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 18. Physical properties and suspended-sediment results for stormwater runoff, Columbia River Basin, Washington and Oregon, 2009–10. 

[Station names are shown in table 3. Abbreviations: L/min, liters per minute; mg/L, milligrams per liter; µm, micrometer; µS/cm, microSiemens per centimeter; –, not determinded at time of sampling or not analyzed; E, estimated] 

Analyte	Estimated  discharge from  pipe during  sampling  (L/min)	Suspended  sediment  (mg/L)	Suspended sediment (percent finer than 63 µm)	pH (standard units)	Specific conductance  (µS/cm)
Wenatchee	0.5	5	78	7.2	144
Richland	–	9	82	–	–
Umatilla	–	834	86	–	–
The Dalles	1.8	22	99	–	–
Hood River	1.7	2	59	–	–
Portland1	10	20	95	–	–
Vancouver1	12	61	80	7.3	E 12
Vancouver2	0.8	62	94	7.5	E 38
Portland2	12	10	88	7.6	E 36
Willamette1	–	12	93	7.9	140
Willamette2–Dec	3.3	47	97	6.5	131
Willamette2–May	3.3	36	98	6.8	263
Willamette3	–	162	95	7.1	E 98
Willamette4	2.5	42	98	7.4	112
St Helens	40	5	94	7.1	144
Longview	60	53	99	6.9	243

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 