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00Jacobs Associates was also responsible for geotechnical characterization, which consisted of examination and mapping of existing pilot tunnels and surface outcrops, observation of percussive drilling at the ground surface, and laboratory testing of rock materials taken from within the pilot tunnels. An instrumentation and monitoring program was implemented to measure ground and tunnel lining displacements. Both Multiple Point Borehole Extensometers and lining convergence measurements were utilized.
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