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Scientific Investigations Report 2012–5068


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Reconnaissance of Contaminants in Selected Wastewater-Treatment-Plant Effluent and Stormwater Runoff Entering the Columbia River, Columbia River Basin, Washington and Oregon, 2008–10


Table 8. Summary of relative percent differences for replicate samples, Columbia River Basin, Washington and Oregon, 2008–10.


[Each analytical schedule and sample type had two replicate pairs except for mercury in stormwater runoff, which had only one replicate pair. Abbreviations: LC, laboratory code; SH, schedule; Storm, stormwater runoff; WWTP, wastewater-treatment-plant effluent; –, not applicable]


Analytical
No.		 Compound group
description		 Sample
type		 Number of
compounds
analyzed 		Number of
compounds
detected in
replicate
pair #1		 Number of
compounds
detected in
replicate
pair #2		 Relative percent difference
Minimum Median Maximum
SH 4433 Anthropogenic organic compounds WWTP 69 20, 22 34, 33 0 39 101
SH 2080 Pharmaceuticals WWTP 14 6, 7 7,7 0 13 74
LC 8093 Halogenated compounds WWTP 60 19, 20 17, 23 0 23 56
LC 8093 Halogenated compounds Storm 60 3,1 15, 9 0 42 88
SH 2033 Currently used pesticides WWTP 83 6, 6 6, 6 0 4 30
SH 2033 Currently used pesticides Storm 83 7, 7 2, 3 0 6 21
– Mercury and methylmercury WWTP 2 2, 2 2, 2 2 25 40
– Mercury and methylmercury Storm 2 2, 2 – 2 – 12
SH 1383 Polycyclic aromatic hydrocarbons Storm 56 8, 8 22, 25 0 17 58
SH 1264 Trace elements in filtered water Storm 10 8, 8 8, 8 0 4 92
SH 1264 Trace elements in unfiltered water Storm 10 7, 7 9, 8 0 4 92

First posted April 25, 2012

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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