Operation and Maintenance
After the sand extraction, which ended in 2013, an adaptable monitoring frequency was suggested in the monitoring plan rather than a fixed frequency for monitoring.
Strategies
The government initially required yearly measurements during the first five years after extraction had ended, and subsequently every five years until no more changes are observed. The actual monitoring plan deviates from this requirement: it suggests to choose an adaptable frequency that enables an adequate description of the developments within the area and to show whether effects have vanished. The monitoring frequency can be adapted in agreement with the authorities (van Zanten et al., 2008).
Execution
The sand extraction for the Maasvlakte 2 is part of the 1st phase construction, which ended in 2013. The monitoring after sand extraction therefore started in 2013.