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August 3, 2011 S WSP PS 1") DIVISION OF WATER RESOURCES DEPARTMENT OF NATURAL RESOURCES Cheryl Signs, P.E. Cheryl Signs Engineering 109 East Fourth Avenue Denver, CO 80203 Re: Durham Pit, SubOtute Water Supply Plan (WDID 0302535) Amendment DRMS File No. -78 -056 (WDID 0303029) Sections 3, 9, and 10, T5N, R65W, 6 P.M. Dakolios Pit DRMS File No. M -84 -036 Section 31, T3N, R67W, 6 P.M. Water Division 1, Water Districts 3 and 5, Weld County, Colorado Approval Period: January 1, 2011 through December 31, 2012 Contact Phone Number for Ms. Cheryl Signs: 303 - 778 -7653 Dear Ms. Signs: This letter is in response to your letter dated June 13, 2011, requesting an amendment to the approval of the Varra Companies Inc, ( "VCI ") Durham Pit Substitute Water Supply Plan ( "SWSP ") dated February 14, 2011. The purpose of this amendment is to include the evaporation from a 3 -acre pond located on the Dakolios gravel mining site DRMS Permit No. M -84 -036. All other consumptive uses of the original SWSP approved for the Durham Pit will remain the same as in the February 23, 2011 approval. Plan Operation VCI obtained a storage water rights decree in case no. 2001 CW274 for the Dakolios Reservoirs. The Dakolios Reservoirs consist of two ponds within the Dakolios Pit permitted area, which were lined with a slurry wall and the lining was approved by the Division 1 Office in accordance with the State Engineer Guidelines for Lining Criteria. According to the Division of Reclamation Mining and Safety amended application for the Dakolios Pit approximately 3 acres of ground water remain exposed at the site, which are proposed to be backfilled. Therefore, until the three acres are completely backfilled, the proposed operation will still consume ground water by evaporation. This amended plan seeks to replace depletions from evaporation from the 3 -acre pond at the Dakolios Pit site. Depletions The net evaporation depletion from the 3 -acre pond is 7.69 acre -feet per year. Computation of evaporation from the 3 -acre pond was reduced during the ice covered period. You have assumed the ice covered period to occur during the months of January, February and December, based on the average temperatures of 27.0 °F for January, 30.8° for February and 28.8 °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 exposed ground water surface area that may occur during the assumed ice covered period (the yrtonths of January, February and December) for any time that the pit Office of the State Engineer R EC E IV F 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303 - 866 -3581 • Fax: 303 - 866 -3589 www.water.state.co.us John W. Hickenlooper Governor Mike King Executive Director Dick Wolfe, P.E. Director/State Engineer AUG 042011 Division of Reclamation, Mining & Safety