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WATER DIVISION ONE <br />OFFICE OF THE STATE ENGINEER <br />Division of Water Resources <br />Department of Natural Resources <br />810 a Street, Suite 200 <br />Greeley, Colorado 80631 <br />Phone(970)352-8712 <br />Fax (970) 392-1816 <br />www.water.state.co.us <br />August 2, 2006 <br />Colby Hayden, PE, Principal <br />Deere & Ault Consultants, Inc. <br />600 S. Airport Road, Building A, Suite 205 <br />Longmont, CO 80503 <br />Re: Lining of Brannan Pit No. 29, South Cell <br />NE%, Section 35, T1 S, R67W, DMG #80183 <br />Water Division 1, Water District 2 <br />Dear Colby: <br />O <br />Bill Owens <br />Governor <br />Russell George <br />Executive Director <br />fist 7. Simpson, P.E. <br />State Engineer <br />James R. Hall, P.E. <br />Division One Engineer <br />The purpose of this letter is to approve the lining of the above referenced site. This storage site <br />consists of a lined gravel pit cell, known as South Cell, located in the southern % to 213 of this <br />mining area. The northern portion of this mining area is still being actively mined and has not <br />been tested. <br />This approval is based on the site inspection conducted on March 31, 2006 and on the information <br />provided by you under cover letters dated February 13, May 23, June 22 and July 13, 2006. The <br />estimated site inflow from precipitation and groundwater seepage as well as the outflow due to <br />evaporation and pumping indicate that this site has been lined to the design standard <br />referenced in the August, 1999 State Engineer Guidelines for Lining Criteria for Gravel Pits. <br />Meeting the design standard requires that all water inflows and outflows for this site must <br />be accounted for on at least a monthly basis. <br />Please call me if you have any questions. <br />Sincerely, <br />David L. Nettles, P.E. <br />Assistant Division Engineer <br />BrannanPit29LineOK.doc <br />CC: Bob Stahl, Water Commissioner <br />Suzanne Sellers, Denver SEO