GO Expansion – New Track & Facilities TPAP

Proposed Don Valley Layover Facility - City of

Metrolinx has revised the configuration of the Don Valley Layover after receiving feedback from the public and other stakeholders during past public meetings. This reconfiguration is intended to reduce impacts to adjacent property owners, affected utility companies, and users of the Lower Don Valley Trail. is a bottleneck in the GO network. By situating a layover site on the Don Branch, trains will be allowed to quickly and efficiently drop passengers at Union Station, while at the same time improving movement and reducing congestion. The site is ideally located relative to Union Station to allow for off-peak train storage. GO Expansion – New Track & Facilities TPAP

Proposed Don Valley Layover Facility - City of Toronto

Design Elements: • Train traction servicing: wayside power • Storage for 3 GO Trains • Crew Services, Sanitary Storage and Staff Parking • Connection to mainline track • Entrance off ramp to / Revised Design Elements: has revised the design of the Don Valley Layover since the previous round of public consultation to reflect stakeholder feedback.

Proposed Site Plan GO Expansion – New Track & Facilities TPAP

Proposed Don Valley Layover Facility - City of Toronto

Characteristics of the site: • Metrolinx owns the Don Branch rail corridor that runs parallel to the Don Valley Parkway • The Don Branch rail corridor is currently not operational • The track storage infrastructure will be located on Metrolinx’s existing property • Additional property will be required for crewing services, wayside power, staff parking, etc. • Road improvements to access the property may be required • Protection of Don Valley Trail and connectivity to the surrounding community will be maintained during and following construction

Existing Site GO Expansion – New Track & Facilities TPAP

Proposed Don Valley Layover Facility - City of Toronto

A series of renderings illustrating the proposed Don Valley Layover Facility are pending and will be uploaded as soon as they are available.

The site: • The Don Valley layover site is located within the Don Valley watershed adjacent to a City of Toronto Environmentally Significant Area (Don Valley Central Section) • Metrolinx will ensure that all the proposed environmental mitigation measures, monitoring and management plans are adhered to during construction to prevent, avoid, or mitigate any impacts to the environment. The revised layover configuration: • Locates facilities outside of lands designated as Environmentally Significant Areas by the City of Toronto • Removes facilities from beneath the Prince Edward , allowing easier access for maintenance • Access to the local road network remains unchanged from what was presented during the previous round of consultation. GO Expansion – New Track & Facilities TPAP

Effects and Proposed Mitigation Measures Proposed Don Valley Layover Facility - City of Toronto

Type of Effect Description of Potenial Effects Proposed Mitigation Measure

• A Drainage and Stormwater Report, an Erosion and Sediment Control Plan and detailed drainage design and erosion and • The proposed access road is located in close proximity to sediment control drawings will be prepared. the , which may result in potential challenges with • Requirements for stormwater quantity and quality controls will be erosion and sediment control. Stormwater carefully reviewed and implemented as required. • The proposed layover requires approximately 40 meters of Management • A hydraulic assessment will be completed for the adjacent Don retaining wall, which will result in greater disruption to existing River prior to construction to determine potential flooding effects drainage patterns and additional challenges with temporary and further mitigation measures. drainage management during construction. • Further mitigation measures for flooding will be determined in consultation with regulatory agencies and local authorities.

• Relative increase in retaining walls will result in increased • As part of detailed design, efforts will be made to minimize visual visual disturbance. impacts as much as possible. Visual • Potential impacts on the composition and character of current • A Design Excellence process will be followed to integrate the new views along the Lower Don Valley Trail and surrounding park infrastructure design into the existing environment to reduce the space. extent of visual impacts. GO Expansion – New Track & Facilities TPAP

Effects and Proposed Mitigation Measures Continued Proposed Don Valley Layover Facility - City of Toronto

Type of Effect Description of Potenial Effects Proposed Mitigation Measure

• Tree/Vegetation removal or injury, compensation and permitting/ approvals (as required) will be undertaken in accordance with Metrolinx’s Vegetation Management Guidelines and Tree Removal Strategy. • Performing vegetation removal outside the typical breeding period for birds with consideration of potential occupation of treed roosts • Greater vegetation removals are required for the revised (individual trees) by bats and Milkweed by Monarch caterpillars layover configuration since facilities have been sifted away from March to September. Natural from the already-disturbed areas beneath the Prince Edward Environment Viaduct. • An Integrated Vegetation Management Plan will be developed and implemented in accordance with Metrolinx’s Vegetation • Proposed infrastructure is now closer to wetland areas, Management Guidelines and Tree Removal Strategy. increasing the potential for impacts during construction. • To avoid potential impacts related to storm drainage discharge to the Don River, including water quality and erosion control, Metrolinx is exploring integrating Low Impact Development (LID) measures into the stormwater management design. • A Construction Monitoring Plan will be developed with site- specific mitigation measures and regularly monitored for. GO Expansion – New Track & Facilities TPAP

Effects and Proposed Mitigation Measures Continued Proposed Don Valley Layover Facility - City of Toronto

Type of Effect Description of Potenial Effects Proposed Mitigation Measure

• Construction of the proposed layover site, including its various components (buildings, layover yard tracks, parking area, • Baseline vibration monitoring will be completed to ensure the is not affected by construction. Cultural Heritage fencing) has the potential to have negative indirect effects on the Prince Edward Viaduct, which is a known cultural heritage • Staging areas should be selected so that they are non-invasive resource, through soil disturbance, potential vibration effects and avoid heritage attributes. and construction of ancillary buildings to the north.

• All identified utility conflicts will be confirmed and relocated, as required. All assets within the Metrolinx layover site will • Proposed facilities are in close proximity to utilities (oil pipelines, need to be removed and relocated and/or locally lowered with gas main, hydro lines, telecommunication cables amongst a casing pipe across all tracks. Re-servicing of the site will be others). Utilities required. • Some of the proposed elements are in conflict with existing • Where new utility crossings are proposed, application for utilities. The potential impacts have been classified into three a new utility crossing agreement will be required. Where different categories: minor, medium or major. modifications to an existing utility crossing takes place, updates to an existing utility crossing will be needed. GO Expansion – New Track & Facilities TPAP

Effects and Proposed Mitigation Measures Continued Proposed Don Valley Layover Facility - City of Toronto

Type of Effect Description of Potenial Effects Proposed Mitigation Measure

• An Erosion and Sediment Control Plan will be prepared prior to, and implemented during, construction to minimize the risk of sedimentation. Earth • Excavation and backfill may be required to accommodate Management building footprints. • A Spill Prevention and Response Plan will be developed before work commences to ensure procedures and policies are in place during construction to minimize effects to wetlands and watercourses.