2018-08-30_HYDROLOGY - M2017032 (2)

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Mr. Paul Bruss, P.E. August 30, 2018 Page 3 of 6 acre-foot during the plan year. The maximum water removed with product, assuming 20,000 tons of product removed, total 0.59 acre-feet. The current surface area of ground water exposed after 1980 is identified as 11.3 acres. During the period of this SWSP, additional ground water may be exposed, so evaporative depletions were estimated using a maximun exposed surface area of 15 acres. Evaporative depletions were estimated using the same net evaporation rate as previous Rocky Ford East Pit SWSPs (3.85 feet/acre/year) and total 57.75 acre feet over the plan year. These values were lagged using a Glover analysis with the parameters as given below: Distance from river: 3,522 ft Distance from alluvial boundary: 7,670 ft Transmissivity: 71,000 gpd/ft Specific yield: 0.2 Total lagged depletions for this plan year are 46.50 AF (see attached Table 5a). REPLACEMENTS Deep Cut will utilize a combination of leased water and historical ditch credits to make replacements to the river. A lease dated February 26, 2018 from the City of Aurora was obtained to provide replacement supplies during this SWSP approval period for 35 acre-feet (lease attached). This lease is valid until December 31, 2023 unless terminated by either party. Chris Tomky of Deep Cut is the owner of 17.45 shares of Twin Lakes Reservoir and Canal Company, including Twin Lakes Reservoir storage associated with those shares, and approximately 19.25 acre-feet of associated storage. The water lease allows Chris Tomky to trade with the City of Aurora 35 acre-feet of Twin Lake shares for 35 acre-feet of Aurora's fully consumable water stored in the Colorado Canal System, released from Meredith Reservoir Valco owned 2 shares in the Rocky Ford Ditch, which have been transferred to Deep Cut. However, these shares may result in consumptive use credits in excess of what Deep Cut requires for this season. Valco may, with approval from Deep Cut and the Division Engineer, use a portion of those shares as part of its SWSP replacement requirement. The two shares together are expected to yield approximately 25.72 AF/year. CONDITIONS OF APPROVAL I hereby approve the proposed SWSP in accordance with Section 37-90-137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of August 1, 2018 through July 31, 2019 unless otherwise revoked or superseded by decree. If this SWSP will not be made absolute by a water court action by the SWSP expiration date, a renewal request must be submitted to this office and the Division 2 office (please copy Kathy Trask at Kathy.Trask@state.co.us and Bethany. ArnoldCstate.co. us) with the statutory fee per gravel pit (currently $257) by June 1, 2019.