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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 East 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 20, 1987, and completed on Sep- <br />tember 12, 1987. I certify-that the embankment and spillway were built as desigried <br />and the resulting East Buzzard sedimentation system will meet effluent limitations as <br />predicted by hydrologic modelling techniques. One minor modification, relocation of <br />the spillway from the east side of the embankment to the west side of the embank- <br />ment, was made during construction. This modification, authorized by me, was made <br />to accomodate field conditions and did not alter the hydrologic characteristics of the <br />resulting sedimentation pond. <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#II material was monitored using a nuclear density probe to <br />ensure adequate compaction. <br />Qa~s~q <br />~,.aoo ers,s°, ~~~ <br />a ~ ~.. <br />•~ O : ~\CHr19.jt ~~:o <br />a V ; ~ / ;~~4 --~ <br />;,~ i~ 224 Jg ~ ~ 7 Collin R. Fay, Colorado'PE o. 22438 <br />w : ~ •~ 0 <br />,;.. <br />~Os~-'%:AL • ~~ <br />•~.,,,~`- Date <br /> <br />