2008-12-23_HYDROLOGY - M2001022 - Laserfiche WebLink

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IV Ms. Cristyn R. Radabaugh Page 2 Green/Croissant M2001-022 December 23, 2008 exposed surface area in the event that the dewatering ceased. The IDS AWAS stream depletion model was used to determine the lagged depletions to the Big Thompson River. The following parameters were used in the model: transmissivity (T) = 50,000 gallons per day per foot, specific yield (SY) = 0.2, the distance from the Big Thompson River to the edge of the alluvium = 2,910 feet, and the distance from the centroid of the exposed surface water areas (mined areas, dewatering trenches, and site ponds) to the Big Thompson River is approximately 1,480 feet in 2009 and approximately 1,450 feet in 2010. Replacement The proposed source of replacement water for this pit is fully consumable effluent leased from the City of Loveland and made available at its wastewater treatment plant. Monthly replacements are calculated as total monthly depletions plus 1.85 percent transit losses from the Loveland wastewater treatment plant to the pit site. The long-term replacement requirement will be provided by the 25-year lease with the City of Loveland (the lease expires December 31, 2022). A copy of the lease is attached to this letter. Also, in a letter dated November 18, 2008 the City of Loveland indicated that the City is prepared to deliver up to 200 acre-feet in 2009 and each year throughout the lease term. The monthly depletions and replacement requirements are found on the attached Tables 2 and 3. I hereby approve the proposed substitute water supply plan in accordance with §37-90- 137(11), C.R.S. subject to the following conditions: Conditions of Approval 1. This plan shall be valid for the period of January 1, 2009 through December 31, 2010, unless otherwise revoked, modified, or superseded by decree.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 (currently $257) no later than November 15, 2010. 2. A well permit was obtained for the current use and exposed pond surface area of the gravel pit, permit no. 65308-F in accordance with §37-90-137(2) and (11), C.R.S. A new well permit must be obtained for the current use and exposed pond surface area for the Green/Croissant site since the exposed pond surface area and the use of the ground water exceed the amounts currently permitted. A well permit application (receipt no. 3635140) was submitted on November 18, 2008 and this application is pending evaluation. The provisions of Colorado Revised Statute 37-90-137(2) prohibit the issuance of a permit for a well to be located within 600 feet of any existing well, unless the state engineer finds that circumstances so warrant after a hearing held in accordance with the procedural rules in 2CCR402-5. This hearing may be waived if you are able to obtain statements from the owners of all wells within 600 feet, verifying that they have no objection to your use of the proposed well. Should a new well permit be denied for reasons of 600 foot spacing, or any other legitimate reason, approval of this substitute supply plan will be canceled. 3. The total surface area of the groundwater exposed at the Green/Croissant Pit must not exceed 30.50 acres (in 2010) resulting in a maximum annual evaporative loss of 76.86 acre-feet. 4. The annual total product mined at the Green/Croissant Pit shall not exceed 100,000 tons per year