2014-04-02 – EPA – Question from CAG members – Why is filtered sample result higher than the unfiltered sample result

2014-04-02 - EPA - Question from CAG members - Why is filtered sample result higher than the unfiltered sample result

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Hi Dan,
Gravatt, Dan[Gravatt. [email protected]]
‘Kirby Webster'[[email protected]]
Terrie Boguski
Wed 4/2/2014 5:41:53 PM
WLL suggestion
A question that I’ve received repeatedly from CAG members is, “Why is the filtered sample
result higher than the unfiltered sample result. It seems like this happens frequently. At least
there were several examples in the thorium results in the October 2013 groundwater monitoring
report. I don’t have an adequate explanation for the CAG. In an email I explained that the
sampling/analysis process isn’t perfect and a combination of things might be causing the
unfiltered result to be lower than the filtered result for the same sample. Do you have a better
explanation? It might be helpful if you took a few minutes at the next CAG meeting to discuss
data quality and this specific question. The October result for MW 1204 is particularly
interesting 19.46 DIS vs. 0.35 TOT
Thanks.
Terrie
Terrie Boguski
Senior Technical Analyst
Skeo Solutions
913-780-3328 (office)
913-568-7550 (cell)
WLLFOIA4312 – 001 – 0011655
WLLFOIA4312 – 001 – 0011656