2021-06-17_PERMIT FILE - M2001046 (4)

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Page 4 Mr. Eric Scott June 4th,2021 discussed in Exhibit G(or on the provided existing structures map), and provide all available construction information for those wells-especially S.W.L., total depths, and screened intervals if possible. If this information is not available, the operator should contact well owners and offer to measure existing wells and water levels to document pre-mining conditions at operator's expense.The eight permitted alluvial wells within 600'of the permit area have been added to the Structures Map as well as available construction information for each well(See Attached Structures Map). •Provide a GW contour map for the site based on all available current pre-mining water level information provided. See attached average groundwater level contour map. •Identify the "baseline"water level elevations for each MW that will be utilized to compare to the two foot deviation proposed in the provided monitoring plan to determine if DRMS notification and mitigation measures will be implemented. The attached monitoring well spreadsheet includes minimum and maximum water levels for monitoring wells 1.8 which will be utilized as the baseline water level elevations. •30 days to notify DRMS and commence investigation of a possible GW issue as stated in the provided monitoring plan is too long. The operator will be required to notify DRMS of a possible issue (monitoring trigger levels exceeded, complaint, etc.) within 7 days of the operator's knowledge of the issue. The operator will also be required to reportrinvestigate complaints from well owners outside 600' from the permit boundary—please acknowledge. RMCC will notify DRMS within 7 days of the operator's knowledge of a possible issue. • The operator will need to provide GW level and any GW analytical data collected with the annual report for the site—please acknowledge. RMCC will provide all groundwater data collected with the annual report. EXHIBIT L-Reclamation Costs(Rule 6.4.12): All information necessary to calculate the costs of reclamation must be submitted and broken down into the various major phases of reclamation. You must provide sufficient information to calculate the cost of reclamation that would be incurred by the state. The reclamation estimate provided is missing several significant items: •Basis for slurry wall unit costs for the northern slurry wall utilized in the provided estimate—if RMCC already has awarded contracts for this work that information will be sufficient, otherwise additional information will be needed. The basis for the slurry wall unit cost is the Morton Stage 3 slurry wall.The Stage 3 cost estimate is attached. DRMS acknowledges the statements provided that no groundwater will be exposed prior to approval of slurry walls other than the freshwater and siltation ponds, and that the bond for the southern"slurry wall will be provided in the future through the revision process prior to commencement of installation of that slurry wall. • Cost to remove"batch plant"shown on mining plan map. This information will need to correlate with the configuration of the batch plant provided in the mining plan. RMCC may decide to have both a portable concrete batch plant and a portable asphalt batch plant at the site in the future, so both plants have been included in the updated Exhibit L. The concrete batch plant will utilize portable equipment. It will have a 30'x 50'concrete pad foundation.The reclamation cost has been updated to reflect the cost to remove the foundation and to seed and mulch the surrounding 2 acres.The asphalt batch plant will also utilize portable equipment which will sit on concrete footings.The reclamation cost has been updated to reflect the cost of removing the concrete footings and to seed and mulch the surrounding 4 acres. •Listing of equipment to be utilized to complete needed tasks(scraper, dozer, grader, water truck, etc). DRMS will verify the required bond when the information requested is provided and all remaining adequacy