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AVCOLORADO ' <br /> Division of Water Resources <br /> � Department of Natural Resources <br /> 1313 Sherman Street, Room 821 , <br /> Denver, CO 80203 <br /> October 7, 2014 ' <br /> Hall-Irwin Corporation <br /> 301 Centennial Drive ' <br /> Milliken, CO 80543 <br /> c/o Benny Siljenberg (Brierley Associates) <br /> bsi ljen ber,@brierleyassociates.com <br /> RE: SLURRY WALL LINER APPROVAL <br /> NORTH SLURRY WALL-CELL 4 (WDID 0503326) <br /> HOKESTRA PIT, DRMS M-1980-149 (WDID 0503006) ' <br /> SE1/4 of SW1/4 OF SECTION 35, T3N, R68W AND NE1/4 of NW1/4 OF SECTION 2, T2N, R68W, <br /> WATER DIVISION 1, WATER DISTRICT 5 <br /> Dear Mr. Siljenberg: <br /> The purpose of this letter is to approve the lining of the North Slurry Wall Reservoir (Cell 4). The North Slurry <br /> Wall Reservoir is primarily located in the NE1/4 of the NW1/4 of Section 2, Township 2 North, Range 68 West <br /> of the 61h P.M. with a small area in the SE1/4 of the SW1/4 of Section 35, Township 3 North, Range 68 West. <br /> It is a part of the Hokestra gravel pit (DRMS M-1980 149). This slurry wall liner leak test commenced May 20, <br /> 2014 and concluded on August 18, 2014. Site inspection was performed by our office on May 28, 2014 to <br /> review site conditions and the leak test plan. ' <br /> Your report dated September 29, 2014 provides the liner summary and leak test result. The test data <br /> provided indicates that the reservoir has been lined to the performance standard referenced in the August <br /> 1999 State Engineer Guidelines for Lining Criteria for Gravel Pits (1999 SEO Guidelines). Meeting the t <br /> performance standard requires that during reservoir operations all water inflows and outflows for the <br /> liner perimeter enclosed area be accounted for on a weekly basis. <br /> With this liner approval, the North Slurry Wall Reservoir (Cell 4) is now classified as a lined reservoir in ' <br /> accordance with the 1999 SEO Guidelines. Water shall not be impounded in the reservoir except pursuant to <br /> lawful diversions allowed by statute or decree. At all other times, all inflow of water into the reservoir from <br /> any source, including precipitation and ground water inflows shall be removed to prevent illegal storage of <br /> water. Prior to ANY use of this site, the owner or operator will need to coordinate with Shera Sumerford, <br /> District 5 Water Commissioner, to review operations, measurement structures, stage-storage curves, and <br /> accounting. <br /> Please contact me at the number below if you have any questions. ' <br /> Sincerely, Y <br /> �_!,1YyV � <br /> Tracy Kosloff P.E. <br /> Water Resource Engineer <br /> ec: Shera Sumerford, District 5 Water Commissioner (Shera.Sumerford@state.co.us) <br /> Louis Flink, Diversion Records Coordinator (Louis.ftink@state.co.us) <br /> WDID File (0503326 Et 0503006) ' <br /> OF_COS� <br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 F 303.866.3585 www.water.state.co.us I ti _tZ� J�olj <br /> .18 76 <br />