HAL Group Inc. was retained by ONTrack Alliance on behalf of Metrolinx to undertake targeted destructive investigations in support of critical design decisions for the Union Station Enhancement Project. The work focused on verifying the existing condition and material characteristics of reinforced concrete components within this highly constrained and operational environment.

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CRITICAL INFRASTRUCTURE ELEMENTS

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The scope of work included investigations at several key structures: the Bay Street Bridge, Yonge Street Bridge, York Street Bridge, and Structure South. These locations represent critical elements of the Union Station infrastructure, requiring careful coordination and precision to maintain safety and minimize disruption.

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SPECIALIZED INVESTIGATION

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HAL played a central role in concrete coring, localized concrete removal, and steel reinstatements, including steel sampling. Investigations were carried out at pier columns, arches, abutments, soffits, and other structural elements to ensure a comprehensive understanding of existing conditions.​

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ADVANCED TESTING AND SURVEY METHODS

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Half-cell potential surveys were conducted at select locations to assess corrosion activity. Ground Penetrating Radar (GPR) scanning was performed at all test areas prior to concrete extraction to accurately locate reinforcing steel. Extracted core samples were tested for cement content, petrographic characteristics, compressive strength, and carbonation depth.

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TAILORED SOLUTIONS FOR COMPLEX CONDITIONS

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Given the unique challenges and constraints at each work location, HAL developed custom work plans and methodologies to address site-specific conditions. This tailored approach ensured safe execution, high-quality data collection, and reliable results to support the project’s design and rehabilitation objectives.

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