2023-02-16_HYDROLOGY - M2000158 - Laserfiche WebLink

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David M. Heintz S &t H Mine SWSP February 16, 2023 Page 4 of 11 to the river. Therefore, no transit losses will be applied and there will be no interviewing water rights to be injured. The District 2 Water Commissioner approved the diversion of South Platte River water into Milliken Reservoir during periods of free river in April 2016, December 2016, January 2017, May 2017, June 2017, September 2017, October 2017, May 2018, June 2018, and September 2018. The necessary measurement and recording devices for pumping water into the river were approved by the water commissioner on August 18, 2014. As of February 1, 2023 the current water in storage in Milliken Reservoir is 745 acre-feet. Heaton Reservoir Storage (WDID 0504089) Heaton Reservoir (WDID 0504089) is located in Section 9, T2N, R68W, 6th P.M. Water stored under the right decreed in case no. 2001CW193 is delivered to the reservoir through the Rural Ditch (WDID 0600551). The date of appropriation for the Heaton Reservoir storage right is October 26, 2001 for 680 acre-feet, conditional, with uses that include, among others, augmentation and replacement, subject to the right to fill and refill as described in case no. 2001CW193. Replacement water will be pumped from Heaton Reservoir directly into the St. Vrain River just downstream of the confluence with Boulder Creek. The Applicant would have to obtain permission from the District 5 water commissioner to verify the Heaton Reservoir water can make it past any dry up locations between the release location and the confluence of the St. Vrain River and the South Platte River. Any Heaton Reservoir water used to make replacements for the S&tG Mine will be assessed a transit loss based on 15 stream miles. Transit loss is therefore currently 7.5 percent (0.5 percent per mile) but is subject to assessment and modification as determined by the water commissioner or division engineer. Greeley 35'Avenue Reservoir Storage (WDID 0303844) The Greeley 35th Avenue Reservoir ("Reservoir") is a lined Reservoir, located in Section 35, Township 6 North, Range 66 West of the 61h P.M. The reservoir was decreed for storage in Case No. 98CW476. In January 2018 MMM began filling the Reservoir under free river conditions and continued in 2019 and 2020. In order to use the stored water for replacement purposes the water will be pumped from the Reservoir directly to the Cache La Poudre River at the westernmost border of the Greeley 35th Avenue Pit (M1977-036). Pumping from the Reservoir may only be used for replacement of depletions at the S&tG Mine if the calling water right is downstream of the confluence of the Cache La Poudre River and the South Platte River and intervening water rights between the SFIG Mine and the Cache La Poudre River would not otherwise be injured by the downstream replacement. Prior to using the Reservoir for replacement purposes under this SWSP, approval from the District 2 and District 3 water commissioners must first be obtained. Deliveries of replacement water from the Reservoir are subject to transit loss from the point of release to the confluence of the Cache La Poudre River and the South Platte River. Conveyance loss for delivery of augmentation water is subject to assessment and modification as determined by the water commissioner or division engineer. Prior to the use of the Greeley 35th Avenue Reservoir water, the Applicant is required to notify the water commissioner and obtain the water commissioner's approval at least 48 hours prior to use, or less if allowed by the water commissioner. In addition, to verify the amount of free river water in storage in the Greeley 35th Avenue Reservoir the applicant must provide monthly reservoir accounting and the accounting must be