Updated Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum

Metrolinx Updated Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum Prepared by: AECOM Canada Ltd. 105 Commerce Valley Drive West, 7th Floor Markham, ON L3T 7W3 Canada T: 905.886.7022 F: 905.886.9494 www.aecom.com Date: August 2020 Project #: 60617139 Metrolinx – Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum Statement of Qualifications and Limitations The attached Report (the “Report”) has been prepared by AECOM Canada Ltd. (“AECOM”) for the benefit of the Client (“Client”) in accordance with the agreement between AECOM and Client, including the scope of work detailed therein (the “Agreement”). The information, data, recommendations and conclusions contained in the Report (collectively, the “Information”): ▪ is subject to the scope, schedule, and other constraints and limitations in the Agreement and the qualifications contained in the Report (the “Limitations”); ▪ represents AECOM’s professional judgement in light of the Limitations and industry standards for the preparation of similar reports; ▪ may be based on information provided to AECOM which has not been independently verified; ▪ has not been updated since the date of issuance of the Report and its accuracy is limited to the time period and circumstances in which it was collected, processed, made or issued; ▪ must be read as a whole and sections thereof should not be read out of such context; ▪ was prepared for the specific purposes described in the Report and the Agreement; and ▪ in the case of subsurface, environmental or geotechnical conditions, may be based on limited testing and on the assumption that such conditions are uniform and not variable either geographically or over time. AECOM shall be entitled to rely upon the accuracy and completeness of information that was provided to it and has no obligation to update such information. AECOM accepts no responsibility for any events or circumstances that may have occurred since the date on which the Report was prepared and, in the case of subsurface, environmental or geotechnical conditions, is not responsible for any variability in such conditions, geographically or over time. AECOM agrees that the Report represents its professional judgement as described above and that the Information has been prepared for the specific purpose and use described in the Report and the Agreement, but AECOM makes no other representations, or any guarantees or warranties whatsoever, whether express or implied, with respect to the Report, the Information or any part thereof. Without in any way limiting the generality of the foregoing, any estimates or opinions regarding probable construction costs or construction schedule provided by AECOM represent AECOM’s professional judgement in light of its experience and the knowledge and information available to it at the time of preparation. Since AECOM has no control over market or economic conditions, prices for construction labour, equipment or materials or bidding procedures, AECOM, its directors, officers and employees are not able to, nor do they, make any representations, warranties or guarantees whatsoever, whether express or implied, with respect to such estimates or opinions, or their variance from actual construction costs or schedules, and accept no responsibility for any loss or damage arising therefrom or in any way related thereto. Persons relying on such estimates or opinions do so at their own risk. Except (1) as agreed to in writing by AECOM and Client; (2) as required by-law; or (3) to the extent used by governmental reviewing agencies for the purpose of obtaining permits or approvals, the Report and the Information may be used and relied upon only by Client. Metrolinx – Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum AECOM accepts no responsibility, and denies any liability whatsoever, to parties other than Client who may obtain access to the Report or the Information for any injury, loss or damage suffered by such parties arising from their use of, reliance upon, or decisions or actions based on the Report or any of the Information (“improper use of the Report”), except to the extent those parties have obtained the prior written consent of AECOM to use and rely upon the Report and the Information. Any injury, loss or damages arising from improper use of the Report shall be borne by the party making such use. This Statement of Qualifications and Limitations is attached to and forms part of the Report and any use of the Report is subject to the terms hereof. AECOM: 2015-04-13 © 2009-2015 AECOM Canada Ltd. All Rights Reserved. Metrolinx – Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum Authors Report Prepared By: Madelin Blacha Environmental Planner Report Reviewed and Approved By: Megan Ketchabaw Environmental Planner Metrolinx – Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum Executive Summary Metrolinx has proposed an amendment to the Scarborough Subway Extension (SSE); hereafter referred to as ‘the Project’, resulting in an extension of the proposed alignment, two new stations, and a revised station location at Scarborough Centre. The Environmental Project Report (EPR) Addendum has been prepared following the Transit Project Assessment Process (TPAP), as prescribed in Ontario Regulation (O. Reg.) 231/08 (amended June 30, 2020), hereafter referred to as ‘O.Reg. 231/08’, under the Environmental Assessment Act. More information related to the study process is provided in Section 3. ES1. Study Purpose In April 2019, the Ontario Government announced funding for transportation improvements to four subway networks, which included an amendment to the SSE. On June 6, 2019 the Province of Ontario enacted Bill 107 which, in part, amended the Metrolinx Act, 2006 to identify Metrolinx as being solely responsible for the design, development or construction of a prescribed rapid transit project. Amendments to the SSE included an extension of the alignment, two new stations, and a revised station location at Scarborough Centre. As a result of these changes, the SSE will extend further north into Scarborough and provide more transit connections. The Project will reduce travel times and improve access to jobs, schools and other destinations in more communities in Scarborough. This extended alignment will provide relief and new opportunities for Scarborough residents travelling to and from the downtown core. It will provide connections to GO Transit and the Eglinton Crosstown Light Rail Transit at the existing Kennedy Station, and connections to GO buses and Durham Region Transit and Scarborough Town Centre. The alignment extension further north also provides the potential for a connection to a future Sheppard Subway (Line 4) extension. These changes to the Project were determined to be inconsistent with the 2017 EPR and were deemed to be significant, warranting an Addendum to the EPR. As described in Section 15 of O. Reg. 231/08, any change that is inconsistent with a previously approved EPR requires a reassessment of the impacts associated with the change, the identification of potentially new mitigation measures, and potentially new monitoring systems in an Addendum to the previously approved EPR. The purpose of this EPR Addendum is to document these requirements as prescribed in Section 15 of O. Reg. 231/08. i Metrolinx – Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum ES2. Update to the Project Description The proposed design changes assessed in this EPR Addendum include: Alignment − Subway line extended from Scarborough Centre to Sheppard Avenue East; and − Alignment shifted east, to be located within the McCowan Road right-of- way, from approximately 1080 McCowan Road to just south of Highway 401 (eastbound exit ramp). Stations and Ancillary Features − New terminal station at Sheppard Avenue East and McCowan Road with a Passenger Pick-Up and Drop-Off (PPUDO); − Revised location of the station at Scarborough Centre; − New station at Lawrence Avenue East and McCowan Road; − Ancillary features located at stations, including vent shafts and traction power substations (TPSS); − New bus loop north of the station at Lawrence Avenue East; and − Addition of pocket tracks east of Kennedy Station. Emergency Exits1 − New emergency exit building (EEB) locations along the alignment extension (EEBs 7 and 8); and − Revised EEB 5 location. Traction Power Substations − Removed TPSS 2 in the Gatineau Hydro Corridor, given that a TPSS will be located at the station at Lawrence Avenue East. Construction − Tunnel boring machine (TBM) launch shaft at Eglinton Avenue East and Midland Avenue; − TBM launch shaft at the terminal station location at Sheppard Avenue East; − TBM extraction shaft at the station location at Lawrence Avenue East; and 1. The 2017 EPR EEB 7 has been renamed to EEB 6 and is not considered a design change associated with this EPR Addendum. ii Metrolinx – Environmental Project Report Addendum Scarborough Subway Extension Updated Environmental Project Report – 2020 Addendum − Additional cut and cover construction, east of Kennedy Station to Midland Avenue, for tail tracks construction. A comparison between the various project components for the 2017 EPR

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