2022-12-09_PERMIT FILE - M2022001 (2)

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CIVII RFS1)URCFS, LL, RECI EYED ENGINEERS & PLANNERS December 1st,2022 DEC 0 9 2022 Mr. Peter Hays DIVISION OF RECLAMATION Division of Reclamation, Mining,and Safety MINING AND SAFETY 1313 Sherman Street, Room 215 Denver, Colorado 80203 RE: Red Tierra Equities,L.L.C.,Section 20 Mine,File No. M-2022.001, 112c Permit Application Adequacy Review 6 Response Dear Mr. Hays: This letter addresses the Adequacy Review letter dated November 20th, 2022 regarding the Section 20 Gravel Mine 112 Construction Materials Reclamation Permit Application Package. Responses to your comments follow in bold: Exhibit C-Pre-Mining and Mining Plan Maps-Rule 6.4.3 1. In response to Item#1, the Applicant stated a recharge pond will be utilized to mitigate the groundwater shadow effect and to receive water from the underdrains and or dewatering wells. a. Please provide an Operations and Maintenance(0&M)plan for the recharge pond to prevent siltation of the pond. A Operations and Maintenance Plan has been included below the infiltration pond section included on Map C-5. b. Please provide a demonstration the recharge pond is sized appropriately to receive and dissipate the anticipated 6.5 CFS inflow at final build out of the mitigation system.The calculation sheet used to size the infiltration pond has been included. The method used is described in Massman,et al,2003,"A Manual For Sizing Infiltration Ponds." c. Please provide a cross-section(s)of the recharge pond and update the Exhibit C-5 accordingly. Cross-section has been included on Exhibit C-5. Exhibit R-Proof of Filing with County Clerk and Recorder-6.4.18 2. Please provide an affidavit or receipt indicating the date on which the revised application information required to address this adequacy letter was placed with the Weld County Clerk and Recorder for public review,pursuant to Subparagraph 1.6.2(1)(c). Groundwater Model. The copy of the email sent to Weld County has been included with this letter. 3. In response to Item#5, the Applicant stated the option to run the proposed pipeline from south to north along the midsection line to the infiltration pond located north of the site to keep the infrastructure on Section 20 is discussed in the Recharge Option in the Groundwater Model Report. The copy of the Groundwater Model report received by the Division on November 7, 2022 was the same report received on October 27, 2022. Please provide a revised copy of the groundwater model report incorporating the statements and commitments made by the Applicant in the adequacy review 5 response letter.The Groundwater Model Report has been updated to directly address the infiltration pond model run. The recommendations from the groundwater model have not changed. Red Tierra has committed to installing the infiltration pond by including it in the exhibits and it will be included in the bonding calculation. B30B C❑L❑RADO BLVD • SUITE 200 • FIRESTONE, COLORAD❑ 80504 • PHONE: 303.833.1 41 6 • FAX: 303.833.2850