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Blue Pit <br />Basin Ditch Construction <br />112 Permit Amendment <br />The permanent installation of the Basin Ditch will be minimal to its final configuration setup and <br />will not require backfilling at all for reclamation purposes. There is no cost for this item. <br />Catchment Benches, Ditches, Concrete Grouted Channels and Energy Dissipation Rock <br />As shown on Map F, many catchment benches with ditches must be constructed on the final 3H:iV <br />slope to prevent erosion. These ditches will lead to grouted channels which will deliver the runoff <br />water to the bottom of the reclaimed pit areas. As described in the Reclamation Plan, large energy <br />dissipation rock will be needed at the toe of each grouted channel. This rock will be available on <br />site and collected during mining for later use in this reclamation. The estimated cost of installation <br />of the catch benches and ditches is $1 per foot. The estimated cost of installation of the grouted <br />channels is $6 per foot. The length of catch bench /ditch needed would be 35,399 feet. The length <br />of grouted channel needed would be 3,416.91 feet. Therefore the cost is $35,399 and $20,501. <br />Topsoiling, Seeding and Mulching <br />For the entire worst case reclamation site, the area needing topsoiling, seeding, mulching: <br />Final slopes: 79.9 acres <br />Open Pit floor: 20.1 acres <br />Total area = ioo.o acres <br />Topsoiling will require dozer pushing from the bottom of the slope to the top to place <br />approximately 12 inches of soil over the entire area, which includes the rangeland slopes of 3H:1V <br />as well as the irrigated pastureland area at the bottom western area portion of the site area. <br />Soil Preparation <br />Topsoil places in bottom areas and slopes will be thoroughly ripped up, or disced prior to seeding. <br />Worst case reclamation costs for this scenario are shown in <br />Table 7 below: <br />Table 7: Worst Case Reclamation Cost Table <br />Final grading of 500' of 1.51-1:1V to 3H:1V side slopes: <br />137,867 yd3 needed 2 $ 310,201 <br />137,867 yd3 overburden from most recent mining @ $2.25/yd3 <br />Backfill slopes around facilities in Area 1: 4 $ 1,096,923 <br />359,647 yd3 @ $3.05/ yd3 <br />Remove all diesel tanks, truck scale and foundation, various surface 2 $ 10,500 <br />supplies and final gravel stockpiles <br />Blue Pit May 2014 L -2 <br />