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provides uniform, gentle alopea which will eliminate the ' concentration of runoff and will alleviate previously exper- ienced erroeion problems at the site. The gentle 3 hori- zontal to 1 vertical aide alopea will allow all runoff to flow uniformly away from the embanl~eat and either to the south collection ditch, where it will be directly routed to the sedimentation pond located west of the refuse disposal embanlonent or directly to the sedimentation pond. Because the sedimentation pond and ditches were initially designed for a refuse diapoeal facility similar is size and configura- tion to that presented herein, no modifications to the drain- age control system other than those described above are contemplated by this revision. The entire rock uaderdrain contained in the initial design was installed by the previous operator. This uaderdrain is visually depicted oa crone aectioat Al-A1' through E-E' contained is Exhibit D, Disturbed Area o! Cross Sections aa~ is Exhibit F~,Coal Processing Waste Embaal~~ ..-'The \1 . construction of the rock uaderdrain was certified as required I by Ru_~ 9._1 C11) during its construction in_1982 and 1983_ A copy of the certification is presented oa page 479. A monitor well designed to collect data regarding the impact of the refuse diapoeal area on subsurface flows was installed by the previous operator near the west end of the refuse embank- ment just upstress from the aedimeatatioa pond. No modifica- tions to this well or its monitoring and reporting are contemplated by this revision. 3. Construction: M with the previous two designs, prior to refuse diapoeal in undisturbed areas, all vegetation and soil will be removed from the site. All reiuae material will be placed in lifts no greater than 2 feet in vertical thickness and will be compacted to at least 90 percent of the maximum dry density ae determined by previous tenting of the refuse material. This density is 96.4 pounds per cubic loot. If . necessary, a sheep's-toot roller or other compaction device 468 Revised 1/88