Downtown sinkhole formed in previously excavated pit - Ottawa - CBC News

By CBC News Ottawa, March 21, 2014

A large sinkhole formed on Waller Street when tunnelling for the new LRT line passed beneath a previously excavated construction pit, according to a technical memo released by the City of Ottawa on Friday. Ottawa Light Rail Transit Constructors wrote in the memo that the mining crew noticed "excessive loose and wet material start to fall" around 9:40 p.m. on February 20. By 1 a.m. on February 21, the sinkhole reached the surface on Waller Street near Laurier Avenue, leaving an eight-metre wide opening in the street. via Downtown sinkhole formed in previously excavated pit - Ottawa - CBC News.

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