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Greystone Development Consultants, Inc. <br />October 30, 1987 <br />Page 2. <br />Following our onsite meeting, the potential area of disturb- <br />ance was staked and flagged. This area is indicated on the <br />attached sketch. No disturbance is currently proposed outside <br />this area. <br />Material Stockpiles <br />Three material stockpile locations have been identified as <br />temporary storage areas (see sketch). The primary storage area <br />will be on the old substation pad. It is planned that all <br />material excavated from the west side and the caved area will be <br />stored on the pad. The Colorado Department of Highways has also <br />granted permission to utilize two areas of temporary storage <br />along old Highway 133. One area is located just east of the <br />property boundary which the Department also utilizes as a <br />temporary materials storage area. This location will be used to <br />store backfill material for the east side. The other storage <br />area is adjacent to the west property boundary. This area will <br />be utilized only if the substation pad area can not accommodate <br />all material excavated. <br />Structure Repair <br />The existing portal entrance structure is a 22 inch poured <br />concrete frame. Slide material has collapsed the east side of <br />the frame and moved the top slab approximately five feet off of <br />the west side connection. Preliminary examination indicates that <br />the top slab is in tact and may be salvageable. This may also be <br />the case with the east wall. Following excavation, the structur- <br />es will be inspected for their structural intergrade and if <br />possible, repositioned on their original footings and connec- <br />tions. Should the slabs not be salvageable, steel I-beams with a <br />combination of either sheet steel or poured concrete will be <br />utilized for the entrance structure. <br />It has also been estimated that approximately 25 feet of the <br />entry has caved because of the slide. Following excavation of <br />debris, the existing arched I-beams will be replaced. <br />