2021-02-05_PERMIT FILE - M2020041

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The US ACOE has assigned file number SPK-2020-00743 to the delineation request that we submitted. US ACOE is reviewing the delineation submittal and will field confirm it in the spring, when weather permits. At the request of the US ACOE, Peak Materials provided the US ACOE with the wetland delineation under a different submittal type. Therefore, a revised Appendix J-1 has been provided to keep the DRMS application file up to date. EXHIBIT L - Reclamation Costs (Rule 6.4.12): DRMS has calculated the required reclamation bond for the proposed operation based on information provided in the application, adequacy response, and DRMS's estimate of the maximum allowed disturbance for the operation as proposed. The DRMS bond estimate was calculated using the CIRCES software based on the following assumptions: • Maximum allowed disturbance for the site will be considered to be at the end of Phase I mining, when up to 54 acres may require replacement of overburden and topsoil,final grading, and revegetation. The total area requiring this work will decrease as the size of the proposed unlined lakes increases during Phase II of mining(f approved). • Topsoil and overburden volumes, average haul distances, and equipment(truck, loader, and dozer) as provided in the initial adequacy response have been utilized.A water truck for dust control has also been included for these earthmoving tasks. • All internal slopes for Phase I mining will be mined at 3:1 or flatter. • Revised seed mix/rates, mulching, and tree counts provided have been utilized, and an initial seeding failure rate of 25%has been assumed. • A permanent augmentation plan will be approved by the State Engineer's Office Division of Water Resources prior to exposure of any groundwater on-site • No processing or stockpiling ofprocessed material will take place on site • All on-site support equipment brought to the site during operation—toilets,fuel trailers, etc, will be portable, and be able to be removed from the site by the owner for the amount stated in the provided estimate. The total bond required_ or the proposed permit utilizing the above assumptions is$364,465.00. If the applicant wishes to implement a "phased bonding"approach, significantly more specific detail will need to be provided for concurrent mining and reclamation plans, as well as commitments to maximum disturbed acreage for each proposed phase of mining/reclamation. A summary of the cost estimate provided has been attached to this letter. Detailed breakdowns for each task listed can be provided upon request. Peak Materials accepts the Division's bond calculation of$364,465.00. 5 Greg I—icki and A—i.IM PLIA'