Peninsula Harbour, Ontario, Canada
Sediment Remediation Project

The Peninsula Harbour Sediment Remediation Project, administered by Environment Canada and Publics Works Government Services Canada (PWGSC), involved Enhanced Natural Recovery (ENR) by thin layer capping of Mercury- and PCB-contaminated sediments at the former Marathon Pulp and Paper Mill Marine Operable Unit. Located in Jellicoe Cove, northern Lake Superior, the mill produced bleached kraft pulp from 1946 until 2009, with discharge of both treated and untreated effluent to the lake during this timeframe.

Lally Consulting LLC (Lally LLC) was approached to team with AECOM in responding to an RFP for the Peninsula Harbour Environmental Remediation Project. The project conditions and selected remedy were very similar to the Ward Cove Sediment Remediation Project at the former Ketchikan Pulp Mill facility in Ketchikan, Alaska, for which Lally served as the project construction manager and site design engineer. Our team was successful and selected by Environment Canada and PWGSC to develop the project design and oversee its construction.

Lally LLC participated in the planning phase assisting with field investigations to assess conditions for development of marine geotechnical and remote sensing surveys, the cap design, and construction planning, including identifying local cap material sources and suitable barge loading facilities. During the design phase Lally contributed to development of the cap layout and engineering details, technical specifications, construction monitoring plan, post-construction monitoring plan, and cost estimates. Inputs were also provided with respect to further design definition, completeness, constructability, sustainability and risk management.

For implementation planning, Lally LLC provided construction methods guidance, optimal cap thickness verification techniques, and construction sequencing recommendations.

During the project construction, Lally oversaw test phase remedial construction on site, shared knowledge with the project team and continued to provide project quality assurance, engineering, production monitoring and construction oversight support during full scale implementation, on site and remotely. Other support provided during the project implementation phase included;

Cap construction went smoothly over the duration of the project. The capping work was completed 25 days ahead of schedule and under budget, which allowed for an additional 30,000 sq. m of Monitored Natural Recovery area to receive thin layer cap material for Enhanced Natural Recovery.

Support Services Provided

Technical Proposal Development

Site Investigation

Cap Material Sourcing

Sediment Characterization and Surveys

Sediment Remediation Engineering

Cap Construction and Performance Optimization Guidance

Construction Oversight and Construction Quality Assurance

Location

Marathon, Ontario, Canada

Period

2009 – 2012

Related Project

Let's Stay in Touch

Join our Mailing List for Occasional News and Announcements.