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• 41 ~~il 2006 (Revised November 2006j, Yeh and Associates, Inc., Final <br />c,t-otechnical Investigation and Evaluation Re-porl Bruce Park Landslide, <br />-- J~,rr,r Creek Reservoir, Bowie No, 2 Mine Delta Couniv. Colorado, Protect <br />-- `;_._25-194 submitted to Bowie Rescurces, ILC, Paonia. Colorado. <br />Conclusions and Recommendations <br />Poye 1 of 1 <br />BcrSed on our investigation and analyses. we conclude ?t-re following: <br />The fine-grained nature of the landslide materials poses a low risk for <br />liquefaction. It appears there is a low poteMiol for the landslide to <br />move as a high velocity debris flow. <br />I` the estir-nated volume of the landslide was to completely displace <br />~~,to the reservoir, we expect it would raise the reservoir level only <br />about 1 tc 2 feet. We eslimate the reservoir was designed with of <br />Ir::ast 10 feet of free board on the dam. <br />the anticipared seismic events are relatively small (<4.OML) and <br />would likely not accelerate the landslide to a rate lhat would cause <br />a water wave large enough to compromise the darr?. Our analysis <br />indicated the landslide would hove to accelerate several thousand <br />times the current rate to produce a wave at least a S feel high. <br />In summary, we do not believe the global stability of the existing landslide <br />would be significantly reduced due to the mining activity planned near <br />Terror Creek Reservoir. The slight reduction in global stability would likely <br />not cause a catastrophic slope failure large or lost enough to <br />compromise the integrity of the Bruce Park Dam. <br />.- • <br />