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<br />Mazch 27, 2006 <br />Mr. Alex Schatz <br />Banks & Gesso <br />720 Kipling St., Suite 117 <br />Lakewood, CO 80215 <br />Dear Alex: <br /> <br />SEP 0 7 2U06 <br />Martin and Wood Water Consultants, Inc. <br />602 Park Point Drive, Suite 275, Golden, CO 80401 <br />Phone: (303) 526-2600. Fax: (303) 526-2624 <br />www. martins ndwood.com <br />Re: Western Slope Aggregates <br />Silt Gravel Pits <br />Dewatering Effects <br />Project Number: 680.1 <br />This letter reports t11~1~9p1~R~l~riguognd water modeling study conducted on behalf of <br />Western Slope Aggregates for ~i@~4~~'~gravel pits near the Town of Silt in Garfield County, <br />Colorado. This study was conducted to determine the effects of dewatering of the gravel pits on the <br />Colorado River and nearby wells. It is our understanding that these results will be used in the <br />grave] mine permit application for the Division of Minerals and Geology ("DMG"). <br />Background <br />Westem Slope Aggregates is looking to mine four gravel pits over the course of the next <br />several years on property southwest of the Town of Silt, on the south of the Colorado River (Section <br />9, Township 6 South, Range 92 West). A map of the proposed gravel pit locations is presented in <br />Figure 1. It is our understanding that Western Slope is proposing to dewater each mine cell and <br />remove the gravel with dry mining techniques. As each pit is mined, it will be completed and <br />converted to a pond before mining of successive pits commences. The proposed pits aze to be <br />constructed on a generally flat-lying flood plain of the Colorado River, which extends <br />approximately 1 mile south of the river to the elevated plateau. <br />As is required for a grave] pit-mining permit from the DMG, the effects of dewatering wells <br />within 600 feet must be determined. Banks and Gesso, LLC, has provided us with a map locating <br />these wells by permit number. These wells, identified with permit numbers, are also presented in <br />Figure 1. <br />Geology <br />The gravel pits aze to be constructed in the upper portion of the alluvium of the Colorado <br />River. Though published geologic studies of the area aze sparse, State Engineer records of wells in <br />