2020-06-29_PERMIT FILE - M2020007 (3)

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Environment, Inc. Page 2 Adequacy Response#3 June 26, 2020 M-2020-007 At the current time, the top of the lateral berm is approximately 100 feet wide and will be revegetated except for the oil/gas well access road. Our research found that only the downstream portion of the lateral berm needs armoring to the same standards as any banks within 150 feet of the river. This will add approximately 1,800 feet of bank slope armoring in Phase 2 so the total becomes 3,785 liner feet. The plan for armoring as slope reclamation progresses in each Phase will remain unchanged. As previously stated, DRMS could review sound arguments to modify those requirements on a site-specific basis, but there will need to be sufficient hydrologic/engineering justification provided to do so. Please modify the mining and reclamation plans and maps as needed to depict the appropriate berm widths for the lateral berm, provide the appropriate designs, and show the locations for the necessary armoring on the Reclamation Plan Map. Costs for all pitside/berm protection will also need to be included in Exhibit L. The armoring of the south bank for Phase 2 has been added to the Reclamation Maps. It is not necessary to reflect the added cost since Phase 2 is not included in the working bond calculation show in Exhibit L EXHIBIT F - Reclamation Plan Map (Rule 6.4.6): Please show the locations of proposed pit armoring in Phases 1 and 2, as well as the lateral berm between phases, as described above. The Reclamation Maps have been revised to show the locations of proposed pit armoring. In Phases 1 and 2, armoring is shown along the west side of those phases. Along the lateral berm between Phases 1 and 2, the downslope armoring is shown on the south bank of Phase 2. EXHIBIT G -Water Information Rule 6.4.7 DRMS acknowledges the permittee's commitment to conducting the required baseline well testing for quality and yield prior to installing slurry walls, dewatering, or exposing groundwater within 200 feet of the well, if the well owner allows it. DRMS also accepts the proposed plan provided with the following clarification. If the permittee wishes to place a limit on the amount of time the well owner is given to respond before considering a lack of response a denial of access, the minimum time allowed for a response shall be no less than 30 days, and this limitation shall be clearly stated in the letter sent requesting access to conduct the well testing. The access letters should also be sent by certified mail or another trackable method so that delivery to the well owner can be verified. As previously stated, the McPeek well will need to be tested prior to the commencement of mining in Phase IA.