Construction of the single largest project to date on the City of Indianapolis CSO Program has been successful, but faced challenges. Microtunneling six drives of a 72-inch pipe some 4,000 ft through glacial outwash and dense till has tested the Rasa Microtunnel Tunnel Boring Machine and the construction team. Highly abrasive sand with cobbles below the water table, contaminated groundwater in shaft excavations, steering forces that broke the pipe joints and a void below a concrete pavement that took 46 cubic yards of flowable fill are amongst the issues that were addressed and discussed in this paper.
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