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and maintenance of these features. The major part of this <br /> • <br />investigation was to provide geologic inputs to Peabody Western <br />Coal Company (PWCC) for its design efforts. Areas were t~ be <br />identified where problems exist, or where they might occur :s a <br />result of construction. Appropriate recommendations for drill Hole <br />testing were also to be made. Amuedo and Ivey, Inc. is referred to <br />as "AI" hereafter in this report. <br />The scope of the work included office geologic evaluation of <br />aerial photography (photogeology), field confirmation of <br />photogeologic mapping, additional mapping in the field, and <br />conferring with personnel of PWCC, and with its soils engineering <br />subcontractor, Northwest Colorado Consultants, Inc. (NCC). The <br />scope of the mapping extended southward from the origin of Haul <br />Road A to the terminus of Haul Road B. <br /> <br />The paucity of outcrops along the alignment made it necessary <br />to map, by photogeologic methods, a relatively large area in order <br />to extend geologic control by projection into critical parts of the <br />alignment where rock outcrops were sparse. <br />The northern (A) haul-road alignment passes through an area <br />underlain primarily by shale with some interbedded sandstones. <br />This rock assemblage weathers to smooth slopes, and outcrops are <br />rare except where a few drainages have exposed bedrock. In the <br />southern (B) part of the area, predominant and more resistant <br />sandstone forms a more varied and slightly more complex geology <br />which, in most places along the alignment, is obscured by dense <br />vegetation growth that covers rock outcrops. <br />• <br />2 <br />