ABSTRACT
In the assessment of a multi-barrier system of re-
positories for storage of gas or disposal of hazardous
waste the geological and hydrogeological features of
the repository site are crucial as the safe confine-
ment of the stored media has to be guaranteed at
least not only for the operation phase but also for
long term periods depending on type of usage. Due
to their favourable transport and geochemical prop-
erties argillaceous rocks can act whether directly as
host rock or surrounding the repository as an impor-
tant constituent of the geological barrier system.
