDE AN <br />AUGMENTATION PLAN OR 14E1fBERSIfIP I;: A!J J. L'G1iE1: TATION PLAlJ APPROVED BY Tf!E <br />STATE ENGINEERS OFFICE. <br />IX. Assessment of Probable 'Cumulative Imnact <br />The purpose of this discussion is to provide an assessment of the cumulative <br />impacts 'of the proposed mine and any adjaccr.t mines on the hydrologic balance <br />of the region. In this case there are no other mines located near the rYCCnesburg <br />mine that could synergisticly imliact the hydrologic balance above w}rat is <br />predicted for the individual mine site. To the best of our knor.'lc•dye, the only <br />additional mining expected to take place irr the area will be continual mining <br />by Coors Energy Coml,any of coal adjacent to the five yc.-rr permit area. From <br />information supplied by Coors, it is an ticipatcd that an additional area of 920 <br />acres will be mined adjacent to the 421 acre permit area. 7'h.is mining will <br />take place over the next 20 years within the area designated "Final Mining <br />Operations boundary" on the Giine Plan m.~p in Ar,pendir. ;~;-2. Mining in pits R <br />and B will continue to progress south into Section 36 and an additional pit <br />(Pit C) will be opened adjacent to Pit B. <br />The effects of mining adr?itional coal adjacent to the five year pernit area will <br />be to magnify the impacts predicted for the 5-uear mine flan. Mining the adjacent <br />land will not affect any additional aquifers cr surface water bodies. lJOwever, <br />the effects of mininy'on the drawdown of piezometric surface of the Laramie <br />can be expected to increase. A model presented in Appendix I-1 pa ye 43 predicts <br />that drawdown will incrca.se tc 2,090 feet (0.4 milcsl adiaccrrt from the pit <br />compared to tiro current prcrlic•tion of 1050 feet fur tlrr` five ycr+r mine plan. <br />Impacts from this sl.iyht increase in drawdor.ar will br. minima) since Chore arc <br />no users of this water in the vicinity of the mine. Since mining M•i21 tend to <br />move west away frortr Enrris Draw and sirrcc the tra ns mi.ssi vi ti cs of the f.a ra n, .ic <br />make the drawdown curves vc•rrJ steep n[ the :rctiLr: 1riC, dr.'rwr)nw•n near Ennis <br />Draw c,'iI1 be srtu11 during later ucars of minin!r. <br />Chances in around water quality in the Laramie should not Lary significantly <br />as t}re result of additional mining. Tare overburden cfremistry does not chance <br />very much in areas adjacent to the five uear mine plan. If the applicant is <br />correct in ,5is prediction o.` li the change ir. Ground i,~ater quali w moving <br />throuch spoils, then Ennis Dram mill rot be arcatly affected. Ifowever, if water <br />is greatly decraded as it moves throuch the spoils, trrc effects on Ennis Draw <br />