Soil gas

Gas occupying pore spaces in soil, which can be sampled to evaluate certain subsurface conditions.

Why it matters

Sampling depth, location, methods, and site conditions affect interpretation. A soil-gas result is not interchangeable with an indoor-air measurement.

In practice

A project example

Sub-slab samples help investigate a potential vapor pathway while indoor sampling addresses a different part of the question.

General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.