Skipped inspection, warning signs preceded falling concrete in LRT tunnel

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Skipped inspection, warning signs preceded falling concrete in LRT tunnel
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In this photo attached in an internal City of Ottawa email, chunks of concrete are seen along the train tracks at St-Laurent LRT station on Jan. 2, 2024.

This photo attached to an internal City of Ottawa email shows chunks of fallen concrete on the LRT tracks at St-Laurent station on Jan. 2.

A photo of St-Laurent LRT Station. City officials said deterioration was 'not uncommon' for a structure that dates back to the 1980s. The tunnel was used as a bus transitway before being converted for the Confederation Line. In the October 2020 inspection report obtained by CBC, inspectors noted "spalls, delaminations and cracks with efflorescence" , as well as an "active leakage" in that Joint G area. Similar concerns were noted on the bus terminal platform above that section, and included a "corroded cover plate," "perforated" steel curb armouring, wide cracks and spalling.

At the time, inspectors recommended repairing the concrete — specifically, scaling areas of delamination — over a timeframe of one to five years. The photo on the left shows 'severe delamination' of the concrete at 'Joint D' over the eastbound LRT track at St-Laurent station. The photo on the right shows 'very severe spall and delamination on the east side of Joint E' over the same track, recorded in 2020. The city says those specific areas were scaled down in January.

In fact, inspections weren't up to date because the city deferred a full inspection of the tunnel in 2022, according to the light rail regulatory monitor and compliance officer. Laberge told the commission he wasn't sure if the city would have caught the issue had it fully inspected the tunnel two years ago.

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