This consultation was open from:
November 18, 2025
to January 2, 2026
Decision summary
An ECA Notice was issued to Clean Harbors for the construction and operation of a contingency process water pond located on the north west side of the facility, adjacent to Cell 18.
Location details
Site address
4090 Telfer Road, R.R. #1
St. Clair,
ON
Canada
Site location map
The location pin reflects the approximate area where environmental activity is taking place.
View this location on a map opens link in a new windowProponent(s)
Clean Harbors Canada, Inc.
4090 Telfer Road, R.R. #1
St. Clair,
ON
N0N 1G0
Canada
Decision details
The ECA Notice allows Clean Harbors to construct a contingency process water pond located on the north west side of the facility, adjacent to Cell 18.
- This pond is to be constructed outside of the landfill footprint, on virgin land
- The pond will be constructed in two phases. Phase 1 will have a total storage capacity of 56,000 metres cubed and Phase 2 will allow the expanded pond to have a total storage capacity of 87,000 metres cubed
- The company will initially construct the pond as Phase 1, and then construct Phase 2 if determined to be operationally required
The pond is to be used as contingency pond and be limited to emergency overflow situations during extreme weather events that exceed the capacity of the previously existing Process Water Pond system, or as additional capacity storage of Process Water during extended incinerator maintenance shutdown events.
No negative environmental impacts are expected from the construction of this pond.
Effects of consultation
No comments were received.
Supporting materials
View materials in person
Some supporting materials may not be available online. If this is the case, you can request to view the materials in person.
Get in touch with the office listed below to find out if materials are available.
1094 London Road
Sarnia,
ON
N7S 1P1
Canada
40 St. Clair Avenue West
Floor 2
Toronto,
ON
M4V 1M2
Canada
How to Appeal
This instrument decision can be appealed. You have 15 days from September 21, 2026 to begin the appeal process.
Carefully review the information below to learn more about the appeal process.
How to appealClick to Expand Accordion
Start the process to appeal
If you’re an Ontario resident, you can start the process to appeal this instrument decision.
First, you’ll need to seek leave (i.e. get permission) from the relevant appellate body to appeal the decision.
If the appellate body grants leave, the appeal itself will follow.
Seek leave to appeal
To seek leave to appeal, you need to do these three things:
- prepare your application
- provide notice to the minister
- mail your application to three parties
1. Prepare your application
You’ll need to prepare an application. You may wish to include the following things in your application:
- A document that includes:
- your name, phone number, fax number (if any), and/or email address
- the ERO number and ministry reference number (located on this page)
- a statement about whether you are a resident in Ontario
- your interest in the decision, and any facts you want taken into account in deciding whether you have an interest in the decision
- the parts of the instrument that you’re challenging
- whether the decision could result in significant harm to the environment
- the reason(s) why you believe that no reasonable person – having regard to the relevant law and to any government policies developed to guide decisions of that kind – could have made the decision
- the grounds (facts) you’ll be using to appeal
- the outcome you’d like to see
- A copy of the instrument (approval, permit, order) that you you are seeking leave to appeal. You’ll find this in the decision notice on the Environmental Registry
- Copies of all supporting documents, facts and evidence that you’ll be using to appeal
What is considered
The appeal body will consider the following two questions in deciding whether to grant you leave to appeal:
- is there is good reason to believe that no reasonable person, with respect to the relevant law and to any government policies developed to guide decisions of that kind, could have made the decision?
- could the decision you wish to appeal result in significant harm to the environment?
2. Provide your notice
You’ll need to provide notice to the Minister of the Environment, Conservation and Parks that you’re seeking leave to appeal.
In your notice, please include a brief description of the:
- decision that you wish to appeal
- grounds for granting leave to appeal
You can provide notice by email at minister.mecp@ontario.ca or by mail at:
College Park 5th Floor, 777 Bay St.
Toronto, ON
M7A 2J3
3. Mail your application
You’ll need to mail your application that you prepared in step #1 to each of these three parties:
- appellate body
- issuing authority (the ministry official who issued the instrument)
- proponent (the company or individual to whom the instrument was issued)
Clean Harbors Canada, Inc.
4090 Telfer Road, R.R. #1
St. Clair,
ON
N0N 1G0
Canada
Registrar, Ontario Land Tribunal
655 Bay Street, Suite 1500
Toronto, Ontario
M5G 1E5
(416) 212-6349
(866) 448-2248
OLT.Registrar@ontario.ca
Include the following:
This is not legal advice. Please refer to the Environmental Bill of Rights for exact legal requirements. Consult a lawyer if you need help with the appeal process.
Connect with us
Contact
Client Services and Permissions Branch
40 St. Clair Avenue West
Floor 2
Toronto,
ON
M4V 1M2
Canada
Original proposal
Proposal details
Clean Harbors operates an integrated hazardous waste management facility located on Lot 9 and part of Lot 8 in the Township of St. Clair. A key operational factor at the site is the appropriate management and collection of surface water at the site. One approach to managing surface water is to collect and manage water that falls onto processing areas into process water storage ponds. Currently, Clean Harbors has five existing process ponds around the site to manage process water. Due to operational needs, an additional pond is required for future weather events.
Clean Harbors is proposing to construct a contingency process water pond located on the north west side of the facility, adjacent to Cell 18. The proposed pond would be constructed outside of the landfill footprint, on virgin land.
The pond will be constructed of compacted clay. The pond walls will have a top elevation of approximately 207.3 metres above sea level and the pond base will be at 202.0 metres above sea level. The company is proposing to construct the pond in two phases. The pond constructed in phase one would have a total storage capacity of 56,000 cubic metres. The addition of the phase one pond will double the current storage capacity for process water at the facility. In phase two the pond would be expanded to have a total storage capacity of 87,000 cubic metres.
The new Process Pond will be an as-built pond as per the other process water ponds. The general layout of the pond and typical cross section of the ponds is provided in the supplemental information. The company would construct the pond as per phase one, and then construct phase two if determined to be operationally required.
Supporting materials
View materials in person
Some supporting materials may not be available online. If this is the case, you can request to view the materials in person.
Get in touch with the office listed below to find out if materials are available.
40 St. Clair Avenue West
Floor 2
Toronto,
ON
M4V 1M2
Canada
Comment
Commenting is now closed.
This consultation was open from November 18, 2025
to January 2, 2026
Connect with us
Contact
Client Services and Permissions Branch
40 St. Clair Avenue West
Floor 2
Toronto,
ON
M4V 1M2
Canada
Comments received
Through the registry
0By email
0By mail
0