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CAV-JZsion LORADO <br />of Water Resources <br />Department of Natural Resources <br />1313 Sherman Street, Room 821 <br />Denver, CO 80203 <br />f <br />December 17, 2014 <br />-T-8-:-T CONSULTING INC. <br />J.C. YORK, P.E. <br />305 DENVER AVENUE, SUITE D <br />FORT LUPTON, CO 80621 <br />TRANSMISSION VIA EMAIL: icyork @i-tconsulting.com <br />RE: `SLURRY WALL REPAIR LINER APPROVAL <br />PERRY PIT EAST RESERVOIR (WDID 0203503) <br />NEI /4 S25- TIN -R67W AND NW1 /4 S30- TIN -R66W, <br />WATER DIVISION 1, WATER DISTRICT 2 <br />Dear Mr. York: <br />The purpose of this letter is to approve the lining of the Perry Pit East Reservoir. This reservoir is located in the <br />NE1 /4 of the NE1 /4 of Section 25, Township 1 North, Range 67 West of the 6h P.M. and the NW1 /4 of the NW1 /4 of <br />Section 30, Township 1 North, Range 66 West of the 6th P.M. and is a part of the Perry Pit (DRMS M- 1990 -098). The <br />reservoir was previously tested and approved on June 9, 2006 as meeting the design standard. During the <br />September 2013 flooding there were two breached areas discovered at the site (one on the south side and one <br />on the west side). The slurry wall liner was repaired at the location of the two breached areas and tied back <br />into the existing slurry wall liner (approximately 15 -20 feet on either side of the breach). The purpose of this <br />test was to analyze the liner repair and re -verify the previously approved liner once again met the design standard. <br />The liner test commenced on August 22, 2014 and concluded on December 1, 2014. A site inspection was <br />performed by our office on August 28, 2014 to review site conditions and preliminary leak test data. <br />Your report dated December 3, 2014 provides the liner summary and the 90 -day leak test result. The test data <br />provided indicates that the reservoir has been lined to the design standard referenced in the August 1999 State <br />Engineer Guidelines for Lining Criteria for Gravel Pits (1999 SEO Guidelines). Meeting the design standard <br />requires that during reservoir operations all water inflows and outflows for the liner perimeter enclosed area <br />be accounted for on a monthly basis. <br />With this liner approval, the Perry Pit East Reservoir is once again classified as a lined reservoir in accordance with <br />the 1999 SEO Guidelines. Water shall not be impounded in the reservoir except pursuant to lawful diversions <br />allowed 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, and accounting. <br />Please contact me at the number below if you have any questions. <br />*S'ncerCely, <br />maniciu, P.E. <br />Water Resource Engineer <br />ec: William Schneider, District 2 Water Commissioner (william.schneider @state.co.us) <br />WDID File (0203503) <br />OF' -C <br />I N� <br />1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 F 303.866.3585 www.water.state.co.us <br />* 1876 <br />