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1.D INTRODUCTION <br />• 1.1 Description of the Area <br />The current operations of the Seneca II-W mine are located mainly in secs. <br />15, 21, 22, and 23, T.5N., R.88W. in Routt County, Colorado. The subject of <br />this investigation is that part of the future mine operation that requires a <br />haul road and sedimentation pond in 005 Gulch in the NE 1/4, sec. 15. The <br />upper part of the gulch extends from the north-central part of sec. 15 where <br />elevations are about 7300 feet, northwestward to Dry Creek where the confluence <br />of it and 005 Gulch is at an elevation of about 6680 feet in the SW 1/4, NE <br />1/4, sec. 9. <br />1.2 Purpose and Scope <br />The work described in this report was undertaken to determine the extent <br />of existing landslides, and unstable and potentially unstable ground in 005 <br />Gulch with particular reference to proposed Haul Road G, and to Sedimentation <br />Pond 005. The main purpose of this investigation was to define areas of <br />instability, to make appropriate recommendations for drill-hole testing, and to <br />provide geologic inputs to Peabody Coal Company for its design efforts. <br />The scope of the work included office geologic evaluation of aerial <br />photography (photogeology), field confirmation of photogeologic mapping, <br />additional mapping in the field, and conferring with personnel of Peabody Coal <br />Company, and with its soils engineering subcontractor, Ground Engineering <br />Consultants, Inc. <br />In addition to the detailed geologic work in 005 Gulch, the regional <br />geology particularly to the north, west, and south of the gulch was reviewed. <br />The regional area mapped included parts of secs. 9, 10, 15, and 16, T.5N., <br />R.88W. Detailed geology of 005 Gulch was mapped in the east-central part of <br />• sec. 9, SW 1/4, sec. 10, and NW I/4, sec. 15. <br />1 <br />