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• 1.0 INTRODUCTION <br />1.1 Description of the Area <br />The proposed Yoast mine is located mainly in secs. 17, and 19, <br />and in smaller parts of secs. 8, 20, 29 and 30, T.SN., R.87W. in <br />Routt County, Colorado. The haul-road alignment originates in the <br />north-central part of sec. 28, and passes southwestward and <br />southward through secs. 29 and 32, T.6N., R.87W. and through secs. <br />5 and 8, T.5N., R.87W. Further references to land sections in this <br />report do not include township and range numbers since there is no <br />duplication of sections in the two townships involved. <br />The subject of this investigation is that part of the <br />future mine operation that requires a haul road and sedimentation <br />pond. The haul-road system is divided into an A (northern) segment <br />• of about 16,100 feet, and a B (southern) segment of about 8400 <br />feet, a combined length of about 24,500 feet, or about 4.6 miles. <br />The origin (Sta. 0+00) of the road is at Routt County Road 27 at an <br />elevation of about 6552 feet and the southern terminus of the road <br />is at Sta. 84+00 where the B alignment passes into the mine area at <br />an elevation of about 7248 feet. The sedimentation pond is located <br />in the north center, NE;, sec. 8. In addition to the haul-road <br />alignments and the sedimentation pond site, eight proposed <br />locations for topsoil storage were studied. Figure 1 shows the <br />haul road alignment, sedimentation pond and the general topography. <br />1.2 Purpose and Scope <br />The purpose of this mapping project was to determine geologic <br />conditions along the haul-road alignments and at the sedimentation <br />pond site that would have a bearing on the design, construction, <br />1 <br />