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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 /> August 4, 2015
<br /> DEREK FOSTER
<br /> DEER£ It AULT CONSULTANTS, INC.
<br /> 600 S. AIRPORT ROAD, BUILDING A, SUITE 205
<br /> LONGMONT, CO 80503
<br /> TRANSMISSION VIA EMAIL: Derek.Foster@deereautt.com
<br /> RE: SLURRY WALL LINER APPROVAL
<br /> STAGECOACH STOP RESERVOIR (WDID 0203914)
<br /> STAGECOACH STOP PIT, DRMS M-1983-067 (WDID 0203015)
<br /> WORTHING PIT, DRMS M-M1977-526 (WDID 0203061)
<br /> SECTIONS 26 AND 35, T1 S, R67W
<br /> WATER DIVISION 1, WATER DISTRICT 2
<br /> Dear Mr. Foster:
<br /> The purpose of this letter is to approve the lining of the Stagecoach Stop Reservoir. The Stagecoach Stop Reservoir
<br /> is primarily located in the SW1/2 of the SW1/4 of Section 26 and the W1/2 of the NW1/4 of Section 35, all in
<br /> Township 1 South, Range 67 West of the 6`" P.M., and is part of the Stagecoach Stop gravel pit (DRMS M-1983.067)
<br /> and Worthing gravel pit (DRMS M-1977-526). The slurry wall was provisional approved on August 7, 2012 while
<br /> active mining continued to occur within the liner boundary. The mining is complete. In order for the liner to be
<br /> approved for water storage the operator was required to perform a final modified 30-day leak test. The final
<br /> modified slurry watt liner leak test commenced June 9, 2015 and concluded on July 16, 2015, Site inspection was
<br /> performed by our office on June 24, 2015 to review site conditions and the leak test plan.
<br /> Your report dated August 3, 2015 provides the liner summary and leak test result. The test data provided indicates
<br /> that the reservoir has been tined to the design standard referenced in the August 1999 State Engineer Guidelines
<br /> for Lining Criteria for Gravel Pits (1999 SEC) Guidelines), Meeting the design standard requires that during
<br /> reservoir operations all water inflows and outflows for the liner perimeter enclosed area be accounted for on
<br /> a monthly basis.
<br /> With this liner approval, the Stagecoach Stop 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 William Schneider, District 2 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 /> 41kiza.."04
<br /> loana Comaniciu, P.E.
<br /> Water Resource Engineer
<br /> ec: William Schneider, District 2 Water Commissioner (Willi am.Schneider@state.co.us)
<br /> Louis Ftink, Diversion Records Coordinator (Louis.flink@state.co.us)
<br /> WDID File (0203914, 0203015 it 0203061)
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<br /> 1313 Sherman Street, Room 821, Denver, CO 80203 P 303,866,3581 F 303,866,3585 www.water.5cate.co.u,, r
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