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• All documented springs issue from unconsolidated <br />Quaternary deposits of colluvial and alluvial soils. Their <br />discharge, as estimated during the summer period of 1982, <br />varied between small, non-measurable quantities to about 0 <br />gpm. CWI mentions several instances of leakage from the old <br />Pitkin Mesa aqueduct. <br />All identified springs are shown on Plate 9. <br />3.4 BUILDINGS AtJD STRUCTURES <br />An inventory of structures was performed to enable the <br />evaluation of the impact of subsidence, if any, for each <br />structure within or immediately adjacent to the proposed <br />long-term lease area boundary. These structures are <br />described below; their locations are indicated on Plate 9, <br />Land 'Jse, Surface Water, Buildings and Structures. No <br />structures from the Orchard Valley Mine surface facilities <br />have been included in the inventory since all these <br />structures lie below the coal outcrop. <br />Nineteen buildings have been identified and plotted on <br />Plate 9. These are generally small cabins or sheds which <br />would not be particularly sensitive to the effects of <br />• subsidence. However, exceptions are the Muckle house, which <br />is a restaurant and substantial structure located at Stevens <br />Gulch, in the N[d quarter of Section 13, and the Morrell's <br />ranch which is adjacent to the Muckle House. <br />Power Lines <br />A 230 kV electric power transmission line parallels <br />Terror Creek on its west side. This is the Curecanti-Hayden <br />Power Line, ~ohich is operated by the Department of Energy. <br />A 7,200 volt underground power line is buried F feet <br />deep along the CWI pipeline alignment from the Stevens Gulch <br />pump house and well field to the mine site. <br />Pipelines <br />A C6VI water supply pipeline carries water from the CWI <br />well field in Stevens Gulch to the mine site. This consists <br />of a 4-inch diameter ductile steel pipe with flange <br />connections. It is buried 30 inches deep. <br />• <br />- 18 - <br />