NF ISO 18400-204

ISO 18400-204:2017 contains guidance on soil gas sampling using- active sampling (adsorbents, filters, air containers), and- passive samplingapplied 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 sourcesrelevant 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.