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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 25. Instantaneous loadings and calculated concentrations for diphenhydramine, trimethoprim, galaxolide, and nonylphenol compounds in the Columbia River, Columbia River Basin, Washington and Oregon, 2008–09.


[Station names are shown in table 2. A 7Q10 flow was not available for Umatilla, so 78,000 ft3/s was used for these calculations Abbreviatons: Mgal/d, million gallons per day; 7Q10, the lowest streamflow for 7 consecutive days that occurs on average once every 10 years, this value is the Columbia River flow near the discharge point that is used for calculating mixing zones; ft3/s, cubic foot per second; µg/L, micrograms per liter; g/d, grams per day]


Analyte Wenatchee Richland Umatilla The Dalles Hood River Portland Vancouver St. Helens Longview
(2008) (2009) (a.m.) (noon) (p.m.)
Flow values
Daily discharge for sampling date (Mgal/d) 3.1 2.9 5.4 0.54 1.7 0.89 49 49 49 10 6.9 6.9
Columbia River 7Q10 flow (ft3/s) 51,557 51,557 52,700 78,000 80,637 74,000 79,436 79,436 79,436 79,436 88,900 97,400
Diphenhydramine
Concentration in sample (µg/L) 0.090 0.059 0.025 Present 0.11 0.082 0.075 0.064 0.056 0.10 0.033 0.031
Instantaneous load (g/d) 1.1 0.6 0.5 0.7 0.3 14 10 10 3.8 0.9 1
Calculated concentration in Columbia River (µg/L) 0.00001 0.00001 0.000004 0.000004 0.000002 0.0001 0.0001 0.0001 0.00002 0.000004 0.000004
Trimethoprim
Concentration in sample (µg/L) 0.15 0.19 0.1 0.11 0.12 0.089 0.079 0.076 0.073 0.02 0.072
Instantaneous load (g/d) 1.8 2.1 2.0 0.7 0.4 17 15 14 2.8 0.5 1.9
Calculated concentration in Columbia River (µg/L) 0.00001 0.00002 0.00002 0.000004 0.000002 0.00008 0.00008 0.00007 0.00001 0.000002 0.000008
Galaxolide
Concentration in sample (µg/L) 1.5 2.5 1.5 1.3 1.2 1.1 1 1.2 0.97 1.3 0.38 1.2
Instantaneous load (g/d) 18 27 31 2.7 7.7 3.7 190 220 180 47 10 31
Calculated concentration in Columbia River (µg/L) 0.0001 0.0002 0.0002 0.00001 0.00004 0.00002 0.0010 0.0011 0.0009 0.0002 0.00005 0.0001
Nonylphenol compounds
Concentration in sample (µg/L) 3.0 2.1 4.3 6.5 3.6 23 22 16 1.5 4.9 3.7
Instantaneous load (g/d) 35 23 8.8 40 12 4,200 4,100 2,900 58 130 97
Calculated concentration in Columbia River (µg/L) 0.0003 0.0002 0.00005 0.0002 0.00007 0.02 0.02 0.01 0.0003 0.0006 0.0004

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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