Contamination of soil and groundwater at a former industrial site in Trondheim,Norway |
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| Institution: | 1. School of Naval Architecture and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. College of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China;3. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;1. Dutch Institute for Clinical Auditing, Leiden, The Netherlands;2. Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands;3. Department of Surgery, Medical Center Haaglanden, The Hague, The Netherlands;4. Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, The Netherlands;5. Mathematical Institute, Leiden University, Leiden, The Netherlands;6. Department of Surgery, Academic Medical Center, Amsterdam, The Netherlands;7. Department of Surgery, Erasmus Medical Center, Rotterdam, The Netherlands;8. Department of Surgery, University Medical Center Utrecht, Utrecht, The Netherlands;9. Department of Surgery, Radboud University Medical Center, Nijmegen, The Netherlands;10. Department of Surgical Oncology, The Netherlands Cancer Institute – Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands;1. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. College of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China;3. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | This paper describes an investigation carried out in 1990 by the Geological Survey of Norway into the contamination of soils and groundwater at a former industrial site. The site covers an area of 0.5 ha and was used for a small plant generating gas for lighting purposes and from the middle of the last century for a small electrochemical facility (The Nidelven Brass and Iron Co. Est. 1843). The site is located immediately adjacent to the Nidelva river, in the central area of the city of Trondheim (pop. 150,000), Norway. Soil samples were obtained from 10 boreholes drilled to approximately 4 m depth. Analysis of the heavy metal content of these soil samples was subsequently undertaken. A subset of the samples was analysed for tar, including polycyclic aromatic hydrocarbons (PAH). The concentrations of Cd, Co, Cr, Hg, Ni and PAH in the soils are all below the maximum permissible levels recommended by the authorities. In certain localities, however, the concentrations of Cu, Pb and Zn are higher than the action levels at which remediation is required. It is estimated that approximately 4400 m3 of soil are contaminated, but that the contaminants are bound so tightly to the soil that the risk of dispersion of the pollutants is negligible.Groundwater samples were also collected from 4 monitoring wells installed at the site. Analysis of these groundwaters indicated the presence of only slightly contaminated groundwater. With the exception of 1 sample with a slightly higher concentration of Cu, the concentrations of PAH and the trace metals Co, Cr, Cu, Hg, Ni and Zn in the groundwater were below natural background values. This confirms the results from the soil analyses in which it was concluded that the dispersion of contaminants is negligible. A TCLP-extraction of 5 soil samples with high concentrations of Cu, Pb and Zn showed that only Zn was released in amounts exceeding the water guidance levels requiring monitoring.This study therefore indicates that the contaminants found in the ground at the site are strongly bound to the soil and are unlikely to be mobilised. This, combined with a slow base-flow, causes an insignificant contamination contribution to the waters in the River Nidelv. It should be noted, however, that the leaching experiments were not undertaken on the samples containing the highest Cu, Pb and Zn concentrations. |
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