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:, <br /> <br />RFr.FivED <br />JUL 12 1996 <br />TRAPPER MINING INC. Division of Minerals & Geology <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. 1 was constructed under my supervision. <br />Construction activities took place during the months of May and June, 1996. <br />Durirrg 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 S 15 compactor. Adequate moisture was provided <br />with a water truck. Compaction and moisture content 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 />1'991. <br />• Minor variations from the design were noted during the as-built survey. The attached hydrologic model <br />output for the Oak ponds demonstrates that Oak Dam No. 1 (as-buih) projected flows and eIDueut <br />quality meet or exceed original design standards. <br />J S M. MATTERN ~~ <br />CO PE 20537 <br />G/zal~c <br />DATE <br />• <br />