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:~ <br />~i <br />Trapper Mining Inc. <br />Craig, Colorado <br />®AM 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 Buzzard Dam No. 1, <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 20, 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 />and/or scrapers. Standard Proctor densities were determined in our lab using <br />methods outlined in AASHO Standard Method T99~1. Compacted density and mois- <br />ture content of the placed fill material was monitored using a nuclear density probe to <br />ensure adequate compaction. <br />oo~p0 @F~~~o <br />o v~e•°R\C6tARp°~f~~ ~ <br />o V~o ~a `r0° o f <br />0 0~ ~,o~a <br />~~o`~' 22438 ~awo <br />~-iGG <br />Collin R. Fay, Colorado is o. 22438 <br />O~ ~ ndEi~ /~, /987 <br />Date <br />