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<br />CERTIFICATION <br />I have accomplished an office review of culverts 1 through 5, #7N Escape Shaft Road, <br />Cyprus Yampa Valley Coal, SEDCAD+ design analysis. Descriptive field information and <br />configuration was provided by Cathy Begej, Greystone. Based on this information, the <br />analyses are valid to the best of my knowledge. <br /> <br />• <br />~f~N iJ. Gr/~ <br />Byron G. Walker, P.E. <br />Colorado Registration Number: 18378 <br /> <br />• <br />