Summary
As a public or private stakeholder involved in reclaiming wasteland and managing excavated soil in potentially polluted areas, improve your knowledge of urban soil quality with the support of BRGM using urban soil geochemical background values.
Analyse in-situ d’un sol pollué par fluorescence X (Auzon, Haute-Loire, 2011).

In-situ analysis of polluted soil by X-ray fluorescence (Auzon, Haute-Loire, 2011).

© BRGM

Issues and needs

In accordance with the ALUR Act, urban renewal must ensure that the reconstruction of an urban area takes place on the area it currently occupies and wasteland is re-qualified by reclaiming abandoned spaces, in order to stem the growing phenomenon of soil artificialisation and loss of agricultural land. However, the chemical characteristics of the soils are often poorly known, particularly in urban areas where soils have been affected by deposits due to various atmospheric emissions (factory discharge, road traffic, district and individual heating, etc.) and are often made up of backfill marked by previous activities.

In France, there are no regulatory guide values for distinguishing polluted from unpolluted soil. Soil diagnosis is based on a comparison of its quality with that of adjacent soils (for control purposes) and taking its uses into account. In addition, the recovery of excavated soil during rehabilitation works is subject to strict regulations. These two operations contribute to optimising urban development and planning current and future land use (agricultural, residential, etc.) while ensuring that the population is protected. They are based on knowledge of diffuse concentrations of elements or persistent substances in soils, both of natural and anthropogenic (human activity-related) origin: the soil geochemical background (SGB) of anthropogenic soils.

However, the current data do not cover the entire area. They mainly relate to rural areas and do not always meet the requirements of managers of polluted sites and soils.

Our added value

BRGM is the benchmark institution in the field of polluted sites and soils and supports the Ministry of Ecology in developing a national methodology for managing risks related to past pollution. Its interdisciplinary teams are involved in acquiring, pooling, processing and using soil quality data.

For this purpose, they have compiled a national soil analysis database (BDSolU) for determining the SGBs of anthropogenic soils in order to diagnose potentially polluted soils and recover excavated soil in urban areas. Carried out in collaboration with BRGM's network of partners (ADEME, INRAE, eOde and Mines ParisTech), this work is included in the programmes of the GIS SOL Scientific Interest Group.

With its knowledge and the experience of its geochemists, BRGM can help you map your area for the purposes of its rational development, for example by identifying priority areas that should be subject to special management measures. This approach can obtain support from the Urban History Inventories, which it also complements. It includes:

  • Using data already collected during previous soil surveys;
  • Acquiring new data to supplement the spatial grid of the area:
    • Establishing the sampling strategy, taking the spatial variability of substance concentrations into account;
    • Carrying out surveys and taking readings and samples;
    • Analysing metal-metalloids (lead, copper, zinc, chromium, mercury, nickel, arsenic, etc.) and persistent organic compounds (PCBs - polychlorinated biphenyls, dioxins and PAHs - polycyclic aromatic hydrocarbons).
  • Characterising SGBs for anthropogenic soils by statistical and geostatistical processing;
  • Producing three-dimensional maps and information systems of urban soil quality;
  • Identifying possible anomalies related to previous activities on different scales.

The data used are added to the BDSolU urban soil analysis database, improving overall knowledge of the land across France. Developers interested in this operation can obtain financial support from ADEME.

Cartographie géostatistique des teneurs en plomb du FPGA dans les sols urbains (Toulouse Métropole, 2019).

Geostatistical map of SGB lead levels in anthropogenic urban soils (Toulouse Metropolitan Area, 2019).

© BRGM

Technical and digital resources

References

Redevelopment of the L'Union site, Nord

Contact us

Would you like more information about this offer or would you like to use our services? Fill in this contact form. We will get back to you as soon as possible.
* Indicates required field

Your need

Your message

Your contact details

Validate the form

To validate this form, read our data protection policy and validate the security test to confirm that you are a human user.

About the personal data collected on this form

  • Purpose of the form: to enable BRGM to respond to a request for information you have made.
  • Users of the data provided: the departments in charge of communication and user of information systems reception, support and assistance, who may share the data with persons or departments concerned by your request in-house at BRGM and/or with subcontractors or service providers.

Your rights

Within the limits of the Regulation, in particular Articles 15 to 22 of the GDPR and having provided proof of identity, you have:

  • the right of information and access to your personal data,
  • the right to have your personal data rectified,
  • the right to delete or limit processing of your personal data.

To exercise these rights, please contact our data protection officer at: dpo@brgm.fr.
Any request that constitutes an abuse of current laws and regulations may be rejected.
More information on the policy for third-party personal data protection