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~! Trapper Mining Inc. <br />Craig, Colorado <br />DAM CONSTRUCTION CERTIFICATION <br />I, Collin R. Fay, a Registered Professional Engineer in the State of Colorado, in ac- <br />cordance with 2 CCR 407-2, Section 4.05.6(7), certify that West Buuard Dam No. 3, <br />located in Section 29, T 6 N, R 91 W, 6th PM, was inspected by me during construc- <br />tion. Construction of this dam was begun on July 21, 1987, and completed on Sep- <br />tember 12, 1987. I certify that the embankment and spillway were built as designed <br />and the resulting West Buzzard sedimentation system will meet effluent limitations as <br />predicted by hydrologic modelling techniques. <br />During construction, this dam was visually inspected daily to insure compliance with <br />prudent construction methods. Compaction was accomplished by laying fill material <br />in thin horizontal layers and compacting with a vibratory roller compactor, a dozer, <br />andlor scrapers. Standard Proctor densities were determined in our lab using <br />methods outlined in AASHO Standard Method T99-61. Compacted density and mois- <br />ture content of the placed fill material was monitored using a nuclear density probe to <br />ensure adequate compaction. //"//~J~ n <br />0 a00ig1 /./l/ ~ ~Tj'// <br />A 4I <br />O~Q~.S~~~.. EC~J'jt. <br />a ~o~~\\~~\CIIARp f^ ~"A* - <br />~'T;°~ Collin R. Fay, Colorado P No. 22438 <br />~ ~'" 22438 ~; =~ i <br />NA : ~ ~ // O <br />`.fs ~•......•N.~'~°~ Date <br />:~Nal E i ~ <br />•.~.• <br />i <br />