Study: AuSable gets worse as it goes

Treadwell suggests that municipalities begin spring road cleaning earlier than usual at sites close to the river. She also said vegetative replanting along the river's banks could stem much of the erosion that is dumping tons of particulates into the Au Sable each year.

Essex County Department of Soil and Water Director David Reckahn said each year the county and hundreds of residents plant between 5,000 and 10,000 trees, many of them along the banks of the Au Sable.

Treadwell and her research team will spend the 2010 summer season trying to pin down the exact sources of the contaminants.

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