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6. COLORADO <br />Division of Water Resources <br />Department of Natural Resources <br />September 18, 2018 <br />HARRY KARAKATSANIS <br />L. G. EVERIST, INC. <br />7321 E. 88TH AVENUE, SUITE 200 <br />HENDERSON, CO 80503 <br />TRANSMISSION VIA EMAIL: hkarakatsanislgeverist.com <br />RE: CLAY LINER APPROVAL <br />CARBON VALLEY RESERVOIR (WDID 0504095) <br />CARBON VALLEY SAND AND GRAVEL PIT, DRMS NO. M-2001-017 (WDID 0503003) <br />E1 /2 OF THE NW1 /4 OF SECTION 6, T2N, R67W, SIXTH P.M. <br />WATER DIVISION 1, WATER DISTRICT 5 <br />Dear Mr. Karakatsanis: <br />John W. Hickenlooper <br />Governor <br />Robert Randall <br />Executive Director <br />Kevin G. Rein. P.E. <br />Director/State Engineer <br />The purpose of this letter is to approve the lining of the Carbon Valley Reservoir. Carbon Valley Reservoir is <br />primarily located in the E1 /2 of the NW1 /4 of Section 6, Township 2 North, Range 67 West of the 6t' P.M., and <br />was mined under Carbon Valley Sand and Gravel Pit (formerly Lohmann Pit) DRMS M-2002-104 (WDID 0503003). <br />Carbon Valley Reservoir was lined with a clay liner. This clay liner leak test commenced June 11, 2018 and <br />concluded September 11, 2018. Site inspection was performed by our office on August 16, 2018 to review site <br />conditions and the leak test plan. <br />Your report dated September 12, 2018 provides the liner summary and leak test results. The test data provided <br />indicates that the reservoir has been lined to the design standard referenced in the August 1999 State Engineer <br />Guidelines for Lining Criteria for Gravel Pits (1999 SEO Guidelines). Meeting the design standard requires that <br />during reservoir operations all water inflows and outflows for the liner perimeter enclosed area be <br />accounted for on a monthly basis. <br />With this liner approval, the Carbon Valley Reservoir is now classified as a lined reservoir in accordance with the <br />1999 SEO Guidelines. Water shall not be impounded in the reservoir except pursuant to lawful diversions allowed <br />by statute or decree. At all other times, all inflow of water into the reservoir from any source, including <br />precipitation and ground water inflows shall be removed to prevent illegal storage of water. Prior to ANY use of <br />this site, the owner or operator will need to coordinate with Shera Sumerford, District 5 Water Commissioner, to <br />review operations, measurement structures, stage -storage curves, and accounting. <br />Please contact me at the number below if you have any questions. <br />Sincerely, <br />4kkaay'c"� <br />loana Comaniciu, P.E. <br />Water Resource Engineer <br />Ec: Shera Sumerford, District 5 Water Commissioner, District 5 (Shera.SumerfordC�state.co.us) <br />Louis Flink, Diversion Records Coordinator (Louis.flink@state.co.usi <br />WDID File (0504095, 0503003) <br />OF COQ <br />Office of the State Engineer <br />1313 Sherman Street, Room 821. Denver. CO 80203 P 303.866.3581 <br />ne Q <br />www. water.state.co.us <br />