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Abstract: The Upper Lillooet River Hydroelectric Project, an 81.4 MW run-of-river hydropower project is located in Southeastern British Columbia, Canada. The project involved the excavation of a 6 m wide x 5.5 m high, approximately 2500 m long tunnel along the Upper Lillooet Valley, adjacent to the Mount Meager Volcanic Complex, the most recently active volcano in Western Canada. Tunnelling conditions...