2008-09-05_HYDROLOGY - M2005075 - Laserfiche WebLink

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+hm DEPARTMENT OF NATURAL RESOURCES eDpy io Card Kaj,,4-, DPN{ S DIVISION OF WATER RESOURCES Bill Ritter, Jr Governor August 22, 2008 ?tob Pierce Dufford Waldeck Milburn & Krohn LLP 744 Horizon Court Suite 300 Grand Junction, Colorado 81506 L,-' RE: 2008-2009 Glen's Pit, Substitute Water Supply Plan NE'/, Section 11, T6S, R93W Water Division 5, Water District 39, Garfield County ADMG #M-2005-075 SWSP Approval Period: June 1, 2008 through May 31, 2009 Harris D. Sherman Executive Director Dick Wolfe, P.E. Director RECEIVED SEP 0 5 2008 1vision of Kedamation, Mining and Safety Dear Rob: We have completed review of your April 14, 2008 request for renewal of the substitute water supply plan (SWSP) to be operated by United Companies ("Applicant") in accordance with Section §37-90-137(11), C.R.S. The applicant shall be responsible for compliance with this plan, but the State Engineer's Office may also pursue the landowner for eventual compliance. The required fee of $257 for the renewal request has been submitted. Glen's Pit is a proposed gravel mine that will be reclaimed as an unlined pond. This plan describes the proposed water uses for the period June 2008 through May 2009. During mining, up to 3.57 acres of groundwater may be exposed within the permit area, including dewatering trenches and the settling pond. A renewal of this SWSP or a permanent augmentation plan will be needed to provide replacement water for ongoing post-mining depletions beginning June 1, 2009. The pit will remain continuously dewatered until reclamation is completed. You have provided a monthly breakdown of the post-mining annual depletions at this site in your Table 3 (copy attached). The table shows that the maximum total lagged stream depletions are conservatively estimated to be 50.21 acre-feet per year corresponding to an exposed surface area of 17.52 acres. The estimated depletions are based solely upon steady- state lagging of groundwater evaporation from the reclaimed pit, which exceed the lagged depletions estimated from mine operation consumptive uses as provided in your Table 3. As a conservative measure, you have proposed to use the post-mining depletions to determine the monthly replacement requirements (see table 1 below). Mine operation depletions will consist of evaporation of exposed groundwater, water loss in mined material, dust control, asphalt and concrete production, and sanitary uses. Total monthly depletions for each use will be limited to the totals provided in your Table 3. No groundwater will be used for any other purpose. No phreatophyte credit has been applied to this plan. The proposed source of replacement water for this pit is fully consumable water released from Ruedi Reservoir by the West Divide Water Conservancy District (WDWCD). A 7.5 percent transit loss will be applied to all deliveries as specified in the following table: Office of the State Engineer 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3589 www.watenstate.co.us