Fire Ventilation Upgrade - Second Exit Program - Four Stations Conceptual Layouts
Meeting Date: August 31, 2005
Subject: Fire Ventilation Upgrade - Second Exit Program - Four Stations Conceptual Layouts
It is recommended that the Commission receive for information the proposed conceptual layouts for second exits at College, Wellesley, Museum and Castle Frank Subway Stations.
Sufficient funds are included in the 3.9 Program – Buildings and Structures – Fire Ventilation Upgrade Project, (as set out on pages 715-729, State of Good Repair/Safety Category), of the TTC 2005-2009 Capital Program which was approved by City of Toronto Council on February 23, 2005.
A Fire & Life Safety Assessment Study was completed in 2002. This study of all existing stations was conducted to assess the requirement for second exits from the subway platforms. Fourteen stations were identified in the high priority category that require an alternate means of egress from the station platform. The second exit design principles (shown in Appendix A) were developed in consultation with the Fire Life Safety Code Consultant and reviewed by various TTC’s Departments and the City of Toronto Building Department. The principles were developed to be consistent with the requirements of the Ontario Building Code and NFPA130 with respect to second exits.
The work at the fourteen priority stations is included in the Fire Ventilation Upgrade project and construction for all fourteen stations is scheduled to be completed by 2011.
Various options have been developed for all fourteen stations. The options for these four stations have been evaluated by staff and the preferred options have been received favourably by the City of Toronto Planning Department. The preferred options at these four stations are being forwarded to the Commission for information prior to staff proceeding with the detailed design.
Four options were developed, including options with exits located in College Park Commercial Building, on the public right-of-way south of College Park Commercial Building and in Joseph Sheard Parkette.
The preferred option (shown in Appendix B) locates the exit building on the east side of Yonge Street in the Joseph Sheard Parkette which provides for the least amount of utility conflicts and does not depend on a development connection agreement. This exit will be available for daily usage. The estimated cost of the preferred option is $3.6 million.
Four options were developed. Three options include exits in the parkette on the north side of Dundonald Street and the other option includes the exit on the south side of the Dundonald Street right-of-way.
The preferred option (shown in Appendix C) includes an exit building on the public road allowance on the south side of Dundonald Street. This option does not intervene with the parkette on the north side of Dundonald Street and was requested by City Staff. This exit will be available for daily usage. The estimated cost of the preferred option is $2.3 million.
Three options were developed including exits at the south end of the platform into the north side of Queen’s Park.
The preferred option (shown in Appendix D) meets the second exit design criteria and has the least impact to the future fire ventilation installation. This exit will be available for daily usage. The estimated cost of the preferred option is $1.8 million.
Three options were developed exclusively on TTC property. The options included exits at either the east or west ends of the subway platform as well as into the existing bus platform.
The preferred option (shown in Appendix E) best meets all the second exit design criteria. The eastbound exit will be available for daily use. Due to operational constraints the westbound exit will be an emergency exit only. The estimated cost of the preferred option is $3.85 million.
The conceptual layouts for second exits for College, Wellesley, Museum and Castle Frank Stations are being provided for information.
May 31, 2005
Attachment: Appendices A to E
Second Exits Design Principles
a) Locate second exits to provide a means of egress that is remote and separate from the existing egresses,
b) Minimum width of stairwell to be 2.4 metres,
c) The stairs shall be sized to ensure the maximum air velocity does not exceed 11.1m/s (2,200 feet/minute), when fire ventilation fans are activated,
d) Locate second exit to provide a maximum “dead end” distance on platform level of 23 metres,
e) The design will consider the proximity of the exit to the vent shafts and the possibility of recirculation of contaminated air back into the station,
f) Where possible the exit shall be for “daily use” complete with,
- Exit turnstiles and emergency doors at street level.
g) Where a “daily use” exit is not possible the exit shall be an “emergency only” exit complete with,
- secure exit doors with latches interlocked to open on alarm on the platform and at street level.