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Michelle L. Hatcher March 6, 2007 Page 2 Depletions The total exposed ground water surface at the site will be 1.5 acres, consisting of 0.5 acres exposed in the dewatering trenches and 1 acre exposed in the dewatering recharge pond. The annual depletions resulting from evaporation from the 1.5 acres of exposed ground water surface is 4 acre-feet. The plan anticipates that the Pit will be mined during the period of February 2007 through November 2007. During that period 1.0 acre-foot of water will be used for dust suppression and 25.76 acre-feet of water will be lost in 875,000 tons of mined aggregate. The annual evaporation and operation losses are shown in attached Tables 1 and 2. The mining operation is located greater than 100 feet from St. Vrain Creek. As a result, a stream depletion analysis using Glover techniques has been performed as a means to assess the lagged depletions to St. Vrain Creek resulting from the proposed operation of the Camenish Borrow Pit. The Glover analysis assumes a distance from the well to the stream of 11,400 feet, a transmissivity of 50,000 gpolft, a specific yield of 0.2 and a no-flow Boundary of 13,500 feet. The resulting lagged depletions are shown in attached table 3. Replacements The proposed source of replacement for this pit is fully consumable water leased from the St. Vrain Left Hand Water Conservancy District. The lease is adequate to cover the lagged depletions that accrue to the stream through December 31, 2007. Conditions of Approval I approve the proposed substitute water supply plan in accordance with Section 37-90- 137(11), C.R.S., subject to the following conditions: This SWSP shall be valid for the period of February 1, 2007 through December 31, 2007, unless otherwise revoked, modified, or superseded by decree. Approval of this plan will be automatically extended through December 31, 2008 if a lease with SVLH for at least 2.08 acre-feet of replacement water in 2008 is submitted to the State Engineer's office and approved prior to December 31, 2007. Approval of this plan will be automatically extended through January 31, 2009 if a lease with SVLH for at least 0.28 acre-feet of replacement water in January 2009 is submitted to the State Engineer's office and approved prior to December 31, 2008. 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) by November 1, 2007 (November 1, 2008 if extended). 2. The Applicant originally requested that they be allowed to discharge the dewatering water into the Godding Ditch. The Applicant must discharge the dewatering water into the proposed recharge pond and shall not discharge the dewatering water into the Godding Ditch or any other location during this plan period.