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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />-A <br /> <br />'-' <br /> <br />The cost summary is: <br /> <br />Alternative Description Estimated Cost <br />1 Cement-bentonite slurry cutoff wall $1,064,120 <br />2 Soil-bentonite slurry cutoff wall 842,360 <br />3 Grout curtain cutoff wall 1,227,800 <br />4 Breach dam 648,800 <br />5 Partial reservoir seepage blanket 341,400 <br /> <br />7.4 ALTERNATIVE EVALUATIONS <br /> <br />Alternative 5, line a portion of the reservoir and the upstream face of the dam, was <br />selected as the preferred alternative for the following reasons: <br /> <br />· The least design effort. 'The design, can be completed with the information <br />'- <br />already obtained. Alternatives 1 through 3 may require additional field <br />investigations to better'define costs of construction. <br /> <br />· Construction logistics are simpler. The construction for this alternative <br />can be completed with conventional construction equipment with using the <br />existin~ access to the site. Alternatives 1-3 would require special road <br />work to access the site, thereby lengthening the construction schedule and <br />adaitional costs. <br />I .~ <br /> <br />· Construction time schedule is shorter. <br /> <br />· "The 'alternative is significantly less expensive than Alternatives 1 through <br />3 aiids,?mewhat less expensive than Alternative 4. <br /> <br />23067/Rl.7 09-03-93(3:24pm)/RPT <br /> <br />7-5 <br />