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• Road alignments follow existing roads, ridge lines, and stable slopes. In addition, they follow the <br />topography so as to minimize cuts and fills, avoid flood plains, and cross drainages at <br />approximate right angles. Except for crossings, no segment of haul road is located in the channel <br />of an ephemeral, intermittent, or perennial stream. Intermittent or perennial natural drainages are <br />not altered or relocated. No unique, endangered, or special environmental or cultural resources <br />are known to be impacted by the haul road system. <br />Haul road geometric criteria will be appropriate for the anticipated traffic and meet safety and <br />stability requirements. The design maximum speed is 25 miles per hour, reduced as required to <br />provide a sight distance of three times the braking distance (a distance depended upon grade, <br />loads, and speed). The minimum radius curve will be 100 feet and grades will be limited to 10% <br />(with, perhaps, pitches up to 15% for distances no exceeding 200 feet within any consecutive <br />1000 feet). ' <br />A 30 to 50-foot-wide travel way is proposed for most haul road segments. Haul road width may <br />be reduced to 30-feet with turnouts in reaches of steep side-slopes to reduce surface disturbance <br />and extensive cut or fill slopes. The travel way will be crowned (5%) and ditched with culverts to <br />prevent ponding. Typical cross sections aze shown in Figures 2.05.3-8 through 2.05.3-11 for <br />various side slopes. As shown on Map 2.05.3-36, the Jeff Canyon Haul Road will need few <br />culverts because it follows the ridge line. Table 2.05.3-1a summarizes the results from numerous <br />site-specific SEDCAD culvert designs and allows LCC to quickly determine culvert sizes based <br />on drainage azea. The Lorencito Canyon Haul Road crosses the Purgatoire River via the Segundo <br />• Bridge which has been recently replaced by a consortium of users. <br />Vegetation will be cleazed for no more than the width needed for the roadway, drainage control, <br />and any cut and fill. Topsoil will be removed from road cut and embankment footprints and <br />stored for use in reclamation and as a vegetation growth medium for cut and fill slopes. <br />Cut slopes will not be steeper than 1.Sh:ly in unconsolidated materials or 0.25h:1v in rock. In <br />azeas of steep side slopes, the road alignment will be shifted so that the entire road width rests on <br />the cut benches. <br />All vegetative material and the upper two feet of topsoil will be removed from embankment <br />foundation azeas during the initial phases of construction. No vegetative material or topsoil will <br />be placed beneath any haul road embankments. Embankment materials will be free of organic <br />matter, peat, or other unsuitable (acid-producing) materials. Excess or unsuitable materials will <br />be disposed of in accordance with Rule 4.09.1 of the Boazd's regulations. In the event an <br />embankment is required on side-slopes greater than 20%, the embankment will be plowed, <br />stepped, or keyed. Embankment slopes will not be steeper than 2h:ly unless the material consists <br />of a minimum of 85% rock, in which case the slopes may be placed up to 1.35h:1v. Embankment <br />materials containing less than 25% of rock larger than 6 inches will be placed in uniform layers <br />not exceeding 12 inches before compaction, and compacted to at least 95 percent of standard <br />proctor maximum dry density (ASTM D 698). Moisture conditioning of the fill material to 3 <br />percent below optimum to 3 percent above optimum moisture content will be obtained prior to <br />u <br />Page 2.05-17 and l7a R°le 2 Permits (Fe6.19.03).doc 2.05-17 (Revised 02/19/03) <br />