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• <br />roadway. Straight portions of the road were crowned about 6 inches in the <br />middle, allowing water to drain to both sides, and turns and switchback areas <br />were graded to direct surface to the inside ditch. A berm of at least 3.5 feet <br />in height, with 1 to 1.5 vertical-to-horizontal slopes, was constructed along <br />all outslopes to provide safety during wet periods and winter months. <br />The haul road surface, consisting of 16 inches of pit-run, sub-base <br />r1 <br />U <br />• <br />material and 8 inches of 0.75-inch minus road-base material, was obtained from <br />W. R. Hall Construction Company gravel pits approximately six miles away. The <br />material was a clean, non-toxic product which met the standards of, and is used <br />by, the Colorado Department of Highways and Routt County for road construction <br />in the area. Compacting was done by a model 825-B Caterpillar compactor and <br />Ray-Go vibrating compactor. <br />During haul road construction, ten culverts (Map 8) were installed in <br />accordance with CMILRD stipulations to improve road stability while safely con- <br />veying the peak runoff from the 10-year, 24-hour storm event from the road <br />disturbed area. In 1978, Sun Coal Company, pursuant to Sun Coal Company's haul <br />road surface water runoff mitigatioh plan, installed ditch runouts with sediment <br />traps, constructed a Yampa River sedimentation pond, and repaired haul road <br />drainage ditches (see Tables 2.05.3-1, 2.05.3-2, and 2.05.3-3 for culvert and <br />runout calculations). <br />-165- <br />(Rev. 5/86) <br />