The Timbre project shall overcome existing barriers to brownfield regeneration by developing and providing customised problem- and target-oriented packages of approaches, technologies and tools. A key Timbre target – dealt with in Working Package 4 – is an improvement of existing methods and technologies to support brownfield regeneration. Such aims can be accomplished by approaching methodological core topics such as intelligent remediation in terms of technologica l advancements with regard to phytoremediation and partial source removal technologies. Smart and efficient investigation technologies bring a very solid support for remediation assessments, with key inputs into site regeneration strategies. This document presents the knowledge status reached within WP4 in relation to the Timbre model sites in Szprotawa (Poland) and in Hunedoara (Romania). This document represents a brief version of Timbre’s Deliverable 4.1 “Updated site knowledge status (database and site model) as a result of integrated DP and SSP investigation (database and site models implementing updated information from DP/SSP and potentially plant investigations)”, which was due and delivered to the European Commission in March 2013. In the following, an overview is given for both sites; results are fully included in two GIS-based site models developed at IETU (Szprotawa site) respectively at UTCB (Hunedoara site) and are available as of publication of this report for all partners in the project. As on request, restricted data may be made available to selected interested parties. Please contact timbre-info@ufz.de for any requests and visit the projects website for further general information about the activities in WP4 and the Timbre project in general at www.timbre-project.eu