2012-10-24_REVISION - M1999120 - Laserfiche WebLink

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EXHIBIT L RECLAMATION COSTS (10/22/12) L.G. Everist, Inc. - Fort Lupton Sand and Gravel M -1999 -120 This reclamation cost estimate is based on the assumption that no more then 155.00 acres will need some form of reclamation at any one time. Of this, 136.06 acres will need revegetation and resoiling and 18.05 acres is road area. The 79.0 acre Plant Site as shown on the Mining Plan Map - Exhibit C -1, covers parts of 3 stages. The scale area in the Parker - Panowicz Stage and G &S Solutions plant area in the Swingle South Stage are included under the Stage where they are located. The Tables L1, L2, and L3 contain all the base information used to calculate this estimate. The disturbed areas include, the plant site; roads; slurry wall construction pads and staging areas; the above water areas around active mining areas that are stripped, partially mined or partially reclaimed areas. Between the two mines there are 3 certified slurry walls; 1 installed wall which is not certified and has exposed water; and 4 walls that will be installed by late October 2012 but will not have exposed water. The slurry wall depths to bottom of key trench and as built lengths are shown in the Table L3. We have included a factor of 20% for the Division to do remedial work on the completed liners if OSE certification is not accomplished. The total potential water surface area in the uncertified reser- voir area is estimated to be 25.20 acres that is in the Meadows West reservoir area. The dewatering calculations are shown in Table L2. We rounded the pumping time to the next day and used 72,300 gal /day as a transmissivity number to figure inflow from the aquifer. These figures are then used in the calculations for the bond amount. In this estimate we would have to complete bank backfilling on 16,650 linear feet at 41.68 cyd /linear ft. The slurry wall platforms would only need grading and seeding as they were /are built using growth medium and fines from the mine area. The volume of concrete contained in the foundations of the scale and the processing plant is 125 yards. A 627C Cat motor scraper or similar equipment will be used to resoil the area and a 140G Cat motor grader or similar equip- ment will be used to shape the seed bed, the resoiled areas and rip the plant site. A D8N Cat dozer or similar equipment will be used to reconstruct the compacted liner on the perimeter of the reservoirs. The tables below outline the various areas of disturbance at the time described above. 1