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Built Heritage Resources & Cultural Heritage Landscapes - Yonge North Subway Extension

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Key Findings

A total of 86 heritage properties, including built heritage resources and cultural heritage landscapes were identified within the Study Area. Identified heritage properties include:

  • Six properties designated under Part IV of the Ontario Heritage Act:
    • 10 Colborne Street
    • 7780 Yonge Street, Robert West House (subject to Ontario Heritage Trust easement)
    • 7788 Yonge Street, George Munroe House
    • 42 Old Yonge Street, William Walton Armstrong House
    • 8038 Yonge Street, Soules Inn
    • 23 Hillsview Drive, David Dunlap Observatory Lands
  • Two Heritage Conservation Districts (HCDs) designated under Part V of the Ontario Heritage Act :
    • Thornhill Vaughan HCD (39 properties within the Study Area)
    • Thornhill Markham HCD (15 properties within the Study Area)
  • Three listed heritage properties:
    • 5926 Yonge Street, City of Toronto Heritage Register
    • 5 Patricia Avenue, City of Toronto Heritage Register
    • 7951 Yonge Street, Edwardian House, City of Markham Heritage Register
  • One Previously Identified Heritage Property
    • 5925 Yonge Street

map of Boundary of the Thornhill Vaughan HCD

Figure 1: Boundary of the Thornhill Vaughan HCD

Potential Effects & Mitigation Measures

Potential Effects:

Construction Phase

  • No impacts are anticipated to 29 built heritage resources/cultural heritage landscapes. Continued avoidance of these properties is recommended.
  • Potential indirect impacts: Vibration damage related to the construction of the Project in the vicinity of a built heritage resource or cultural heritage landscape may occur at 43 properties.
  • Potential direct impacts: Above-grade Project components are planned within, or adjacent to, 14 built heritage resources/cultural heritage landscapes. Vibration damage may also occur at these properties.

Operational Phase

  • No impacts to identified BHRs/CHLs are anticipated as a result of project operations.

heritage house on hill

Figure 2: 15 Patricia Ave.; Listed on City of Toronto Heritage Register

heritage house on hill

Figure 3: 7951 Yonge Street; Edwardian House

Mitigation Measures:

Construction Phase

Where impacts are anticipated due to potential vibration impacts:

  • In all cases, avoidance of the built heritage resources or cultural heritage landscapes is the preferred mitigation measure; only where avoidance was determined to not be feasible were mitigation measures prepared.
  • Document (review and establish) the structural condition of the affected buildings to determine if they are vulnerable to vibration impacts from construction activities.
  • Establish vibration limits based on structural conditions, founding soil conditions and type of construction vibration to ensure no damage to heritage structures.
  • Implement vibration mitigation measures on the construction site and/or at the building.
  • Monitor vibration during construction, with notification by audible and/or visual alarms when limits are approached or exceeded.

Where a direct impact such as demolition or alteration to a heritage property may occur:

  • Complete technical studies, which may include Cultural Heritage Evaluation Reports and/or Heritage Impact Assessments for known or potential BHRs/CHLs where potential direct impacts such as demolition or alteration of heritage structures/landscapes may occur, as required. These studies will determine cultural heritage value or interest and provide a detailed impact assessment, conservation guidance, and property-specific solutions to mitigate Project impacts. Properties requiring such studies will be confirmed as project design progresses and property-specific impacts are identified.
  • Consult with the MHSTCI, OHT, municipalities and other stakeholders as required.

Mitigation Measures:

Operational Phase:

No impacts to BHRs/CHLs are anticipated during Project operations, therefore no mitigation is required.

map displaying Inventory of Built Heritage Resources and Cultural Heritage Landscapes<br />

Figure 4: Inventory of Built Heritage Resources and Cultural Heritage Landscapes

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