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Cheryl Signs, P.E. <br />Durham Pit, DRMS- 1978 -056 <br />Page 2 <br />August 3, 2011 <br />is not completely covered by ice. <br />Computation of the net evaporation during any time that the 3 -acre pond is not completely <br />covered by ice shall be determined as the pro -rata amount of the monthly gross evaporation rate <br />distribution amount identified in the State Engineer's General Guidelines for Substitute Supply Plans for <br />Sand and Gravel Pits, subtracting the pro -rata amount of the effective precipitation for that period. <br />The monthly depletions to the Saint Vrain Creek were lagged from the 3 -acre pond using the <br />AWAS program developed by the IDS Group at Colorado State University. The parameters used in <br />the model were an estimated distance from the exposed water surface area to the Saint Vrain Creek <br />(X) of 240 feet, an estimated distance from the site to the no flow aquifer boundary (W, measured <br />perpendicular to the point of impact) of 3,500 feet, an aquifer transmissivity (T) of 100,000 gallons per <br />day per foot, and a specific yield (S) of 0.2. According to the Applicant, the distance from the <br />surface of the exposed ground water area to the Saint Vrain Creek was measured based on the <br />down gradient extent of the exposed ground water surface (nearest point). For purposes of <br />this SWSP, the method used to measure the distance to estimate the lagged depletions will be <br />accepted, however any future SWSP must measure the distance from the exposed ground <br />water surface area to the Saint Vrain Creek based on the centroid of the exposed ground water <br />surface. <br />The net annual depletions from the Durham Pit site and the Dakolios Pit are 57.23 acre -feet 49.56 <br />acre -feet for the Durham Pit and 7.69 acre -feet for the Dakollios Pit. <br />Replacement <br />The source of replacement for the additional evaporation depletions is the water diverted <br />through the Rural Ditch for storage in the 112 Reservoir and the Dakolios Reservoir over the extended <br />free river period that started in September 2009 and continued through the beginning of June 2010.. <br />The water in storage is primarily junior water rights that were decreed in case no. 2001 CW274. A <br />detailed explanation of this water is found in the original SWSP approved on February 14, 2011. <br />The monthly depletions and replacement requirements are found on the attached revised Table II. <br />Conditions of Approval <br />I hereby approve the proposed amended substitute water supply plan in accordance with <br />C.R.S. § 37 -90- 137(11), subject to the following conditions: <br />1. All conditions listed in the original SWSP approved for the Durham Pit on February 14, 2011 remain <br />in effect except as modified herein. A copy of the original approval is attached for your reference. <br />This amendment does not alter the approval period of this plan, which is January 1, 2011 through <br />December 31, 2012 unless otherwise revoked or modified. If this plan will not be made absolute by a <br />water court action by the plan's expiration date, a renewal request must be submitted to this office <br />with the statutory fee (currently $257) no later than November 15, 2012. <br />2. A well permit must be obtained for the current use and exposed surface area of the Dakolios Pit in <br />accordance with § 37 -90- 137(2) and (11), C.R.S. in conjunction with this plan. The provisions of <br />Colorado Revised Statute 37 -90- 137(2) prohibits the issuance of a permit for a well to be located <br />within 600 feet of any existing well, unless the State Engineer finds that circumstances so warrant <br />after a hearing held in accordance with the procedural rules in 2CCR402 -5. This hearing may be <br />