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4.03 ROnDB <br />4.03.1 Raul Roads. (Cont'd.) <br />The steepest portion of the Orchard Valley West Mine haul road is designed <br />to have a grade of approximately 10 percent. <br />The overall grade of the Orchard Valley R-0-M coal stockpile haul road is <br />less than l0 percent. <br />(3) (a) (ii) <br />No haul roads have a maximum pitch grade in excess of 15 percent. <br />(3) (a) (iii) <br />No haul roads have more than 300 feet of pitch grade exceeding l0 percent <br />within any consecutive 1000 feet. No haul roads have any pitch grade <br />steeper than 15%. <br />(3) (b) <br />The Orchard Valley Mine haul road has a horizontal alignment consistent <br />with existing topography and accepted engineering practice (refer to Map <br />No.'s 8-1, 8A-9A, 8A-9B, and 8A-9C). Coordination between horizontal and <br />vertical alignment ensures the haul road will not cause envirorm~ertal <br />damage. <br />The Orchard Valley West Mine haul road has a horizontal alignment <br />• consistent with the Roatcap access road, existing topography, and accepted <br />engineering practice. Coordination between horizontal and vertical <br />alignment ensures the road will not cause environmental damage (refer to <br />sheet 7 of the Orchard Valley West Portals designs, Volume 6). <br />The Orchard Valley R-0-M coal stockpile haul road has a horizontal <br />alignment consistent with the existing roadway accessing the area. <br />Utilizing the existing roadway ensures further environmental damage will <br />not occur. <br />(3) (c) (i) <br />Information for the Orchard Valley Mine haul road is included in the <br />Stability Analyses Appendix, Volume 6, prepared for GwI by geotechnical <br />and soils consultants under the direction of Merrick & Co., Denver, ~. <br />Geotechnical analyses for the Orchard Valley west Mine haul road shows the <br />minimum safety factor of 1.5. Appropriate designs have been completed by <br />Golder Associates of Golden, QU. See Volume 6. <br />Geotechnical analyses of the Orchard Valley R-O-M coal stockpile haul road <br />is presented in Volume 6 (refer to Supplemental Geotechnical Fhgineering <br />Study, Law Grade Coal Haul Road, Lambert and Associates). No cut slopes <br />steeper than 1.5h:1v were utilized in the R-0-M coal stockpile haul road <br />construction. <br />(3) (c) (ii) <br />The Orchard Valley Mine haul road is an existing structure. If any <br />TR 92-18 Revised 07/08/94 <br />5 <br />