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Ms. Jennifer Lindahl <br />September 16, 2010 <br />Page 2 <br />Depletions <br />This plan describes the maximum proposed water uses from September 1, 2010 <br />through August 31, 2012 for this pit. The SWSP anticipates a maximum annual depletion of <br />6.26 acre-feet for an exposed groundwater surface area of 0.16 acres. You have provided a <br />monthly breakdown of the maximum annual depletions totaling 0.37 acre-feet of evaporative <br />loss from a maximum of 0.16 acres of exposed groundwater at a settling pond and 5.89 acre- <br />feet of water losses associated with the extraction of an estimated 200,000 tons of aggregate <br />from below the water table. Dust suppression on the site will be met by water imported from <br />another location. <br />The IDS AWAS stream depletion model was used to determine the lagged depletions to <br />the Big Thompson River. The following parameters were used in the model: transmissivity (T) <br />= 225,095 gallons per day per foot, specific yield (SY) = 0.2, the distance from the Big <br />Thompson River to the edge of the alluvium = 2,290 feet, and the distance from the centroid of <br />the exposed surface water areas to the Big Thompson River is approximately 720 feet. Lagging <br />of both depletions and accretions have been accounted for at the gravel pit and the settling pond, <br />respectively. <br />Replacements <br />The operator proposes to provide replacement water for the actual operational <br />depletions from a portion of a 200 acre-foot lease agreement with the City of Loveland. This <br />25-year lease was originated in January 1998 and extends through December 31, 2022. The <br />fully consumable water that is offered by the City of Loveland includes, but is not limited to, <br />native water from the Big Thompson River basin as stored within the City's reservoir system, <br />Windy Gap Water, or any water subsequently acquired by the City. A transit loss of 1.8% will <br />be charged for the delivery of this water to the subject site. This agreement with the City <br />extends beyond the approval period of this SWSP. The monthly evaporative and operational <br />losses and proposed monthly replacement requirements for the approved year of depletions at <br />this gravel pit can be found on the attached Tables 2, 4 and 5. The City of Loveland lease is <br />also used for the Green/Croissant Pit. <br />Under the terms of the lease, replacements can be made using a variety of water owned <br />by Loveland including, but not limited to, Windy Gap reusable effluent, Loveland Storage <br />Reservoir water as decreed in case no. 82CW202A, and any water subsequently acquired by <br />the City and determined to be fully consumable. <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, 2010 through <br />August 31, 2012, 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, 2012. <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.