FHWA TUNNEL LEAK ASSESSMENT, BOSTON CENTRAL ARTERY

The mission of the Federal Highway Administration Tunnel Leak Assessment Team (A-Team) for the Boston Central Artery Tunnel Project was as follows: 1) Review tunnel construction history with respect to water leakage control efforts; 2) Determine the nature and magnitude of the leakage; 3) Assess the effectiveness of the leakage control methods that have been used to date; 4) Assess the current and proposed methods for controlling leakage; and 5) Submit a report of the A-Team's technical findings and recommendations. The A-Team arrived in Boston on December 19, 2004 and conducted the assessment from December 20-22, 2004. The A-Team reviewed project documentation, conducted a nighttime field tunnel inspection, conducted interviews with those who are currently or have been involved with the project, held a closeout meeting, and prepared a report of their findings. This interim report contains data that were available as of March 23, 2005. In summary, the A-Team believes that the project is appropriately addressing the tunnel leaks. The September 15, 2004 Slurry Wall Breach appears to be isolated to a discrete section of the tunnel and primarily the result of poor quality control during construction. The project has successfully installed an interim repair and is actively designing the permanent fix while completing an investigation of all suspect slurry wall panels. The A-Team found that the project is continuing repair of the chronic low level leaks and is committed to completing all repairs before the project completion date to meet specifications for the tunnel. The A-Team will continue to monitor that work.

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 36 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00989283
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Apr 22 2005 12:00AM