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annoring materials aze available locally, and are expected to be encountered in the initial excavation of the <br />graveling operations. A detailed survey of the bedload, size distribution and natural materials in the main stem <br />will provide guidance as to size of armoring material. We would anticipate anything larger than 2.5 feet in <br />diameter encountered in the pit will be stock piled and used in this armoring. The "inlet spillway" will be <br />maintained at the existing elevation and at a gradient into the pit minimizing velocities and erosion. <br />In addition to inlet and outlet armoring, stock piling and use of large material along the west flank (adjacent to <br />the river) can be conducted as excavation occurs in order to insure that no erosion from water flowing through <br />the pit would create a breach to the Animas River. <br />We hope this preliminary opinion provides additional guidance in the pemtitting process for the Clark Pit. <br />Please do not hesitate contacting our office should you have questions at this time. We will be available for <br />additional field analysis at appropriate time (when snow cover and high flows a the site are available for <br />observation). <br />Respectfully, <br />C .~- <br />J Tim L. Decker, C.P.G. <br />Attached: Appendix A, Figure 1, Table 1 <br />