Randle Reef Sediment Remediation Project

The Randle Reef site is the largest coal tar-contaminated sediment site in the Great Lakes. This paper presents a summary of the design for the Randle Reef Remediation Project, which involves dredging 500,000 cubic meters (654,000 cubic yards) of sediment and construction of a 7.5-hectare (18.5-acre) Engineered Containment Facility (ECF) for containment of the dredged material. Contaminants of concern are polycyclic aromatic hydrocarbons (PAHs), as well as metals and coal-tar nonaqueous-phase liquid (NAPL). The ECF will serve to isolate contaminated sediment beneath the containment facility and dredged from the Harbour and will provide new land for a near-shore island terminal and provide berths for deep draft vessels. A multi-layer cap will be constructed over the dredged material placed in the ECF. The remediation project includes many design elements which are summarized in this paper. Construction is anticipated to begin in 2014/15.