HEAD OF HYLEBOS-ADAPTIVE MANAGEMENT DURING SEDIMENT REMEDIATION

摘要

Major sediment remediation projects can take place over a large area, over an extended period of time, and involve a wide range of variable site conditions. Successful completion of such complex projects can be enhanced by a flexible management framework that encourages ongoing adaptation of the remediation methods through continuous gathering and review of performance data, followed up by real time method adjustments to improve the effectiveness of the remedial action. The application of adaptive management to sediment remedial actions provides a mechanism to improve the effectiveness of the planned action by learning from the outcomes of ongoing actions and modifying the actions to achieve the desired outcome, as well as a means to respond quickly to unanticipated conditions.One of the ways the Head of Hylebos Waterway sediment remediation project applied adaptive management was by the full-time observation of the dredging and subsequent sampling with concurrent adjustment of the dredging plan to improve the capture of impacted sediment and achieve a clean bottom throughout the dredging area. This approach resulted in 99% of the dredging area meeting the project chemical cleanup criteria, with 1 % of the area requiring capping to control a groundwater related impacts that could not be resolved by sediment removal.