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0`� DEPARTMENT OF NATURAL RESOURCES ✓ <br /> 01, DIVISION OF WATER RESOURCES <br /> John W.Hickenlooper <br /> 'F 1876 Governor <br /> Mike King <br /> June 27, 2014 Executive Director <br /> Dick Wolfe,P.E. <br /> Director/State Engineer <br /> Todd Williams <br /> Mr. <br /> and Weiss Consulting, LLC <br /> 5255 Ronald Reagan Blvd., Ste. 220 <br /> Johnstown, CO 80534 <br /> RE: G.L. Substitute Water Sup Plan (WDID 0302518) <br /> G.L. Gravel Pit, DRMS No. -1981-022 (WDID 0303008) <br /> NW114 Section 3, T7N, R69W, 6th P.M. RECEIVED <br /> Water Division 1, Water District 3, Larimer County <br /> Approval Period: June 1, 2014 through May 31, 2015 JUN 3 0 2014 <br /> Contact Phone Number for Mr. Williams: (303) 653-3940 Division of Reclamation, <br /> Dear Mr. Williams: Mining b Safety <br /> Your letter dated April 15, 2014 requesting renewal of the above referenced substitute <br /> water supply plan to cover depletions caused by an existing gravel mining operation has been <br /> reviewed. The required fee of $257 for the renewal of this substitute water supply plan has been <br /> submitted (receipt no. 3664504). The original plan was approved on March 26, 1993 and was <br /> most recently renewed on May 15, 2013 for operations through May 31, 2014. <br /> Plan Operation <br /> Mining at the G.L. Pit has been completed. The original reclamation plan included <br /> constructing a lined water storage reservoir. In February 2011, the Division of Mining, <br /> Reclamation, and Safety (DRMS) approved Technical Revision 02 (TR-02) changing the <br /> reclamation plan to eliminate the lined reservoir and instead backfill all ground water exposure. <br /> Based on November 2012 backfilling operations the exposed ground water was reduced from <br /> 2.3 acres to 1.67 acres. Additional backfilling of the site occurred during the 2013. The Applicant <br /> used a Global Positioning System (GPS) receiver on March 10, 2014 and marked the remaining <br /> exposed surface area boundaries. The current exposed water surface at the site is 1.16 acres <br /> as shown on the attached Map 2. This is a reduction of 0.51 acres in surface area from the <br /> 2013 SWSP approval. For the purpose of projecting depletions, this SWSP assumes the <br /> exposed ground water will remain at 1.16 acres for the entire SWSP approval period though <br /> backfilling is planned to occur. Note that all ground water at this site was exposed after <br /> December 31, 1980. <br /> Depletions <br /> The only consumptive use associated with the G.L. Pit site will be from evaporation of <br /> exposed groundwater. As mentioned above the current exposed surface area at the G.L. Pit is <br /> 1.16 acres. Net evaporative depletions were calculated using a gross annual evaporation of <br /> 39.0 inches from the exposed water surface, with a credit of 8.9 inches for effective <br /> precipitation. The total evaporative depletions from the 1.16 acre pond are therefore 2.91 acre- <br /> feet per year. <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.Ovate r.sta te.co.u s <br />