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<br />'- <br /> <br />001931 <br /> <br />2 <br /> <br />. <br /> <br />, <br />developed to avoid nested cobbles, as much as practicable, at the layer surface at the contact. <br />Based on our inspection of the test trenches, the CRE does not anticipate the need to provide any <br />special measures, such as the raking of rock cobbles from the surface at the contact:'- <br /> <br />Reclamation Response: <br /> <br />Reclamation concurs in this recommendation. Techniques for inspection and adjustments <br />to placement operations, if necessary, will be developed upon fIrst placements of this <br />material. <br /> <br />eRR Recommendation No, 2: <br /> <br />"The CRE agrees with Reclamation's assessment that there are no significant impacts to the <br />overall embankment stability. Back-calculation of the shear strength on the sliding surface <br />(bedding planes in the Lewis Shale) yielded a friction angle of about 150 and no cohesion. Data <br />from borings and laboratory testing and using the Rock Mass Rating system indicates high cross- <br />bedding shear strength within intact rock. A series of stability analyses of the dam simulating <br />the condition at the end of construction were performed. Potential failure surfaces were oriented <br />upstream. Calculated factors of safety exceeded 4.0 when using the low bedding shear strength <br />and the high cross bedding shear strength. <br /> <br />. <br /> <br />The CRE recommends several further stability analyses with the full reservoir and with potential <br />failure surfaces oriented downstream following bedding below the core and crossing bedding <br />below the downstream shell. These additional analyses are recommended to complete the <br />analysis of dam stability." <br /> <br />- Reclamation response: <br /> <br />Reclamation concurs in this recommendation. The requested stability analyses have been <br />completed and are included in Appendix B. A Technical Memorandum is being prepared <br />summarizing the stability calculations. <br /> <br />. <br />