Comparison of approaches for the characterization of contamination at rural megasites |
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Authors: | Arno Rein Steffen Popp Steffen Zacharias Carsten Leven Martin Bittens Peter Dietrich |
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Institution: | 1.Department of Environmental Engineering,Technical University of Denmark,Kongens Lyngby,Denmark;2.UFZ, Helmholtz Centre for Environmental Research,Leipzig,Germany;3.University of Tübingen, Center for Applied Geoscience,Tübingen,Germany |
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Abstract: | The present work focuses on approaches for the characterization of subsurface contamination, which need to be reliable and
cost-effective, particularly for extended and remote areas aimed at being redeveloped. Requirements are discussed with respect
to specific conditions at megasites, in order to enable site valorization. In a case study, two approaches are compared, comprising
(1) conventional site investigation based on historical surveys and concentration measurements at monitoring wells installed
in areas suspected of being polluted and (2) the use of direct push (DP) methods covering the complete area. The DP investigation
provided information on the contamination distribution and yielded also important information on hydraulic conditions. Statistical
analysis of the results applying indicator kriging revealed that the conventional approach is markedly risky when decision-making
relies solely on historical and sparse data. The DP campaign remarkably reduced the uncertainty concerning the estimated occurrence
of polluted groundwater at the whole site. Furthermore, monitoring measurements are analyzed showing the possible importance
of temporal variability. Taking economical consideration into account, DP-based groundwater screening is recommended to obtain
either first or complementary information on the entire site. Based on these data, also locations for a long-term monitoring
could be selected if temporal variability is assumed relevant. |
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