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Ms. Jennifer Lindahl <br />August 10, 2009 <br />Page 2 <br /> <br />The pit is located greater than 100 feet from the Big Thompson River and the resulting <br />depletions have been lagged to account for the delayed effects on the river system. The IDS <br />AWAS stream depletion model was used to determine the lagged depletions to the Big <br />Thompson River.. The following parameters were used in the model: transmissivity (T) = 225,095 <br />gallons per day per foot, specific yield (SY) = 0.2, the distance from the Big Thompson River to <br />the edge of the alluvium = 2,290 feet, and the distance from the centroid of the exposed surface <br />water areas to the Big Thompson River is approximately 720 feet. Lagging of both depletions and <br />accretions have been accounted for at the gravel pit and the settling pond, respectively. <br />Replacements <br />The operator proposes to provide replacement water for the actual operational depletions <br />from a portion of a 200 acre-foot lease agreement with the City of Loveland. This 25-year lease <br />was originated in January 1998 and extends through December 31, 2022. The fully consumable <br />water that is offered by the City of Loveland includes, but is not limited to, native water from the <br />Big Thompson River basin as stored within the City's reservoir system, Windy Gap Water, or any <br />water subsequently acquired by the City. A transit loss of 1.8% will be charged for the delivery of <br />this water to the subject site. This agreement with the City extends beyond the approval period <br />of this SWSP. The monthly evaporative and operational losses and proposed monthly <br />replacement requirements for the approved year of depletions at this gravel pit can be found on <br />the attached Tables 2, 4 and 5. The City of Loveland lease is also used for the Green/Croissant <br />Pit and Baer Pit. <br />I hereby approve the proposed substitute water supply plan in accordance with C.R.S. § <br />37-90-137(11), subject to the following conditions: <br />Conditions of Approval <br />1. This substitute water supply plan shall be valid for the period of September 1, 2009 through <br />August 31, 2010, unless otherwise revoked, modified, or superseded by decree. If this plan will <br />not be made absolute by a water court action by the plan's expiration date, a renewal request <br />must be submitted to this office with the statutory fee (currently $257) no later than July 16, <br />2010. <br />2. Well permit no. 66399-F was obtained for the current use and exposed pond surface area of <br />the gravel pit pond in accordance with §37-90-137(2) and (11), C.R.S. <br />3. The total surface area of the groundwater exposed at the Bokelman/Walters Pit must not exceed <br />0.16 acres resulting in a maximum annual evaporative loss of 0.37 acre-feet. <br />4. The annual total product mined at the Bokelman/Walters Pit shall not exceed 200,000 tons per <br />year resulting in 5.89 acre-feet of water lost with the mined aggregate. <br />5. Total consumption at the Bokelman/Walters Pit must not exceed these aforementioned amounts <br />unless an amendment is made to this plan. <br />6. The existing lease of the replacement water is evidenced by an agreement with the City of <br />Loveland dated January 13, 1998. A copy of the lease agreement was furnished to this office <br />with this plan request. All replacement water must be concurrent with depletions in quantity, <br />timing and location. <br />7. Approval of this plan is for the purposes as stated herein. This office must first approve any <br />additional uses for which the water may be used. Any future plan that allows credit for historical