...
Reducing
...
complexity
...
The
...
development
...
of
...
a
...
Conceptual
...
Model
...
for
...
the
...
megasite
...
is
...
a
...
crucial
...
step
...
of
...
the
...
Integrated
...
Management
...
Strategy
...
(IMS).
...
It
...
is
...
the
...
simplified,
...
schematic
...
representation
...
of
...
the
...
megasite,
...
which
...
includes
...
a
...
source-pathway-receptor
...
approach,
...
as
...
well
...
as
...
the
...
main
...
characteristics
...
of
...
the
...
risk-based
...
management
...
approach.
...
It
...
therefore
...
represents
...
a
...
working
...
model
...
under
...
continuous
...
development
...
in
...
the
...
subsequent
...
sections
...
of
...
the
...
IMS.
...
At this stage only the basic information already available should be used. Most of the knowledge needed for the conceptual model build-up is obtained mainly through expert judgment instead of data files and megasite databases (see: Starting IMS -> Inventory of information).
The conceptual model is developed to obtain a first insight into the associated risks and possible scope of the problem and to help define general priorities within the megasite (see figure below). The conceptual model should be regarded as a representative tool for discussions with the stakeholders about the IMS and, as a consequence, about the determination of the preliminary boundaries for the Risk Management Zone (RMZ), further actions, management scenarios and investments. (see: Risk assessment -> Megasite characterization).
Output
The output of this step is the conceptual model for the megasite that assists in understanding the relevant environmental problems.