2009-03-17_HYDROLOGY - M1977036 - Laserfiche WebLink

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Mr. Richard Raines March 17, 2009 Middle Poudre Combined Plan - Lafarge West, Inc. Page 7 of 9 up will be in the form of an affidavit signed by an individual having personal knowledge of the dry up for the entire irrigation season for each parcel of land used in this SWSP. The Applicant shall provide all affidavit(s) to the division engineer by November 15, 2009 in order that the final determination of augmentation credits for the irrigation season can be made along with mapping showing any revisions to the dry up acreage. The Applicant shall modify accounting to reflect that the credit from any dried-up fields containing alfalfa or native grass was assessed in the following manner: (a) For fields deep tilled or chemically treated to successfully kill alfalfa or native grass, 100% credit will be given for consumptive use as otherwise computed under the conditions of this approval. (b) For fields not deep tilled or chemically treated to successfully kill alfalfa, records of monthly monitoring of depth to groundwater at existing irrigation wells or existing or new monitoring wells or piezometers within Y4-mile of each alfalfa or native grass field must be maintained. Credits will be reduced according to the following table when depth to groundwater is less than the depth assumed to provide no significant contribution to alfalfa growth. Measurements taken at the start of each month will determine the necessary reduction in credit to be applied during the following month. The applicant may use another methodology upon review and approval by the State Engineer and Division Engineer. Depth to Ground W Percent Reduction in CU Credit' ater (Feet) Native Grass Alfalfa 1 85% 100% 2 50% 90% 3 30% 75% 4 20% 50% 5 15% 35% 6 10% 20% 7 5% 15% 8 0% 10% 1. Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN FORMERLY IRRIGATED MOUNTAIN MEADOWS, South Park, Colorado, March 1, 1990; Revised September 1, 1991 11. This substitute water supply plan may be revoked or modified at any time should it be determined that injury to other vested water rights has or will occur as a result of this plan. Should this supply plan expire without renewal or be revoked prior to adjudication of a permanent plan for augmentation, all use of ground water must cease immediately. 12. Lafarge, West, Inc. filed for a plan for augmentation for the Port of Entry Pit site in case no. 2004CW111 and filed for a plan for augmentation for the Weitzel Pit site in case no. 2002CW205. Lafarge is required to operate the Port of Entry Pit site and the Weitzel Pit site under an SWSP until such time as a decree is entered in case nos. 2004CW111 and 2002CW205. If reclamation of the mines at the Three Bells Pit, Kyger Pit, and Greeley 35th Avenue Pit sites produces a permanent water surface exposing groundwater to evaporation, an application for a plan for augmentation must be filed with the Division 1 Water Court at least three years prior to the completion of mining to include, but not be limited to, long-term evaporation losses. If a lined pond results after reclamation, replacement of lagged depletions shall continue until there is no