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provides uniform, gentle elopes which rill eliminate the <br />concentration of runoff and will alleviate previously e~cper- <br />~~~, <br />fenced erroaion problems at the Bite. The gentle 3 hori- <br />zontal to 1 vertical aide slopes will alloy all runoff! to <br />flow uniformly away from the emban]®eat sad either to the <br />south collection ditch, where it will be directly routed to <br />the sedimentation pond located went of the refuse disposal <br />emban]®ent or directly to the sedimentation pond. Because <br />the aedimeatatioa pond sad ditches were initially designed <br />for a refuse disposal facility similar in size sad configura- <br />tion to that presented herein, no modifications to the drain- <br />age control system other thaw those described above are <br />contemplated by this reviaioa. <br />The entire rock underdrain contained in the initial design <br />was installed by the previous operator. Thin underdraia is <br />visually depicted on crone aectione Al-A1' through E-E' <br />contained in Erhibit D, Disturbed Area of Cross Sections and <br />in Ezhibit F, Coal Proceeaing Waste Embanlonent. The <br />construction o! the rock underdrain was certified as required <br />by Rule 4.09.1 (11> during its construction in 1982 and 1983. <br />A copy of the certification is presented on page 479. A <br />monitor well designed to collect data regarding the impact o! <br />the refuse disposal area on subsurface flows was installed by <br />the previous operator near the west end of the refuse embank- <br />ment just upstream from the aedimentatioa pond. No modiiica- <br />tions to this well or its monitoring and reporting are <br />contemplated by this reviaioa. <br />3. Construction: As with the previous two deaigna, prior to <br />refuse diapoeal in undisturbed areas, all vegetation and soil <br />will be removed from the site. All refuse material will be <br />placed is lilts no greater than 2 feet in vertical thieknesa <br />and will be compacted to at leant 90 percent of the maximum <br />dry density as determined by previous testing of the refuse <br />material. This density is 96.4 pounds per cubic loot. If <br />('`~'1 necessary, a sheep's-foot roller or other compaction device <br />468 <br />ReviBed 1/88 <br />