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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 estimated 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 considered critical <br /> for the stability for the waste piles were prepared. <br /> A series of stahility 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 }�.ydraul i cs <br /> 6. Review Existing Data - A review was made of existing 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 />