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Environment, Inc.Page 3 <br />Adequacy Response #3 June 26, 2020 <br />M-2020-007 <br />Thank you for the suggestions they will incorporated when the notices are <br />prepared and testing begins. <br />EXHIBIT L - Reclamation Costs (Rule 6.4.12): <br />All information necessary to calculate the costs of reclamation must be submitted and broken <br />down into the various major phases of reclamation. You must provide sufficient information to <br />calculate the cost of reclamation that would be incurred by the state. Based on the information <br />provided for the phased mining DRMS suggests the following breakdown for calculation of the <br />required bond at this time: <br />Phases 1a/2a – Cost to: <br />• backfill each phase excavation to original grade after mining at 3:1 slope; <br />• replace 10” topsoil; <br />• prepare disturbed areas for crop planting the following season or revegetate with <br />provided seed mix. <br />. <br />Phases 1 and 2 – Cost for: <br />• 100% installation cost for slurry walls if groundwater will be exposed prior to <br />obtaining provisional approval of slurry wall from SEO - Slurry wall bonding <br />may be reduced to 20% of total cost when provisional approval by SEO is <br />obtained prior to exposing groundwater; <br />• final grading for pit slopes which have been mined at a 3:1 slope; <br />• replace 10” of topsoil around perimeter above high water line; <br />• revegetate perimeter areas using provided seed mix; <br />• Costs for design and installation of appropriate pit wall and lateral berm <br />protection will need to be included if utilized and in order to bond slurry wall at <br />20% rate. (see Exhibit E comments). <br />Phase 3 – Cost for: <br />• removal and disposal of all concrete pads/footers for plant, scale, office, <br />conveyor, etc.; <br />• removal of all buildings and other site facilities; <br />• backfill settling pond <br />• rip/regrade all affected area; <br />• replace 10” topsoil over affected area and prepare for crop planting the following <br />season or revegetate with provided seed mix; <br />Six tables have been prepared showing the direct costs for Phase 1, 1A, 2, <br />2A, 3. The floating costs tables has the working areas associated with the <br />mine face, stripped areas, weed control and sequential armoring. The Phase <br />tables show the total cost to reclaim each Phase but the numbers that are