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!~ <br />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 Johnson Dam No. 7R, lo- <br />cated in Section 27, T 6 N, R 91 W, 6th PM, was inspected by me during construc- <br />tion. This reconstruction of Johnson Dam No. 7 was begun on June 4, 1987, and <br />completed on September 12, 1987. I certify that the embankment and spillway were <br />built as designed and the resulting Johnson sedimentation system will pertorm equally <br />as well or better than the system previously in place. One minor modification, reloca- <br />tion of the spillway from the east side of the embankment to the west side of the em- <br />bankment, was made during construction. This modification, authorized by me, was <br />made to accomodate field conditions and did not alter the hydrologic characteristics <br />of the 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 fill material was monitored using a nuclear density probe to <br />ensure adequate compaction. <br />4sAp0 ~cC~AO <br />~O P.~AI1 ~/' f/f.r~ / ~ <br />gapQ-e,,...,,• 5~., <br />~O~z R\GHARU~ :F,o: - <br />s ~; J ° ~; o; Collin R. Fay, Colora b P~No. 22438 <br />:o n~ ~ <br />;~• zz4sa ~,~o <br />i <br />YA i <br />~. : ~ 4° ~croaER /C, /987 . <br />,~ . , ~. <br />~.FS•'••.... ' ~`'•'~i Date <br />~~~~NAL ~'i°a <br />'9sY ~ ~ <br /> <br />