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Summary and assessment of toxics data for the Tualatin River

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https://ir.library.oregonstate.edu/concern/defaults/v692tb44r

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  • The Tualatin River is a major water resource for Washington County. In its course, the river drains forest lands, farmlands, and urban areas receiving toxic materials from non-point source runoff: Wastewater treatment plant effluents from municipalities and industries also contribute toxic materials to the river. Many materials discharged into the river system can be toxic to human health and aquatic organisms if present above critical concentrations. These materials include heavy metals and organic compounds, such as insecticides, polychlorinated biphenyls, herbicides, and certain industrial organics. Considerable information on the presence and concentration of potentially toxic materials is available from measurements by different agencies with varying program objectives. This project collected and assembled existing data to evaluate the adequacy of the toxics data record: and to assess possible toxicity problems in the Tualatin River. The concentrations of potentially toxic materials in the Tualatin River from the summary of existing toxics data are low compared to water quality standards. The major sources of metals in the river appear to be the four municipal wastewater treatment plants and urban runoff: Based on sediments data, major sources of toxic organics of industrial origin are Fanno Creek and Beaverton Creek tributaries from point sources or urban runoff However, the parameters measured, the sampling locations, and the sampling frequency, are limited. A more comprehensive sampling program coupled with specific focused studies is required to provide a more complete understanding of the possible toxic effects in the river.
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file details TUALATIN-14_ocr.pdf 2017-10-06 Público Baixar