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r <br />TRAPPER MINING INC. <br />CRAIG, COLORADO <br />J~/~~ ~' , <br />e <br />! V°•~ <br />~~lg8 ~ lgg2 <br />Ori•;`, <br />LtINE,c,~CS 3~ Z~i;r C;r.;~: <br />DAM CONSTRUCTION CERTIFICATION <br />I, James M. Mattern, a Registered Professional Engineer in the State of Colorado, in accordance with <br />2CCR407-2, Section 4.05.6(7), certify that the rebuild of Johnson Dam No. 10 was inspected by me. <br />Construction activities commenced on June 9, 1992 and were completed by July 10, 1992. <br />During construction, the dam was inspected daily to insure compliance with prudent construction methods. <br />Compaction was accomplished by laying fill in thin layers and compacting with a Rex compactor working <br />with a water truck. Compaction was checked using the sand cone method and the Standard Proctor density <br />determined using AASHO Standard Method T99-61. Junnson Dam No. 10 was reconstructed as designed. <br />M.. MA! F <br />~1~~~f°F.~'`STERfu Mal[Crn <br />~ C~Jofra o PE No. 20537 <br />9 20537 W' <br />iv zrQ <br />'~~ ~^` V <br />2 ~ <br />OF GD ate <br />JMM/mg/7-?3-92 <br />ENG/DM1JDlU <br />