ISO 18400-204:2017

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.