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COLORADO <br /> �p <br /> Division of Reclamation, / <br /> A&V Mining and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> ayle Lyman <br /> Elam Construction, Inc. <br /> 556 Struthers ave. <br /> Grand Junction, CO 81501-3826 <br /> /July 21, 2014 <br /> RE: Elam Construction, Inc. dba Sandco, Inc., Dillon Ranch Pit (112c), File No. M 987-064 <br /> Technical Revision - Monitoring plan <br /> Dear Mr. Lyman, <br /> The Division is in receipt of your request for an extension to the decision date for the <br /> technical revision application for the above site. The Division has expressed in previous <br /> letters that it has concerns related to potential impacts to private wells and the Cottonwoods <br /> in the vicinity of the site. As mentioned in previous review letters: <br /> 1. There are numerous wells located within the potential cone of depression resulting <br /> from dewatering of the pit. Although the depths of most of these wells appear to be far <br /> deeper than the drawdown expected in their locations, there are a few wells that appear to <br /> be close enough to the expected drawdown that there may be potential for impacts to the <br /> wells. Wells of specific concern are: 46320; 144732; and 244426-A. All wells within the cone <br /> of depression must be protected from potential impacts due to the dewatering operation. <br /> Please indicate how all wells, including the three cited above, wilt be protected from <br /> impacts. <br /> And, <br /> 2. Although the groundwater model appears to be an accurate estimate of the potential <br /> impacts to groundwater relative to the proposed dewatering plan, the Division requires <br /> assurance of the accuracy of the model once dewatering activities commence. Therefore the <br /> Division requires that the impacts to the groundwater be monitored to ensure that the model <br /> is an accurate depiction of the actual impacts. Please propose a monitoring plan to indicate <br /> whether groundwater is behaving as expected in the model. <br /> ov qoj , <br /> fiw �9 <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director ** * <br /> \ .1876 <br />