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<br />TRAPPER MINING INC. <br />CRAIG, COLORADO <br />DAA4 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 Johnson Dam #9 was inspected by me during reconstruction. <br />Activity began µ~th excavation for removal o(the drainpipe/standpipe on September 4, 1991 and ended with <br />placement of erosion control materials in the new channel-type spillway on October 3, 1991. The <br />embankment and spillway were constructed as designed. <br />During construction, the dam u•as 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. Compaction <br />of fill was checked using a nuclear density probe and a Standard Proctor density previously determined for <br />this material using AASHO Standard Method T99~1. <br />~~S M:. MAjTF' <br />r <br />,Q- ,~~~~s e,~F~ ; 9~ <br />.s j ~~ ~ <br />20537 w; <br />t~ <br />sue. 2:p <br />~ti O <br />y ~~'.; SON AL ~~. ~ ~/ <br />~[••G ~~/ <br /> <br />M. <br />PE No. 20537 <br />ii~~~9i <br />Date <br />lMhUlkw 11N1 <br />IENG\DAMCER7'I <br />