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Because e>:tansion of mining operations onto fed?ral coal would nut require any er•pansion of existing facilities on the floodplain of the Pdorth Forl: P,iver, there is no flood hazard as the result of the proposed • action. No impacts to alluvial valleys or rloodplains would occur. Soils • Soil impacts from the proposed action v,ould be minimal. Construc- tion and op?ration of mine surface facilities and surface subsidence are the major sours?s of soil impacts. • The construction and operation of a ventilation shaft vrould affect approximately 1.6 acres, including the access road to the shaft. Approximately 0.3 acre v:ould be disturbed by moving the por:?r/tel?phone line. Topsoil should be removed from the disturbed area around th? ventilation shaft and stockpiled in compliance with 30(CFR): 7i7.2C or 30(CFP,): 817,101-817.165 to minimize soil erosion. R?g+-ading, redistribu- tion of the topsoil, and reveg?tation of the disturbed areas should be aCCOmpllSh?G durln^y the f1rSt normal period cf faVOrabie punting condi- tions follor:ing nine abandon:-?nL according to the r?thods prescrib?d in 30(CFr): 717.17 or 30(CFn): 817.24-di7.25; 30(CFR): 817.111-8i7.1i7, and 30(CFr): 817.166. P,emoval of Coal sears could cause an estimated ~,~ax.ir.ur,~ surface subsidence of 3 feet. Soil disturbance +vould be minor ar"ere no cuts were exposed. Ho~;:ever, localized slu^ps could e;:pose cuts of bare soil causing rill and ouily erosion. The size and slope of i!~e bare seas v:ould doteri.,lne the rat? of erosion. related to tit? SUbs'ti:_r~Ce haza+-d is the possibility of m?thane gases leaking to the surface througi: fractures in the overburden and killing surrounding v?cetaticn. ~r~is would decrease the giant cover and could accelerate soil erosion in these locations. ~~onitorina for potential subsidence should be conducted according to 30(CFR): 317.125. The net effect of erosional would be a deterioration in soil biotic activity, and reduction in tation more difficult. losses of soil and soil compaction structure, loss of organic ratter and productivity. This +,ould make revege- Vegetation Construction of a ventilation shaft by 1980 +•:ou1G be the only vegetative-disturbir.e impact resulting from the proposed action. Approximately 1.6 acres +•,ould be disturbed by the silaT^t and the access road leading to it by 1980. Approximately 0.3 acre could be disturbed by moving the poa:er/telephone line. The impacts of the vegetative disturbance +•,ould be an increase in soil erosion, a decrease in visual aspects of the landscape, and a minimal loss of livestock and +~ildlife •