Port of Miami Tunnel
The $1.6B Port of Miami Tunnel Project is being developed as a Public-Private Partnership (PPP) using the finance-design-build-operate-maintain (DFBOM) or “concessionaire” project delivery model. The project, which includes excavation and support of two 42-ft-diameter tunnels beneath Biscayne Bay, is being constructed to directly connect Watson Island with the Port of Miami located on Dodge Island and to improve traffic flow in downtown Miami by reducing the number of trucks and buses on congested downtown streets. The large diameter tunnels will be excavated in extremely permeable oolitic limestone with cover as little as 18 feet.
During the review phase of the preliminary design, Lachel was contacted by Parsons Brinckerhoff and T.Y. LIN International/URS to provide an independent cost estimate for the tunnel (underground heavy civil) portion of the project. Lachel was subsequently asked to join an Independent Cost Estimating Team with URS (surface structures, bridges and roads) and Everett & Gerrish (tunnel systems) to develop a cost estimate for the entire project scope.
In addition to cost estimating services, Lachel performed a constructability review and prepared a report addressing the challenges facing tunnel construction. Lachel prepared an independent statistical risk assessment of 43 potential project risks, and utilized probabilistic cost estimating techniques to establish the range of probable costs associated with the identified risks. Prior to release of the preliminary design and procurement package, Lachel also reviewed the tunnel-related portions of the project design and construction criteria, the technical specifications, and the Geotechnical Baseline Report (GBR).