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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 perform 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 />0 <br />pno:~o C r'l/~ ~ c <br />o°E~P~~ P°=~~spo <br />c°~v~.~~\CHARpfo°F,~o ~ ~.' <br />o goy 2~ o~ Collin R. Fay, Colorado P No. 22438 <br />ciroU 22~~8 nab; <br />p• 4 <br />o? ° o QO <br />°o °. ° ~.o ~croaF-~ /~, /987 <br />°o~,r''°°..°°°°°°~~~o° Date <br />°~o0p(1t E\oG <br />o~~,no <br />