Compaction Grouting hen a 52-inch diameter microtunnel boring machine (TBM) became mired in soft organic sediments at mid run beneath Pine Island Pond, construction of a cellular cofferdam was initially con- sidered in order to recover the $500,000 machine. But with construction of an open water recovery shaft estimated at over $200,000, contractors first looked for a more cost- effective alternative. Hayward Baker Inc. proposed a dis- placement

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