By Dean Beebe, CBC News Ottawa, April 6, 2017
Parks Canada is testing mucky sediment along the Ottawa stretch of the Rideau Canal to decide whether the UNESCO World Heritage Site should be added to an inventory of Canada's most contaminated properties.
At the same time, the Ontario government is investigating whether game fish in the canal have dangerous levels of toxins, and should never be put on a dinner plate.Both moves this spring follow Parks Canada's decision to temporarily halt repairs along a section of the picturesque canal after workers churned up canal-bed toxins while laying bricks in November.
http://www.cbc.ca/news/politics/rideau-canal-toxins-parks-fish-mckenna-industrial-waste-1.4056815