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• Previous mining experience has shown overburden swell to be approximately <br />equivalent to the volume of mined coal. Therefore, grading to achieve <br />approximate original contours is not a problem. However, where surface stabi- <br />lity can be enhanced by surficial treatments such as pitting, contour <br />turrowi~g and the tike, this will be done. Basic drainage patterns will not be <br />altered. Once again, though, if improvements in sediment and runoff can be <br />achieved by such techniques as water bars, water spreaders, contour turrows, <br />energy dissipators, and son on, these will be used. <br />Roads and sediment ponds will not be reclaimed, but disturbances appur- <br />tenent to these structures will be stabilized and revegetated. <br />Pit 6 will also be backfilled and graded. Final slopes will be laid back <br />somewhat less steep than pre-existing slopes but otherwise final contours will <br />be the same. Outcropping coal with be buried by at least 4 teet of safe, non- <br />toxic material. The final fill surface will be scarified prior to placement <br />of topsoil. <br />• Care will be taken not to compact the top 2 or 3 feet of overburden in <br />order to provide an adequate zone beneath the topsoil allowing water per- <br />colation and penetration by roots. On sloping areas the graded surface of the <br />overburden will be made irregular in order to help hold the topsoil on the <br />scope. all regraded surfaces will be mechanically loosened (scarified) prior <br />to redistribution of topsoil to insure a stable interface. <br />2.05.4(2)(d) Topsoil Redistribution <br />Table 3 shows available topsoil volumes for each area to be developed. <br />These estimates were made based on information presented in the soils baseline <br />report. All of the soil except unit 103 is suitable for stripping and stock- <br />piling. Unit 103 has a very thin surface horizon, less than 2 inches, <br />underlain by clayey or rocky substrata. Considering the abundance of high <br />quality topsoil, the small areas of unit 103 soil will not be stripped. <br /> <br />IV-5 <br />12/87 <br />