2014-06-25_REVISION - M1977522 - Laserfiche WebLink

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EXHIBIT L RECLAMATION COSTS REVISED June 25, 2014 The current bond for the Star Water Resource is $103 , 754 . 00 . As part of this Amendment it will be necessary to recalculate the surety to include the total disturbance area, and account for the slurry wall to be installed. We have chosen to calculate this bond based on the current plan to install a slurry wall around the western lake only. We have included a cost to complete bank sloping in that area since underwater sloping is not completed at this time . At this time, L.G. Everist has implemented Option B, that is to backfill 8 .44 acres of post-1981 lake area leaving the 6 . 10 pre-1981 lake. This is a change from what was originally proposed involving building a slurry wall around the western lake to address evaporative loss issues . It will be necessary to remove material from the bottom of the reservoir to create a hard bottom on the reservoir. This material will be used to reclaim the post-1981 lake area of the eastern lake . It will involve placing 138, 635 cubic yards (includes swell factor 1 . 12) in the 8 .44 acres to a depth of 2 feet above the ground water level . There is adequate material on site to backfill the lake so none would have to be imported. Material could be removed from the area above the water area in the eastern area or from the bottom of the west lake after dewatering is done for sloping. Most of the area around the eastern lake and part of the upper side of the western area has been seeded and not redisturbed at this time. This reclamation cost estimate is based on the assumption that no more than 90 . 63 acres will need some form of reclamation at any one time. Of this, 22 .25 acres will need revegetation and resoiling; 9 . 36 acres is industrial area; 4 .26 acres is road area; 33 . 83 acres would be covered by water that needs to be pumped for sloping. Three areas would not need reclamation the 0 . 68 acres oil facility area, 0 . 87 acre overflow ROW; the 6 . 10 acres of pre-1981 lake area and 13 .28 acres that is reclaimed. The Tables L1, L2, and L3 contain all the base information used to calculate this estimate. The disturbed areas include the roads, slurry wall construction pads and the above-water areas around active mining areas . In addition, minor slope shaping may be necessary on the below-water areas in the eastern reservoir to complete the 3h to 1v slopes . In this estimate, there will be one certified slurry wall that will be installed by mid-summer 2014 but will not expose water since the site is being dewatered. The cost to backfill the post-1981 area is added to address Office of the State Engineer regulation and no additional below-water sloping is planned in that area. The slurry wall depth is to the bottom of the key trench and the estimated length is shown in the Table L3 . We