2020-05-08_PERMIT FILE - M2020007

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ENVIRONMENT, INC. PAGE 4 L.G. EVERIST, INC. - RAGSDALE RESERVOIR ADEQUACY RESPONSE 01 MAY 6, 2020 Mining in Phases 1, 2, 3, 4, 5 & 6 will be mined after the slurry walls are completed around them. But it will be necessary to pump out any water captured during lining and during the time until the liner certification is complete. The losses associated with this action will be covered in the Temporary Substitute Supply Plan ( TEMPORARY SUBSTITUTE SUPPLY PLAN ) developed for the mine. Stages 1A, 2A, 4A, 413, and 5A will be dewatered during mining so they can be mined dry. Dewatering will have to continue in some capacity until mining ends. The side slopes in these backfill phases will be mined 3h to 1v so they do not need to be graded if mining ends prematurely. The pumps would then be removed and the mined area would fill with water and remain that way till backfilling is complete. The evaporative losses from these ponds will be accounted for in the Temporary Substitute Supply Plan until backfilling is done. With respect to the additional figure/table referred to above detailing the utilities in the areas to be mined, please acknowl- edge that DRMS will require a TECHNICAL REVISION 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 . Thank you for the reminder. L.G. Everist, Inc. understands that any changes to the approved plan resulting from moving utilities and changing the reconfiguration of the final reclamation plan will require a Technical Revision. EXHIBIT E - Reclamation Plan (Rule 6 .4.5) : The first paragraph in the "reclamation plan for reservoir areas" is duplicated - please edit as needed. I have corrected this and enclosed a revise Exhibit E- Reclamation Plan for the file. 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. No inlet/outlet structure will be built on this facility. It is not L.G. Everist's responsibility to bridge the gap between the permit area and the river's edge. The land owner does not desire inlet/outlet structures at this time, thereby alleviating DRMS's responsibility. After mine reclamation and release, if the landowners want to install inlet/outlet structures, they are ultimately responsible for adding them if they feel they are needed in the future. The permit boundary set-back from the river corridor was done because the landowner desires access to the South Platte River without the constraints of MSHA. This gives the landowner and his tenant farmer, access to unmined areas and on-going irrigation facilities and operations that are connected with the entire 700 acres on both the west and east sides of Highway 85. As a precaution, and following common industry practice, the permit boundary and mine limits were offset from the river bank at great distance to minimize impacts to the riparian corridor and possible inundation of floodwaters. With this extensive setback, the inlet/outlet