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<br />(nee ?!ap ~yll-C cf the nermi*_ anplicaticn). ^ha ccmlined r1]ic.kn=ss~s of ttes~ <br />sandstones is abo'xt 45U feet. Th= straticranh::c l:ositions cf the inr'iv_dtral <br />sandstones are, 'n ascending order, .he ?rd, 2n•', and Sst. separating each or <br />the sardsr_one snits is ~ thin series of shales and thi,~ coals. Cn_'u the Zower <br />:bite sardstnre, .ne 3rd, is proposed to be disturbed by ;wining. when r..:ning <br />is completes, the 3rd GPhite sandstone c;i1l be in direct h~drolocic contact '~1.^.n <br />reolair.,ed spoils. The ist and ?rd [rhite sandstones are separated trop .Tin:.-,c <br />by suificienr strar_igraphic thic;:ness ant surface des tance such tact the po`en- <br />tiai for impacts is minimal. Tterefore, only file 'rd !:'bite sanc:stene is d-s- <br />cussed in detail in this document. <br />T.he 3rd :white sa::dstorne attJirs a thici:ness of ~;;o,:t 1`0 _`eet in the v_'c,•'nity <br />of the Trapper Mine. It is stratigraphically s'tuated about 20-50 feat above <br />tae F' coal seam. A series of about 50 feet cf shales and coals separate it <br />frJ:r t!+~ above-19ino 2nd t:'hite sandstone. T.".is shales lay=r creates a suf- <br />ficient impermeable barrier to al_'ow for :refs completer', ir. `_i:e aquifer to <br />c:rhibit ro-;fined ciraracteristi.cs. The applicant has ohtair.°d trsrsrcissivity <br />and storage coeff_'cient values for the aguifar. ?ta _,-.iorr.~at_cn is nae=eri <br />in case a poiutant-migration model would ha,e to De developsd. <br />The avatar aua'ity of the 3rd white sendste.^.e can Se asneraily categorised as <br />poor for domestic purposes and good for irrigation and livestock-watarir.c <br />• purposes. Total dissoly.=d solids values range from t•.i2 .0 9 5.? mg,~l. The <br />range _~ pY. is from o.6 to !0. E5. The rzte_ calci.c~,. bicarbonate tyee. <br />Sc..fa te, iron, and T~3 copse.^.tra bons ronsist=n=ly excer~d dri n:;i rg w,; ter <br />standards. <br />The aquifer gene~..Ily recharges at its outcrop and dis::hames at its subcrop <br />into the Yampa River alluvial aquifer. The norr~ern limits c_° mining at .he <br />Trapper Mine wi L remove portiors cf the 3rd White sanc's=one. The aquifer <br />:;ia be in direct hydrologic communication with re.laimed spoils. .Projected <br />impacts to the aquifer are discussed Later ir. th-; d-.cement. <br />The `_wo major alluvial aquifers in the v_'cirity o_° he Trapoe.r Mina a.-a those <br />associated with the Yampa and [•Ci;.lia:rs Pork R_vers. Ail outface drainage from <br />the Tra nper Mine i-Iows aeay from the :ri li-ams lock River and towards fire :'amna <br />3i vet. _TBerefore, no mining-related impacts ar_ pro iect•zd fa.r r. ire 'illiams <br />For}: Raver or alluvial a.;cifer. <br />T;:e nosh edge of t!re propose-' ,ni ni ng a 'goes,-ed about 2 to 3 miles from t;;e <br />Tampa River. The applicant has determined that surface drairage from the Trapper <br />/tir;e c,:ntrihutes only C.J7 cfs/mi` to the Fa;rpa River flow. The applicant fount <br />flint rcurd water con`..-ibc ti on to t!,e base _°IJ:.r ~f c^c~ Yav(Ca k~"Cr ;n c.~e E:O <br />3ottom area is und~uactable (p. 2--53_ of the re~crrit application). TY.e_efora, <br />':he Trapper Mine is not e;:pectad to prc~ucs gnu impacts on the Yampa or Fiilliams <br />For!: P.icers or associated alluvial gnu"fors. <br />Ground wale. use is d~sc~7ssed o, r. 2-5?~ cf less pex'.mit appl:cation. Ge.^.e^aI-_r, <br />• '-sere are abou` 5^, rsoister=.Y ^riaats :Dulls i : t.'~e-v:c_nity t~f the ?'tappet :-tin^. <br />^~~~ locations of these :rolls are sho~~~r. an ~~!ap ;131. <br />