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6. Temporary hiring of construction personnel to build the con- <br />veyor. <br />~J Different Area Alternative <br />This alternative is to offer for lease 5.6 million tons of federal <br />coal reserves in the D seam on the area lying immediately north of the <br />existing lease C-25079 (see figure 2-1). <br />This area t•ras par*. of the short-term coal tease application sub- <br />mitted by C':Jl in February 1977. The environmental impacts of mining the <br />area mere discussed in the original Environ~;~ntal Assessment Reourt <br />completed in 1977 for that application, In order to analyze the impacts <br />of this alternative a brief, preliminary mine layout eras constructed for <br />the tract. It e;ould be subject to later change and modificaticn as the <br />mining permit application submitted. to OS"i for the tract aras revie~•red. <br />The north mains of the mine ~•;ould be extended alcng their present <br />bearing to the eastern boundary of this tract (see figure II-2). Submains <br />arould be developed rrar the western,:,ost north main tc the northwest; and <br />panels, oriented northeast-southwest r;ould be developed and mined on <br />retreat. <br />This mine layout vrould result in approximately the sa.;.e recovery of <br />reserves as the proposed action. Subsidence rrou7d be ur,7ikely to mach <br />• the surface because the thickness of overburden on the tract exceeds 900 <br />'feet. However, i. subsidence fracturing cccurred under the alluvium in <br />Stevens Gulch,:rater could drain rrcm the alluvium into tl;e mine. I± .s <br />unlif:ely that laree ampunts of vrater vrould be drained into the nine as a <br />result. The effect vrould be te„porary.as the silt and clay particles <br />from the ailuviu.n r:ould seal the crack from the surface, The r2 are n0 <br />- fisheries or aquatic habitat on Stevens Gulch to be affected. <br />As a result of this mine layout the pattern of mining that has been <br />established en the existing property vrould be interrupted. Ito re signi- <br />ficantly, mining mould have occurred or. both sides of the north mains. <br />If the barrier pillars left to protect the north mains are inadequate to <br />carry the r•:eight settling on them, access to the coal reserves lying <br />north r;ould be lost and new portal facilities r•:ould be necessary to <br />reestablish file access and mine the coal on this tract. <br />Other O~ti~ner Alternative <br />This alternative is intended to examine the impacts that r•;ould <br />result if another company (not the applicant--C4JI) were to obtain the <br />tract during the lease sale and mine the area. The alternative appears <br />to be unfeasible because only those companies that have "adjacent <br /> <br />