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<br />Hcweve~, water in ccntact with coal; :nay be calcium sulfate in character and <br />may contain fluoride, iron, manganese, selenium and sulfate in excess of <br />U.S. Public H2aitn Ser+ice drinking Nat=~ standards (Brogden and Giles, <br />i977). TDS ccnr?ntration of wat?r Nithin the Iles and Williams Fork <br />Formation; ranges from 334 to 1,460 mgil (Brcggen and Gi125, 1977), with the <br />wa*?r contained in the coal; and thin discGntinuous sangstones generally being <br />of pcorer quality tnan teat from the !tlds;ive r?gional sandstone aquifers. <br />62caus? of the gcor quality and limited yieid cf wat?r-~earing units <br />a;scciated with the coal;, use of chi; water is not significant. <br />AC the 52!1eC3 II-W Mine, the WOIf Cr2?k Cpd'. 523m, WGl' free(/Wddge <br />In terbUrd?n. Wddg2 COdi 523m 3nq t~"e Wiliiams Fc r'< ov?-burden 'Here examined d5 <br />OOt?nLldi wdt?r b?firing ,L.dtd. Th? •Wiiliarii; ~JtK Gv2ruUrgen is a term Used <br />by Pedpotly Coal Company to de trine tie discontinuous, lenticular sandstones <br />overlying the Wadg= coai ;tam. ice Jivisicn uses the term Waage overburden to <br />describe these same units througncut this tlocument. <br />LimiCed ground water yields have been cbta~ned from the Lewis Shale but us? of <br />water from this unit is consider2tl insignificant in the Twentymile Park <br />Basin. Where the Lewis Shale is present in the area, it acts as an <br />impermeable Confining layer cr?dtir,g artesian conditions within the underlying <br />aquifer, of the Mesaverde Grouq. <br />The high?st r?ported `Ne'! '/i21.ds cf grand 'Nat?r aquifer; in the basin Cdn be <br />ob*.ained from the uncon;oiidat?tl diluviai deposits cf the Tampa River and its <br />tributaries. Well yieid; range from 5 ga'lmin to as much as 900 gal/min <br />(Brogden and Gile<_, 1977). The principal use of water from the ailuvial <br />aqu~f?r; is for domestic and ;tOCk '.J3t?ring purposes, however, permeab?lilies <br />are sufficient in sane ar?as to ;Jpport long term, high yield wells for <br />municipal and incustrial nee•is and irrigation, particularly in the Tampa River <br />alluvium. Water quality is variabl?, d?gerding on the underlying rock and <br />Sour,;? pf allu'/id! mdteri3'. TuS conc?ntraticr, rana2s from 32 tc 2,970 mq/1 <br />and the wat?r md'/ CGnt3 '.n CQnC?ntf3tipn5 Of arsenic. Iron, mdnCdneS2, nltrdt?, <br />521eni'Jm, and Sulfate in exC?;; of U.S. Public Health S2r~/ice Drinking Water <br />Standards (Brogden and Giles, 1917). <br />Ground water flow in the Upper Yampa River Basin is controll?tl by the geologic <br />;tructur?, stratigrdphy and geomorphology of the general area. The flows of <br />ground cater in the rock aquif?r; are controlled by the structural folding and <br />faulting and stratigrdpny whit? the flows of ground wat?r in the alluvial <br />dgUlf2r; dr2 CCntrOil?~ ;,% tn? g2^_nCrphO!CCy Of tn2 ;Lr23m valley;. <br />,~5 'n 3; ?arller stated, It '.; belie'/°_~ that the ground da`,?r :.000rr?nC2 in the <br />.j 2'`.e'ai it?a 15 ;tr'JC rU r3li!/ ;2par3t?d rr;m Otfl2 !' mine of?3; In the region. <br />Th? r;C< ;trdt3 '.n the S?^eCa IL-+I Mln2 3`e3 d''? r?C,'13r~ed dL the 3f?a; Of <br />CUt•tr;,0 NhIC:~ Cdr3,lei :ne Sd~j2 ',f??K ~nt1C!inai dxls, ; m1nCr' StrUCtUr31 <br />f?afar? within the larger Sand Wasn 3d;in. "h2 rock strata dip st?eply, with <br />the dip air?Ction being ;lightly scut;'1 cf west. Ground •.vat2r ma/?.ment foilc'Ns <br />this dip. <br />-27- <br />