USGS Scientific Investigations Report 2012–5091  - Reconnaissance of Land-Use Sources of Pesticides in Drinking Water, McKenzie River Basin, Oregon 

Table 12. Summary of results from sampling over different regions of the storm hydrograph. 

[Number of samples: Number in parentheses represents detections based on common detection level of 0.1 µg/L. Abbreviations: E, concentration estimated between the minimum detection level and the laboratory reporting limit; µg/L, microgram per liter] 

Season	Sample type	Number of samples	Compound	Concentration (µg/L)
69th Stormwater channel
Fall 2002	Rise	8 (3)	2,4-D	0.64
			Caffeine	E 0.33
			Carbaryl	E 0.068
			Diazinon	0.11
			Diuron	E 0.05
			Malathion	E 0.018
			Prometon	E 0.02
			Trifluralin	E 0.001
Fall	7 (2)	2,4-D	0.19
			Carbaryl	E 0.019
			Diazinon	0.096
			Diuron	E 0.36
			Malathion	E 0.026
			Prometon	E 0.01
			Trifluralin	E 0.001
42nd Stormwater culvert
Spring 2005	Early	5 (3)	2,4-D	0.78
			2,4-DB	0.03
			Caffeine	E 1.39
			Carbaryl	E 0.039
			Diuron	0.10
			Peak	8 (5)
			2,4-D	E 0.4
			2,4-DB	0.04
			Caffeine	E 1.09
			Carbaryl	0.022
			Diuron	0.09
			Picloram	E 1.69
			Sulfometuron-methyl	0.24
			Tebuthiuron	1.43
64th Stormwater pipe
Spring 2005	Early	5 (2)	2,4-D	0.16
			2,4-DB	0.03
			Caffeine	0.22
			Carbaryl	E 0.061
			Diphenamid	0.02
	Peak	7 (2)	2,4-D	0.32
			2,4-DB	0.05
			Caffeine	0.18
			Carbaryl	E 0.12
			Diazinon	0.018
			Diuron	0.02
			Prometon	0.04