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' COLORADO <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 /> bsilienberp,@brierleyassociates.com <br /> RE: SLURRY WALL LINER APPROVAL <br /> SOUTH SLURRY WALL-CELL 3 (WDID 0503325) <br /> ' HOKESTRA PIT, DRMS M-1980-149 (WDID 0503006) <br /> NW1/4 AND NE1/4 OF SECTION 2, T2N, R68W, WATER DIVISION 1, WATER DISTRICT 5 <br /> Dear Mr. Siljenberg: <br /> The purpose of this letter is to approve the lining of the South Slurry Wall Reservoir (Cell 3). The South Slurry <br /> Wall Reservoir is located primarily in the SW1/4 of the NE1/4 of Section 2, with parts in the SE1/4 of the <br /> NW1/4 and the NW1/4 of the NE1/4 of Section 2, all in Township 2 North, Range 68 West of the 6th P.M. It is <br /> a part of the Hokestra gravel pit (DRMS M-1980-149). This slurry wall liner leak test commenced May 20, 2014 <br /> and concluded on August 18, 2014. Site inspection was performed by our office on May 28, 2014 to review <br /> 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 design standard referenced in the August 1999 <br /> State Engineer Guidelines for Lining Criteria for Gravel Pits (1999 SEO Guidelines). Meeting the design <br /> ' standard requires that during reservoir operations all water inflows and outflows for the liner perimeter <br /> enclosed area be accounted for on a monthly basis. <br /> With this liner approval, the North Slurry Wall Reservoir is now classified as a lined reservoir in accordance <br /> ' with the 1999 SEO Guidelines. Water shall not be impounded in the reservoir except pursuant to lawful <br /> diversions allowed by statute or decree. At all other times, all inflow of water into the reservoir from any <br /> source, including precipitation and ground water inflows shall be removed to prevent illegal storage of water. <br /> Prior to ANY use of this site, the owner or operator will need to coordinate with Shera Sumerford, District 5 <br /> Water Commissioner, to 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 /> ' Tracy Kos ff, P.E. <br /> Water Resource Engineer <br /> ec: Shera Sumerford, District 5 Water Commissioner (Shera.Sumerford@state.co.us) <br /> Louis Rink, Diversion Records Coordinator (Louis.f[ink@state.co.us) <br /> WDID File (0503325 Et 0503006) <br /> of cot <br /> ll <br /> r�T/ Yt:tl 9Q� <br /> 1313 Sherman Street, Room 821, Denver,CO 80203 P 303.866.3581 F 303.866.3585 www.water.state.Co.us ( �Nr of <br />