2023-02-02_PERMIT FILE - M2022013 (12)

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prevent any negative impacts to the hydrologic balance of the two rivers. Raptor Materials First Adequacy Response We are not required to `Prevent,' but rather `Minimize' impacts. We believe the submittal conservation measures and provisions attain this standard. Rule 3.1.6 "Disturbances to the prevailing hydrologic balance of the affected land and of the surrounding area and to the quantity or quality of water in surface and groundwater systems both during and after the mining operation and during reclamation shall be minimized by measures, " Considerable efforts are made to control storm flows, including the use of grassed waterways. Some rilling will occur on cut slopes, but the sediment is inbound. A minor 6-inch furrow above cut slopes will create a 1-foot swale that could minimize such rilling, especially valuable on reclaimed slopes above the final estimated water level of the basins. The stormwater management plan referenced in Exhibit I & J will address broader water management covering the material processing area and any piles of soil or inert fill constructed external to the excavations. Division Second Adequacy Comment The Division agrees that the word "minimize"is appropriate, rather than `prevent. " However, RMneeds to revise Exhibit G and re-submit it. Exhibit G should include the statements requested in the original adequacy,letter (using the word `minimize" as noted above). Raptor Materials Second Adequacy Response Raptor has revised Exhibit G as requested (page 1, Footnotes 1 and 2). 44) Describe the physical dewatering system and provide a description of the operation of this system. A copy of the discharge permit application provided to CDH is included with this submittal. It will indicate information about the pump capacity and discharge rates. Exhibit D: Extraction Plan devoted a section to it, and AWES devoted a report to it, as provided with the other attachments in this reply. Here's what the permit application stated, followed by a blow-up of the feature visible near the #10 451 Page Correspondence to the Colorado Office of Mined Land Reclamation —Reply to Rob Zuber,EPS—Adequacy Letters of 24 June and 5 August 2022;in the matter of the Two Rivers Sand,Gravel and Reservoir Project—M2022-013.