The City has received recurring odour complaints from residents in the vicinity of the sewer, primarily at the intersection of Rhodes Avenue and Fairford Avenue, and on Rhodes Avenue between Gerrard Street East and Dundas Street East.
A vent stack located on Rhodes Avenue allows for the release of sewer gases into the air to prevent their build-up inside the sewer. The vent stack is equipped with a carbon filter, but this has been ineffective in reducing odour in the area.
In order to find a long-term solution for the control of odour from the sewer, the City has initiated a Municipal Class EA Study.
The initial phase of the Study included sampling Coxwell STS sewer gases, wastewater chemical analysis and ‘fan testing’. Findings of the field sampling and monitoring were then used to develop air flow models. Computer modelling was used to simulate the sewer and determine the most suitable odour treatment technology.
The City evaluated several different types of odour control technologies and selected a two-stage treatment system which includes a bioscrubber followed by a carbon filter as part of an odour control facility. This two-stage technology has a very high odour removal efficiency based on similar treatment systems used in other municipalities.
To site the new facility, the City identified and assessed a number of potential locations within the study area. Six feasible sites were selected for detailed evaluation. From the detailed evaluation, one site is being put forward as the recommended location for the new odour control facility.
The study area runs along Coxwell Avenue and Rhodes Avenue from Mortimer Avenue in the north to Dundas Street East in the south.
Public Consultation Drop-In Event #1 was held on Wednesday, September 25, 2019, at the Toronto Fire and EMS Training Centre (895 Eastern Avenue).
The City presented the recommended solution that will be considered to reduce the ongoing sewer odour issue along the Coxwell and Rhodes corridor.
The public was given an opportunity to speak one-on-one with project staff and provide feedback regarding the proposed odour control technology and site on Coxwell Avenue, south of the rail corridor.
The Coxwell Sanitary Trunk Sewer is located beneath Coxwell Avenue and Rhodes Avenue, carrying sewage to the Ashbridges Bay Wastewater Treatment Plant.
The City of Toronto has received sewer odour complaints from residents in the vicinity of the Coxwell STS, near the intersection of Rhodes Avenue and Fairford Avenue, and near the intersection of Rhodes Avenue and Dundas Street East.
This study will define the problem and opportunities, develop and evaluate alternative solutions, assess impacts of the preferred solution, and identify mitigation measures to lessen any adverse impacts.
The Class EA process provides members of the public and interested parties with opportunities to provide input at key stages of the study.
Notification of public events will be advertised in the local newspaper and notices mailed to residents and businesses within the study area.
Public consultation is an important part of this study. Please visit toronto.ca/coxwellsewer for more information and contact us if you want to be placed on our mailing list for updates.
Ontario’s Environmental Assessment (EA) program promotes good environmental planning by determining and managing the potential effects of a project prior to implementation.
The EA program ensures that public concerns are heard. EA balances economic, social, cultural and natural environmental needs so that projects benefit Ontario.
This study is being carried out according to the Municipal Class Environmental Assessment Master Plan process. This is an approved approach to satisfying requirements of the Environmental Assessment Act specifically tailored to municipal infrastructure. The process includes identifying the problem or opportunity to be addressed, developing and evaluating a range of alternative solutions, providing opportunities for public input and identifying a preferred solution.