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from floor to roof. Additional material will be excavated as needed to accomplish backfilling <br /> of the highwall. <br /> Upon completion of the task, the top of the fill at the south entry will extend ten (10) feet <br /> above the block wall corner at the south east edge of the entry opening. This ten 0 0) feet <br /> backfill height will be maintained for the length of the highwall, which is estimated to be <br /> fifteen (15) feet in length. The fill shall be compacted in six (6) foot lifts by a sheep's foot <br /> roller. Upon completion, the outslope of the fill shall toe into the concrete wall remnant <br /> located approximately twenty (20) feet outside the entry. <br /> Upon completion of the task,the top of the fill at the north entry will extend twelve (12) feet <br /> above ground level. This twelve (12) feet backfill height will be maintained for the length of <br /> the highwall, which is estimated to be fifteen (15) feet in length. The fill shall be compacted <br /> in six (6) foot lifts by a sheep's foot roller. Upon completion, the outslope of the fill shall not <br /> exceed 1 H:1 V. <br /> The remaining bench remnant shall be graded to ensure that water drains away from the base <br /> of the fill area toward the bench outslope. <br /> A contour furrow will be constructed on the bench remnant to contain runoff in order to help <br /> prevent sediment transport away from the Mine 2 area. This furrow is described, and will be <br /> constructed and paid for, under Task 5, Surface Drainage: Contour Furrows. <br /> Upon completion of backfilling, grading and drainage construction, the bench remnant shall <br /> be ripped to a depth of eighteen (18) inches. <br /> Task 41i - Mine 2 Fan Access Road <br /> The purpose of the earth work portion of the project at the fan access road is to promote <br /> surface drainage from the road surface as sheet flow whenever possible, thus minimizing the <br /> channelization of water. This will be accomplished by employing one of three techniques as <br /> specified by the PROJECT MANAGER. Some portions of the roads have a relatively flat <br /> gradient. At these locations, the road will be ripped, and graded as needed, so that water <br /> flows across the road surface as sheet flow. In those sections of the roads where the <br /> gradient is steeper, rolling dips will be constructed. In steeper areas, cut out trenches will be <br /> constructed in order to channel water off of the roadway. Rolling dips will be constructed and <br /> paid for under Task 6, Surface Drainage: Rolling Dips. Cut out trenches will be constructed <br /> and paid for under Task 7, Surface Drainage: Cut Out Trenches. <br /> Road drainage culverts shall be decommissioned when located. The culverts will be excavated <br /> and removed if shallow (three feet or less from ground surface to culvert), or pinched closed <br /> if deeply buried. Both ends of culverts left in place will be pinched closed. Upon completion <br /> of the road reclamation project, the remaining road remnant shall be ripped to a depth of <br /> twelve (12) inches. <br /> 17 <br />