Justices with the Court of Appeal for Ontario have reserved their decision. The court heard two days of arguments earlier this month, related to the cost of clean-up at the Dryden mill site.
The province is arguing a contract made with previous owners of the mill site in 1985 doesn't apply. The respondent -- Weyerhaeuser -- is involved, as it was holding paper title to a waste disposal site on the mill site, when the province made an order to monitor in 2011.
Resolute Forest Products is registered as an intervenor in the case.
Weyerhaeuser is arguing the province agreed to accept responsibility for the site, when the property was previously sold to Great Lakes in 1979.
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