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SHORT-TEP,t4 COAL LEASE ApPLICATIOPI C-27103 <br />• Air Quality <br />Construction of the vent shaft and access road 4rould increase <br />particulate levels during actual earth moving in a small area around the <br />disturbance. do permanent air quality impacts are predicted. <br />Geologic and Geoeraphic Settir~q <br />Topography <br />As a result of the proposed action, construction and maintenance of <br />the intake ventilation shaft t•;ould disturb a total of l.o acres by 1980. <br />The total acreage disturbed by the ventilation shaft r•:ill be less than <br />one-half of 1 percent of the 300-acre tract.. Approximately 0.3 acre <br />could be disturbed by movir~e a po:rzr/telephone line. <br />Sinking the shaft ~..ould c?nerate an estimated r•:aximum of x,500 <br />CUb1C yards Of t•:aste. Disposal Of i01ne deVelOpl'ent 1~;a5te 15 pUVeYned by <br />the YeoUlatl0nS Cf 30(CrF): 7'_•5.15 !ender the in±erin: manaoem?rat program <br />and 30(CFR): °17.71 uno?r the per~-:anent manaezcent program or the <br />Office of Surface i'ilning. The small volu:rz of o-:aste ccuid probably b? <br />accommodatzd ~,,ithin the existing refuse disposal site cnd result in the <br />disturbance of less than 2 additional acres at the site. <br />• Subsidence features could occur as a result cf the extraction of <br />the E seam on retreat. The sea.;, averages 4 5 feet in thic~:nzss cn the <br />tract and the fetal 'r.eicht of the seam ti•rould probably be ~:,ir•ad. The area <br />of the tract cost vulnerable to the effects of subsidence is in Section <br />12 :;here overb~.,rden is thinnest. Evidence of subsidencz raouid probably <br />not begin appearing in the area until the early 1980s and r;culd probably <br />never affect more than 125 acres (42 percent) of the 300=acre tract. <br />Maximum subsidence ~:ould be about 3 feet. The most likely features <br />~aould be extension cracks, subsidence pits, and co-pression bulges <br />(Dunrud 1970). The 125 acre area subject to subsidence is used primarily <br />• for t•rildlife habitat and lives±ocl; grazing. It is ur.li{;ely that the <br />appearance of these features ;could significantly affect either use of <br />the area. .Jo surface structures have beer. identifizd in the area. <br />As noted by Dunrud and Gsterrrald (1970) subsidence also increases <br />the hazard of underground and surface fires and the release of reLhane <br />gases. Although the occurrence of these hazards is, not likely, they <br />have a potential for causing significant impacts. <br />It should also be noted that the regulations in 30(CrR): 211.31 and <br />30(CFR): 817.121 require that underground mining activities be planned <br />and conducted to control or prevent subsidence and protect and r:aintain <br />• <br />