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Frequently Asked Question - How does the non- detect substitution function work?

How does the non- detect substitution function work?

GWSDAT handles non-detect data by a method of substitution. In accordance with general convention, the default option is to substitute the non-detect data with half its detection limit, e.g. ND<50ug/l is substituted with 25ug/l. Alternatively, non-detect data can be substituted with its full detection limit, e.g. ND<50ug/l is substituted with 50ug/l. Note that the entry of zero concentration values is not permitted.

CL:AIRE will not be responsible for any loss, however arising, from the use of, or reliance on, the information contained in the responses above, nor do they assume responsibility or liability for errors or omissions in the information provided. Readers are advised to use the information contained herein purely as a guide and to take appropriate professional advice where necessary.