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Ms. Sira Sartori April 13, 2010 <br />Middle Poudre Combined Plan - Lafarge West, Inc. Page 4 of 8 <br />The total lagged mining depletions for all the seven sites is 268.62 acre-feet. Real time <br />depletions were used for all six sites. <br />Replacements <br />Replacement water for this combined plan will come from the following sources: accretion credits <br />from recharge of 8.5 shares of the Box Elder Ditch, accretion credits from dewatering at the Three Bells Pit, <br />and a lease from the City of Greeley ("Greeley") for fully consumable effluent. <br />Lafarge owns 8.5 shares in the Box Elder Ditch and will use all of the shares in this combined plan. <br />The shares will be diverted into a recharge pit (WDID 0302002) through an existing lateral from the ditch. <br />The recharge pit was constructed on the un-mined portion of the Three Bells Pit site and it was excavated <br />to only the upper portion of the gravel deposit and will not expose additional ground water. The estimated <br />recharge pit size is one acre. For the purposes of this plan, evaporation from open water was assumed for <br />the entire surface area of the recharge pit for the number of days water was diverted into the recharge pit. <br />Based on this approach, the proportion of days with water diverted into the recharge pit to the number of <br />days per month was applied to the monthly gross evaporation rate, resulting in an evaporative consumptive <br />use from the recharge pit of approximately 2.04 acre-feet. <br />Lafarge owns 5.5 shares of the 6.0 shares of the Box Elder Ditch that were historically utilized for <br />the irrigation of the Three Bells property (344.3 acres). The dry-up acreage claimed for Lafarge's 5.5 <br />shares would be 305.6 acres of the 344.3 historically irrigated acres on the Three Bells property. The <br />historical consumptive use credit of the 5.5 Box Elder Ditch shares associated with the Three Bells <br />property was determined to be 281.4 acre-feet, based on a historical consumptive use analysis that was <br />completed in support of an application for an augmentation plan pending in case no. 2002CW205. <br />Lafarge also owns 1 share of 3.5 shares historically utilized for the irrigation of the Robert <br />Weitzel Farm (145 acres) and another 2 shares of 5 shares historically used for the irrigation of the <br />Louis Swift Farm. The Robert Weitzel Farm is no longer irrigated due to the mining at the Weitzel Pit <br />and the adjacent Stute Pit operated by Connell Resource, Inc. The dry-up acreage claimed for Lafarge's <br />1 share would be 41.4 acres of the 145 acres historically irrigated on the Robert Weitzel Farm. The <br />Robert Weitzel Farm property is no longer irrigated and includes the 66.7 acres of ground water lakes at <br />the Weitzel Pit site. The historical consumptive use credit of 1 Box Elder Ditch share associated with the <br />Weitzel Farm was determined to be 43.8 acre-feet. This is based on a historical consumptive use <br />analysis that was completed in support of an application for an augmentation plan pending in case no. <br />2002CW205. The historical consumptive use credit of the 2 Box Elder Ditch shares associated with the <br />Swift Farm was determined to be 101.1 acre-feet based on the historical consumptive use analysis in <br />case no. 94CW015. As described in 94CW105, the Swift Farm is no longer irrigated and the decree <br />references 70 acres of dry-up associated with the 2 shares. The total consumptive use credit available <br />from the 8.5 Box Elder Ditch shares is 426.26 acre-feet. <br />The attached Table 3 shows the farm headgate delivery of the 8.5'Box Elder Ditch shares. <br />Lafarge plans to divert the full farm headgate delivery of 756.90 acre-feet into the recharge site. A total <br />of 411.1 acre-feet were diverted into the recharge site between April 16 and October 14, 2009. The 2009 <br />depletions not covered by recharge were replaced by leases with the Lake Canal Reservoir Company <br />("LCRC"), City of Greeley ("Greeley") and Platte River Power Authority. A copy of the lease with the <br />Platte River Power Authority was submitted to this office with this plan request. Copies of the LCRC and <br />Greeley leases were submitted with the previous plan. Lafarge will divert the full farm headgate delivery <br />of the 8.5 Box Elder Ditch shares starting in April 2010. Accordingly, the monthly timing of 756.90 acre- <br />feet (full farm headgate delivery of the 8.5 shares) was used in the recharge model to determine the