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STATE OF COLORADO <br />WATER DIVISION ONE <br />OFFICE OF THE STATE ENGINEER <br />Division of Water Resources <br />Department of Natural Resources" <br />w 1676• <br />810 91h Street, Suite 200 <br />Greeley, Colorado 80631 <br />Phone (970) 352-8712 <br />Fax (970) 392-1816 <br />www.water.state.co.us <br />April 27, 2007 <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 Nissen Pit <br />Section 12, T5N, R65W, DRMS #03-001 <br />Water Division 1, Water District 2 <br />Dear Colby: <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Hal D. Simpson, P.E. <br />State Engineer <br />James R. Hall <br />Division Engineer <br />The purpose of this letter is to approve the lining of the above referenced un-mined gravel pit area <br />enclosed by a soil-bentonite slurry wall. Installation of the slurry wall occurred between January <br />and June, 2004. The approval/testing process began with data. collection on December 18; 2006 <br />after a' minimum head difference of ten vertical feet was established across the slurry wall. The <br />approval process also included a site visit on March 7, 2007 by myself and Jana Ash of the SEO. <br />You provided the results of the 90 day test under a cover letter dated March 28, 2007. The <br />estimated slurry wall enclosed area inflows from precipitation and groundwater during the test <br />indicate that this pit has been lined to the design standard referenced in the August 1999 <br />State Engineer Guidelines for Lining Criteria for Gravel Pits. Meeting the design standard <br />requires that all water inflows and outflows for this slurry wall enclosed area must be <br />accounted for on a monthly basis. <br />Please call me if you have any questions. <br />NissenPitLineOK.doc <br />Sincerely, <br />David L. Nettles, P.E. <br />Assistant Division Engineer <br />CC: Bob Stahl, Water Commissioner <br />Jeff Deatherage, Denver SEO <br />Randy Ray, Central Colorado WCD