2009-12-14_HYDROLOGY - M2001107 - Laserfiche WebLink

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DEPARTMENT OF NATURAL RESOURCES IYIG(!, DIVISION OF WATER RESOURCES Bill Ritter, Jr. December 14, 2009 Governor James B. Martin Executive Director Dick Wolfe, P.E. Director /State Engineer Ms. Michelle L. Hatcher Clear Water Solutions 4 -10 8010 S. Country Road 5, Ste. 105 Windsor, CO 80528 RE: Substitute Water Supply Plan, NCCI Pit #1, M- 2001 -107 (WDID 0202566) Section 24, T2N, R67W, a P.M. Water Division 1, Water District 2, Weld County 1'Ui3. Approval period: January 1, 2010 through December 31, 2010 ( 14- 2009 Contact phone number for Ms. Michelle L. Hatcher. 970 - 223 -3706 Dear Ms. Hatcher: We have received your letter of October 30, 2009, requesting renew of the above referenced substitute water supply plan to cover depletions caused by an existing gravel mining operation operated by Northern Colorado Constructors, Inc. ( "Applicant'). The required fee of $257.00 for the renewal of this substitute supply plan ( "SWSP ") has been submitted (receipt no. 3643266). The original supply plan was approved on December 30, 2002 and the SWSP was most recently renewed on November 12, 2008. Plan Operation This plan seeks to replace depletions resulting from mining at the NCCI Pit #1 ( "NCCI Pit" — WDID 0203016). There will be a dewatering trench around the active mining cell. Water from the trench will be collected in a process water pond then pumped. to a sedimentation pond. After sedimentation, the water will be returned to Little Dry Creek where it will flow back to the South Platte River. In addition, the dewatering trench will include two 20 ft x 300 ft and two 20 ft x 200 ft ponds; another 100 ft x 200 ft pond will be used for process water for the concrete plant. The total exposed water surface at the site is 2.73 acres. In order to provide a buffer to neighboring wells from dewatering, the Applicant constructed two recharge ditches on the southern end of the property. The Applicant will place a portion of its dewatering water into these recharge ditches. During the period of this SWSP, depletions at the site will result from evaporation, water lost in mined product, and dust control. The Applicant does not anticipate using any water for the production of concrete and asphalt during the requested plan period. The lagged depletions will be replaced using fully consumable effluent leased from the City of Thornton ( "Thornton "). The reclamation plan for the NCCI Pit is to place a compacted clay liner around the interior of the mine slopes for the purpose of preventing groundwater seepage from entering the pit. The applicant has bonded for lining of the pit through the Colorado Division of Reclamation Mining & Safety. 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