2021-07-01_HYDROLOGY - M2015030 - Laserfiche WebLink

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Chavers Mining Resources Substitute Water Supply Plan Page 4 of 7 July 1, 2021 flows in their accounting and replace any dewatering depletions that are not offset by dewatering return flows. Replacements Out-of-priority depletions associated with the mining operation at this site and alluvial well will be replaced using fully consumable municipal return flows leased from the City of Aurora ("Aurora"). The applicant has entered into a 5-year renewable lease with Aurora signed August 24, 2015. A copy of this lease has been provided by the applicant and is attached. Under the lease, water will be delivered to the outfall of the Robert W. Hite Treatment Facility (aka Metro Sewer, WDID 0200700) located on the South Platte River. The Hite Treatment Facility is located approximately 22 miles upstream of the Chavers Mine Resources site. The delivery schedule includes a transit loss of 0.5% per mile (11% for 22 miles) during the months of April through October and 0.25% per mile (5.5% for 22 miles) during the months of November through March. Conveyance loss for delivery of augmentation water to the South Platte River is subject to assessment and modification as determined by the Division Engineer. Any changes to the assessed conveyance loss will be communicated to the Division 1 Call List via email. Aurora may alternatively deliver water at other points along a reach of the South Platte River beginning at or below the Hite Treatment Facility extending downstream to a point at or above the location where the South Platte crosses the south section line of the E '/z of the SW '/a of Section 18, T1 N, R66W, 6tn P.M. The Applicant must notify the Water Commissioner at least 48 hours prior to making replacement deliveries at a location other than the Hite Treatment Facility. Under the lease signed August 24, 2015, 10.16 acre-feet are scheduled to be delivered from the City of Aurora lease from August 1, 2021 through December 31, 2021. Since under the current delivery schedule not all depletions for the period of this SWSP are covered, the Applicant will use excess credits from the Aurora lease water used at Asphalt Specialties Speer Mining Resources Pit (DRMS M1983-176), dated September 10, 2020. Mining at the Speer Mining Resources has been completed and replacement obligations are near steady-state conditions therefore additional replacement water from the September 10, 2020 lease with Aurora is available for replacement at the Chavers Mining Resources site. An SWSP for the Speer Mining Resources was approved on December 1, 2020 and is valid until December 31, 2021. The total replacement requirement (lagged depletions and transit losses) at Speer Mining Resources site are estimated at 7.15 acre-feet for August 2021 through July 2022. The attached Table 5 shows the delivery schedule for both sites for the period of August 2021 through July 2022. According to the requirement of the previous SWSP approval, the two leases with Aurora were amended to reflect the new delivery schedule for each of the two mine sites and copies of the two amended leases were provided to SEO and are attached to this letter. Under the September 10, 2020 lease for the Speer Mining Resources site, a total of 52 acre-feet of replacement water is scheduled to be delivered during this SWSP period. This amount is adequate to replace both the projected depletions for the Speer Mining Resources site and the depletions from the Chavers Mining Resource site for the period of August 2021 through July 2022 that are not replaced by the August 24, 2015 lease. Conditions of Approval This SWSP is hereby approved 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, 2021 through July 31, 2022, unless otherwise revoked, or superseded by decree. If this plan is not decreed in water court by the SWSP expiration date, a renewal request must be submitted to this office with the statutory fee of $257 no later than November 1, 2021. If a renewal request is received after the expiration date of this plan, it may be considered a request for a new SWSP and the $1,593 filing fee will apply.