FLTF Shares Insights on Interim Forensic Team Report
Since the release of the interim Independent Forensic Team (IFT) report, Four Lakes Task Force and its consulting engineers have conducted their review of the report to get a better understanding of how the team formed its conclusions.
We must consider and satisfactorily address all failure modes that can be contemplated during Potential Failure Modes analysis, which will be done after 60% design and again with the contractor before construction to improve dam safety.
The designs that are being brought forward at 30% design, and near 60%, will consider the IFT reports and other data factors we are observing through our studies and engineering.
We will likely invest in an additional study and remain conservative in our design basis criteria in spillway and embankment design. The amount of $215 million for restoration of all Four Lakes and dams is still the planning number for construction, with an overall project cost of $250 million. It is unlikely this number will be lower in the next phase of estimates. It is yet to be determined whether conducting this additional study will impact the timelines.
The image above shows planned soil boring locations near the Edenville Dam. Below are images of soil boring at Secord Dam.