Thursday, June 9, 2016

Ottawa sinkhole struck in unstable 'rock valley' flagged by engineers

3:12 AM

Road Collapse 20160608

The sudden road collapse that left a gaping hole in the middle of Rideau Street in Ottawa Wednesday morning occurred over a vein of sand, silt and fractured rock so volatile workers completing the light rail tunnel below had to inch along cautiously for fear of causing a cave-in.



from CBC | Express Feed News http://ift.tt/1XH2Bim

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