USGS Scientific Invesigations 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

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  (CMC)	Chronic  (CCC)	Concentration range  detected in this study	Crtierion exceeded	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

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

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