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 5. Summary of quality-control (QC) analyses performed for this study, Columbia River Basin, Washington and Oregon, 2008–10. 

[Station names are shown in tables 2 and 3.]

City or short name	Date	Type of quality-control sample	Suspended sediment	Anthro-pogenic organic compounds in unfiltered water	Pharmaceuticals in filtered water	Halogenated compounds on solids filtered from samples	Currently used pesticides in filtered water	Mercury and methyl-mercury in unfiltered water	Polycyclic aromatic hydrocarbons in unfiltered water	Trace elements in unfiltered and filtered water	Oil and grease in unfiltered water
Wastewater-treatment-plant effluent samples
2008 visit to initial seven cities
Umatilla	12-03-08	Blank	X	X	X	X¹
Vancouver	12-08-08	Replicate	X	X	X	X
2009 revisit and additional cities
Umatilla	12-02-09	Blank						X
Vancouver	12-02-09	Replicate					X	X
St Helens	12-03-09	Replicate	X	X	X	X	X	X
Stormwater-runoff samples
2009 and 2010 storms
Wenatchee	12-21-09	Replicate	X			X	X	X	X	X	X
The Dalles	02-23-09	Blank	X				X		X	X	X
Portland2	10-26-09	Replicate	X			X	X		X	X	X
Willamette1	06-07-10	Blank	X			X	X	X	X	X	X

¹ Filter papers were analyzed instead of a field blank for this method.