Rediscovery of the Lower Duwamish River Estuary Solutions to Pollution by Point and Nonpoint Source Controlsby Timothy E. Sample, Municipality of Metropolitan, Seattle, Seattle, WA, USA,
Abstract: Beginning in 1960, a series of point-source pollution controls, new sewage interceptors and treatment plant upgrades dramatically improved conventional water quality parameters in the river. Using in-river sediment chemistry and city storm-drain maps, investigators designed a sampling program to identify sources of pollution. Sediment samples were collected at key junctures in 12 storm-drain systems. Four drains were found to contain toxicant concentrations significantly greater than typical street dust for the area. Through follow-up sampling, sources of contamination were identified and cleaned.
Subject Headings: Water pollution | Nonpoint pollution | Point source pollution | Sediment | Water treatment plants | Water quality | Chemistry | Drainage
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