O-Train Is Running Again

01/03/2024

This is a release from the City of Ottawa:

Mayor and Members of City Council

Carina Duclos

Acting General Manager

Infrastructure and Water Services Department

Date: January 2, 2024

ObjetStructural Inspection at St-Laurent Station

Tunnel

The purpose of this memorandum is to provide an update to Mayor and Members of Council on the structural inspection at the St-Laurent Station on Tuesday, January 2, 2024. As outlined in the memo provided by Transit Services Department on January 2, the Infrastructure and Water Services Department (IWSD) was notified of pieces of concrete debris along the track and conducted a condition assessment to identify the cause. Following the preliminary assessment and out of an abundance of caution, IWSD engaged a structural engineering firm to conduct a detailed inspection.

Results from the inspection confirmed delamination, which is the separation of the paste layer at the surface, creating an unbonded layer with the main slab. With direction and oversight from the structural engineer, sounding and scaling was conducted by a contractor to remove the small concrete pieces that had separated from the main slab.

The St. Laurent Bus Rapid Transit Station was constructed in the mid 1980’s. The lower-level tunnel accommodates Light Rail Transit (LRT) and consists of a series of single span concrete rigid frame structures with the upper-level platform partially located on its deck surface. It is not uncommon to see delamination and scaling required in a structure of this age and with this level of complexity.

Required work concluded at approximately 4:15 pm and a report from the structural engineer deemed there are no hazards, and the structure is safe to resume service. As a result, O-Train Line 1 service resumed shortly before 5 pm.

IWSD will continue to conduct routine condition assessments of the structure. Transit Services and IWSD will collaborate to determine the appropriate schedule for these inspections.

Should you have any questions about this information, please contact me at extension 16507.

Sincerely,

Carina Duclos

Acting General Manager

Infrastructure and Water Services Department

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