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Consulting Engineers and Geologists <br />SCOPE <br />This report represents a geotechnical investigation conducted at the <br />site of an existing embankment currently being used as a haul road at <br />-- the Seneca II Mine near Hayden, Colorado. <br />The investigation was conducted in order to analyze the stability of <br />the embankment under dry and high water conditions to determine <br />the amount of seepage expected at the 10 year and 100 year water level <br />floo8 stages. Hydrological investigation of the site is not within <br />the scope of this report. The 10, 25, and 100 year storm water levels <br />used in this investigation were supplied by Seneca Coals, Ltd. for <br />use in our analysis. (Refer to Appendix G}. <br />The conclusions outlined in tb:is report are based on data obtained <br />during field and laboratory investigations and our experience with <br />similar geotechnical engineering investigations. Factual data gen- <br />erated during field and laboratory investigation are summarized in _ <br />Figures 1 through 10 and Table 1. Sample calculations are provided in <br />Appendix D through F of this report. <br />PROJECT HISTORY AND SITE CONDITIONS <br />The site is located approximately 9 miles (14.48 kilometers) to the <br />southeast of Hayden, Colorado (refer to Figure 1, Vicinity Map). <br />Seneca II Mine is presently operating and the embankment is currently <br />being used as part of the network of roads used to transport coal to <br />nearby user facilities. Information has been supplied by Seneca Coals <br />Limited as to construction methods and the approximate date of com- <br />pletion for the embankment (summer of 1979?. It is our understanding that <br />no density or moisture content control was maintained during construc- <br />tion. The embankment was constructed using on-site dragline equipment <br />and motor graders. Draglines used in the mining of the side walls of the <br />drainage utilized coal and overburden spoils to construct the embankment. <br />-1- <br />