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6,m <br />?r Dn1Rlb WK <br />DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />June 17, 2008 <br />Mr. William M. Blatchley <br />Blatchley Associates, Inc. <br />2525 South Wadsworth Blvd., #306. <br />Denver, Co 80227 <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Dick Wolfe, P.E. <br />Director <br />RECEIVED <br />Re: Clare Gravel Pit 6bstitute Water Supply Pla1'i ?? N Z 4 2008 <br />DRMS File No.VA989-044 Division <br />Section 1, T13S, R71W of the 6tn P M. of Reclamation, <br />Mining and Safety <br />Water Division 1, Water District 23 <br />Approval Period: May 1, 2008 through August 3, 2009 (or April 30, 2010) <br />Contact Phone Number for Mr. William Blatchley: 303-989-6932 <br />Dear Mr. Blatchley: <br />We have reviewed your letter dated April 1, 2008, requesting renewal of the above referenced <br />substitute water supply plan to cover depletions caused by an existing sand and gravel pit owned by <br />Clare Corporation, Inc. and operated by A. C. Concrete & Materials in accordance with § 37-90-137(11) <br />C.R.S. The required fee of $257 for the renewal of this substitute water supply plan has been submitted. <br />The original plan was approved on August 3, 2006. <br />According to the information provided A. C. Concrete & Materials was unable to start mining <br />during the last approval period. Therefore, this plan describes the proposed water uses at the <br />historically mined Clare Pit during the next two years of this operation. The proposed plan anticipates <br />a maximum year net depletion of 1.88 acre-feet for up to 3.5 acres of exposed groundwater surface <br />during the approval period. According to the attached affidavit by Harold E. Clare, II a portion of this <br />pit (0.7 acres) exposed groundwater prior to January 1, 1981 and, as such, the evaporation from that <br />portion of the pit does not require augmentation. Depletions from the mining of this existing operation <br />will accrue to Twin Creek. <br />You have provided a monthly breakdown of the maximum year annual depletions totaling 0.88 <br />acre-feet of evaporative loss from a maximum of 2.8 acres of groundwater exposed after January 1, <br />1981 and 1.0 acre-feet of water lost with the mined product. Phreatophyte credit has been applied to <br />this plan for the willows which previously occupied the pit area along the Twin Lake riparian corridor. <br />No dewatering is provided or sought under this SWSP. <br />Although the water supply report, estimates the gross evaporation rate at 34 inches, for the <br />purposes of this plan, gross annual evaporation using NOAA Technical Report NWS-33, Evaporation <br />Atlas for the Contiguous 48 United States was determined to be approximately 40 inches. Therefore, <br />using the State Engineer's General Guidelines for Substitute Supply Plans for Sand and Gravel Pits, <br />the State Engineer has determined the net depletions for this SWSP to be 2.11 acre-feet for the 2.8 <br />acres of water surface to be exposed at the site. Based on the above-mentioned guidelines, the net <br />evaporation for the 2.8 acres was determined to be 1.11 acre-feet after applying the 4.02 acre-feet <br />Office of the State Engineer <br />1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3589 <br />www.water.state.co.us