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.., ., <br />~Fi ~ °~, ~ Consulting Engineers and Geologists <br />The small affect of the water surface is due to the relatively high <br />amount of "freeboard" (crest elevation to maximum water level elevation) <br />and the massive width of the embankment. <br />CONCLUSIONS <br />This report presents the results of an investigation conducted on the <br />Haul Road No. 1 Embankment at the Seneca II Mine near Hayden, Colorado. <br />The embankment fill is erratic in type and density. For this reason a <br />statistical analysis was conducted to determine mass strength for sta- <br />bility analyses. Based on the results of the statistical strength <br />analyses and the stability and seepage analyses at the 100 year pro- <br />able storm water level, the embankment is stable with respect to mass <br />failure. It should be noted that the probability of the 100 year storm <br />is less than one (1) percent during the estimated 23 year life of the <br />structure. <br />The analyses conducted do not address the potential far embankment <br />erosion. Severe erosion could lead to localized embankment failure <br />which could endanger the stability of embankment mass. For this reason <br />it is recommended that both the up and down stream embankment slopes be <br />revegatated to reduce the erosion potential. <br />It is our recommendation that the embankment be inspected by a qualified <br />geotechnical engineer annually and during periods of maximum water <br />ponding if ponding occurs, to evaluate embankment performance. <br />If you have any questions regarding the contents of this report, <br />or if additional consultation is required, please do not hesitate to <br />contact us. <br />-11- <br />