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Mate Reg_, <br />spaced per Part 4.03.1(4)(e)(vi)(A) since the regrniired spacing • <br />wand concentrate cross drainage and create erosion on slopes <br />that are not now subject to wncentrated gullying. The <br />alternative proposed is to carry drainage to the major incised <br />drainage channels which are essentially cut to the bedrock <br />level as they now exist. Drainage ditches and culverts are <br />designed to hanile the l0-year, 24-hour precipitation event. <br />Culvert and ditch locations are shoran on F~ibit 7-7. 0.tlvert <br />specifications are shown on Table 12-6 aryl in Appendix 12-2. <br />When drainage ditches discharge onto open terrain, a number of <br />measures will be taken to protect the slope frcan erosion. <br />When the drainage discharges onto a disturbed area, the area <br />will be revegetated to ~ntrol runoff. In an area where <br />revegetation would not be sufficient to control erosion, the <br />area will also be riprapped. Ten~orary meastses to reduce <br />erosion will be e~loyed while the area is undergoing • <br />revegetation such as straw dikes, containment ditches, etc. <br />Haul road berms are rem ~ i red by the Mine Safety aryl Health <br />Administration (MSHA) on all haul road embanlanents. With the <br />creation of these berms, drainage ditches (not required by <br />Q4LR Regs.) are created next to the berm. Peabody has <br />recently received approval from MSHA to intentionally breach <br />these berms to release the water periodically along the haul <br />roads. Water on the roads, especially during the winter and <br />spring, is not only dangerous but aids in the deterioration of <br />the road base aril surface. It appears that CIff Ft's main <br />objection to this practice is the erosion potential. Due to <br />the steepness of slope at Seneca II, some form of erosion is <br />unavoidable. The erosion is generally slight, all runoff <br />continues to flow through a sedimentation pond, and more often <br />than not, these erosional problems are in areas that have not <br />yet been reclaimed. If, in reclaimed areas, the erosional • <br />problem 1,r~rY,~G excessive, Peabody will work with Q4LR on <br />12-29 Revised 12/10/92 <br />