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DEPARTMENT OF NATURAL RESOURCES <br />DMSION OF WATER RESOURCES <br />&eraooM <br />covemm <br />� <br />g <br />8xecutive Director <br />Dick Wolfe, P.E. <br />December 16, 2011 areewr/stateEnoteer <br />David L. Nettles, P.E. <br />Division Engineer <br />DEERE & AULT CONSULTANTS, INC. <br />DEREK H. FOSTER, P.E. <br />600 S. AIRPORT ROAD, BUILDING A, SUITE 205 <br />LONGMONT, CO 80503 <br />RE: SLURRY WALL LINER APPROVAL <br />KIRBY- DERSHAM RESERVOIR, WDID 0203386 <br />PARKER - DERSHAM RESOURCE PIT, DRMS M -2006 -003, WDID 0203026 <br />13MEUNE RE80U14CE PIT, DRUS M- 1097 -058, WDID 02030117 <br />E% SE' /4 836- TIN -1167W, WATER DIVISION 1, WATER DISTRICT 2 <br />Dear Derek: <br />The purpose of this letter is to approve the lining of the Kirby - Dersham Slurry Wall. The slurry wail is <br />generally located in the E% of the SE/. of Section 36, Township 1 North, Range 67 West, abuts the <br />adjacent Robert Walker Reservoir (WDID 0203358) and is a part of the Parker- Dersham Resource <br />and Baseline Resource Gravel Pits The slurry wall liner test commenced May 22, 2011 and <br />concluded on September 8, 2011. A site inspection was performed by our office on September 8, <br />2011 to review site conditions and the leak test plan. <br />Your report dated December 12, 2011 provides the liner summary and 90 -day leak test result. The <br />test data provided Indicates that the oil has been lined to the design stoglarsd referenced in the <br />August 1999 State Engineer Gunder for Lining Criteria for Gravel Pitts (1999 SEO Guidelines). <br />Meeting the design atarndard requires that all water Inflows and outflows for the finer perimeter <br />enclosed area must be accounted for on a monthly basis. <br />With this liner approval, the Kirby-D,ersham Reservoir may be used to store water in acoardance wifh <br />the 1999 SEO Guidelines. Prior to ANY use of this site, the owner or operator will need to coordinate <br />with the District 2 Water Commissioner, to review operations and accounting. <br />Please contact me at the number below If you have any questions. <br />Sincerely, <br />4gn—aftK M. Homand <br />Water Aesource Engineer <br />ec: BIN Schneider, Acting Dlstrrct 2 Water Conlmissbner <br />Joanna Wiliam, Denver SEO <br />WDID File (0203017,0203M, 0203386) <br />Water Division T • Greeley <br />810"Street, Suite 200 • Greeley, CO 80631 • Phan: 970 - 352 -8712 • Fax 970- 392 -1816 <br />www.water.state.co.us <br />