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• pushed back against the cut areas from where it originally came until the level areas are eliminated <br />and there is no discernible break in slope. The final layers will subsequently be furrowed and <br />scarified before topsoiling. The slope of the regraded surface will be varied to approximate <br />drainages that existed before initial disturbance. Overall, final surface configurations after <br />reclamation will be more stable than the original slopes, since many existing scopes were unstable <br />and highly eroded. No regraded slopes will exceed 2h:1v. For areas where fill heights exceed 10 <br />feet, the new fill areas will be keyed into the underlying level area. Cut and fill terraces are not <br />required for stability or erosion control and will not be utilized. <br />Gravel surfaces will be scarified and mixed with the subgrade material during regrading. Concrete <br />pavements, footings, etc., will be buried a minimum of four feet. Pipes, cable, and bituminous <br />material will be separated by contractors and disposed of in an approved fashion. Buried pipelines <br />that will not be disturbed during final grading activities will be left in place. All power lines and pole <br />structures except for the 138-kV lines will be removed. <br />If, after regrading and revegetation, rills and gullies deeper than nine inches form in the regraded <br />areas, they will be filled, graded or otherwise stabilized and the affected area revegetated. <br />Drainage channels created in the regraded sections to conform to the natural terrain will be rip- <br />rapped or otherwise protected as required to prevent erosion. <br />Exposed unoxidized coal seams and refuse disposal areas will be covered with a minimum of 2.5 <br />feet of the best available nontoxic, nonacid forming material. The 2.5' cover is a variance from the <br />standard minimum cover of 4 feet. DMG approved this variance (TR45) as a result of the <br />revegetation study as described in Section V.G.1. Under such conditions, the compaction and <br />drainage protection procedures will be as specified by the appropriate regulatory agencies. <br />V.G.1 Revegetation Studv with Various Tousoil Depths <br />The objective of this study was to investigate whether successful revegetation could be achieved <br />with atopsoil/subsoil cover thickness of less than four feet. If the study showed that a lower <br />topsoil/subsoil cover thickness could achieve successful revegetation, then BME would request a <br />variance from the four feet cover requirement. The variance would establish the cover depth shown <br />to be adequate by the study as the revegetation success standard. Greystone Consultants of <br />Englewood, Colorado were retained to conduct the study, report the findings and recommend the <br />appropriate cover thickness. <br />• Several conclusions and recommendations were made as a result of this study: <br />C~ <br />(Permit Renewal f17, 8199) V-24 <br />