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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 12. Physical properties and suspended-sediment results for wastewater-treatment-plant effluent, Columbia River Basin, Washington and Oregon, 2008–09.


[Station names are shown in table 2. Abbreviations: Mgal/d, million gallons per day; mg/L, milligrams per liter; µm, micrometer; NA, not analyzed]


City Date Time Daily plant
discharge for
sampling date
(Mgal/d)
Water
temperature
(degrees Celsius)
pH
(standard
units)
Suspended
sediment
(mg/L)
Suspended
sediment
(percent
finer than
63 µm)
Wenatchee 12-02-08 1010 3.1 15.6 6.9 4 98
  12-01-09 0850 2.9 18.0 7.4 3 92
Richland 12-04-08 0900 5.4 18.3 7.2 5 64
  12-02-09 0820 5.8 NA NA NA NA
Umatilla 12-03-08 0840 0.54 16.9 7.4 2 93
  12-02-09 0950 0.53 NA NA NA NA
The Dalles 12-05-08 0830 1.7 15.8 7.0 2 96
  12-02-09 1200 1.5 NA NA NA NA
Hood River 12-10-08 0950 0.89 14.0 6.9 4 95
  12-02-09 1310 0.92 NA NA NA NA
Portland (a.m.) 12-09-08 0900 49 15.6 8.8 3 95
(noon) 12-09-08 1150 49 NA NA 5 99
(p.m.) 12-09-08 1500 49 NA NA 4 94
Portland 12-10-09 0840 58 NA NA NA NA
Vancouver 12-08-08 0940 10 18.5 7.4 3 97
  12-02-09 1510 9.7 NA NA NA NA
St Helens 12-03-09 0900 6.9 NA NA 7 96
Longview 12-08-09 0810 6.9 NA NA 6 94

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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