2014-09-09_HYDROLOGY - M2002020 - Laserfiche WebLink

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DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES September 2, 2014 Ms. Michelle Cunico Johnson, P.E. Martin and Wood Water Consultants, Inc 538 Commons Drive Golden, Colorado 80401 Re: Amended 25th Ave Substitute Water Supply Plan, WDID 0303330 25th Ave Pit, DRMS No. M- 2002 -020, WDID 0303040 Section 36, T6N, R66W, 6th P.M. Water Division 1, Water District 3, Weld County Approval Period: June 1, 2014 through May 31, 2016 Contact Phone Number for Ms. Johnson: 303 - 526 -2600 Dear Ms. Johnson: John W. Hickenlooper Govemor Mike King Executive Director Dick Wolfe, P.E. Director /State Engineer Std' J J L014 Mining & Safety We have reviewed your letter dated July 31, 2014 requesting amendment of the above referenced substitute water supply plan ( "SWSP ") on behalf of the City of Greeley ( "Greeley "). The amendment is sought to revise the estimates of aggregate production, dust control use, and dewatering at the 25th Avenue Pit site. The required fee of $257.00 has been submitted (receipt no. 3666241). All terms and conditions of the SWSP dated July 8, 2014 that are not explicitly amended herein remain in full force and effect. Amended Plan Operation Since the time of the original SWSP approval on July 8, 2014, the operator has reported increased dewatering as a result of high water flows in the Cache la Poudre River, and increased aggregate production and dust control water requirements due to an increase in demand for aggregate. As a result, the estimated depletions and required replacement obligations have changed from those contemplated in the original SWSP, as detailed below. Operational Depletions The applicant has revised the estimate of aggregate production at the site to 596,828 tons of aggregate mined during the first year of this plan period, and 864,000 tons of aggregate mined during the second year of this plan period. These amounts are based on actual aggregate production for June and July 2014, and based on operator estimate thereafter. The material will be mined below the ground water table in a dewatered state and not washed; therefore the water retained in the mined product is considered to be 2.0% of the mined material by weight. This amounts to a ground water loss of approximately 8.79 acre -feet during the first year of this plan period, and 12.71 acre - feet during the second year of this plan period. The estimated water requirement for dust suppression use, which is considered to be 100% consumptive, has also been revised to 1.97 acre -feet for the first year and 2.0 acre -feet for the second year. Based on these revised estimates, operational losses will total 10.76 acre -feet during Office of the State Engineer 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303 - 866 -3581 • Fax: 303 - 866 -3589 www.water.state.co.us