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 24. Oil and grease detected in stormwater runoff, Columbia River Basin, Washington and Oregon, 2009–10. 

[Station names are shown in table 3. Concentrations are in milligrams per liter. Abbreviations: –, not detected; E, estimated] 

Short name	Date	Time	Reporting  limit	Concentration  in sample	Concentration  in method blank
Wenatchee	12-21-09	1340	5.0	–	–
Richland	05-02-09	1200	5.0	E 4.4	E 1.5
Umatilla	10-04-09	0920	5.0	E 4.4	E 2.4
The Dalles	02-23-09	1210	5.0	E 3.5	E 2.1
Hood River	02-23-09	1310	5.0	E 4.1	E 2.1
Portland1	10-14-09	1100	5.0	E 4.8	E 2.3
Vancouver1	12-16-09	1340	5.0	E 2.3	–
Vancouver2	12-16-09	1210	5.0	E 3.3	–
Portland2	10-26-09	1210	5.0	E 3.6	–
Willamette1	06-04-10	0840	4.7	E 4.0	E 3.4
Willamette2–Dec	12-15-09	1330	5.0	5.6	–
Willamette2–May	05-26-10	1310	5.4	6.7	E 3.6
Willamette3	12-15-09	1310	5.0	–	–
Willamette4	05-26-10	1410	5.5	4.1	–
St Helens	03-30-10	1310	4.7	E 2.5	E 1.7
Longview	03-30-10	1410	4.7	E 2.5	E 1.7