Canadian Experience

In Canada, the cement-based stabilization-solidification (SS) technique has been used successfully in several provinces. A large-scale project was completed in Nova Scotia. The Sydney Tar Pond is a vast hundred-year-old industrial complex for producing coke and steel that had left behind more than one million tonnes of contaminated soil and sediment.

In 2004, the Canadian government and provincial government of Nova Scotia signed an agreement of $400 million to rehabilitate the site. This project was allotted a ten-year period to completion. After more than two years of studies and public consultations, cement-based SS technology was chosen. A long-term monitoring process of the water quality as well as the confinement of the contaminants in the soil was also planned. “It is important that engineers who specialize in the environment look at cement-based SS among the possible solutions, and that the owners of contaminated sites, as well as the legislators see this technology as being proven and profitable”, according to Colin Dickson, Engineer and Director of Business Development—Maritime Region—for the Cement Association of Canada.