HYDRO31091

• Permit No: M1977036
• IBM Index Class Name: Hydrology
• Doc Date: 2/2/2007
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Applegate Group, Inc.
• Media Type: D
• Archive: No

Mr. Richard Raines Page 4
Middle Poudre Combined Plan -Lafarge West, Inc. January 26, 2007
Lafarge owns 550 Boyd and Freeman Ditch shares which were historicarily used for
irrigation on the Greeley 35`" Avenue Pit mining site. Irrigation has ceased on the 35 Avenue Pit
site due to the mining operation and groundwater lakes. The historical accretions and depletions
for the 475 shares were prorated from the 550 Boyd and Freeman shares that originally irrigated
the property. The dry-year historical consumptive use credit from the 475 Boyd and Freeman
Ditch shares is 245 acre-feet with anon-irrigation season return flow obligation of 16.6 acre-feet.
The transit losses between the Three Bells Pit and the Greeley 35`" Avenue Pit will also be
replaced by the applicant's Boyd and Freeman Ditch shares.
The source of replacement water for the winter months at the Greeley 35`h Avenue Pit
and the other sites included in this combined plan will be from 8.5 Box Elder Ditch shares.
Lafarge owns 8.5 shares in the Box Elder Ditch and will use all of the shares in this combined
plan. The shares will be diverted into a recharge pit through an existing lateral from the ditch.
The recharge pit was constructed on the un-mined portion of the Three Bells Pit site and it was
excavated to only the upper portion of the gravel deposit and will not expose additional ground
water. The estimated recharge pit size is one acre. For the purposes of this plan, evaporation
from open water was assumed for the entire surface area of the recharge pit for the number of
days water was diverted into the recharge pit. Based on this approach, the proportion of days
with water diverted into the recharge pit to the number of days per month was applied to the
monthly gross evaporation rate, resulting in an evaporative consumptive use from the recharge
pit of approximately 2.04 acre-feet.
Lafarge owns 5.5 shares of the 6.0 shares of the Box Elder Ditch that were historically
utilized for the irrigation of the Three Bells property (344.3 acres). The dry-up acreage claimed
for Lafarge's 5.5 shares would be 305.6 acres of the 344.3 historically irrigated acres on the
Three Bells property. The historical consumptive use credit of the 5.5 Box Elder Ditch shares
associated with the Three Bells property was determined to be 281.4 acre-feet, based on a
historical consumptive use analysis that was completed in support of an application for an
augmentation plan pending in case no. 2002CW205.
Lafarge also owns 1 share of 3.5 shares historically utilized for the irrigation of the
Robert Weizel Farm (145 acres) and another 2 shares of 5 shares historically used for the
irrigation of the Louis Swift Farm. The Robert Weitzel Farm is no longer irrigated due to the
mining at the Weitzel Pit and the adjacent Stute Pit operated by Connell Resource, Inc. The
dry-up acreage claimed for Lafarge's 1 share would be 41.4 acres of the 145 acres historically
irrigated on the Robert Weitzel Farm. The Robert Weitzel Farm property is no longer irrigated
and includes the 66.7 acres of ground water lakes at the Weitzel Pit site. The historical
consumptive use credit of 1 Box Elder Ditch share associated with the Weizel 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 4 shows the farm headgate delivery of the 8.5 Box Elder Ditch shares.
Lafarge plans to divert the full farm headgate delivery of 776.87 acre-feet into the recharge site. A
total of 550 acre-feet were diverted into the recharge site in 2005 and a total of 574 acre-feet were
diverted in 2006. Lafarge will divert the full farm headgate delivery of the 8.5 Box Elder Ditch
shares starting in April 2007. Accordingly, the monthly timing of 776.87 acre-feet (full farm
headgate delivery of the 8.5 shares) was used in the recharge model to determine the recharge