Laserfiche WebLink
STATE OF COLORADO <br />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 />Mr. Chris Sanchez <br />Bishop-Brogden Associates, Inc. <br />333 West Hampden Avenue, Suite 1050 <br />Englewood, CO 80110 <br />??eII <br />LIAR ? 8 p e <br />March 27, 2007 <br />Re: Lining of Ergers Pit, Section 12, T1 S, R67W, Water Division 1, Water District 2 <br />Dear Chris: <br />re>: <br />? 1876 <br />Bill Ritter, Jr <br />Governor <br />Hams 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. Hall-Irwin Construction completed installation of the slurry <br />wall in mid-December 2000. The approval/testing process began on February 16, 2006 with a <br />discussion involving you and Jeff Clark of Bishop-Brogden Associates With Dick Wolfe and I of <br />Colorado Division of Water Resources as to the proper procedures to test an un-mined area <br />enclosed by a soil-bentonite slung wall. Based on that meeting, additional discussions, <br />correspondence, and a DWR site inspection on March 14, 2006, an agreed upon testing <br />procedure was developed. The test procedure was implemented beginning on November 6, <br />2006. <br />You provided the results of the 90 day test under a !over letter dated February 22, 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 desilan 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 slung wall enclosed area must be <br />accounted for on a monthly basis. <br />Please call me if you have any questions. <br />ErgersPitLineOK.doc <br />Sincerely, <br />*az? <br />David L. Nettles, P.E. <br />Assistant Division Engineer <br />CC: Bob Stahl, Water Commissioner <br />Suzanne Sellers, Denver SEO <br />Dick Wolfe, Denver SEO