Response zone
Glossary of common terms used in the management of land contamination, published on the Planning Portal, defines the response zone as: ‘The perforated section of standpipe which allows gas in the unsaturated zone or groundwater below the water table to enter a standpipe.’
The response zone is typically located at the depth where the parameter of interest (e.g., water level, gas concentration) is expected to be measured. It is positioned based on site-specific conditions, such as the depth of the water table or the presence of contamination.
The response zone is made of a perforated or slotted section of the standpipe, which permits fluid or gas to enter. Surrounding the slotted section there is often a filter pack (e.g., gravel or sand) that helps prevent fine particles from clogging the standpipe while allowing water or gas to flow freely.
It facilitates accurate measurement of groundwater levels, sampling of groundwater, or the detection of ground gases. The response zone isolates the specific depth of interest to avoid interference from other layers or zones. To ensure that the response zone only interacts with the desired geological stratum, bentonite or other sealing materials are placed above and below the response zone. This prevents cross-contamination or flow between different layers of soil or rock.
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