Y ear: Technology: 2007 Compaction Grouting Toronto’s news media outlets were abuzz one afternoon in the sum- mer of 2006 after a garbage truck was partially swallowed by a large sinkhole that developed in a back alley laneway in midtown Toronto. The laneway dates to the 19th century and in the weeks following the drama, investigations determined that the sinkhole was caused by a combination of poor initial construction, layers of organic s

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