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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 Buzzard Dam No. 2, <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 />and/or 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. <br />•jO~~v4~ <br />ra~a~0 RFg~~,l+ <br />~ ~~~ \~4\CNARpfo~~".p<!o <br />.v._~ 2~0 <br />e ~t `O q: <br />22438 <. ~ a <br />~~ ~ <br />a-o . <br />• QO <br />.O ~ ; ~s <br />Collin R. Fay, Colorado PEN .22438 <br />DCTD$Ex, ~Gi /987 <br />Date <br /> <br />