What should not be done to a sample after it is obtained unless required for testing?

After a soil sample is obtained, it is essential to preserve its original properties as much as possible until testing can be conducted. Further crushing or manual reduction of the sample before testing can alter its physical characteristics, such as particle size distribution and moisture content. This alteration may lead to inaccurate test results, as the sample's natural state is essential for reliable evaluations.

On the other hand, documenting the sample location, labeling the sample properly, and storing it in a cool place are practices that help maintain the integrity of the sample and ensure that the testing process is well organized and reliable. Proper documentation and labeling prevent confusion and allow for traceability, while appropriate storage conditions help prevent any changes in moisture levels or temperature that could affect the sample’s characteristics.