The City is planning to replace the aging watermains on Martin Grove Road from north of Rathburn to Lorraine Gardens. These watermains are over 75 years old, have a history of leaks and breaks, and need to be brought to a state of good repair. For the watermain segment that will cross Mimico Creek, the City has initiated a Municipal Class Environmental Assessment (EA) study that will follow the ‘Schedule B’ approach to evaluate alternative alignments and recommend one to cross below the creek.


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Next Steps

  • Receive community feedback
  • Issue Notice of Completion and 30-day public comment period on Project File Report
  • Complete, issue and award construction tender
  • Construction anticipated to start late Summer 2021 and completed by December 2021 with site restoration in Spring/Summer 2022

A Virtual Public Meeting was held on December 7, 2020, to share information about the options that are being considered for road safety improvements on Rathburn Road and Martin Grove Road and the options for realigning the watermain below Mimico Creek.

The Virtual Public Meeting included:

  • presentations on the reconstruction of the intersection of Martin Grove Road and Rathburn Road and the watermain replacement from Rathburn Road to Lorraine Gardens.
  • a Question & Answer period
Watermain Replacement along Martin Grove Road from south of Savalon Court to Lorraine Gardens
Watermain Replacement along Martin Grove Road from south of Savalon Court to Lorraine Gardens

Two existing watermains on Martin Grove Road from north of Rathburn Road to Lorraine Gardens are 75 and 88 years old and have a history of leaks or breaks:

  • 2010
  • 2011
  • 2015 (two events)
  • 2016 (two events)
  • 2018 (three events)
  • 2019 (two events)

A new replacement watermain is needed to continue serving the community and building in redundancy in the water supply network.

The new replacement watermain segment that will cross Mimico Creek requires a Municipal Class Environmental Assessment (EA) study to determine its alignment below the creek. The replacement watermain segments north of Mimico Creek to just south of Savalon Court and from just north of Rathburn Road to Lorraine Gardens will be constructed within the road right-of-way and do not require an EA study.

Environmental Assessment Study

The Municipal Class Environmental Assessment study is an approved planning process under the Ontario Environmental Assessment Act. The study to replace the watermain below Mimico Creek will follow the ‘Schedule B’ process which includes opportunity for public input.

Environmental Assessment Study process for Schedule B proejects
The Environmental Assessment study process for schedule B projects includes the following steps: identify problem and opportunity; research the natural, socio-cultural, economic and environmental conditions; identify alternate solution(s) and develop evaluation criteria; evaluate solutions and select the preferred solution; complete final report and 30-day review period. This study is currently at the step to evaluate solutions and select the preferred solution.

Evaluation

The following alternative solutions have been evaluated:

#2 Below Bridge & Inside ROW #3 West of Martin Grove Road/Bridge #4 East of Martin Grove Road/Bridge
Natural & Environmental Moderate Impact Greatest Impact Least Impact
Socio-Cultural Moderate Impact Least Impact Moderate Impact
Technical (Constructability, Alignment & Impacts) Highest RIsk High Risk Low Risk
Economic Highest Cost High Cost Lowest Cost
Summary Significant potential of equipment failure resulting in additional costs Affects the most trees and includes high risk of equipment failure resulting in additional costs Moderate tree and park access impacts. Construction method is capable of constructing this alignment

Preferred Solution

The City is recommending that the watermain be installed east of Martin Grove Road/Bridge (#4). This solution:

  • poses the fewest construction risks and impacts
  • has an alignment within the recommended use of a specialized drill
  • does not impact the bridge’s structure or maintenance
  • does not impact other underground utilities

This solution may require the removal of up to five trees (which will be replaced) and may require intermittent closures or detours around the worksite in Ravenscrest Park (details to be confirmed after study completion).