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C O L O R A D O John W. Hickenlooper <br /> Governor <br /> Division of Water Resources <br /> ., Robert Randall <br /> Executive Director <br /> Kevin G. Rein, P.E. <br /> Director/State Engineer <br /> September 18, 2018 <br /> HARRY KARAKATSANIS <br /> L. G. EVERIST, INC. <br /> 7321 E. 88T" AVENUE, SUITE 200 <br /> HENDERSON, CO 80503 <br /> TRANSMISSION VIA EMAIL: hkarakatsanis@lQeverist.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 /> 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 6th 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 monthlV 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 /> 14 r" <br /> loana Comaniciu, P.E. <br /> Water Resource Engineer <br /> Ec: Shera Sumerford, District 5 Water Commissioner, District 5 (Shera.Sumerford@state.co.us) <br /> Louis Flink, Diversion Records Coordinator (Louis.flink@state.co.us) <br /> WDID File (0504095, 0503003) <br /> Office of the State Engineer <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 <br /> www.water.state.co.us y <br /> H7h . <br />