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

Table 8. Benchmark quotients for compounds detected at source water for the Eugene Water and Electric Board drinking water facility. 

[µg/L, micrograms per liter; MCL, Maximum Contaminant Level; HBSL, Health-Based Screening Level; BQ, Benchmark Quotient (ratio of measured concentration to HBSL concentration); E, concentration estimated between minimum detection level and laboratory report limit] 

Compound	Concentration (µg/L)	Sample date	MCL concentration (µg/L)	HBSL concentration (µg/L)	BQ for MCL	BQ for HBSL
Diazinon	0.009	12-24-03	–	1	–	0.009
Caffeine	0.012	09-17-04	–	–	–	–
AMPA	0.02	10-04-08	–	–	–	–
AMPA	0.02	05-05-09	–	–	–	–
Carbaryl	E 0.005	05-05-09	–	40	–	0.0001
Hexazinone	E 0.007	05-05-09	–	400	–	0.00002
Atrazine	E 0.006	05-06-09	3	–	0.0021	–
CIAT	E 0.004	05-06-09	–	–	–	–
Cypermethrin	E 0.014	10-24-09	–	40	–	0.0004
CIAT	E 0.004	03-30-10	–	–	–	–
Carbaryl	E 0.01	03-30-10	–	40	–	0.0003
Sulfometuron-methyl	E 0.0064	03-30-10	–	2,000	–	0.000003