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Mr. Bob Condon <br />Two Rivers Rock Pit (M-03-052) <br />August 22, 2006 <br />Page 2 <br />Due to the fact that the site is set back from the river, a stream depletion model was used to <br />determine the lagged depletions to the Big Thompson River. The following parameters were used in <br />the model: transmissivity (T) = 10,000 gallons per day per foot, specific yield (SY) = 0.2 (which is <br />typical for an alluvial aquifer), the distance of the exposed ground water to the river=1000 feet. <br />Based on the indicated values, an SDF value of 20 days was computed. Thus, the lagged <br />evaporative and operational losses for this approval period are 19.08 acre-feet. Should a renewal of <br />this plan be requested, the Applicant is required to provide a comparison of estimated lagged <br />depletions using both the SDF option and the alluvial aquiferoption in theAlluvial WaterAccounting <br />System ("AWAS") mode! that was developed by the IDS Group at Colorado State University. <br />The proposed source of replacement water for this pit is a lease of excess recharge <br />accretions from the Town of Milliken ("Town"). The Town has filed for a plan for augmentation in <br />Division 1, Water Court in case no. 2002CW339. In accordance with Section 37-92-308(4}, C.R.S., <br />on March 6, 2006, the State Engineer's Office approved a substitute watersupply plan ("SWSP")for <br />the Town. The Town has generated excess recharge accretions credits pursuant to the above- <br />described SWSP. Copies of the water lease agreements for 2006 and 2007 were submitted to this <br />office on July 3, 2006. The monthly breakdown of the lagged evaporative and operational losses <br />and replacement requirements are found on the attached Table 1. <br />I hereby approve the proposed substitute water supply plan in accordance with §37-90- <br />137(11), C.R.S., subject to the following conditions: <br />1. This plan shall be valid for the period of June 1, 2006 through December 31, 2007, unless <br />otherwise revoked or modified. This plan will be extended until May 31, 2008, if a lease with <br />the Town of Milliken for the period of January 2008 though May 2008 is provided to this <br />office prior to December 31, 2007. <br />2. If this plan will not be made absolute by a water court action by the plan's expiration date, <br />a renewal request must be submitted to this office with the statutory fee (currently $217) <br />no later than November 15, 2007 or March 15, 2008, subject to the requirements of <br />condition 1 above. <br />3. Well permit no.60231-F was obtained forthe proposed use and exposed pond surface area <br />of the gravel pit, in accordance with Section §37-90-137(2) and (11), C.R.S., however since <br />no groundwater was exposed at the site in 2005, this permit expired and a new well permit <br />must be obtained for the proposed use and exposed pond surface area of the gravel pit in <br />accordance with §37-90-137(2) and (11), C.R.S. The provisions of Colorado Revised Statute <br />37-90-137(2) prohibits the issuance of a permit for a well to be located within 600 feet of any <br />existing well, unless the State Engineer finds that circumstances so warrant after a hearing <br />held in accordance with the procedural rules in 2CCR402-5. This hearing maybe waived if <br />you are able to obtain statements from the owners of all wells within 600 feet, verifying that <br />they have no objection to your use of the proposed well. Should a new well permit be denied <br />for reasons of 600 foot spacing, or any other legitimate reason, approval of this substitute <br />supply plan will be cancelled. <br />4. The maximum surface area of the groundwater exposed at this site during the term of this <br />plan shall not exceed 4 acres, resulting in a total evaporative loss of 11.88 acre-feet. <br />