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This document 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. This document 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). This document 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.