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Slope Evaluation and Remediation <br />West Elk Mine <br />Somerset, Colorado <br />place during earthwork construction. The remaining potential settlements likely will take <br />several months or longer, to be realized. <br />Surface Drainage and Re- Vegetation The finished surface of the buttress fill should <br />be designed to drain effectively. <br />A drainage Swale ( "brow ditch ") should be constructed around the upslope margin of the <br />buttress to direct surface waters downslope around the fill. <br />The finished surface will be subject to erosional raveling and local sloughing, particularly <br />until vegetation is well re- established. Therefore, the buttress fill and adjacent areas <br />should be re- vegetated as quickly as possible to limit erosion and reduce soil moisture. <br />The finished surface of the buttress should be maintained following construction to repair <br />areas of settlement and erosion until vegetation is well re- established. Multiple re- <br />vegetation events are commonly required to establish growth on 2:1 (horizontal <br />vertical) slope angles. <br />Post - Remediation Monitoring GROUND recommends that after remedial construction <br />has been completed, approximately 6 survey monitoring points be established within the <br />area of the buttress fill, as well as an appropriate reference point outside the subject <br />area. These survey monitoring points then can be used to evaluate the extent of post- <br />construction settlement as well as to quantify any future slope movements. <br />CLOSURE <br />Geotechnical Review The author of this report should be retained to review project <br />plans and specifications to evaluate whether they comply with the intent of the <br />recommendations in this report. The review should be requested in writing. <br />The geotechnical recommendations presented in this report are contingent upon <br />observation and testing of project earthworks by representatives of GROUND. If another <br />geotechnical consultant is selected to provide materials testing, then that consultant <br />must assume all responsibility for the geotechnical aspects of the project by concurring <br />in writing with the recommendations in this report, or by providing alternative <br />recommendations. <br />Job No. 11 -6014 GROUND Engineering Consultants, Inc. Page 12 <br />