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<br />TRAPPER MINING INC. <br />CRAIG, COLORADO <br />DAM CONSTRUCTION CERTIFICATION <br />I, Lames M. Mattem, a Registered Professional Engineer in the State of Colorado, in accordance with <br />2CCR407-2, Section 4.05.6(7), certify that Oak Dam No. 2 was constructed under my supervision. <br />Construction activities began during the 1995 construction season and were completed in lone of 1996. <br />During construction, this dam was inspected daily to insure compliance with prudent construction <br />methods. Compaction was accomplished by laying suitable material down in thin, horizontal layers with <br />Caterpillar 627 scrapers and rolling with a Caterpillar 815 compactor. Adequate moisture was provided <br />with a water truck. Compactimr and moisture contcet were monitored using an MC-2 nuclear density <br />gauge. Standard Proctor curves were developed in our lab in accordance with AASHO Standard Method <br />T99-61. <br />• Minor variations from the design were noted during the as-built survey. The attached hydrologic model <br />output for the Oak ponds demcostrates that Oak Dam No. 2 (as-built) projected flows and e8luent <br />quality meet or excced original design standards. <br />7 M. MA Rl <br />CO PE 20537 <br />G/1d~9G <br />DATE <br /> <br />