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G. Reclamation of Shop-Warehouse Pad: !~ <br />The shop-warehouse pad is also within the area designated for potential slide <br />activity. As such, a dewatering system will be installed to stabilize the shop- <br />warehouse pad during the construction and operational stages of the iVlt. Gunnison <br />14vie. <br />The shop-warehouse pad is different from other building pads in the landslide area <br />in that it has a downslope (fill side) retaining wall, taut no upslope (cut side) <br />retaining wall The recommended reclamation procedures for ensuring a stability <br />Factor of Safety of 1.3 are the same as for the substation pad. The dewatering of <br />this area must be continued alter all reclamation activities have been completed. <br />Once aII superstructures have been removed, the downslope retaining walls can be <br />removed and the section can be backfilled in uniform layers to at least 85% of the <br />ma~dmum Standard Proctor Density. Backfill should continue until the area is <br />returned to its appro~dmate original contours (AOC) <br />H Reclamation of Portal Bench: <br />The Portal Bench area is also within the area designated for potential slide <br />activity. As such, both a horizontal drain system and a french drain have been <br />designed and will be installed to stabilize the portal bench and upper slope during <br />the construction and operational stages of the mine. <br />The portal bench is comparable to the situation of the Portal Turnout at Access <br />- Road Station 65+00. The recommended reclamation procedures for ensuring a <br />-% stability Factor of Safety of 1.3 are similar to these recommended for that case. <br />The dewatering of this area must be continued after all reclamation activities have <br />been completed. Once the conveyor system,guard rails, and other miscellaneous <br />bench structures have been removed and salvaged, the section can be backfilled in <br />uniform layers to at least 85% of the maximum Standard Proctor Density. The <br />retaining walls at the Portal Entries should be left in place to increase local <br />stability in this area. The top segment of the wall, however, should be removed <br />. below the anticipated topsoil depth Backfill should continue until the area is <br />returned to its approximate original contours (AOC). <br />Therefore, at the Portal Bench the following reclamation procedure is <br />recommended to ensure a stability Factor of Safety of 1.3 of more. <br />1. Inspect the horizontal drain outlets and french drain outlets to ensure that <br />the dewatering system is operating properly. Check all piezometer levels <br />and take any necessary measures to protect the piezometer installations. <br />2. Carefully remove and dispose of the concrete structures protecting the <br />outlets of the horizontal drains. <br />3. Remove all mine conveyors, guard rails and miscellaneous bench structures. <br />4. Remove top portion of the portal retaining wall structures so that the top of <br />the well is below the proposed top soil depth. <br />5. Construct a bulkhead for each entry, providing for drainage through the <br />backfill zone, if necessary. <br />6. Backfill to the approximate original contours (AOC), minus topsail depth, in <br />uniform 8° lifts. Backfill to at least 85% of maximum Standard Proctor <br />Density. <br />10 <br />