2017-06-20_HYDROLOGY - M1981022 - Laserfiche WebLink

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G.L. Pit SWSP June 19, 2017 Plan ID 5369 Page 2 of 4 Office of the State Engineer 1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 www.water.state.co.us Lagged depletions will total 0.07 acre-feet for this plan period. A monthly breakdown of the lagged depletions is shown in the attached Table 2. As shown in Table 2, all remaining lagged depletions will accrue to the river during this plan period. Replacements The proposed source of replacement water for this pit is a lease of fully consumable water from the Lake Canal Reservoir Company (“LCRC”). A letter from the LCRC indicating that they have reserved 1.0 acre-foot of water for use in this SWSP, dated April 28, 2017, is attached. The replacement water will come from a system of reservoirs owned by LCRC known as the Gray Lakes, located in Section 34, T8N, R68W, 6th P.M. Water from the reservoirs is delivered to Boxelder Creek and then to the Cache la Poudre River, downstream of the G.L. Pit. The LCRC obtained a decree in Division 1 Water Court case no. 2006CW276 to change the use of water stored in North Gray Reservoir (WDID 0303750) and South Gray Reservoir (WDID 0303751) to add augmentation and replacement use. The G.L. Pit is located within the River Reach described in case no. 2006CW276. A total of 0.16 acre-feet of water will be released from the Gray Lakes for replacement purposes under this plan, of which 0.07 acre-feet represents the consumptive use portion to be used as replacement water, and 0.09 acre-feet represents the return flow obligations. A monthly breakdown of projected replacements and depletions is shown in the attached Table 3. Transit losses may be assessed as determined by the water commissioner or division engineer (currently assessed at 0.25% per mile along Boxelder Creek for 6.3 miles). The use of the LCRC water must be in accordance with the decree entered in case no. 2006CW276. The accounting for case no. 2006CW276 was approved on January 14, 2016, as required by the decree. Delivery of replacement water to the confluence of Boxelder Creek and the Poudre River is anticipated to be sufficient during the irrigation season; however, this replacement location may not be sufficient for the non- irrigation season if the Timnath Inlet Canal (WDID 0300924) is calling for water. The canal headgate is located below the G.L. Pit but above the confluence of Boxelder Creek with the Cache la Poudre River. At times when the Timnath Inlet Canal has placed a valid call for water, the Applicant shall ensure that the LCRC water is instead delivered to the canal. The proposed operational plan, when the Timnath Inlet Canal is calling for water, is to deliver the replacement water to the Lake Canal diversion structure located off of Box Elder Creek where the water will be measured and recorded. The water will then run down Lake Canal to a point on the canal were the water will be delivered to the Timnath Inlet Canal. Long Term Augmentation The site has been backfilled to eliminate all ground water exposed within the mining boundaries, and all remaining lagged depletions will be replaced under this SWSP; therefore there are no ongoing depletions associated with the G.L. Pit that must be augmented. An Abandonment Report has been filed for well permit no. 42334-F. Conditions of Approval I hereby approve the proposed substitute water supply plan in accordance with § 37-90- 137(11), C.R.S., subject to the following conditions: 1. This plan shall be valid for the period of June 1, 2017 through May 31, 2018 unless otherwise revoked or superseded by decree. 2. Approval of this plan is for the purpose as stated herein. This SWSP does not authorize the use or exposure of any ground water at the pit. Any additional uses for which the water