What needs to be clarified
Check comparability for specific parameters and distinguish differences in examined material from differences in methods or data presentation.
Materials to prepare
- Both complete reports, including methods, units and notes.
- Sampling records and a plan identifying the corresponding samples.
- Information on transfer, preparation and known storage conditions.
What to compare
- Connect every value to its sample and sampling location.
- Compare parameters, units, methods and stated result limitations.
- Check whether the documents concern comparable soil layers and conditions.
Possible outcome of the analysis
An opinion may explain comparable and non-comparable entries, missing information and the need for agreed additional examination.
Limits of the conclusions
Different values alone prove neither laboratory error nor contamination of the whole plot; further testing and sampling require separate agreement.