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~~ ~ • • iii iiiiiiiiniuiii <br />999 <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 Elk Dam No. 1, located in <br />Section 4, T 5 N, R 91 W, 6th PM, was inspected by me during construction. Con- <br />struction of this dam was begun on July 15, 1987, and completed on September 12, <br />1387. I certify that the embankment and spillway were built as designed and the <br />resulting Elk sedimentation system will meet effluent limitations as predicted by <br />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 />~UCVnoooo L <br />eo~~p0 RFg~~,o~ k~ <br />0 o~~°~Q\CHARpfoP~?~~ <br />o `'o ~ ? e° o Collin R. Fay, Colorado PE o. 22438 <br />o}~oc°~ 22438 S%u°a <br />° ° a <br />04 ° e co CJ~ p-o~eg ~~, /~B7 <br />00 °° o° 4.0 <br />°~css,°°°o°°• `~~~~oo° Date <br />~,o0i1 ©Lnocv <br />