2022-04-04_PERMIT FILE - M2022013 (23)

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Page 12 6.4.7 EXHIBIT G - Water Information yields. The predicted drawdown associated with the mine dewatering represents the worst-case scenario and a substantial amount of time will be required before maximum drawdowns will occur.' b) POST RECLAMATION IMPACTS have been minimized: i. As reflected in the comments which follow, the operation has sufficient water to leave the resulting basin in an unlined state, negating the requirement to line the basin for purposes of augmenting for evaporative loss. This satisfies any costs for lining the basin since lining the basin is optional and strictly a burden of the operator to pursue to liberate his water from the unlined state. ii. The AWES report of 27 July 2020 evidences that there will be no measurable impacts of either shadowing or mounding if the resulting basin were lined. The operation therefore includes lining of the basin as an optional phase of the reclamation of the resulting basin. Satisfaction of Colorado State Standards as to the integrity and functionality of the resulting lined basin will be made in cooperation with the Colorado Division of Water Resources, and any resulting submittals and approvals made available to the OMLR at the time of the Annual Report, or by separate cover. Whether the basin is lined or unlined, no measurable impacts to the prevailing hydrologic balance are foreseen. iii.The Flow Technologies Report of 22 January 2020, provides a plan of modified basin design to be incorporated into this submittal as a means to minimize erosion of the basin berms while optimizing the integrity of the basin from the South Platte and Big Thompson Rivers during a 100-year flood event. iv.Addendum to the Flow Technologies Report, above; find overflow protection design specifications of 30 August 2013, as determined by Varra Companies, Inc., Brad Jones, P.E. (2) (a) Please refer to Exhibit C-1: Existing Conditions Map. (b) The known aquifer under the site is the stream alluvium. (c) Discharge water will be dissipated with hard surface riprap or established grassed waterways. Other waters are retained by internal pit drainage, directed by vegetated berms or established waterways or through the maintenance or establishment of a stabilizing cover of vegetation, or as otherwise established under an approved Colorado Department of Health stormwater permit and/or stormwater discharge permit. (3) The three components of the project water requirements are water removed for dust control, water removed with the product, and evaporation from exposed ground water. Dust will be controlled using truck sprinklers, and the estimated frequency is one to ten loads per day depending upon field conditions. Dust will be controlled using truck sprinklers, and the estimated frequency varies daily VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION WING&SAFETY OFFICE OF MINED LAND RECLAMATION