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ISO 18400-204:2017

Soil quality - Sampling - Part 204: Guidance on sampling of soil gas

ISO 18400-204:2017 contains guidance on soil gas sampling using

- active sampling (adsorbents, filters, air containers), and

- passive sampling

applied at permanent or temporary monitoring wells or other installations in soils or underneath buildings (sub-slab).

It provides guidance on:

- development of a sampling plan;

- construction of monitoring installations;

- transport, packaging and storage soil gas samples;

- quality assurance.

ISO 18400-204:2017 also gives basic information about

- soil gas dynamics, and

- identification of soil gas sources

relevant to permanent or temporary boreholes in soils or underneath buildings (sub‑slab).

The compounds covered by this document are:

. volatile organic compounds (VOCs);

. inorganic volatile compounds (e.g. mercury, HCN);

. permanent gases (i.e. CO2, N2, O2, CH4).

ISO 18400-204:2017 does not give guidance on:

- risk evaluation and characterization;

- selection and design of protective measures;

- the verification of protective measures, although the site investigation methodologies described can be used when appropriate;

- the sampling of atmospheric or indoor gases;

- the measurement of gases from the soil entering into the atmosphere;

- monitoring and sampling for radon.

Content Provider
International Organization for Standardization [ISO]


As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.