The defendant, Renfrew Power Generation Inc. (RPG), brought a motion to decertify a class action alleging trespass due to shoreline erosion caused by a raised lake level.
The original certification was based on the understanding that a 107.5 Contour Line defined all class members' property boundaries.
New survey evidence, obtained after certification, revealed that many class members' boundaries were not defined by this contour line, but by metes and bounds or other methods, and that RPG acquired flooding rights through various means not uniformly affecting all properties.
The court found that the common issue, as certified, was no longer necessary or a substantial ingredient for each class member's claim, as individual property boundary determinations were required.
The motion to decertify was granted.