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June 24, 1985 5 853-'2038 <br />shed landslide. Only limited success had been achieved in trying <br />to excavate the toe of the landslide ,:hich was pushing against <br />the rear wall oP the switching shed, since the saturated material <br />in the toe area of the slide could not be easily excavated. <br />The diversion of surface water is the simplest measure which ca^ <br />be taken to eliminate or reduce landslide deformations. For this <br />reason, the surface-water drainage system should be repaired and <br />maintained in good operating condition. To be effective, this <br />should be completed while ground-water levels are low. While the <br />surface-water diversion system was apparently successful in <br />stabilizing the landslides around the surface facilities at one <br />time, it may be less successful now that large landslide defor- <br />mations have occurred. <br />During our site inspection, we concurred with the mine person- <br />nel's proposal to excavate toe material from the switching shed <br />landslide using a backhoe. This was considered to be appropriate <br />in view of the severe damage already sustained by the shed and <br />the potential for damage to the switching equipment if additional <br />deformations occurred. It was considered that this excavation <br />could provide temporary relief to the switching shed now that the <br />landslide has dried somewhat. however, excavatio^ in the toe of <br />an active landslide will rarely provide a long term solution to <br />landslide problems and frequently simply increases landslide <br />deformation rates. In addition, in this case, there is a risk <br />that excavation may cause deformations to develop throughout a <br />larger area of the main central landslide. For these reasons, <br />the toe excavatio^ can only be considered a temporary relief <br />measure and its effect on the remainder of the central slide <br />should be monitored closely. <br />Golder Associates <br />