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Amended Aggregate Industries South Platte Combined SWSP August 27, 2019
<br /> Plan IN 3614, 4773, 3624, 4772, 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 al/da /ft X ft W ft OF (days)
<br /> Jeronimus Pit 100,000 1,600 23,000 -
<br /> Hazeltine Pit 100,000 1,200 23,000 -
<br /> Brighton Pit - - - 10
<br /> Tucson South Pit 75,000 1,600 4,600 -
<br /> Wattenberg Pit 80,000 1,200 5,500
<br /> Platte Valley Pit 150,000 1,400 7,400
<br /> Distel Pit 50,000 700 5,300
<br /> Tull Pit 50,000 4,900 9,300
<br /> W.W. Farms Pit 120,000 900 8,750
<br /> F-Street Pit 120,000 2,600 5,000
<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 Poudre River
<br /> Projected
<br /> Replacement Sources 2019 Yield Comments
<br /> acre-feet
<br /> WhitneyDitch 157.92 13.5 shares
<br /> Bucklen Pit 61.83 Annual lease of excess augmentation credit
<br /> Greeley irrigation Com an 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 ti
<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
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