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Ms. Michelle Cunico Johnson, P.E. Ae; Martin and Wood Water Consultants, Inc. 538 Commons Drive Golden, CO 80401 Re: St. Barbara Sand and Gravel Mine, Substitute Water Si,ipply_Plar DRMS Permit No4- 2004 -013 Section 1, T21 S, R63W, and Section 6, T21 S, R62W, 6th P.M. Water Division 2, Water District 14 Approval Period: January 1, 2013 — December 31, 2014 Contact Phone Number for Ms. Johnson - 303 - 526 -2624 Dear Ms. Johnson: PLAN OPERATION DEPARTMENT OF NATURAL RESOURCES DIVISION OF WATER RESOURCES December 12, 2012 Office of the State Engineer"' 1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303 - 866 -3581 • Fax: 303 - 866 -3589 www.water.state.co.us John W. Hickenlooper Governor Mike King Executive Director Dick Wolfe, P.E. Director /State Engineer RECEIVED C 122012 Oivision of Reclamation, Mining & Safety We have received your July 31, 2012 letter requesting the renewal of a substitute water supply plan ( "SWSP ") in accordance with 37 -90- 137(11) C.R.S. for a sand and gravel pit to be operated by the applicant, Trans Colorado Concrete (a division of Pete Lien & Sons, Inc.). The most recent SWSP approval letter was dated May 20, 2011. The mine is permitted with the Division of Reclamation, Mining, and Safety under File No. M- 2004 -013. The $257 renewal fee has been accepted with receipt no. 3656405. The St. Barbara Sand and Gravel Mine is located in Section 1, Township 21 South, Range 63 West of the P.M. and Section 6, Township 21 South, Range 62 West of the 6 P.M. in Pueblo County. Mining at the St. Barbara Sand and Gravel Mine is projected to continue for approximately 25 years. However, at this time it is uncertain whether mining at the site will occur over the approval period. Therefore, two scenarios were considered; Scenario A assumes that mining will occur over the approval period and Scenario B assumes that mining will not occur over the approval period. The maximum exposed water surface area in the five ponds located on the property is currently at 7.46 acres (1.34 acres -pond 1, 1.80 acres -pond 2, 2.04 acres -pond 3, 0.90 acres -pond 4 and 1.38 acres -pond 5). This is the total exposed surface area during all months when mining is not in progress. Under Scenario A, Pond 5 will be actively mined during the months of June and July only. Pond 5 will be dewatered via a dewatering trench when the cell is being actively mined. The dewatering trench is 3,800 feet in length with an average width of 5 feet for a total exposed water surface area of 0.44 acres. Therefore when mining is in progress 6.52 acres is exposed in ponds 1, 2, 3 and 4 and the dewatering trench. Operational losses will occur due to water retained in the mined product and water used for dust suppression. Under Scenario B, there will be no mining on this site during the approval period and evaporation will occur from exposure of a total of 7.46 acres of water in four settling and wash ponds and in the mined cell for the entirety of the approval period. No operational losses will occur under Scenario B.