2013-02-15_HYDROLOGY - M2001005 - Laserfiche WebLink

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Mr. Paul Bruss Page 3 February 13, 2013 POST PLAN DEPLETIONS Should the dewatering of the Phase 2 pit cease, Transit Mix shall dedicate the 60 shares of Twin Lakes Reservoir water to this plan. These shares along with the historical consumptive use credit will provide adequate replacement water to cover 35 acres of potentially exposed ground water. CONDITIONS OF APPROVAL 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. In accordance with C.R.S. § 25 -8- 202(7) and Senate Bill 89 -181 Rules and Regulations adopted on February 4, 1992, the state engineer has determined that subject to the terms and conditions below, the replacement supply is of a quality to meet the requirements of use to senior appropriators. This substitute water supply plan is hereby approved pursuant to C.R.S. § 37- 90- 137(11), subject to the following conditions: 1. This current plan shall be valid through January 31, 2015, unless otherwise revoked or modified. 2. Approval of this plan is for the purposes as stated herein. Any additional uses of this water must first be approved by this office. Any future additional historic consumptive use credit given (e.g., agricultural water transfer) for this site must consider all previous credits given. 3. The lagged depletions associated with this mining operation must not exceed 114.12 acre -feet during the period February 1, 2013 — January 31, 2014 and 130.62 acre -feet during the period February 1, 2014 — January 31, 2015. Documentation of pond sizes may be required by the Division Engineer in the form of an aerial photo evaluation or survey by a Professional Land Surveyor during the plan year or in years covered by subsequent renewals of this plan. 4. All diversions, including dust suppression, must be measured in a manner acceptable to the division engineer and in accordance with the "Amendments to Rules Governing the Measurement of Tributary Ground Water Diversions Located in the Arkansas River Basin ". 5. Dewatering at this site will produce delayed depletions to the stream system. As long as the pit is continuously dewatered, the water returned to the stream system should be adequate to offset the depletions. However, once dewatering at the site ceases, the delayed depletions must be addressed. At least three years prior to completion of mining, a plan must be submitted that specifies how the post pumping dewatering depletions (including refilling of the pit with ground water) will be replaced in time, place and amount. The Applicant is hereby notified that if dewatering of the mined cell occurs only during the summer months with the pit allowed to fill during the winter months, then depletions to the stream as a result of refilling of the pit must be addressed as outlined by Guideline 14 of the April 1, 2011 General Guidelines for Substitute Water Supply Plans for Sand and Gravel Pits.