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Scientific Investigations Report 2012–5091


Reconnaissance of Land-Use Sources of Pesticides in Drinking Water, McKenzie River Basin, Oregon


Table 5. Summary of replicate samples.


[Values in parentheses describe N for replicate pairs where RPD >10. Abbreviations: </<, both concentrations less than laboratory report level (LRL); </E, one concentration less than LRL, the other estimated between the minimum detection level (MDL) and LRL; </unqualified, one concentration less than LRL, the other not qualified; E/E, both values estimated between MDL and LRL; E/unqualified, one value estimated between MDL and LRL, the other value unqualified; unqualified/unqualified, both values unqualified]


Replicate type Number of
samples
Number of
compound pairs
< / < < / E < / unqualified E / E E / unqualified Unqualified/
unqualified
Split concurrent 11 1,201 1,179 4 5 6 (1) 1 (1) 6 (3)
Rise and fall / rise 2 211 197 3 3 4 (3) 1 (1) 3 (3)
Rise / fall 1 103 95 1 0 5 (4) 0 2 (2)
Composite / grab 4 488 483 2 0 1 1 (1) 1 (1)

First posted May 30, 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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