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~• extend from the top of the fill, arcing down to the base of the surficial <br />soil layer alluvium) overlying the bedrock and terminating near the toe <br />of the slope in the sedimentation basin. <br />CONCLUSIONS <br />KCKA's analyses of [he stability of both profiles indicate adequate <br />long-term static stability Eor the proposed slopes. For 3:1 slope ratios <br />our calculated minimum static factors of safety were 1.8 for Profile "A" <br />and 2.4 for Profile "B". These factors of safety provide an adequate <br />margin of safety for the unlikely event of a seismic disturbance. The <br />calculated minimum static factor of safety of 1.5 for the steeper sections <br />of Profile "B" may not provide an adequate margin of safety in Che event <br />of seismic activity. IC is our opinion that no areas should be graded <br />steeper than 3:1. <br />CLOSURE <br />We trust that the information in this brief summary of our stability <br />analyses provides the information you and MLRB require at this time. At <br />your request, we can provide copies of each of the computer runs and a <br />copy of the computer program STABR. We assume that these are not required <br />at the present time. <br />If you have any further questions, please do not hesitate to give us <br />a call. <br />KENNETH C. KO b ASSOCIATES, INC. <br />Robert W. Rogers / *~O 17222 <br />P.E., Colorado No. 17222 <br />Geological Engineer '~q~~„„__ ~~ <br />/~ .«.. ~ ~-c~ <br />Kenneth C. Ko <br />P.E., Colorado No. 13119 <br />President <br />i• <br />cc: Mr. Paul Wynn <br />General Manager <br />/ja <br />9 <br />KENNETH C. KO & ASSOCIATES <br />