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• The slopes of the regraded areas will be similar to the slopes encountered on the pre-mined land and are <br />also approximated on Meip M12, Postmining Topography. <br />3.5.5 Final Hiohwalls <br />Final highwalls are exposed during the last cut of a particular pit. The extent of each highwall is com- <br />pletely dependent upon the extent and depth of the coal seam being recovered. Two final cuts are <br />anticipated during the permit term, one in East Ashmore pit and one where Derringer an pRs <br />come together. Final highwalls will be fragmented and regraded to approximate original contour as shown <br />on the Postmining Topography Map, Map M12. The area where Derringer and Enfield pits come together <br />will be utilized as a future long-term ash disposal site. This will aid in establishing the post-mining <br />configuration. <br />Map M55 shows the area of disturbance to be left during the temporary abandonment of Enfield Pit. As <br />shown, a maximum of 82 acres of graded but not topsoiled spoils, 36 acres of open pit and 22 acres of <br />prestripped area was left. The open pit was "cast blast" to further stabilize the area. The size of unre- <br />claimed area in Enfield F'it allows Trapper to remain within bond and sediment storage volume constraints <br />until D pit is complete. <br />During the interim while both pits remain open, the E Pit highwall will be managed so as not to endanger <br />men or machinery. There is no evidence that highwalls present any added hazards to wildlife in or adja- <br />• cent to the mine plan area. <br />r1 <br />LJ <br />3-45 <br />....... PR-s <br />~~1_~ <br />