As part of a 3 year study evaluating the effectiveness of permeable pavement and bio-swales under southern Ontario climate conditions a number of older bioretention areas were surveyed to assess the effect that age may have on various aspects of the infiltration practice.  Soil quality was assessed to determine the extent to which road runoff contaminants build up in soils over time.

The old Toronto and Region Conservation Authority Head Office at 5 Shoreham Drive had a bioretention/wetland next to it’s driveway.  It was constructed in 1997.  The site survey was limited to visual assessments of plant condition and soil quality sampling.

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