2020-06-16_PERMIT FILE - M2020007 (7)

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EXHIBIT L RECLAMATION COST ESTIMATE(cont) will be required, so 647, 680 yards of fill material is needed for backfilling. No seeding is needed, as area will become cropland. Phase 3 is disturbed as it will be used as a processing plant and stockpiling area, potential drying pad for settling pond fines, overburden storage, topsoil storage and equipment parking areas . Approximately 60 . 6 acres will be disturbed on this stage, and they would need to be resoiled (91, 500 yards) and graded. This area will be reclaimed as cropland, so no seeding would be done until the farmer puts it back into production. Estimated concrete foundations to remove for processing plant is 200 yds of concrete . The slurry wall is not installed since mining has not started in this Phase so cost is not included. The calculations in this estimate are for bonding the slurry wall liner uses the estimated length of the slurry wall , in the effected Phases (Phase 1) , times the average depth, which includes the bedrock key. The estimated unit cost is based on DRMS past bond calculation of $5 . 00/sq-ft with no reduction for certificate construction. Dewatering costs are based on dewatering all of Phase 1 or 64 . 31 acres, average depth 29 ft . For the slopes volumes, there would be 11 . 47 acres of 3 : 1 (166 ac-ft) , 2 . 40 acres of near vertical (35 . 0 ac-ft) slopes , and the floor area of 52 . 84 acres (1 , 532 ac-ft) . Total water volume to de-water in the Phase 1 lake area is 1733 . 48 ac-ft (number is total depths plus half of slope areas times 29 ft . ) . The aquifer inflow (transmissivity) would be 72 , 300 gal/day/sq-ft according to our records . Total dewatering time includes 21 . 8 days to pump the lake, 5 . 66 days to build slopes and 0 . 23 days to pump recharge . The total pumping time is rounded to 28 . 0 days . The settling ponds areas can be push-filled to a level 2 foot over the ground water table, so no dewatering cost is included for Phase 1A. The Equipment Used in the Estimate Is: Scraper teams - 2-Cat 627G scraper, D9R Dozer, 140H grader & water truck - Resoiling & backfilling Grader - Cat 140H - seedbed prep and ripping plant site Loader - Cat 688 - armoring placement Dozers - 2 - Cat D9R - cut/fill working face sloping Dewatering Pump data 3-600M (6000 gpm each) , 1511 , 121'suction & discharge hoses - total (18 , 000 gpm) Seeding team - standard farm tractor and pull behind drill , and crimping disk attachment L.G.Everist,Inc. Ragsdale Reservoirs June 11,2020