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DNR COLORADO <br /> CO -r• Division of Water Resources <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 821 <br /> Denver,CO 80203 <br /> December 1, 2015 <br /> DEREK FOSTER <br /> DEERE &AULT CONSULTANTS, INC. <br /> 600 S. AIRPORT ROAD, BUILDING A, SUITE 205 <br /> LONGMONT, CO 80503 <br /> TRANSMISSION VIA EMAIL: Derek.Foster@deereault.com <br /> RE: SLURRY WALL LINER APPROVAL <br /> GREELEY 35Th AVENUE(WEST CELL RESERVOIR) (WDID 0303844) <br /> GREELEY 35 AVENUE PIT, DRMS M-1977-036 (WDID 0303022) <br /> NE1/4 SECTION 34 AND NW1/4 SECTION 35,T6N, R66W <br /> WATER DIVISION 1, WATER DISTRICT 3 <br /> Dear Mr. Foster: <br /> The purpose of this letter is to approve the lining of the Greeley 35th Avenue (West Cell Reservoir).The West <br /> Cell Reservoir is primarily located in the E1/2 of the NE1/4 OF Section 34 and the NW1/4 of Section 35, <br /> Township 6 North, Range 66 West of the 6th P.M., and is part of the Greeley 35th Avenue gravel pit (DRMS M- <br /> 1977-036). West Cell Reservoir was lined with a soil bentonite slurry wall. The slurry wall leak test <br /> commenced August 7, 2015 and concluded on November 6, 2015. Site inspection was performed by our office <br /> on August 27, 2015 to review site conditions and the teak test plan. <br /> Your report dated November 11, 2015 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 SE0 Guidelines). Meeting the <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 West Cell Reservoir of the Greeley 35th Avenue Pit is now classified as a lined <br /> reservoir in accordance with the 1999 SE0 Guidelines. Water shall not be impounded in the reservoir except <br /> pursuant to lawful diversions allowed by statute or decree. At all other times, all inflow of water into the <br /> reservoir from any source, including precipitation and ground water inflows shall be removed to prevent <br /> illegal storage of water. Prior to ANY use of this site, the owner or operator will need to coordinate with <br /> Mark Simpson, District 3 Water Commissioner, to review operations, measurement structures, stage-storage <br /> curves, and accounting. <br /> Please contact me at the number below if you have any questions. <br /> Sincerely, <br /> adthitaill64 <br /> loana Comaniciu, P.E. <br /> Water Resource Engineer <br /> ec: Mark Simpson, District 3 Water Commissioner (Mark.Simpson@state.co.us) <br /> Louis Flink, Diversion Records Coordinator (Louis.flink@state.co.us) <br /> WDID File (0303844 &0303022) <br /> (t51 t V <br /> 1313 Sherman Street,Room 821, Denver,CO 80203 P 303.866.3581 F 303.866.3585 www.water.state.co.us °k � h <br /> 7_87 <br />