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The Harbor Island Superfund Site is just downstream of the Lower Duwamish Waterway Superfund Site. Harbor Island is an industrial island in Seattle, Washington's Elliott Bay. Built in the early 1900s, the 420-acre island supports businesses that conduct commercial and industrial activities, including ocean and rail transport operations. Commercial and industrial operations on the site contaminated groundwater, sediment, and soil. The potential sources of contaminants are both legacy pollutants and from potentially ongoing sources.
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