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RULE 4 PERFORMANCE STANDARDS <br />4.23.10 Backfill and Grading Requirements <br />Highwall mining will be conducted in accordance with the backfilling and grading requirements of 4.14. <br />4.23.11 Highwall Shall be Eliminated <br />Highwall mining is proposed to occur in areas previously mined with adequate material on hand to <br />backfill the pits with proper static safety factors for stability to the approved postmining topography <br />thereby eliminating all highwalls. Any minimal spoil material generated by the highwall mining <br />operation will be buried at depth in the pit backfill. All coal seams mined will be adequately covered by <br />pit backfilling in conformance with the permitted PMT and reclamation plan. No remnant highwalls will <br />be left at conclusion of the reclamation activities and no spoil material will be place on any outslopes. <br />Rule 4 Performance Standards 4.23-3 Revision Date: 6/23/08 <br />Revision No.: MR-91