The hydrogeological study can have several purposes:
- Determining the location of a water catchment and the protective perimeters to be set up around it;
- Accompanying the driller during drilling to ensure technical monitoring and avoid any risk of groundwater pollution during drilling;
- Monitoring groundwater quality, for example after depollution or near a water supply catchment;
- Impact assessment of development projects that may have an impact on groundwater;
- Assessment of groundwater pollution risks from industrial, agricultural or other sites;
- Study of soil-related risks when groundwater is contaminated;
- Draw up groundwater decontamination plans and monitor their implementation.
Missions carried out by Letourneur Conseil :
Letourneur Conseil relies on a qualified team and competent collaborators to carry out missions concerning the following hydrogeological studies:
- Hydrogeological study for the installation of a piezometer or the creation of a water catchment :
The hydrogeological study is based on a site visit to identify important elements of the landscape, followed by a documentary study, then soil sampling if necessary, to determine the location of the piezometer and the catchment. The structure is then installed by one of our suppliers under our supervision.
- Hydrogeological context of impact studies
As part of a construction or redevelopment project, it is mandatory to study the impact on groundwater using a hydrogeological study. This impact study may form part of a water law dossier (DLE).
- Diagnosis of groundwater pollution (sampling campaign) missions A230 and DIAG
Letourneur Conseil is also involved in site pollution diagnostics, in cases where the water table may be impacted, or if the groundwater is at risk of contamination, a hydrogeological study is required. This will be part of a pollution diagnosis (DIAG mission), which will consist of a preliminary study to set up piezometers, followed by water sampling (A230) and interpretation of the results (A270). In this case, the hydrogeological study also involves levelling the piezometers to produce a piezometric map.
- Hydrogeological groundwater monitoring SUIVI and BQ missions
A hydrogeological study can also be carried out as part of an environmental groundwater monitoring program (SUIVI mission). Such monitoring is carried out, for example, after groundwater decontamination work, in order to monitor water quality over a 4-year period. At the end of this period, a Quadrennial Assessment (Bilan Quadriennal - BQ) is carried out to determine whether the depollution has been successful.