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DEPARTMENT OF NATURAL RESOURCES rn r?DIVISION OF WATER RESOURCES <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />Dick Wolfe, P.E. <br />July 2, 2009 Director/State Engineer <br />Mr. Jacob Bauer <br />Martin and Wood Water Consultants, Inc. <br />602 Park Point Drive, Suite 275 <br />Golden, CO 80401 <br />Re: St. Barbara Sand and Grave7M' e, Substitute Water Supply Plan <br />DRMS File No. M-2004-013 - <br />Section 1, T21S, R63W, and Section 6, T21S, R62W, 6th P.M. <br />Water Division 2, Water District 14 RE VF'r <br />Approval Period: January 1, 2009 - December 31, 2010 ZL Z 0n9 <br />JUL 0 <br />Dear Mr. Bauer: (:vision or rceuarnauofI, <br />Mining and Safety <br />We have received your December 30, 2008 and January 21, 2009 letters requesting the <br />renewal of a substitute water supply plan (SWSP) for a sand and gravel pit to be operated by the <br />applicant, Trans Colorado Concrete (a division of Pete Lien & Sons, Inc.). Updated engineering <br />has been provided in support of this request. The mine is permitted with the Division of <br />Reclamation, Mining, and Safety under File No. M-2004-013. The $257 renewal fee has been <br />accepted with receipt no. 3636047. <br />See condition of approval no. 7 for actions that must be taken by the Applicant before <br />any subsequent SWSP renewal for this pit may be approved. <br />PLAN OPERATION <br />Mining at the St. Barbara Sand and Gravel Mine is projected to continue for <br />approximately 25 years. There will be one four-to-five acre cell to be mined during the months of <br />June and July only. The cell will be dewatered via a dewatering trench when the cell is being <br />actively mined. Operational losses will occur due to water retained in the mined product and . <br />water used for dust suppression. Total estimated annual aggregate production is 25,000 tons <br />per year. The total annual water consumption for dust suppression is estimated at 0.56 acre- <br />feet for both 2009 and 2010. Evaporation will occur from exposure of a total of 7.46 acres of <br />water in four settling and wash ponds and in the mined cell for the ten months when it is not <br />actively being mined. For the two months when the cell is actively being mined, evaporation will <br />occur from a total of 6.52 acres of water in the four settling and wash ponds and a dewatering <br />trench. The settling and wash ponds are 1.34, 1.80, 2.04, and 0.90 acres in size. The pond <br />formed in the mined cell while it is not dewatered is 1.38 acres in size. The dewatering trench is <br />3,800 feet in length with an average width of 5 feet for a total exposed water surface area of 0.44 <br />acres. Your attached Table 1 shows the site net evaporation calculations (25.23 acre-feet) and <br />water consumed by site operations (1.30 acre-feet). Effective precipitation credit was applied to <br />Office of the Sta" to Engineer <br />1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303-866-35810 Fax: 303-866-3589 <br />www.waterstate.co.us