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| Photo by Matthew West |
....... DePaola has blamed the suspected sinkhole under the tunnel and the compression of soil under train tracks serving South Station — an ongoing problem that has forced rail workers to prop up the track beds with 8 feet of ballast in recent years — on a greater than anticipated degree of settlement of the soil as it thaws out after a massive ground freezing project in 2000........
WHOLE ARTICLE: http://www.bostonherald.com/news/regional/view.bg?articleid=1361487
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