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• - COLORADO Division of Water Resources Department of Natural Resources 1313 Sherman Street, Room 821 Denver, CO 80203 REC1="" '^ SEP 0 3 2015 DIVISION OF RECLAMATION MINING AND SAFETY Response to Reclamation Permit Amendment Application Consideration DATE: September 3, 2015 TO: Michael A. Cunningham, Environmental Protection Specialist CC: Division 1 Office, District 6 Water Commissioner FROM: loana Comaniciu, P.E. RE: Goose Haven Reservoir #2 Complex Expansion, File No. Operator: City of Lafayette Contact: Peter Wayland, (303) 443-9521 Sections 15, 21, and 22, Twp 1 North, Rng 69 West, 6th M-2010-071 P.M., Boulder County COMMENTS: City of Lafayette requested an amendment to the application for the Goose Haven Reservoir #2 Complex Expansion, Permit no. M2010-071. The purpose of this amendment is to add a new cell to the mining area designated as Cell #4 (Reservoir #4) and change the reclamation plan of the reservoirs from slurry wall to compacted clay liner. This change in end use will involve creating up to 2 reservoirs covering 56 acres. The proposed operation will continue to consume ground water through evaporation, dust control, reclamation, water removed with the mined product, and dewatering. The Goose Haven Reservoir #2 Complex Expansion is included in a Substitute Water Supply Plan, which covered depletions caused by gravel mining operations at the site through December 31, 2014. As noted in the SWSP approval dated January 9, 2013, a gravel pit well permit must be obtained for the current use and exposed surface area at the site in accordance with 537-90- 137(2) and (11), C.R.S. Applicant submitted well permit application (#3655374) and this application is pending evaluation. In addition, a renewal request of the SWSP was submitted to this office on August 4, 2014 and this plan is pending additional information from the Applicant's water consultant. So long as the amended is operated in accordance with an approved SWSP or approved plan for augmentation, this office has no objection to the request. If stormwater runoff is intercepted by this mining operation and is not diverted or captured in priority, it must be released to the stream system within 72 hours, which may require a discharge permit from CDPHE-WQCD. Otherwise, the operator will need to make replacements for evaporation. The applicant may contact the State Engineer's Office with any questions. 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 F 303.866.3585 www. water. state. co. us