In Situ Remediation Technologies - Dealing with Contaminated Sites: From Theory Towards Practical Application - page 970

harbour

polders

E3

E1

E2

Pleistocene
aquifer

Fig. 21.7 Example of a Megasite conceptual site model; The Rotterdam Harbour example is pre-
sented here. The planes of compliance refer to conceptual boundaries that should not be affected
by contamination

of aquifer of The Rotterdam Harbour (in % of total area) that exceeds the Dutch
Intervention Value as a function of time is given, as an example of the results from a
Megasite Risk Assessment. For the Antwerp Harbour this situation was completely
different. Here, all risks were associated with emissions from shallow groundwa-
ter to surface water and not to deeper groundwater systems. This was due to the
presence of the aquitard “Boomse clay” at a depth of 10 m below surface level.
This shows that a thorough system understanding is required for adequate Risk
Assessment and following Risk Management steps.

impact on 2nd plane of compliance
(autonomous situation)

14

12

10

8

6

4

2

0

1980 2000 2020 2040 2060 2080 2100

30th percentile 50th percentile 70th percentile

Fig. 21.8 Area of aquifer of The Rotterdam Harbour (in % of total area) that exceeds the
Intervention Value as a function of time, as an example of the results from a Megasite Risk
Assessment