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4...A0 t <br />DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />Scott Palmer, PE, Project Engineer <br />Deere & Ault Consultants, Inc. <br />600 S. Airport Road, Building A, Suite 205 <br />Longmont, CO 80503 <br />Re: Walker Reservoir South Leak Test (WDID 0203358) <br />SE'/, Section 36, T1 N, R67W, 6 P.M. <br />Water Division 1, Water District 2 <br />Please call me if you have any questions. <br />WalkerSouthPitLinePerfomlanceOK .doc <br />CC: Scott Edgar, Water Commissioner <br />Joanna Williams, Denver SEO <br />Sincerely, <br />David L. Nettles, P.E. <br />Acting Division Engineer <br />Bill Ritter, Jr. <br />Governor <br />Water Division 1 • Greeley <br />810 9th Street, Suite 200 • Greeley, CO 80631 • Phone: 970- 352 -8712 • Fax: 970 -392 -1816 <br />Mike King Executive Director <br />Dick Wolfe, P.E. <br />Director/State Engineer <br />David L. Nettles, P.E. <br />Acting Division Engineer <br />Exhibit 1 - Baseline Resource SEO Slurry Wall Approval <br />July 2, 2010 <br />Dear Scott <br />The purpose of this letter is to approve the lining of the above referenced partially mined gravel pit area <br />enclosed by a slurry wall. <br />You provided the results of the 90 day test under a cover memorandum dated June 29, 2010 for the test <br />period of March 8 through June 7, 2010. A site inspection was also performed by DWR personnel on June <br />17, 2010. The estimated slurry wall enclosed area inflows from precipitation and groundwater during the <br />test indicate that this pit has been lined to the performance standard referenced in the August 1999 <br />State Engineer Guidelines for Lining Criteria for Gravel Pits. Meeting the performance standard <br />requires that all water inflows and outflows for this slurry wall enclosed area must be accounted <br />for on a weekly basis. <br />Although this site is not currently being used for water storage, prior to ANY use of this site under the <br />decreed right referenced above (or any other decree), the owner or operator will need to coordinate with <br />the District 2 Water Commissioner, currently Scott Edgar, to provide him with the water accounting <br />required pursuant to the decree in 1997CW272 and 1997CW392 <br />