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Water-Quality Assessment of the Sacramento River
Basin, California: Water-Quality, Sediment and Tissue
Chemistry, and Biological Data, 1995-1998
(Open-File Report 2000-391)

Colusa Basin Drain at Road 99E near Knights Landing, California

Pesticides in filtered water (0.7 micrometer glass fiber filter) analyzed by gas
chromatography/ion trap mass spectrometry)

Number of significant figures do not reflect analytical method reporting levels.

Method reporting levels of all analytes

[nanogram/L - nanogram per liter, < - less than, E - estimate]

Date Time Eptam (nanogram/L) Pebulate (nanogram/L) Molinate (nanogram/L) Trifluralin (nanogram/L) Simazine (nanogram/L) Carbofuran (nanogram/L) Atrazine (nanogram/L) Fonofos (nanogram/L) Diazinon (nanogram/L) Carbaryl (nanogram/L) Alachlor (nanogram/L) Thiobencarb (nanogram/L) Malathion (nanogram/L) Metolachor (nanogram/L) Chlorpyrifos (nanogram/L) Dacthal (nanogram/L) Methidathion (nanogram/L) Napropamide (nanogram/L) Cyanazine (nanogram/L)
2/7/96 1030 <44 <44 77 E8 431 <31 <38 <41 4033 <41 28 <38 <57 <44 <25 E9 186 60 <41
3/6/96 1030 <44 <44 <60 <57 <22 <31 <38 <41 <28 <41 <28 <38 <57 <44 <25 <25 <38 <60 <41
4/23/96 1030 <44 <44 <60 <57 34 E13 <38 <41 55 E11 28 <38 <57 E7 <25 100 <38 <60 <41
5/22/96 1000 E15 <44 3708 <57 E14 404 <38 <41 E6 E15 <28 4970 <57 171 <25 <25 <38 <60 <41
6/14/96 1000 E29 E23 3598 <57 E9 54 <38 <41 E17 <41 <28 5971 <57 131 <25 <25 <38 <60 <41
7/23/96 1001 E7 <44 1384 <57 <22 E21 <38 <41 E11 <41 <28 273 <57 52 <25 E1 <38 <60 <41
8/27/96 1002 <44 <44 576 <57 <22 53 <38 <41 <28 <41 <28 73 <57 E13 <25 <25 <38 <60 <41
9/9/96 1030 <44 <44 420 <57 <22 74 <38 <41 <28 <41 <28 71 <57 <44 <25 <25 <38 <60 <41
10/18/96 0950 <44 <44 E23 <57 <22 <31 <38 <41 <28 <41 <28 E8 <57 E11 <25 <25 <38 <60 <41

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