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<br />• adjacent to the waste piles appeared to have similar characteristics. <br />Disturbed bulk samples of these exposed soils were collected and index <br />test, including moisture content, gradation and liquid and plastic <br />limits performed. Physical properties of the soils necessary for the <br />analyses were estimateA on the basis of these index tests. <br />4. Selection of Critical Sections and Stability Analyses - <br />Using the topographic maps, several cross-sections that had been <br />prepared by Cotter, and additional sections that were surveyed for the <br />purpose of this study, a series of sections considerec critical <br />for the stability for the waste piles were prepared. <br />A series of stability analyses of the existing, future and <br />reclaimed waste pile configurations were performed by computer using <br />Spencer's analysis. The analysis included a case of potential removal <br />of part of the pile toe by severe erosion. The evaluation of this <br />case was supported by surface hydrology and hydraulic studies described <br />• in Section 5.0. <br />5. Recommendations - The results of the work described within <br />this part of the study are summarized in this report and recommendations <br />are made with respect to the present stability conditions and the <br />stability conditions for the future and after reclamation. <br />2.2.2 Hydrology and Hydraulics <br />6. Review Existing Data - A review was made of exi~;ting stud- <br />ies that have been completed for the mine site, for Ralston Creek Dam <br />and reservoir for Ralston Creek to determine the location at which <br />flood flows were estimated, the recurrence interval and the study <br />method. <br />• -4- <br />