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• ~UNM;=.?~ • <br />The Revie•N Process, Descr`btion of the Environment <br />anq <br />Description of the CDe~ations anD Reclamation Plan <br />The Re'/l2'n PrGLeSi <br />?Eaccdv Coal Combanv <br />on ?lovember 13, 1940 <br />1490, and the prope~ <br />consecutive week; in <br />e~ition. <br />iP?aootly) submitted a permit revision application (PR #1) <br />The 30p 1t3tiGn was ~?timed CGmp'•?t? on Vcv?tuber 23, <br />notification r~aS s?^t `o carne; identifieq in Ruie <br />iDe' nGtiC? Gf the 30p~~`Cat'. Cn `ddS rUn fCr fGUr <br />the ~`eaT~bcat r;~ot, beginning witn the Ncvemeer 29, 1450 <br />The Division issued a preliminary atleGuac% 12tter on Narch 11, 1991. <br />Peabody's responses to the adequacy letter were received by the Division on <br />gpril 29, 1991. Issues raised during the review had not been fully resolved <br />prior to the end of the 180 day review period iMay 29, 1991). As a result, <br />PeaDGdy Coal Company waiv?d their rignt to the 180 day review time period by <br />iettEr Of M3/ 26, 1991. .~ Se GCnO dd2gUaCj letter `day 1s;Ued by the DiV151Gn <br />Gn June 3, 1991 and Peaocd;/~< subs?~uen~ r?SDGr,?s have allowed the Division <br />t0 liiUe thls DroC0S2•d deClSiGn. <br />DescriDticn of the Environment <br />he pfGCvScd GpErdt'Gn 7> iGGated in nOrth'.veSt (.GlGfatlO appro,cimately 7 miles <br />south of Hayden in Rcutt County. Tne Seneca iI-w Nine lies i miles due west <br />cf the Seneca II .Nine, File No. C-80-005. <br />cle`/ati0n Of the general mine Sit? va`~?S f'cm 3DprOximdC?ly 6a00 to <br />ds50 feet. Slop?<_ range from a genii? 7?: -o vertical ledges formed by the <br />Twenty Mile and Trout i.fe?( sandstones. Nany of the drainages are deeGly <br />incised. <br />Structurally, the mining ar?a lies w9 thin the regionally sianificant Sand Wash <br />Structural Basin. Of local significant? is the Sage Creek P.nticline. The <br />mine site lies on the western limb of this anticline. Rock units dip 8 to 14 <br />degrees to the west. Faulting has been Gbs?rued in the region, Howe/er no <br />faults have been identified at the mine sit?. <br />The surficial geoicg% of the ar=_a is wmc~sed chiefly of sedimentary rocks. of <br />ma`ine dnd nor.-mdr'ne Ofigln. TheSE 52dim?nti:"d roc:<5 ~.ve."E forr.:E7 thf;rUgn t.'lE <br />t'anSy'r?iii on and r?yr?SSiOn pf 3n ep'c~ntrnent3l iE a. <br />Rcc!c GutcrOppingS `di tnln the permlt bCUndary li pf2dCmindt?~'/ Of the <br />Jbper Cretaceous Nesav?~d2 Group. The Nesav?ode GrGUO is divided into two <br />~cnmations, the I':es Formation and the 'rli'.i3ms ForK Formation. Both <br />F':f mdCiCnS 3f2 CCmDr~52d 7f S2gUenC°_i Of Sandstones, S11titG~ei, Shales dnd <br />Wal. The o':der :`~~ F~rmatiGn GUtCrG05 .~ LnE ?3St?rnmG:t pCrttOn Of the <br />permit boungary wnil? LhrGUghCUt the rest %f th? D2'm1t dr??, th? sUrfiClal <br />rock i5 from the Williams Fork Formation. Thor? are some thin surficial <br />deposits of Quaternary alluvium and col'uvium scattered throughout the area. <br />- 3 - <br />