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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 23. Concentrations exceeding freshwater-quality criteria for trace elements in stormwater runoff, Columbia River Basin, Washington and Oregon, 2009–10.


[Station names are shown in table 3. Concentrations are in micrograms per liter; Acute: Criteria refer to the average concentration for 1 hour. Chronic: Criteria refer to the average concentration for 4 days, neither of these criteria should be exceeded more than once every 3 years. All criteria are based on concentrations in filtered water, except for mercury, which is based on concentrations in unfiltered water; a hardness of 50 milligrams per liter was used for criteria calculations; there were no exceedances of criteria in stormwater collected in Richland, Hood River, St Helens, or Longview. 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. E, estimated]

Analyte Agency
standard
Acute

(CMC)
Chronic

(CCC)
Concentration
range detected

in this study
Criterion
exceeded
Wenatchee Umatilla The Dalles Portland1 Vancouver1 Vancouver2 Portland2 Willamette1 Willamette2 Willamette3 Willamette4
–Dec –May
Cadmium EPA 1.03 0.15 E 0.01–0.6 Chronic                 X X    
Copper OR, WA 8.86 6.28 E 0.68–11 Acute X     X                
          Chronic X   X X   X X X        
Copper EPA 6.99 4.95 E 0.68–11 Acute X   X X   X X X        
          Chronic X X X X X X X X X      
Lead OR, WA 30 1.17 0.03–12 Chronic           X     X X    
Lead EPA 39 1.17 0.03–12 Chronic           X     X X    
Mercury WA 2.1 0.012 0.002–0.23 Chronic           X     X X X X
Mercury OR 2.4 0.012 0.002–0.23 Chronic           X     X X X X
Zinc OR, WA 64 58 4.5–100 Acute X           X X        
          Chronic X           X X       X
Zinc EPA 65 66 4.5–100 Acute X             X       X
          Chronic X             X       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
http://or.water.usgs.gov

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