GEOTECHNICAL, GEOPHYSICAL, ENVIRONMENTAL AND HYDROGEOLOGICAL INVESTATIONS AT 44 GERRARD STREET EAST & 55 MCGILL AVENUE, TORONTO, ONTARIO

The project includes the renovation and transformation of the existing property at 44 Gerrard Street East (also at 55 McGill Avenue) into the Centre for Urban Innovation (CUI). The proposed renovation project consists of addition of two new buildings to the existing building referred to as “the north addition” and “the south addition”. The north addition is a three (3) storey building and the south addition is a five (5) storey building. Both the additions will have one level of 6m deep basement.

Sirati & Partners Consultants Limited (SPCL) was retained by the Capital Projects and Real Estate of Ryerson University to undertake geotechnical, geophysical, environmental and hydrogeological studies to facilitate design and construction of the above noted project.

PCL is employed as the General Contractor.

As part of the geotechnical, environmental and hydrogeological studies a series of boreholes and test pits were conducted at the site. The boreholes were advanced to depths ranging from 18.5 to 21.5m. All the boreholes were terminated on encountering bedrock. Five (5) test pits were also excavated to explore the depths/founding levels of the existing footings. Borehole and test-pit locations were provided by the client.

Whilst the geotechnical investigation provided sufficient information and parameters for design and construction of various components of the proposed buildings such as foundations, floor slab and permanent drainage, excavations and backfill, earthquake considerations, earth pressures and temporary shoring, the initial environmental screening revealed impacted soil at various locations across the site. As a consequence, additional Phase 2-ESA to include additional environmental soil and ground water sampling and testing was carried out for the purposes of delineation exercise.

SPCL was also informed by the Client that part of the north addition was historically covered by buildings which were demolished in the past in a non-controllable manner. No records were available to indicate presence or otherwise of any geotechnical hazards. Consequently, SPCL conducted a separate geophysical survey using Ground Radar method. The study identified areas of anomalies which require further additional intrusive fieldwork prior to the redevelopment of the area. 

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