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  • Tunnel Rehabilitation
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WMATA Steel Tunnel Liner Structural Investigation

Washington Metropolitan Area Transit Authority (WMATA)

A section of the WMATA tunnels on the Yellow Line in Washington DC near L’Enfant Plaza Station was constructed utilizing steel lining segments. During our Leak Remediation Inspection work, it was noted that severe corrosion and section loss were present on many of the segments, particularly below spring line. The project team recommended, and WMATA agreed to conducting detailed inspections and measurements of the steel thickness, and developing a recommendation for an engineered solution. Each steel segment ring element was inspected panel by panel, and material thickness was tested at randomized locations where severe corrosion was noted. A report summarizing these findings, the structure history, rehabilitation alternatives, and recommended approach was prepared and submitted to WMATA.

GEC On-Site Inspection Support Services:

Gall Zeidler Consultants (GZ), as part of the GEC team, coordinated inspection tasks with WMATA personnel and provided inspection staff for the evaluation and documentation of the conditions of the steel panels and associated features (e.g. bolts, ribs, etc.). GZ also participated in developing the report summarizing the inspection findings, suggesting remediation methods, and providing remediation recommendations.


Washington, D.C.


2018 – Present


Twin-running tunnels


~950 feet


Single Bore Steel Lined Tunnels


Saturated Sand and Clay


Gannett Fleming – Parsons Transportation Group JV (GFP)


Washington Metropolitan Area Transit Authority (WMATA)