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 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
Analyte	(2008)	(2009)	Richland	Umatilla	The Dalles	Hood River	(a.m.)	(noon)	(p.m.)	Vancouver	St. Helens	Longview
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

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 