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i <br />DEPARTMENT OF NATURAL RESOURCES P?, osz? <br />DIVISION OF WATER RESOURCES <br />September 22, 2008 <br />Ms. Kimberly K. Frick <br />?(? Applegate Group, Inc. <br />1499 West 120t Avenue, Suite 200 <br />Denver, CO 80234-2759 <br />Bill Ritter, Jr <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Dick Wolfe, P.E. <br />Director <br />RE: WW Farms Expapsi'on, Substitute Water Supply n (WDID No. 0303014) <br />DRMS File No! -99-098 <br />Sections 29 & 33, T6N, R66W, 6th P.M. <br />Water Division 1, Water District 3, Weld County RECEIVED <br />Approval Period: January 1, 2009 through December 31, 2009 <br />Contact Phone Number for Ms. Kimberly K. Frick: 303-452-6611 $ P 2 3 1008 <br />Dear Ms. Frick: Division of Keaamaiim, <br />Mining and Safety <br />This letter is in response to the application submitted in April 2008 requesting a substitute <br />water supply plan (SWSP) for a sand and gravel pit to be operated by Aggregate Industries-WCR, Inc. <br />("Applicant") in accordance with Section §37-90-137(11), C.R.S. The applicant shall be responsible for <br />compliance with this plan, but the State Engineer's Office may also pursue the landowner for eventual <br />compliance. The required fee of $1,593 for the substitute water supply plan has been paid. <br />Plan Operations <br />This plan seeks to replace depletions resulting from the mining at the W.W. Farms Expansion <br />Pit ("Gravel Pit"). The depletions that result from the proposed dry-mining operation include <br />evaporation, dust control, and water lost in mined product. The Applicant proposes to construct <br />dewatering trenches to allow for dry-mining and to reduce the evaporative losses associated with the <br />operation. During mining, a total of up to 1 acre of groundwater in the dewatering trenches may be <br />exposed within the permit area including all exposed water surfaces. The dewatered water will be <br />discharge through a drainage swale directly back to the Cache La Poudre River. <br />Depletions <br />This plan describes the proposed water uses from January 1, 2009 through December 31, 2009. <br />The proposed plan anticipates a maximum year depletion of 19.60 acre-feet from an exposed <br />groundwater surface area of 1-acre in the dewatering trenches. The IDS AWAS stream depletion <br />model was used to determine the lagged depletions to the Cache La Poudre River. The following <br />parameters were used in the model: transmissivity (T) = 117,000 gallons per day per foot, specific yield <br />(SY) = 0.2, the distance from the Cache La Poudre River to the edge of the alluvium = 8,750 feet, and <br />the distance from the centroid of the exposed surface water areas to the Cache La Poudre River is <br />approximately 700 feet. You have provided a monthly breakdown of the annual depletions at this site <br />in your attached Table 2. The table shows that during the period of January through December 2009, <br />the total depletions are estimated to be 19.6 acre-feet corresponding to 2.88 acre-feet of evaporative <br />loss from an exposed water surface of 1-acre, 14.72 acre-feet of water lost with mining of 500,000 tons <br />Office of the State Engineer <br />1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-3581 • Fax: 303-866-3589 <br />www.water.state.co.us