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DEPARTMENT OF NATURAL RESOURCES ?'C S DIVISION OF WATER RESOURCES March 17, 2010 Re: Shores Gravel tt, Substitute Water Supply Plan (WDID 0502522) DMG File No. _1998-013 Section 1 and 2, T2N, R68W, 6 h P.M. Water Division 1, Water District 5 Andy Rodriguez, P.E. ,,OCivil Resources, LLC 323 Fifth.Street P.O. Box 680 Frederick CO 80530 Approval Period: January 1, 2010 through December 31, 2010 Contact phone number for Mr. Andy Rodriguez: 303-833-1416 . Dear Mr. Rodriguez: Bill Ritter, Jr. Governor James B. Martin Executive Director Dick Wolfe, P.E. Director/State Engineer We have received your letter of December 12, 2009, requesting a substitute water supply plan to cover depletions caused by the Shores Gravel Pit ("Shores pit" -WDID 0505500), operated by Hall-Irwin ("Applicant'). The required fee of $257.00 for the renewal of this substitute supply plan has been submitted (receipt no. 3643800). The original plan was approved on May 21, 2001 and, it was most recently renewed on September 30, 2009. Plan Operation This plan seeks to replace depletions resulting from mining operations at the Shores gravel pit for 2010. The depletions that results from the mining operation are evaporation, water lost in mined product, concrete batching, dust suppression and dewatering. Cell A, B and C were initially dewatered and dry mined. A slurry wall was constructed around cell A and B and lining for these cells was approved in January 2007. A slurry wall was constructed around cell C however lining is currently not approved. During the period of this plan dewatering will occur only on cell D. The proposed replacement sources are net accretion credits at the river that occur due to the dewatering operation at the site (cell D).These accretions are applied to this plan against the evaporation and operational depletions at the site. The applicant has bonded through the Division of Reclamation Mining and Safety for final reclamation of the site. Depletions Currently 4.6 acres of ground water surface is exposed at the Shores Pit within the settling pond (4 acres) and the dewatering trenches (0.6 acres). Ground water from the 4 acre silt pond is used for washing aggregate, dust control and concrete batching. Annual evaporation from the 4.6 acres was estimated to be 12.28 acre-feet however, computation of evaporation under this plan was reduced during the ice covered period which reduced the net evaporation depletions to 11.57 acre-feet. You have assumed the ice covered period to occur during the months of January and December, based on the average temperatures of 26.9°F for January and 28.6°F for December; taken from the Longmont weather station. However, for the purpose of this SWSP, the Applicant shall replace the net evaporation depletions from the Office of the State Engineer 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3589 ?? wwwmater.state.co.us 4AR 17 2010 Division of keciamaiion, 01" and safety