Geoelectric monitoring of bentonite barrier resaturation in the Äspö prototype repository : final report / GRS, Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH ; Klaus Wieczorek, Michael Komischke, Rüdiger Miehe, Helge Moog ; this report was prepared under contract no. 02 E 9944 of the German Federal Ministry for Economic Affairs and Energy (BMWi)