The subject of the project is to investigate another - sev. outbreaks of residual contamination in the Modřec packaging plant, which has been contaminated with PCBs for 40 years. The project builds on previous AR projects and remediation of part of the complex where PCB core bearings were removed, but despite meeting the target. remediation limits, nadlim.konc.PCB still occurs in drainage waters, the origin of which is unclear and still had to remain in operation DKS. The risk is unacceptable mainly due to the threat to the importance of drinking water sources (V6 borehole in Polička).