2011-02-24_HYDROLOGY - M1978327 - Laserfiche WebLink

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Tom Hatton Page 3 February 14, 2011 from the surface of the exposed ground water area to the Big Thompson River was measured based on the down gradient extent of the exposed ground water surface (nearest point). For purposes of this SWSP, the method used to measure the distance to estimate the lagged depletions will be accepted, however any future SWSP must measure the distance from the exposed ground water surface area to the Big Thompson River based on the centroid of the exposed ground water surface. The lagged stream depletions are estimated to total 17.3 acre-feet during the term of this approval, as shown on the attached Table 3. Replacements Replacement water for this pit will continue to be made available throughout the year from a lease of 65.0 acre-feet of fully consumable water from the City of Loveland ("Loveland"). This lease also applies to losses at another gravel pit, Wagner/Kauffman Pit #3 (M-99-069). A copy of the lease associated with the mining operation is attached to this letter. The duration of the lease is from January 1, 2010 through December 31, 2012. A 4 percent transit loss from Green Ridge Glade Reservoir to Kauffman Pit has been applied to the delivery of the replacement water. 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 Project ("C-BT") water. In the event that the City plans to use C-BT water as a replacement source, the City shall comply with the Interim Rule issued by the Northern Colorado Water Conservancy District ("Northern District") in May 2005, regarding the use of Colorado-Big Thompson ("CBT") Project water in substitute water supply plans. Prior to the use of C-BT Project water, the City 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 I(g) of the Northern District's May, 2005 Interim Rule. 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 is approved with the effective date of January 1, 2011 and shall be valid through December 31, 2011 unless otherwise revoked or modified. 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 (currently $257) no later than November 15, 2011. Your renewal request must address the issues raised in conditions #12 and 13 below. 2. Well permit no. 42901-F was obtained for this gravel pit in accordance with § 37-90-137(2) and (11), C.R.S. On April 6, 2010 the location of this permit was amended in accordance with the Policy Memorandum 93-1 to reflect the actual location of the gravel pit. 3. The total surface area of groundwater exposed at the Kauffman Pit site after December 31, 1980 must not exceed 6.3 acres resulting in 14.5 acre-feet per year of evaporative loss and the annual amount of water used for dust control at the Kauffman Pit site shall not exceed 2.5