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~- <br />l~femo ~o Susan Morrison <br />Seneca II-W Geotechnical Adequacy <br />page 2 <br />failure. Once initiated such a slide could compromise the operational <br />integrity of the haul road and make it extremely difficult to ultimately <br />comply with the regulatory requirements to achieve a stable reclaimed <br />topography. Continued Instability of the reclaimed slope could lead to <br />interference with the channel geomorphology and elevated sediment yield. <br />Bruce Stover and I concur in our belief that geotechnical engineering <br />accommodations can be completed to construct a stable haul road excavation. <br />However, appropriate geotechnical precautions will need to be taken. The <br />operator's consultants should propose a preliminary stabilization program for <br />the haul road excavation prior to any disturbance, supported by appropriate <br />stability analyses. Following approval of the preliminary stabilization <br />program, the necessary geotechnical investigations should be completed along <br />the pioneer road. Observations completed within the pioneer excavation and <br />test pits should be used to supplement the preliminary design analyses. A <br />slope stability monitoring program should be conducted to verify stability of <br />Haul Road G. <br />Bruce Stover also expressed a concern that soil materials encountered in the <br />area of the southern abutment of the embankment of pond 005 (Station 40+00') <br />may have been derived by mass wasting of the adjoining slope. Mr. Ivey <br />differed with this opinion. The operator should also complete a test pit <br />investigation of these deposits during pioneer road construction, in order to <br />verify the morphology of this thick clay-rich deposit. If any stability <br />concern is determined to exist, appropriate geotechnical precautions should be <br />proposed and implemented following approval. <br />cc: Larry Routten <br />Bruce Stover <br />JP/jP <br />Doc. No: 2791E <br />