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Scientific Investigations Report 2012–5068

Reconnaissance of Contaminants in Selected Wastewater-Treatment-Plant Effluent and Stormwater Runoff Entering the Columbia River, Columbia River Basin, Washington and Oregon, 2008–10

Table 20. Concentrations exceeding freshwater-quality criteria for pesticides and polychlorinated biphenyls (PCBs) in stormwater runoff from the Willamette2 site, Columbia River Basin, Washington and Oregon, December 2009 and May 2010.

[Concentrations are in micrograms per liter. Acute: Criteria refer to an instantaneous concentration not to be exceeded at any time. Chronic: Criteria refer to a 24-hour average concentration not to be exceeded. References for criteria are: U.S. Environmental Protection Agency (EPA), 2009b; Oregon (OR) Department of Environmental Quality, 2010b; Washington (WA) State Department of Ecology, 2003. Abbreviations: CMC, criterion maximum concentration; CCC, criterion continuous concentration; –, no acute criteria]

Analyte Agency standard Acute


Concentration range

detected in this study
December May
Chlordane EPA, OR, WA 2.4 0.004 0.00007–0.011 Chronic X  
DDT (and metabolites) EPA, OR, WA 1.1 0.001 0.0061–0.017 Chronic X X
Diazinon EPA 0.17 0.072–0.78 Chronic   X
Dieldrin WA 2.5 0.002 0.00029–0.0057 Chronic X X
Malathion EPA, OR 0.1 0.5–1.3 Chronic X X
PCBs EPA, OR, WA 2 0.014 0.00002–0.44 Chronic X  

First posted April 25, 2012

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201

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