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Aggregate Industries South Platte Combined SWSP April 13, 2018 <br />Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 6 of 20 <br /> <br />Replacements <br />Lower Poudre River <br />Replacement Sources Projected <br />2018 Yield <br />(acre-feet) Comments <br />Whitney Ditch 166.03 13.5 shares <br />Bucklen Pit 39.30 Annual lease of excess augmentation credit <br />Greeley Irrigation Company 45.24 Lease of 3 shares <br />Note: Projected 2018 yield may vary from previous estimates of net yields due to the computed return flow <br />obligations based on the previous year’s actual water deliveries. <br />Whitney Ditch <br /> Aggregate owns a total of 13.5 shares in the Whitney Ditch Company. The subject 13.5 shares <br />were changed in case no. 90CW23 from irrigation use to industrial mining, dust suppression, <br />reclamation, irrigation, augmentation under the plan for augmentation described in the decree, and <br />piscatorial purposes. The use of the subject shares for replacement purposes in this SWSP was not <br />decreed in case no. 90CW23; however, the Applicant has proposed to use the subject shares for <br />replacement purposes pursuant to this SWSP in conformity with the requirements of case no. <br />90CW23. <br />The decree entered in case no. 90CW23 relied on a ditch-wide analysis of the Whitney Ditch <br />developed for and decreed in case no. 08CW65. Based on a study period of 1950 through 1995, the <br />Court found that the average annual gross river diversion was 10,600.2 acre-feet per year or 33.13 <br />acre-feet per share. The ditch-wide analysis determined that the overall average consumptive use <br />was 4,400.9 acre-feet per year or 13.75 acre-feet per share for 320 shares, assuming a system loss of <br />15% and a farm efficiency of 60%. In case no. 02CW331, 8 shares historically used on 74 acres were <br />found to have a river headgate diversion of 33.42 acre-feet per share and a consumptive use of 16.32 <br />acre-feet per share (130.5 acre-feet total). After removing the consumptive use decreed for the 8 <br />shares in case no. 02CW331, the historical consumptive use for the remaining 312 shares was <br />determined to be 4,270.4 acre-feet, or 13.69 acre-feet per share. For Aggregate’s 13.5 Whitney <br />Ditch shares, the total average annual consumptive use would therefore equal 184.81 acre-feet per <br />year. The ditch-wide analysis utilized a return flow split of 50% surface and 50% subsurface return <br />flows. <br /> For the 2018 plan period, Aggregate will dedicate all 13.5 of their Whitney Ditch shares to <br />this SWSP. For the purposes of this SWSP, the projected consumptive use credit has been estimated <br />based on a dry-year farm headgate delivery of 24.75 acre-feet per share (which includes a 15% ditch <br />loss) or approximately 334 acre-feet for all 13.5 shares. After accounting for the return flow <br />obligations, the total consumptive use credit for 2018 is projected to be approximately 166 acre- <br />feet. <br /> Beginning in 2011, Aggregate utilized the return structure owned by the Whitney Irrigation <br />Company located in the SE¼ of Section 30, Township 6 North, Range 66 West, 6th P.M. Aggregate <br />anticipates that this return structure will be utilized again in 2018. A copy of the agreement <br />authorizing Aggregate’s use of this structure for the 2018 irrigation season will be obtained prior to <br />April. This source may not be used until the Applicant has provided an executed agreement. <br /> The dry-up locations for the subject Whitney Ditch shares were originally identified through <br />an April 12, 2011 letter to the Division 1 Engineer. That letter stated the northern portion of Orr <br />Farm #1 may continue to be irrigated using 1 of the 13.5 Whitney Ditch shares owned by the <br />Applicant. In 2011 the entire Orr Ditch Farm #1 was removed from irrigation due to damage to the <br />lateral serving the property. Therefore the entire farm is included as a dry-up location for all 13.5