Shotcrete gutter along upper access road Shotcrete gutter along upper access road. Shotcrete gutter along upper access road Drilling for soil nail installation along lower bluff. Locations for soil nail installation in Jackson formation along lower bluff Soil nail wall as seen from lower bluff East end of soil nail wall Tri Cone Rotary bit used for drilling soil nail holes Delivery of soil nails along upper access road Overall shot of soil nail wall - west end Overall shot of soil nail wall - east end Fragments of Jackson formation at base of lower bluff Worn drill bit used in installation of soil nails Worn drill bits used in installation of soil nails