2013-01-02_HYDROLOGY - M2005033 - Laserfiche WebLink

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Mr. Peter Wayland Gardels SWSP December 31, 2012 AI.2 Page 2 of 5 backfillinq of the pit. By the next SWSP renewal the Applicant must provide information to this office that documents the sufficiency of such a bond, and if found to be insufficient what steps they are taking with DRMS to bring the site into compliance with the long term augmentation requirements. Depletions The anticipated net depletion for this plan is 26.71 acre -feet per year for up to 9.39 acres of exposed ground water. The ground water is within Pond 1 and Pond 2 with surface areas of 7.24 acres and 2.15 acres, respectively. Gross evaporation at this site is taken from NOAA TR -33 Map 3 and is estimated to be 41 inches per year with an effective precipitation amount of 10.58 inches. The lagged depletions from evaporation at the Gardels Pit were estimated by the Applicant's consultant using the Integrated Decision Support group's Alluvial Water Accounting System (IDS AWAS) stream depletion model. The aquifer characteristics used in the model are: transmissivity (T) = 56,100 gallons per day per foot; specific yield (SY) = 0.2; the distance from the centroid of the exposed ground water to the stream = 444 feet (Pond 1) and 275 feet (Pond 2); and the location of the parallel impermeable boundary was estimated to be 1,400 feet from the stream. Replacements Replacement water for this pit will be made available throughout the year from a lease of fully consumable water from Loveland's Water and Power Department. A copy of the lease associated with the mining operation was provided to the State Engineer's Office with the SWSP request and is attached to this letter. The duration of the lease is for a term of twenty - five years ending on December 31, 2022. Under the terms of the lease, replacements can be made using a variety of water owned by Loveland including, but not limited to, Windy Gap reusable effluent, Loveland Storage Reservoir water as decreed in case no. 82CW202A, and Colorado Big Thompson ( "C -BT ") Project water. In the event that Loveland plans to use C -BT water as a replacement source, Loveland shall comply with the Interim Rule issued by the Northern Colorado Water Conservancy District ( "Northern District ") in May 2005, regarding the use of C -BT Project water in substitute water supply plans. Prior to the use of C -BT Project water, Loveland is required to notify this office, the division engineer and the water commissioner of the amount of C -BT Project water dedicated to this plan and provide a copy of the Northern District's approval letter as required by paragraph 1(g) of the Northern District's May, 2005 Interim Rule. The monthly depletions and replacement requirements are found on the attached Table 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 SWSP shall be valid for the period of October 1, 2012 through October 31, 2014, unless otherwise revoked, modified, or superceded by decree. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee by September 15, 2014. 2. A well permit must be obtained for this pit in accordance with § 37 -90- 137(2) and (11), C.R.S. Applicant is required to submit the permit application within 30 -days of