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reclamation. Stability was also analyzed with respect to geotechnical <br /> factors and to potential flooding from Ralston Creek. Recommendations <br /> for interim measures to assist in long-term stability are provided. <br /> A report describing the analyses and recommendations was prepared, <br /> and assistance in preparing the waste pile stability portions of the <br /> amendment application was provided to Cotter Corporation staff. Final <br /> designs and construction drawings of facilities to protect the waste <br /> piles from potentially damaging Ralston Creek flood flows will be pre- <br /> pared, if necessary, after approvals of the permit application are ob- <br /> tained. <br /> 2,2 Scope of Work <br /> The scope of work necessary to accomplish the objective described <br /> above was separated into two parts. The first part describes the geotechni- <br /> cal services requirLd to determine the waste pile stability, both under <br /> existing and long-term conditions. The second part describes the hy- <br /> drologic and hydraulic services to determine flood flow rates and stream- <br /> bed geomorphology asthey may affect the waste piles. The two investi- <br /> gations have been integrated as discussed in items 11 and 12 for design of <br /> protective facilities and report preparation. <br /> 2.2.1 Slope Stability Evaluation <br /> 1. Evaluation of General Stability of the Area - The site was <br /> visited and inspected by an experienced engineering geologist. During the <br /> inspection, a geotechnical map was prepared at a scale of 1" - 200' . The <br /> map shows the extent of alluvial deposits , bedrock outcrops and colluvial <br /> soils. Attention was paid to any potential instability features such as <br /> old or recent landslides, unstable areas, areas of potential rockfall and <br /> other geologic hazards. <br /> - 2 - <br />