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 15. Mercury species in unfiltered wastewater-treatment-plant effluent and stormwater runoff, Columbia River Basin, Washington and Oregon, 2009–10. 

[Station names are shown in tables 2 and 3. Outfalls sampled prior to December 2009 were not analyzed for mercury species. Concentrations are reported in nanograms per liter (ng/L). Symbol: –, not detected at a reporting limit of 0.04 ng/L] 

City or short name	Date	Time	Methyl- mercury	Total mercury
Wastewater-treatment-plant effluent
Wenatchee	12-01-09	0850	–	4.1
Richland	12-02-09	0820	0.19	4.2
Umatilla	12-02-09	0950	–	1.9
The Dalles	12-02-09	1200	0.40	16
Hood River	12-02-09	1310	–	2.7
Portland	12-10-09	0840	0.14	7.6
Vancouver	12-02-09	1510	0.06	13
St Helens	12-03-09	0900	0.15	3.9
Longview	12-08-09	0810	0.22	10
Stormwater runoff
Wenatchee	12-21-09	1340	0.09	3.4
Vancouver1	12-16-09	1340	–	8.8
Vancouver2	12-16-09	1210	0.07	15
Willamette1	06-04-10	0840	–	6.3
Willamette2–Dec	12-15-09	1330	0.39	230
Willamette2–May	05-26-10	1410	–	74
Willamette3	12-15-09	1310	–	17
Willamette4	05-26-10	1310	0.11	12
St. Helens	03-30-10	1310	0.07	3.1
Longview	03-30-10	1410	–	2.1

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 