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Chapter II <br /> Compaction tests performed on this material <br /> indicated maximum dry densities between 88.2 to <br /> 93.4 pcf. <br /> Stability analyses of both the existing and proposed <br /> refuse pile indicated acceptable factors of safety, <br /> higher than 1.5 for both the existing refuse pile <br /> configurations with slopes 38 degrees and for the <br /> proposed pile, with a slope equal to 27 degrees <br /> (approximately 2(H) : 1 M), for a slope height of <br /> 300 feet. <br /> As MLRD regulations require the maximum slope of <br /> the waste disposal facility not to exceed 2(H) : 1 M, <br /> further extensions of the waste disposal and the new <br /> waste disposal facilities were designed in slopes not <br /> exceeding 2(H) : 1 M. <br /> Mid-Continent transported the coal refuse from the <br /> wash plant to the disposal site by a conveyor belt. A <br /> dozer then spread and compacted the refuse in <br /> layers not exceeding 12 inches in thickness. <br /> Reclamation of the old pile is ongoing, at the rate of 3 to 5 acres per year. <br /> As stated in the rill and gully plan for the old refuse pile: <br /> Portions of this pile date back to 1956 and are thus grandfathered. Some of these <br /> old portions have been reclaimed while others have not. It will be our policy to <br /> continue reclamation on these old areas as time, money and technology permit. <br /> The portion of the old pile that was constructed after 1977 will be inspected as snow <br /> cover allows; inspections to identify erosion problems will be conducted once per <br /> month from May through July. Inspection will also be made after any significant <br /> rainfall event. If any (problems) are noted, temporary control will be established by <br /> hay bales or parts of bales being placed at prudent intervals along the rill or gully <br /> within 10 days of detection. <br /> When the refuse pile dries out (generally July or August), mechancial methods will <br /> be used to remove or fill the rills and gullies: i.e., small rubber-tired backhoe or D-3 <br /> tractor. In some cases (steep slope areas) (1:1 only) soil conservation type log or <br /> rock check dam structures will be utilized. <br /> All disturbed areas will be reseeded and mulched using hand-broadcast methods, <br /> thus again minimizing any impact to existing vegetation. <br /> 43 <br />