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• Approximate overburden thicknesses at the four <br />buildings where future subsidence is predicted are 790 feet <br />at the Muckle House and Morrell's ranch, 880 feet at the <br />Gross-Rhode cabin, and 1,680 feet at the unnamed cabin near <br />Morrell Cow Camp. This indicates that the Muckle House, <br />htorrell's ranch and the Gross-Rhode cabin may be subject to <br />appreciable damage under the currently proposed mining plan. <br />The thicker overburden beneath the unnamed cabin should <br />result in relatively less strains so that only slight to <br />negligible damage is to be expected. <br />All other buildings within the lease area lie <br />outside predicted subsidence zones. <br />Power Lines <br />The power line along Terror Creek lies outside the <br />predicted subsidence zone and should not be affected by <br />subsidence. <br />The southern end of the 7,200 volt C4lI power line from <br />the mine site to the wellfield overlies 1st East through 3rd <br />East panels off 1st Nortti 14ains. Mining has been completed <br />in these panels. Some subsidence should have occurred <br />• already in this area, and no additional subsidence is <br />predicted. Future subsidence is predicted near the north end <br />of the powerline. A flexible power cable should be capable <br />of withstanding moderate effects of subsidence without <br />significant damage. However, the character of the cable and <br />any enclosing conduit should be checked to confirm this. <br />Pipelines <br />The water pipeline from the C'NI well field in Stevens <br />Gulch to the mine should undergo no additional subsidence at <br />its southern end, where mining has been completed, but its <br />northern end lies within a subsidence zone. The ability of <br />the pipeline to withstand subsidence and bending should be <br />verified. <br />The Pitkin Mesa Pipeline crosses four separate <br />extraction zones within Steven Gulch where substantial <br />subsidence is predicted, according to the currently proposed <br />mine plan. To the north of the Stevens Gulch alluvium it <br />lies outside areas of predicted subsidence. T!re ability of <br />the pipeline to withstand substantial strains over the <br />entire Lena*_h o` Stevens Gulch above the D-seam should be <br />verified. <br />• <br />_ 54 _ <br />