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1.0 INTRODUCTION • <br />This report presents the results of our slope stability <br />study of the proposed waste dump within Streeter Canyon at <br />your mine in Craig, Colorado. The purpose of our ~.vork was <br />to evaluate the current 4:1 slope design and assess the feas- <br />bility of increasing the slope to 2:1. Our work included site <br />reconnaissance, subsurface explorations, laboratory testing, <br />and engineering analysis and recommendations. The general <br />scope of our work, which included two phases, is outlined in <br />our proposal dated March 2, 1977. Phase I was completed on <br />March 27 with on-site recommendations given to Colowyo Coai <br />( Co. based on the preliminary field evaluation. Phase II in- <br />I eluded the laboratory testing and office analysis and is sum- <br />marized in this report. <br />The proposed construction consists of an open pit coal <br />mine on Federal coal lease D-034365 which consists of about • <br />2,500 acres some 25 miles southwest of Craig. Eight coal <br />seams within a total stratigraphic section of 390 feet are <br />planned to be mined. It is understood that the waste dump <br />L from the initial cut will be placed in Streeter Canyon. Place- <br />ment of the waste dump had begun prior to our involvement and <br />had progressed to approximately the extent shown on Figure 1 <br />l.. while we were at the site. The waste dump will initially <br />be limited to the area west of this initial filling with a pro- <br />jetted filling rate of up to 5 million cubic yards the first <br />year. Subsequently, the larger area east of the initial waste <br />dump will be filled. The proposed limit of the present waste <br />dump concept is shown on Figure 1. <br />' As part of our work, we also reviewed three reports <br />prepared by others concerning. the proposed project. These <br />I. reports were "Report on Preliminary Design of lYaste Dumps" <br />• <br />s <br />