E.T. Seton Park Major Maintenance Project
Transcript of E.T. Seton Park Major Maintenance Project
E.T. Seton Park Major Maintenance Project
May 13, 2021
Presented by:Ashour Rehana, Manager of Capital & Special Projects, TRCADivya Sasi, Project Manager, TRCAMichael Brierley, Fluvial Processes Specialist, Palmer
With support from:Matthew Johnston, Associate Director, Erosion Risk Management, TRCAJen Paterson, Ecologist, PalmerRobin McKillop, Principal Fluvial Geomorphologist, Palmer
Class Environmental Assessment Public Information Centre #2
We respectfully acknowledge the landswe are situated on are TraditionalTerritories and Treaty Lands, in particularthose of the Mississaugas of the Credit,as well as the Anishinaabeg of theWilliams Treaty First Nations, the Huron-Wendat, the Haudenosaunee, and arenow home to many diverse First Nations,Inuit and Métis peoples.
As stewards of land and water resourceswithin the greater Toronto region theToronto and Region ConservationAuthority (TRCA) appreciates andrespects the history and diversity of theland and is grateful to have theopportunity to work and meet in thisterritory.
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Land Acknowledgement
• All attendees are muted• All questions are to be submitted in writing only in
the Question box• Your questions are only visible to the meeting
organizers• Questions can be submitted at any time during
the presentation or Q&A session• Questions will be answered during the Q&A
session at the end of the presentation• This presentation will be recorded to ensure it is
available to interested individuals who are not able to attend
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Housekeeping
TRCA & Erosion Risk Management Program (ERMP) Project Team Project Study Area Environmental Assessment (EA) Process Summary of Public Consultation Feedback Overview of Preferred Alternatives Summary of Impacts and Mitigation Next Steps Question & Answer Session
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Agenda
POLLS1. What is your interest in the
E.T. Seton Park Major Maintenance Project?
Local Resident/Trail & Park User
Government Agency/Municipal Staff Member
Community Group Member Indigenous Group Member Other
2. Were you able to attend PIC #1 or review materials from PIC #1?
Yes
No
Toronto and Region Conservation Authority
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TRCA & Erosion Risk Management Program (ERMP)
ERMP
•Identifies shoreline and valley land erosion hazards
•Monitors erosion hazards and erosion control structures
•Remediates erosion hazards through risk-based prioritization
TRCA
• Manages flood and erosion risk
• Protects public safety, infrastructure, property
• Funded by municipal partners
Before
After
Ashour Rehana, Manager, Capital & Special Projects
Divya Sasi, Project Manager
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Project Team
Robin McKillop, Principal Fluvial Geomorphologist
Michael Brierley, Fluvial Processes Specialist
Jen Paterson, Ecologist
Brian Greck, Sr. Water Resources Engineer
CONSULTANTS COLLABORATOR
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Project LocationOntario Science CentreE.T. Seton Park
Taylor Massey Creek
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Priority Areas
Undermined outfall near trail and sewer
Collapse of gabion protecting sewer
Collapse of gabion protecting trail
Collapse of gabion near parking lot
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Area 1
Area 2
Area 3
Environmental Assessment Process
Public Consultation
The EA process guarantees opportunities for public participation throughout the planning of the project.
Conservation Ontario’s Class Environmental Assessment for Remedial Flood and Erosion Control Projects
Objective: Identify the best solution to address erosion issues threatening trails, parkland, and sewer
infrastructure, within each Priority Area
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Erosion Risk Analysis
Concept Alternatives
Preferred Concept
Project Plan
ProjectApproval
2019 Fall 2020 Spring/Summer 2021
Summer/Fall 2021
Fall 2021
*Future project timelines are subject to change
Summary of Public Consultation Feedback
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GENERAL • Recognition of the wildlife corridor function of the valley for deer• Importance of coordination with Metrolinx Ontario Line Project
PRIORITY AREA 1 • Concern for use of embedded log/wood debris boulder revetment in area
prone to high water events• Concern for proximity of parking lot to eroding bank
PRIORITY AREA 2 • Support for Preferred Alternative and proposed pocket wetland feature
PRIORITY AREA 3 • Impacts to adjacent recreational uses (disc golf facilities, West Don Trail)
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Priority Area 1 – Adjacent to Parking Lot
Mountain bike trailConcept Alternatives:• Do Nothing• 1 – Vegetated Boulder Revetment and Benching of Inner Bank• 2 – Truncated Vegetated Boulder Revetment and Benching of Inner Bank• 3 - Localized Cut/Benching of Inner Bank and Vegetated Boulder Revetment
Priority Area 1 – Drone Footage
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Collapsed gabion basket erosion control structure
Pinch Point
South bank erosion
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Concept Alternative 3 – Localized Benching of Inner Bank and Vegetated Boulder Revetment (Preferred)
Vegetated boulder revetement with staggered embedded large wood
Increased channel width
Existing riparian area to remain
unchanged
Smooth channel shape
Grade control structure (e.g riffle,
armourstone rib)
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Widened Channel
Toe of revetment below channel bottom
Vegetation (willow stakes) add additional
roughness
Embedded large wood
Concept Alternative 3 – Localized Benching of Inner Bank and Vegetated Boulder Revetment (Preferred)
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Priority Area 2 – South of Trail Fork
Concept Alternatives:• Do Nothing• 1 - Vegetated Boulder Revetment and Benching• 2 - Up-Valley Meander Translation• 3 - Channel Realignment with Grade Controls
Priority Area 2 – Drone Footage
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flow
Collapsed and separated concrete drainage pipe
Collapsed gabion basket erosion control structure
Approx. sanitary sewer alignment
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Concept Alternative 3 – Channel Realignment with Grade Controls (Preferred)
Live stakes and/or brush layers
Increased separation between channel and
infrastructure
New bed habitat (riffle-pool-riffle)
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New and widened channel width
Regraded and vegetated inner bankRestored and
naturalized area with pocket wetland
New riffle and improved aquatic habitat
Concept Alternative 3 – Channel Realignment with Grade Controls (Preferred)
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Priority Area 3 – Adjacent to Archery Range
Concept Alternatives:• Do Nothing• 1 - Trail Realignment with Repositioning of Private Outfall• 2 - Trail Realignment with Repositioning Private Outfall and Channel Enhancement• 3 - Vegetated Boulder Revetment *Revised with grade controls
Priority Area 3 – Drone Footage
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Failed wood retaining wall
Start of failing gabion basket wall
Existing drainage pipe
flow
Eroding bank close to trail
flow
flow
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Concept Alternative 3 – Vegetated Boulder Revetment and Grade Control (Preferred)
Trail alignment to remain
Outfall to remain in same location
Removal of wood retaining wall
Vegetated boulder revetment and regrading
Regrading and widening of inner bank
Grade control structure downstream of sanitary crossing (e.g. riffle, armourstone rib)
Vegetated boulder revetment bank
protection
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Concept Alternative 3 – Vegetated Boulder Revetment and Grade Control (Preferred)
Boulder toe erosion protection (inhibits erosion of new outfall channel mouth)
Riparian habitat unchanged
Removal of failed gabion basket wall and replaced with boulder revetment
Widening of channel to remove pinch-point
New riparian plantings
Mitigation Measures• Construction Best Management
Practices will be used for noise, dust, vibration, spill control, sediment control and soil management
• Application of TRCA Erosion and Sediment Control Guidelines
• Environmental construction monitoring• Embedded large wood in bank
treatments to increase roughness and minimize downstream energy transfer
Effects• Potential noise, dust and vibration
impacts to adjacent properties during construction
• Potential spills during construction could affect soil and surface water quality
• Increase in channel width and inclusion of pocket wetland (Area 2) will have a positive effect (improved water quality and habitat diversity)
• Erosion mitigation will be constructed where existing infrastructure is at risk, or there is potential for downstream erosion effects
Analysis of Environmental Effects
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PHYSICAL ENVIRONMENT
NET EFFECTS • Nuisance effects from construction activities will be reduced to the extent possible
Mitigation Measures• All temporarily disturbed areas will be
restored and planted with native vegetation
• Proposed habitat restoration of 4,800 m2 (total for 3 Priority Areas)
• Guidelines to reduce risk to migratory birds will be followed
• Species at Risk surveys during detailed design and mitigation in consultation with Ministry of the Environment, Conservation and Parks
• Evaluation of harmful effect to fish habitat during detailed design, then mitigated (in-water timing windows)
Effects• Disturbance of wildlife habitat during
construction• Removal of woodland/forest• Removal of riparian vegetation• Approximate area of habitat removal is
1,900 m2 (total for 3 Priority Areas)• Potential removal of bat maternity roost
habitat• Potential negative impacts to fish
habitat during construction (due to in-water works)
• Potential impacts to Bank Swallow habitat (Area 2)
Analysis of Environmental Effects
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NATURAL ENVIRONMENT
NET EFFECTS • Re-established vegetation will comprise targeted native vegetation to contribute to heathier
ecosystem. Total net area of habitat enhancement/restoration for the project is ~ 2,900 m2.
Mitigation Measures• Appropriate public notification of
construction works and trail closure• Pedestrian barriers around work areas
and other safety measures to be implemented during construction to ensure public safety
• Coordination with City and Ontario Disc Sports Association to mitigate impacts to the disc golf course
• Stage 2 Archaeological Assessment to be conducted prior to construction
Effects• Temporary closure of trails will impact
accessibility within the parklands• Disruption to park users during
construction• Impacts to disc golf course• Potential to encounter buried cultural
resources (as per Stage 1 Assessment)
Analysis of Environmental Effects
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CULTURAL ENVIRONMENT
NET EFFECTS • Temporary and minimized impacts to access and enjoyment of recreation areas during
construction, including reduced risk to trail users.
Mitigation Measures• Preferred alternatives to be
implemented by those experienced in natural channel design
• Construction monitoring by fluvial geomorphologist and/or water resource engineer
Effects• Long-term improvements to creek bank
stability and reduction in bank erosion• Protection of at-risk infrastructure (e.g.
sanitary and stormwater infrastructure, trails)
• Maintenance requirements are reduced (Areas 2 and 3)
• Potential for improper design implementation
Analysis of Environmental Effects
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TECHNICAL/ENGINEERING ENVIRONMENT
NET EFFECTS • Positive effects on long term channel/bank erosion• Improved ability to maintain and protect infrastructure
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Next StepsErosion Risk
AnalysisConcept
AlternativesPreferred
AlternativeProject
PlanProject
Approval
2019 - 2020 Fall 2020 Spring/Summer 2021
Summer/Fall 2021
Fall 2021
Provide your comments on the
preferred alternatives and the net project
impacts
Provide your comments on the
Project Plan
Upcoming Public Participation Opportunities
Next Steps:• Incorporate public feedback from PIC #2 and refine the preferred alternative for
each Priority Area• Provide updated preferred alternatives• Publish the Project Plan for public review and comment
We want to hear from you!
• Please fill out the comment form and tell us your thoughts about each Priority Area by Sunday, May 30, 2021.
• Visit the project website (www.trca.ca/seton-park) to fill in the form.
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Comment Form
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QUESTION & ANSWER SESSION (10 minutes)Type in your questions in the Question box.
PROJECT TEAM SPECIALISTSo Ashour Rehana, Manager of Capital & Special Projects, TRCAo Matt Johnston, Associate Director, ERM, TRCAo Michael Brierley, Fluvial Processes Specialist, Palmero Jen Paterson, Ecologist, Palmero Robin McKillop, Principal Fluvial Geomorphologist, Palmer
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Stay Connected
Send us your comments through the Comment FormVisit our website: www.trca.ca/seton-park
Sign up for the Project Mailing List
Contact the Project Manager
Divya SasiEmail: [email protected]: 416-661-6600 ext. 6463