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on Exhibit 6D. In all cases, coal and coal waste material placed <br />within fill areas shall not be covered with less than 4 feet <br />(measured vertically) of non-coal fill material with the regraded <br />surface at the final contours shown on Exhibits 4A and 48. There is <br />a possibility that after completing the required cut and fill work <br />in the coal conveyor and coal stockpile areas, same coal and/or coal <br />waste material will remain on the regraded surface at the base of <br />the excavated or cut areas. In this event, all coal and/or coal <br />waste remaining on the surface shall either be removed: 1) down to <br />non-coal material if the coal layer is less than 4 feet thick; or 2) <br />a minimum of 4 feet below final grade. The excavations resulting <br />from this activity shall be back filled to final grade using non-coal <br />fill material. <br />Compaction <br />All fill material, both coal and non-coal, obtained from cut areas <br />and placed within fill areas, shall be placed in maximum 2 ft. <br />horizontal lifts and compacted by making 4 to 6 series of staggered <br />passes over the entire surface of each lift with rubber tired <br />equipment, sheepsfoot roller(s), or other appropriate compactian <br />equipment. Track mounted equipment such as bulldozers or hydraulic <br />excavators is not considered appropriate for use in compaction <br />work. Compaction work is not required within the upper extremity of <br />the bench backfill areas where the fill width becomes too narrow for <br />safe compaction equipment access. The final upper 2 ft. lift and <br />all other fill area surfaces for a depth of 2 ft, below grade shall <br />be left uncompacted. <br />Working Area Limits <br />The edges of all cut and fill areas at the working area boundary and <br />along all established shrub/tree stands and undisturbed areas shall <br />be graded or tapered to create a smooth (plus or minus 6 in.) <br />transition between the final regraded surface and undisturbed <br />surfaces or surfaces outside the working area boundary. Care shall <br />be taken during regrading activities to prevent damage to <br />established vegetation. Earthwork and regrading activities of any <br />nature shall remain at all times within the working area limits <br />shown on Exhibits 3A and 36 except as allowed in the specifications <br />or by the PROJECT MANAGER. Earthwork and regrading activities shall <br />also at all times remain outside of established shrub/tree stands <br />located within the working area limits. These areas are shown on <br />Exhibits 5A and 5B as the "N" labeled regions. <br />Subsurface Mining Related Materials <br />Any subsurface mining related materials and utility features such as <br />pipe, hose, tubing, culverts, tanks, drums, concrete, wood blanks or <br />timbers, wiring, cable, and conduit which are excavated during <br />regrading work or which are visible on the surface after regrading <br />-17- <br />