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Harrison Western rehabilitated 600 LF of tunnel in the Pennsylvania Mine, which is located at over 10,000 feet elevation. In addition to scaling, spiling, and installing steel sets to re-support the historic mine, HW cleared a cave-in at the 100’ station, installed a walkway, and cleaned ventilation structures to allow teams to investigate and establish parameters for a concrete bulkhead and closure. Contaminated water was diverted through a passive water treatment system before release downstream.