An Equipment Operator, operating a Gradal excavator to exhume waste from a pit located inside Waste Management Facility enclosure at the Radioactive Waste Management Complex, when the edge sloughed off of an adjacent open 21-foot deep pit causing the excavator to slide into it. Lessons Learned: Proper dig face preparation and excavator placement before and during waste exhumation is crucial when excavating on unstable soil conditions to prevent sloughing and potential equipment slide-offs.
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