2012-02-16_HYDROLOGY - M2000041 - Laserfiche WebLink

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Mark McLean Page 2 February 16, 2012 Glover Analysis data provided in the cover letter of the submittal include the following: Your stream depletion analysis is also attached (see attached Table 3 (Revised)) providing a monthly distribution of the steam depletion. You have calculated total stream depletions to be 31.17 acre -feet for the April 1, 2011 through March 31, 2012 -plan year. Post -2011 plan year depletions are projected to be 8.81 acre -feet. REPLACEMENT • A distance to the river of 2,400 feet • A distance of impermeable boundary of 5,000 ft (approximate distance to the Excelsior Ditch) • Transmissivity of 100,000 gpd /ft • Storage coefficient of 0.2 During April 2011 through March 2012, leased fully consumable replacement credits from the Arkansas Groundwater Users Association (AGUA), available pursuant to a 2 -year lease, will be provided to cover mining depletions. The credits will be generated through the delivery of fully consumable water available to AGUA from the Board of Water Works of Pueblo, from the City of Aurora, or from the Pueblo West Metropolitan District, to AGUA's Excelsior Recharge Ponds located immediately west of Chico Creek. The lease provides that AGUA will deliver up to 40 acre -feet to the Arkansas River by means of recharge ponds on the Excelsior Ditch. Attached Table 4 (Revised) shows the proposed accounting forms and Attachment A shows the monthly replacement schedule for the 2011 plan year. POST PLAN DEPLETIONS Projected post plan depletions are shown at the bottom of attached Table 5 (Revised). Projected post -2011 plan year depletions are 8.81 acre -feet. The replacement water lease agreement with AGUA provides a means to supply replacement water for 2011 post plan depletions, as shown in Attachment A. The State and Division Engineers have reviewed the plan and the adequacy of each source of water provided for use as augmentation water, including, where necessary, the historical consumptive use of each water right, and return flows from diversion of waters imported into the Arkansas River Basin or other fully consumable waters proposed for use as augmentation water. CONDITIONS OF APPROVAL This substitute water supply plan is hereby approved pursuant to Section 37 -90- 137(11), C.R.S., subject to the following conditions: 1. This current plan shall be valid through March 31, 2012, unless otherwise revoked or modified. 2. Active mining of the site shall not exceed 50 acres unless an amendment to this plan has been approved. 3. The mined cell must be maintained in a de- watered state to the extent that the exposed water surface area does not exceed a total of 5.5 acres including all ponds, collection areas, dewatering trenches, and return trenches.