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June 24, 1985 4 853-2038 <br />would expect deformations of this landslide to continue during <br />periods of high ground-water levels unless stabilizing procedures <br />are implemented. These deformations comprise a potential hazard <br />principally for the switching shed. A storage yard, which is <br />surrounded by a chain link fence immediately southwest of the <br />switching shed, appears to be beyond the current area of slide <br />activity and would probably be damaged only if the existing <br />landslide limits are extended. <br />The large landslide which has already damaged the conveyor portal <br />can be expected to undergo continued deformations during periods <br />of high ground water; landslide movements will be aggravated by <br />any continued excavations in the area that are required to main- <br />tain the State Highway. The serious damage already sustained by <br />the conveyor portal can be expected to worsen, which will sub- <br />stantially increase the difficulty of any portal rehabilitation <br />work.. 19hile this landslide does not appear to currently extend <br />as far as the conveyor supports, it is possible that continued <br />development of the slide could eventually result in its encroach- <br />ing on the conveyor supports. <br />The small landslide immediately above the substation does not <br />appear to constitute a serious hazard at this time. Deformations <br />are small and have probably developed at a slow rate. There is <br />no electrical equipment within approximately 20 feet of the <br />northern chain link fence of the substation. Large deformation <br />would have to occur rapidly to endanger electrical equipment in <br />the near future. <br />POSSIBLE b1ITIGATION b1EASURES <br />Prior to our site visit, mine personnel had diverted surface <br />water runoff to prevent it from entering the top of the switching <br />Golder Associates <br />