Meeting: Port Lands Flood Protection Project Overview David - - PowerPoint PPT Presentation

TRCA Board of Directors Meeting: Port Lands Flood Protection Project Overview

May 24, 2019

David Kusturin, Chief Project Officer, Waterfront Toronto Kenneth Dion, Project Director, Port Lands Integration, Waterfront Toronto

Overview

• Purpose of Presentation: Inform the Board for their future decision-making over next 4 years
• What is Waterfront Toronto
• What is the PLFP and TRCA’s Role in PLFP
• Project Background
• PLFP is 23 Projects in 1
• Environmental Management
• River Valley Design & Construction
• River Ecologies and Habitat
• Questions

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What is Waterfront Toronto?

Waterfront Toronto is working to revitalize the lands by Lake Ontario, transforming past industrial sites into thriving neighbourhoods that support economic vitality and enhance quality of life. Our mandate comes from the three orders of government; our resources come from both public and private sources. As we work on behalf of Torontonians, Ontarians, and all Canadians, every decision we make is guided by our vision of one vibrant waterfront that belongs to everyone.

Designated Waterfront Area

West Don Lands Port Lands East Bayfront Central Waterfront

Public accountability

Reducing urban sprawl Building sustainable communities Increasing affordable housing Creating parks & public spaces Expanding public transit Driving economic competitiveness

What is the Port Lands Flood Protection Project?

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Project Timeline and Process

Amalgamation of two approved Environmental Assessments (EAs)

Don Mouth Naturalization and Port Lands Flood Protection EA TRCA with Waterfront Toronto and the City of Toronto Objective: “Establish and sustain the form, features, and functions of a natural river mouth within the context of a revitalized City environment while providing flood protection up to the Regulatory Flood.” Lower Don Lands (LDL) Class EA Waterfront Toronto with the City of Toronto and Toronto Transit Company Used the DMNP EA as baseline to determine footprint for naturalization and developable lands​ Identified location and type of roads, bridges, servicing and transit infrastructure required in LDL area.

2005 2005-20 2015 2008 2008-20 2015

Due Diligence

Port Lands Flood Protection and Enabling Infrastructure Due Diligence Study: 2015-2016 Merged the results of two EAs into a single project Confirmed costs, constructability considerations and schedule Cherry Street Lakefilling received tri-government funding in October 2016 Tri-government funding for the remainder of the project announced in June 2017

Roles of TRCA

• Eligible Receipt – TRCA identified by Levels of Government in 2001
• DMNP EA - Lead and Co-Proponent with Waterfront Toronto, City of Toronto
• Floodplain Regulator – Construction permits
• Technical expertise - Water resource engineering, subsurface engineering / hydrogeology,

ecological restoration and EA project management

• Monitoring - Environmental, ecological and archaeological
• Potential future landowner/operator - components of the design
• Annual EA Compliance Reporting
• Project Support to Waterfront Toronto throughout the Project implementation

Project Background

Looking east during construction of the Keating Channel in 1914.

Industrial uses like the oil storage tanks seen in this photo in the 1920s have left a legacy of contamination in the Port Lands.

Regulatory Flood – Current Conditions

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200 400 600 800 1000 1200 1400 1600 1800

Flood Frequency (years) Flow Rate (m3/s)

Regulatory Flood – Future Conditions

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Flood Protection Design

Flood Remediation Design

23 Projects in 1

PLFP Coordination with Other Major Public Initiatives

What are we building?

Full Vision Plan

Funded Project Areas

Three Streets for the Port Lands

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Three Bridges for the Port Lands

Environmental Management

Historical Site Use

• Historical infilling
• Crude Oil/Petroleum

Refining and Storage

• Explosives and

Ammunition Manufacturing

• Metal Treatment and

Fabrication

• Concrete and Cement

Manufacturing

Images from http://www.blogto.com/city/2012/02/what_th e_port_lands_used_to_look_like/

Contaminant Extent

Peat Assessment

• former marshland of

the Don River has left a legacy of peat deposits Peat Contour Map

Assessing Risk

• No current environmental approval process in Ontario for a project of this nature
• Community-Based Risk Assessment allows us to:
• Identify and evaluate the risks to human health and the environment
• Develop effective measures to mitigate or remove those risks​
• Develop a comprehensive strategy for treating and reusing soil within the project area (1.5M

m3 to be excavated)

• Support the creation of the new landmasses

River Valley Design & Construction Overview

Cutoff Wall Installation

• Multiple construction methods available: secant pile wall, slurry wall
• Specifications will included performance requirements during installation and post installation
• Also provides constructability benefits: minimizes dewatering and permits drier excavation

Example Cross-Section

Six Steps to Construction

Step 1 – Shallow Excavation Step 2 – Cut-off Wall Installation Step 3 – Deep Excavation Step 4 – Install Underdrain and Horizontal Barriers Step 5 – Install Clean Grading and River Finishes Step 6 – Connecting to the Lake

Flood Protection Landform & Valley Wall Feature

River Ecologies and Habitat

Seasonal Water Fluctuations Influence on Plant Community Distribution

Plant Communities - Section

River Ecology: Plant Communities and Habitat

Questions