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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 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

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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