2020-03-27_PERMIT FILE - M2020007

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Mr. O'Brian—Environment Inc. March 27 Page 2 of 6 EXHIBIT C -Pre-mining and Mining Plan Map(s)of Affected Lands(Rule 6.4.3): Exhibit C- Surface owners Darrell McCrumb Trust and Carol Chavez Living Trust are shown on map(far SE corner,East Side),but not listed in text on map, or in Exhibit O. What is the"IR"line in the NW corner of Phase 2 and in Phase 4A? Exhibit C 1- As a general rule,the"snapshot"presentation utilized for the mining plan and bond calculation utilized in this application is not appropriate. DBMS will need to see the proposed mining plan for the site as it will be ultimately executed for all phases. Locations of topsoil and overburden piles need to be shown on mining plan map. Slurry wall for Phase 3, and the slurry walls located in the eastern part of the permit are not shown. There is no description in the legend for the hatch pattern shown in Phase 1 A/2A Because so much of the mining plan and configuration of the final reclamation plan depends on the configuration of the existing utilities, and which ones will be removed/relocated as mining and reclamation progresses;please provide a separate figure with table that highlights the utilities within the areas to be mined,a description of what they are,who owns them, and how they will be dealt with. It would probably be most useful to break this out by mining phase. The heavy hatched line in the south end of Phase 1 is inconsistent between the mining and reclamation plan maps—please edit as needed. EXHIBIT D-Mining Plan(Rule 6.4.4): It is not explicitly stated in the application,but DBMS assumes based on the information provided that Phases 1,2,3,4,5 and 6 will have slurry walls installed prior to dewatering/groundwater exposure, and that Phases IA,2A,4A,4B,and 5A will be wet mined. Please confirm if this is correct. With respect to the additional figure/table referred to above detailing the utilities in the areas to be mined,please acknowledge that DRMS will require a TR to be submitted to modify the mining plan/reclamation plans as required if changes are made to how existing utilities are handled during the mining process. EXHIBIT E-Reclamation Plan(Rule 6.4.5): The first paragraph in the"reclamation plan for reservoir areas" is duplicated—please edit as needed. Inlet/Outlet structures to allow floodwaters to enter and exit Phase 1 and 2 without damaging slurry wall liners will need to be designed and installed. Please provide the appropriate designs and show the locations for the structures on the Reclamation Plan Map. Costs for this will also need to be included in Exhibit L.