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• • Slope buttressing <br />A buttress may be placed to reinforce the steep slopes immediately below the existing access road. <br />Due to the existing steep slopes, a reinforced earth buttress would probably be required. An earth <br />buttress reinforced with geotextiles or geonets is suggested. <br />• Stone or Concrete Columns <br />Stone or concrete columns may be installed within the potential slide mass. The purpose of these <br />columns is to provide additional shear strength along [he potential failure surface. The spacing and <br />diameter of these columns is a key factor in the design to stabilize the complete area. <br />• Subsurface Drainage <br />Deep french drains located pazallel and/or perpendicular to [he slope may be installed. These <br />drains would decrease the pore water pressures within [he soil mass by discharging groundwater <br />into Pond 12. <br />Independent of the alternative selected to stabilize [he area, Montgomery Watson recommends that surface <br />water run-off and run-on control measures be implemented as soon as possible. These measures should <br />consist of adequately designed and lined surface water diversion channels and down-drains where <br />necessary. In addition, surface slope protection measures such as vegetation or placement of rip-rap should <br />also be implemented. <br />We hope these recommendations and proposed work plan meet the requ'vements of Seneca Coal Company. <br />Please contact us incase you have any questions or need additional information. <br />• Besl regards <br />Montgomery Watson Americas Inc. <br />'~ <br />• \ Y~A~.1.wt <br />Jorge C. Troncoso <br />Senior Engineer <br />_.~~ <br />Thomas Leidich, P.E. <br />Supervising Engineer <br />• <br />