2009-03-17_HYDROLOGY - M1977036 - Laserfiche WebLink

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a Mr. Richard Raines March 17, 2009 Middle Poudre Combined Plan - Lafarge West, Inc. Page 5 of 9 the Weitzel Pit site. The historical consumptive use credit of 1 Box Elder Ditch share associated with the Weitzel Farm was determined to be 43.8 acre-feet. This is based on a historical consumptive use analysis that was completed in support of an application for an augmentation plan pending in case no. 2002CW205. The historical consumptive use credit of the 2 Box Elder Ditch shares associated with the Swift Farm was determined to be 101.1 acre-feet based on the historical consumptive use analysis in case no. 94CW015. As described in 94CW105, the Swift Farm is no longer irrigated and the decree references 70 acres of dry-up associated with the 2 shares. The total consumptive use credit available from the 8.5 Box Elder Ditch shares is 426.26 acre-feet. The attached Table 3 shows the farm headgate delivery of the 8.5 Box Elder Ditch shares. Lafarge plans to divert the full farm headgate delivery of 756.90 acre-feet into the recharge site. A total of 365.00 acre-feet were diverted into the recharge site between May 4 and October 28, 2008. Because of the small volume of recharge in 2008, Lafarge had a shortfall of 188.8 acre-feet. The 2008 depletions not covered by recharge were replaced by leases with the Lake Canal Reservoir Company ("LCRC"), City of Greeley ("Greeley") and City of Fort Collins ("Fort Collins") as shown on the attached Table 6. A copy of the lease with the LCRC was submitted to this office on January 9, 2008. Copies of the Greeley and Fort Collins leases were submitted with this plan request and they are attached to this letter. Lafarge will divert the full farm headgate delivery of the 8.5 Box Elder Ditch shares starting in April 2009. Accordingly, the monthly timing of 756.90 acre-feet (full farm headgate delivery of the 8.5 shares) was used in the recharge model to determine the recharge accretion credits for 2008. The lagged accretions to the Cache la Poudre River are estimated to total 578.74 acre-feet for this approval period (includes carry over from recharge in previous years). The Three Bells site was continuously dewatered at a rate of 1,200 gallons per minute. The timing of the lagged depletions from the dewatering operation was determined through a stream depletion model for the Three Bells Pit. The model addresses the lagged depletions at the Greeley 35th Avenue Pit, East Rigden Pit, Kyger Pit, Port of Entry Pit and Weitzel Pit by accounting for the net accretion credits at the river that occur due to the dewatering operation at the Three Bells Pit. These accretions are applied to this plan against depletions from the Greeley 35th Avenue Pit, East Rigden Pit, Kyger Pit, Port of Entry Pit and Weitzel Pit. The attached Appendix F summarizes the accretion credits from dewatering at the Three Bells Pit. During the Water Year 2009, a lease from the City of Greeley will make replacements for depletions not covered by the recharge program. A lease of 44.05 acre-feet of fully consumable water from Greeley will make replacements in February, March, April, May and September. A copy of the Greeley lease for 111.37 acre-feet was submitted to this office on March 3, 2009. The lease will cover the 67 acre-feet through the trade agreement and the remaining 44.05 acre-feet for February, March, April, May and September. The remaining 34 acre-feet from the Greeley lease used to cover the short fall in 2008 water year will cover the replacement requirements from November 2008 through February 2009. According to the information provided the 34 acre-feet was released in November 2008. A monthly breakdown of the stream depletions from the mining operations as well as the replacements is shown in the attached Table 1. Conditions of Approval I hereby approve the proposed substitute water supply plan in accordance with Section § 37-90- 137(11), C.R.S. subject to the following conditions: