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Multi-Method Exploration of Contaminated Sites for a Sustainable Land Use

Abstract:

Built in the early 20th century, many abandoned or inactive industrial sites are nowadays located centrally. Due to rapid urban expansion the former outskirts are now attractive residential quarters close to the Cental Business District. Similarly, some industrial sites are being developed, if they are not potentially contaminated. Such a change of use - from industrial to residential - requires evidence of innocuousness thus, a site investigation and, if needed, remediation measures. As this may cause unpredictably high investments investors swerve to the open countryside, which is, however, an unsustainable utilisation of land. Remediation of contaminated sites at optimal cost requires a profound exploration of the site. In many cases the Cone Penetration Test (CPT) is a useful investigation tool. In addition, a huge number of geochemical and geophysical methods may be used to detect subsurface anomalies and to identify them as pollutants. The goal of this project is to focus on a few selected methods of exploration and to develop a low-cost survey with optimised information content in combining and modifying known techniques in a new way. Since CPT may create additional flow paths for contaminants our new approach relies on fewer holes and is aiming at their most effective re-use. This includes soil-air probing and the application several non-invasive geophysical techniques, such as hole-to-surface and cross-hole radar tomography and electrical resistivity tomography. Depending on number and type of contaminants and the geological surroundings, different probes and survey techniques are chosen to illustrate parameters of interest with depth. In this way 3-D imaging of the subsurface seems within reach whereas the long term goal of the project includes the 4-D monitoring of contaminants.

Authors:

Friedel, Sven and Wotschke, Peter and Hermanns Stengele, Rita

Index Terms:

Soil; contaminated sites; SoilGroup; ClayGroup; Friedel, Sven; Hermanns Stengele, Rita; Wotschke, Peter

Further Information:

Date published: 16.05.2003