2013-05-29_HYDROLOGY - M1999120 - Laserfiche WebLink

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Mr. Rick Parsons, P.E. L.G. Everist Combined SWSP Amendment 1 Page 5 of 9 May 28, 2013 For times when the accretions exceed lagged dewatering and mining operation depletions, the Applicant may divert and store this water into Lupton Meadows, Hill - Oakley, Fort Lupton, or Rinn Valley Phase 3 Reservoirs. The Swingle North and Meadows West Reservoirs are both currently unmined. Due to their respective liner leak test they are in a dewatered state. However, there still exist native trapped ground water within these two liner perimeters. The Applicant has requested the ability to `book over' free river water to replace the native ground water with fully consumable free river water. For this to occur the Applicant must adequately document the volume of native trapped ground water within the liners as well as submit, with justification, the proposed flow rate the book over will use. In any case the Applicant is required to notify and get the approval of the local water commissioner prior to the booking over any water or the storage of any water into these reservoirs. In all cases, water physically diverted into each reservoir must be measured and recorded as well as all water pumped out of the reservoir. Replacements Saint Wain Creek — Rural Ditch Shares L. G. Everist owns 7.4 shares of the Rural Ditch Company. Of the 7.4 shares of the Rural Ditch water, 1 share will be dedicated for this plan for 2012 and 2013. The 7.4 shares of the Rural Ditch were historically used to irrigate 215 acres of pasture grass, corn and alfalfa. The land historically irrigated by the 7.4 shares is the same land that is currently being mined at the Rinn Valley Pit. Assuming a 10% ditch loss and a 55% irrigation efficiency, the dry -year consumptive use of the 7.4 shares was determined to be 337 acre -feet. The prorated consumptive use for the 1 share is 45.5 acre -feet. The historical return flow obligation of the 1 Rural Ditch shares will be maintained by the plan. The Rural Ditch share is delivered to Saint Vrain Creek through an augmentation station near the end of the ditch. The delivery location is below the Last Chance Ditch headgate and above downstream calling water rights located on the South Platte River. The Rinn Valley permit area covers most of the area historically irrigated with the 7.4 Rural Ditch share. This area has been designated as dry -up under this SWSP and as such additional Rural Ditch shares can be used in this plan. With this Amendment the Applicant anticipates using up to 2 additional Rural Ditch Shares to run into the Rinn Valley Phase 3 Reservoir. Should the need arise, the Applicant will notify DWR in writing of any change in their intent to run more ditch water into the Rinn Valley Phase 3 Reservoir. Similar to the use of irrigation ditch credits for direct replacement, the use of irrigation ditch credits in storage will include the prorated return flows as additional replacement obligations in the SWSP accounting. L.G. Everist has fully reusable supplies stored in the Rinn Valley Phase 3 Reservoir. A total of 326 acre -feet of water was stored pursuant to a pending September 30, 1987 storage right (Case No. 05CW315) in June and July 2011. According to 05CW315, the water in storage is available for industrial and replacement purposes among other uses. This water will be pumped to Idaho Creek and delivered to Saint Vrain Creek during the winter months. The applicant shall obtain prior permission from the District 5 Water Commissioner when making releases from this reservoir. Credit will not be given to any releases not measured to the satisfaction of the Water Commissioner or Division Engineer. South Platte River— Lupton Bottom Ditch Shares L. G. Everist owns 2.25 shares of the Lupton Bottom Ditch. Of the 2.25 shares of the Lupton Bottom Ditch water, 1 share will be dedicated to this plan in 2012 and 2013. The 2.25 shares were historically used to irrigate 95 acres of corn and small vegetables. The land historically irrigated by the 2.25 shares is the same land that is currently being mined at the Ft. Lupton Pit. Assuming a 10% ditch loss and a 55% irrigation efficiency, the dry-year consumptive use of the 2.25 shares was determined to be 138 acre -feet. The prorated consumptive use and return flows for the 1 share is shown in attached Table 11. The Lupton Bottom shares will be delivered back to the South Platte River at either the augmentation station located just north of WCR 14.5 or the East Lateral Ditch into Little Dry Creek.