Published August 2024. This document replaces the version published in December 2008.

This guide explains the purpose of laboratory testing, and highlights factors that may affect the validity and usefulness of the results obtained.

The results of laboratory tests on soil and rock samples have the potential to significantly affect the design, construction costs and even the success of construction projects. Selection of appropriate sampling methods and test types, and a competent ground investigation contractor and testing laboratory are therefore essential to ensure validity of the test results.

The notes are not intended to be fully exhaustive or be a substitute for national standards or other industry guidance.