2009-02-04_HYDROLOGY - M1977522 - Laserfiche WebLink

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.A DEPARTMENT OF NATURAL RESOURCES ?C s DIVISION OF WATER RESOURCES Bill bitter, Jr. Governor Ms. KC Hallett 4 Applegate Group, Inc. 1499 West 120th Avenue, Suite 200 Denver, Colorado 80234-2759 January 27, 2009 RE: Substitute Water Supply Plan, Feit Pit, DRMS-M-77-522 Section 26, T6N, R66W, 6th P.M. Water Division 1, Water District 3, Weld County Approval Period: November 1, 2008 through October 31, 2009 Contact Phone Number for Ms. Hallett: 303-452-6611 Harris D. Sherman Executive Director Pick Wolfe, P.E. Director RECEIVED EB 0 4 2009 Dear Ms. Hallett: p}vision of Reclamation, We have reviewed your letter of September 24, 2008 requesting renewal of theNab ve efes raenced substitute water supply plan ("SWSP") for an existing sand and gravel operation. The required fee of $257.00 for the renewal of this substitute supply plan has been submitted. The original supply plan was approved on August 8, 2000 and it was most recently approved in a letter dated December 13, 2007. Plan Operations The total surface area of the groundwater exposed at the site equals 35.8 acres (21.1 acres at the West Pit and 14.7 acres at the East Pit). According to the information submitted, 29.7 acres of ground water was exposed after December 31, 1980 and 6.1 acres of ground water was exposed within the reclamation permit boundary prior to January 1, 1981. The Feit Pit is being dewatered from April though October to allow dry mining thus reducing the total exposed surface area to 15.7 acres (9.6 acres exposed after 1980, and 6.1 acres exposed prior to January 1, 1981). The pit is allowed to fill from November through March. In previous plans for the Feit Pit, instantaneous depletions to the river system were assumed not only for dewatering but for all the other operational losses, under the assumption that the pit is located within 100 feet of the Cache La Poudre River. However, based on the information provided in this SWSP, it was determined that the average down-gradient extent of the exposed groundwater is approximately 250 feet from the Cache La Poudre River. Therefore, a stream depletion model was used to determine the lagged depletions to the Cache La Poudre River. Depletions The anticipated net depletions for this plan are 37.1 acre-feet per year. The evaporative Office of the State Engineer 4 1313 Sherman Street, Suite 818 o Denver, CO 80203 • Phone: 303.866-3581 • Fax: 303$66-3589 www.watf.r.state.coms