A simple one for you...
If you perform a CLR7 test and determine that for example the upper 95%ile
estimate of the population mean for arsenic is below the site specific
remedial rarget of 20mg/kg (residential end use) what would you report if
five(out of a dataset of 50) of the sampled concentrations are outliers?
Assume that the development is part of a planning application, not a Part
IIa determination and that all samples are from a topsoil material at 0.5m
depth.
Would you:
a) Determine that there is a need to investigate the outliers as they
represent contamination hot-spots; or
b) Determine that there is no need for any further assessment.
We (as consultants) are facing different interpretations of the CLR7 test
from local authorities and have also peer reviewed a fair number of other
consultants reports which also have varying opinions.
Adam
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