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Scientific Investigations Report 2008–5027

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5027

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Table 5. Potential effect of powdered activated carbon on concentrations of pesticides and degradates in finished water samples collected from the study water-treatment plant on the lower Clackamas River, Oregon, 2004–2005.

[Pesticide and degradate concentrations in micrograms per liter. Shading indicates PAC use. See p. 3 for information on the study plant’s water treatment process. Abbreviations: PAC, powdered activated carbon addition (2–5 milligrams per liter); e, estimated value (see Glossary); Rep, replicate sample; na, not analyzed]

PAC treatment
(Yes-No)		 Pesticide or degradate Date Sample Source water   Finished
drinking water
Remark Value Remark Value
No Dacthal (DCPA) 07-21-04 e 0.005 e 0.005
Yes Hydroxyatrazine (OIET) 08-25-04 e .014 < .008
Yes Dacthal (DCPA) 08-25-04 e .003 < .003
Yes Diazinon 08-25-04 e .007 < .005
Yes Trifluralin 08-25-04 e .006 < .009
Yes DEET 08-25-04 e .074 e .078
No Atrazine 05-18-05 .007 e .006
No Deethylatrazine (CIAT) 05-18-05 e .004 e .002
No Dacthal (DCPA) 05-18-05 e .002 e .002
No Diuron 05-18-05 .22 .181
No Hexazinone 05-18-05 .022 .017
No Metsulfuron-methyl 05-18-05 < .03 .058
No Pronamide 05-18-05 < .004 .005
No Trifluralin 05-18-05 e .005 e .005
No Simazine 05-18-05 .005 e .004
No 2,4-D 05-18-05 e .014 < .038
No Chlorpyrifos 05-18-05 .006 < .005
No Metolachlor 05-18-05 e .005 < .006
Yes Cycloate 09-30-05 Rep 1 .016 < .005
Yes Cycloate 09-30-05 Rep 2 .019 < .005
Yes Dacthal (DCPA) 09-30-05 Rep 1 .004 < .003
Yes Dacthal (DCPA) 09-30-05 Rep 2 .005 < .003
Yes Dimethenamid 09-30-05 Rep 1 e .005 < .006
Yes Dimethenamid 09-30-05 Rep 2 e .005 < .006
Yes Diuron 09-30-05 Rep 1 .015 < .015
Yes Diuron 09-30-05 Rep 2 .019 < .015
Yes Glyphosate 09-30-05 Rep 1 e .12 < .15
Yes Glyphosate 09-30-05 Rep 2 e .1 < .15
Yes Prometon 09-30-05 Rep 1 e .003 < .01
Yes Prometon 09-30-05 Rep 2 e .004 < .01
Yes Pronamide 09-30-05 Rep 1 .005 < .005
Yes Pronamide 09-30-05 Rep 2 < .005 < .005
Yes Triclopyr 09-30-05 Rep 1 .23 < .11
Yes Triclopyr 09-30-05 Rep 2 .23 < .11
Yes 2,4-D 09-30-05 Rep 1 .18 .081
Yes 2,4-D 09-30-05 Rep 2 .18 .075
Yes Propiconazole (cis) 09-30-05 Rep 1 e .003 e .001
Yes Propiconazole (cis) 09-30-05 Rep 2 e .003 e .001
Yes Propiconazole (trans) 09-30-05 Rep 1 e .006 e .005
Yes Propiconazole (trans) 09-30-05 Rep 2 e .006 e .005
Yes Diazinon1 09-30-05 Rep 1 .016 < .005
Yes Diazinon1 09-30-05 Rep 2 .013 < .005
Yes Diazinon-oxon1 09-30-05 Rep 1 < .006 e .010
Yes Diazinon-oxon1 09-30-05 Rep 2 < .006 e .010
Yes Simazine 09-30-05 Rep 1 .018 .021
Yes Simazine 09-30-05 Rep 2 .018 .020
Yes Ethoprop 09-30-05 Rep 1 .009 .006
Yes Ethoprop 09-30-05 Rep 2 .009 .006
Yes Metolachlor 09-30-05 Rep 1 e .005 e .002
Yes Metolachlor 09-30-05 Rep 2 e .003 < .006

1Diazinon is oxidized to diazinon-oxon during treatment.

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