2017-12-28_INSPECTION - M1985026 (3)

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Mr. Peter Wayland Page 2 of 8 Challenger SWSP November 17, 2016 Note, that the approval of this substitute water supply plan does not relieve the Applicant and/or landowner of the requirement to obtain a Water Court decree approving a permanent plan for augmentation or mitigation to ensure the permanent replacement of all depletions, including long-term evaporation losses and lagged depletions after gravel mining operations have ceased. To allow additional time for filing, the deadline for submitting an application for a plan for augmentation is hereby extended to December 31, 2017 by way of this letter. Approval of this plan does not imply approval by this office of any related litigation. By that date the Applicant or its successor in ownership must have either filed an application with the Water Court for a court-approved augmentation plan or commenced lining or backfilling of the site or explain why an extension to the above deadline is required. Depletions The anticipated net depletion for this plan is 52.62 acre-feet per year for up to 23 acres of water exposed after December 31, 1980. Gross evaporation at this site is taken from NOAA TR-33 Map 3 and is estimated to be 41 inches per year with an effective precipitation amount of 10.58 inches. The lagged evaporation depletions from the Challenger Pit were estimated by the Applicant's consultant using the Integrated Decision Support group's Alluvial Water Accounting System (IDS AWAS) stream depletion model with the following assumptions: • Distance from the centroid to the river; XPond I - 642 ft, XPond Z = 322 ft, XPond 3 = 263 ft • Alluvial aquifer width (W) = 1,700 ft • Specific Yield (S) = 0.2 • Transmissivity (T) = 67,325 (gpd/ft) The stream depletions model was taken to a steady state condition and show that the stream depletions will equal the yearly evaporation of 52.62 acre-feet at a monthly rate as shown in the attached Table All.2. Replacement The proposed source of replacement for this pit includes historical consumptive use credit from 7.4 shares of Hill Ft Brush Ditch water rights from the dry-up of 37 acres of land, and a water lease with the City of Loveland. The applicant has a 25-year Water lease with the City of Loveland ("Loveland") for 100 acre-feet of fully consumable water which is used for replacement purposes for Gardels Pit, Kitright Pit and Brownwood Pit gravel pits operated by the Applicant, including the Challenger Pit. Loveland will deliver this water to the Big, Thompson River approximately 10 miles upstream of the Challenger Pit, at their waste water treatment plant (WDID 0402300). Therefore a transit loss of 2.0% (8 miles @ 0.25%/mile) will be assessed on all releases. Transit Losses are subject to change at the water commissioner's discretion. The monthly depletion and replacement requirements, based on an average year are found on the attached Table A11.2. Under the terms of the Loveland lease, replacements can be made using a variety of water owned by Loveland including, but not limited to, Windy Gap reusable effluent, Loveland Storage Reservoir water as decreed in case no. 82CW202A, and Colorado Big Thompson ("C-BT") Project water. In the event that Loveland plans to use C-BT water as a