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Amended Aggregate Industries South Platte Combined SWSP August 27, 2019 <br /> Plan I Ds 3614, 47731 3624, 47721 4616, 3437, 3376, 3650, 3668, and 5475 Page 6 of 21 <br /> the river channel, 3) T - transmissivity of the alluvial aquifer (in gallons per day per foot) between <br /> the well and the river, and 4) S - specific yield (0.2 was used for all wells). The parameters used in <br /> the model for each site are listed in Table D below. <br /> Table D - Aquifer Characteristics <br /> Site Name T gal/day/ft X ft W ft OF days <br /> Jeronimus Pit 100,000 11600 232000 - <br /> Hazeltine Pit 100,000 1,200 237000 - <br /> Brighton Pit - - - 10 <br /> Tucson South Pit 75,000 1,600 41600 - <br /> Wattenber Pit 80;000 1,200 51500 - <br /> Platte Valley Pit 150,000 1,400 7,400 - <br /> Distel Pit 50,000 700 5,300 - <br /> Tull Pit 50,000 41900 91300 - <br /> W.W. Farms Pit 120,000 900 81750 - <br /> F-Street Pit 120,000 1 2,600 5,000 1 - <br /> The consumptive use and lagged stream depletions from each site are summarized in the <br /> attached "South Platte Combined Substitute Supply Plan Accounting 2019" sheet. <br /> Replacements <br /> Lower Poud re River <br /> Projected <br /> Replacement Sources 2019 Yield Comments <br /> (acre-feet <br /> Whitney Ditch 157.92 13.5 shares <br /> Bucklen Pit 61.83 Annual lease of excess augmentation credit <br /> Greeley Irrigation Company 38.42 Lease of 3 shares <br /> Note: Projected 2019 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 />