Tornado Motion Technologies in the NewsSt. Clair River [project details]
The river was identified as one of the badly polluted "areas of concern'"on the Great Lakes and an international remedial action plan was launched to clean it up.
Great Lakes Directory
The sediment is so toxic in some areas that species of fish and clams, normally tolerant of polluted water, died after being left in cages in the sediment during studies in 1996.
The company is expected to remove 28,000 cubic yards of contaminated sediment.
Bi-National Public Advisory Council Meeting 9-18-02
Dow Chemical Canada Inc. Project Leader C. Creber provided an overview of the pilot project stating that, "the dredge operated at 30-40% solids and the dredge operation was clean with no downstream impacts observed."
Downriver residents were concerned that
vacuuming might impact drinking
Dow used an industrial-strength vacuum cleaner to suck up sediment laced with decades-old contaminants lying downstream of the plant and transfer it to a holding pond on shore. Initially environmentalists feared an impact on drinking water. But the technology proved successful at removing sediment without stirring up deposits of Perchloroethylene, Carbon Tetrechloride and other chemicals. "It was certainly nice to show people we could do it," Creber said. A spokesperson for Environment Minister Leona Dombrowsky praised the project, noting it should help the process of de-listing the St. Clair as a toxic hotspot.
... the company completed a three year cleanup of the St. Clair River... and proved skeptics wrong in the process. The work which cost Dow nearly $100 million, moves the St. Clair River one step closer to loosing its designation as a Great Lakes area of concern.
Dow Manufacturing Site News
"This technology essentially vacuums the sediment and small debris from the River bottom," says C. Creber, Dow's Remediation Manager for Canada. "Because of the nature of the technology, we expect little re-suspension of particles in the water to occur, and whatever suspension occurs will be monitored closely. Dow will continue to work on this project with the Ontario Ministry of the Environment Canada.
"Protecting the river's drinking water quality remains as a project priority," said C. Creber. "River water quality will be monitored throughout the vacuuming operations and reported to regulators and downstream water user groups on a regular basis."
"Protecting the environment during the sediment removal operation was the most critical goal for the project team," said C. Creber, Remediation Leader, Dow Canada. This recent experience, which further demonstrated the practical capabilities of the hydraulic vacuum technology, will be invaluable as we plan the final phase of the project...
"We have succeeded in meeting our objective- we have removed the sediment while protecting river drinking water quality for the local community and downstream users," said C. Creber, Remediation Leader, Dow Canada.
Letter from Site Leader Steve Bolt
...the St. Clair River Remediation Project was completed using hydraulic vacuum technology to remove remnants of historical contaminated sediment from the river bottom, and it was very successful ...results showing no adverse impact on river drinking water quality or clarity...
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