Aecon Construction Group Inc and Kiewit Nuclear Canada Corp. carrying on business under the general partnership firm name Aecon - Environmental Compliance Approval (sewage)

La traduction française de cet avis n'est pas disponible. Nous nous excusons pour le dérangement.

Type d'acte: Environmental Compliance Approval (sewage)

Numéro du REO
025-1249
Numéro de référence du ministère
5203-DHXLT4
Type d'avis
Instrument
Loi
Environmental Protection Act, R.S.O. 1990
Affiché par
Ministry of the Environment, Conservation and Parks
Étape de l'avis
Décision
Décision publiée
Période de consultation
Du 6 novembre 2025 au 21 décembre 2025 (45 jours) Fermé
Dernière mise à jour

Cette consultation a eu lieu :

du 6 novembre 2025
au 21 décembre 2025

Résumé de la décision

A new Environmental Compliance Approval is granted to Aecon Kiewit Nuclear Partners for the collection, transmission, treatment and disposal of cooling water for a tunnel boring machine (TBM) and construction water at Darlington Nuclear Power Generation Station.

Détails de l'emplacement

Adresse du site

1 Holt Road South
(Immediately east of existing Darlington Nuclear Generating Station)
Bowmanville, ON
Canada

Carte de l'emplacement du site

L'épingle de localisation correspond à la zone approximative où a lieu l’activité environnementale.

Afficher cet emplacement sur une carte opens link in a new window

Promoteur(s)

Aecon Construction Group Inc and Kiewit Nuclear Canada Corp. carrying on business under the general partnership firm name Aecon
1 Holt Road South
Bowmanville, ON
L1C 3Z8
Canada

Détails de la décision

A new Environmental Compliance Approval is granted to granted to Aecon Kiewit Nuclear Partners for the collection, transmission, treatment and disposal of cooling water for a tunnel boring machine (TBM) and construction water management that includes a slurry treatment plant (STP) and water treatment plant (WTP) having a maximum discharge rate of 40 cubic metres/hour to the site ditch and ultimately to Lake Ontario, consisting of the following:

Slurry Treatment Plant (STP)

A separation plant with DN300 slurry inlet pipe, cyclone pumps, screen machines, screen underflow tanks, collecting and balancing tanks, together with interconnected piping, recirculating acceptable slurry back to the TBM and discharging slurry with unacceptable properties to the waste suspension tank and then to the centrifuge unit described below, and with dry solids transferred by conveyor and to be managed according to the Soil Management Plan:

  • a centrifuge unit with a 650 millimetres bowl centrifuge, flocculant dosing station (3.3 cubic metres/hour capacity), centrate water collection tank (10 cubic metres capacity) and transfer pump (30 cubic metres/hour capacity);
  • a storage tank system including a fresh suspension tank (150 cubic metres capacity), fresh water tank (250 cubic metres capacity) connected to the municipal supply, waste suspension tank (500 cubic metres capacity) discharging to the centrifuge unit, and centrate water tank (250 cubic metres capacity) with 152 millimetres outlet pipe, level sensors and controls;
  • a jobsite wastewater collection basin that is lined with reinforced shotcrete with level sensors and controls having a capacity of 235 cubic metres

Water Treatment Plant (WTP)

A water treatment plant with a treatment capacity of 40 cubic metres/hour, treating effluent from the STP and discharging treated effluent to the site ditch and ultimately to Lake Ontario, consisting of the following:

  • one feed pump having a maximum rated capacity of 40 cubic metres/hour;
  • one incoming buffer tank having a capacity of 6.5 ubic metres equipped with level control, automatic pH, turbidity and temperature monitoring;
  • one linear thickener with automatic flocculant dosing;
  • three proposed sand filter pressure vessels (2 active, 1 for cleaning/backwash with automatic cleaning system monitoring/controls);
  • three proposed granular activated carbon filters (2 active, 1 for cleaning/backwash with automatic cleaning system monitoring/controls);
  • one transfer pump having a maximum rated capacity of 40 cubic metres/hour;
  • one filter press to dewater the slurry

Commentaires reçus

Par l'entremise du registre

0

Par courriel

0

Par la poste

0
Consulter les commentaires soumis par l'entremise du registre

Effets de la consultation

No comments were received.

Documents justificatifs

Consulter les documents en personne

Certains documents justificatifs peuvent ne pas être accessibles en ligne. Si tel est le cas, vous pouvez demander à consulter les documents en personne.

Veuillez communiquer avec le bureau mentionné ci-dessous pour savoir si les documents sont accessibles.

Client Services and Permissions Branch
Address

135 St Clair Ave West
1st Floor
Toronto, ON
M4V 1P5
Canada

Office phone number
York Durham District Office
Address

230 Westney Road South
Floor 5
Ajax, ON
L1S 7J5
Canada

Office phone number

How to Appeal

Cet avis de décision peut être porté en appel. Vous avez jusqu’à 15 jours à partir du 24 février 2026 pour entamer le processus d’appel.

Veuillez lire les renseignements suivants attentivement pour en savoir plus sur le processus d’appel.

Comment interjeter appelClick 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:

  1. prepare your application
  2. provide notice to the minister
  3. 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:

  1. 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
  2. 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
  3. 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:

  1. 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?
  2. 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)

Autorité compétente
Neryed Ragbar
Manager (A) Priority Project Approvals

Environmental Permissions Branch
135 St Clair Avenue West
Floor 3
Toronto, ON
M4V 1P5
Canada

437-776-8348

Proponent(s)

Aecon Construction Group Inc and Kiewit Nuclear Canada Corp. carrying on business under the general partnership firm name Aecon
1 Holt Road South
Bowmanville, ON
L1C 3Z8
Canada


Organe d’appel

Registrar, Ontario Land Tribunal
655 Bay Street, Suite 1500
Toronto, Ontario
M5G 1E5
(416) 212-6349
(866) 448-2248
OLT.Registrar@ontario.ca

About the Ontario Land Tribunal


Inclure les éléments suivants:

Numéro du REO
025-1249
Numéro de référence du ministère
5203-DHXLT4

Il ne s'agit pas d'un avis juridique. Veuillez vous reporter à la Charte des droits environnementaux de 1993 pour connaître les exigences exactes prévues par la loi. Consultez un avocat si vous avez besoin d'aide avec le processus d'appel.

Communiquer avec nous

Contact

S'inscrire pour obtenir des avis

Nous vous enverrons des avis par courriel accompagnés de toute mise à jour liée à cette consultation. Vous pouvez modifier vos préférences relatives à l'avis en tout temps en allant à votre page de profil où se trouvent vos paramètres.

Suivre cet avis

Proposition initiale

Numéro du REO
025-1249
Numéro de référence du ministère
5203-DHXLT4
Type d'avis
Instrument
Loi
Environmental Protection Act, R.S.O. 1990
Affiché par
Ministry of the Environment, Conservation and Parks
Proposition affichée

Période de consultation

6 novembre 2025 - 21 décembre 2025 (45 days)

Détails de la proposition

This proposal is for a new Environmental Compliance Approval (ECA) for Aecon Kiewit Nuclear Partners to establish sewage works for the treatment and disposal of construction-related water for the operation of the tunnel boring machine (TBM) used for boring of the condenser cooling water (CCW) tunnels, at a maximum rate of 40 cubic meters per hour for Ontario Power Generation (OPG) Darlington New Nuclear Project (DNNP) in Clarington.

The DNNP will be constructed adjacent to the existing Darlington Nuclear Generating Station, which is approximately 5 kilometres from the nearest town. The tunnelling activities related to this water treatment plant are currently expected to run 24 hours a day, from Monday to Friday, with a potential for extension on Saturdays, for an estimated period of 12 months.

The proposed sewage works include a modular/self-contained water treatment plant (WTP) that discharges after treatment into the existing site stormwater management system, approved under ECA No. 3501-DCKHX5, or is recycled back to the TBM.

The ministry will impose effluent limits and/or monitoring requirements for effluent discharges from the facility.

Documents justificatifs

Consulter les documents en personne

Certains documents justificatifs peuvent ne pas être accessibles en ligne. Si tel est le cas, vous pouvez demander à consulter les documents en personne.

Veuillez communiquer avec le bureau mentionné ci-dessous pour savoir si les documents sont accessibles.

Client Services and Permissions Branch
Address

135 St Clair Ave West
1st Floor
Toronto, ON
M4V 1P5
Canada

Office phone number

Commentaire

La consultation est maintenant terminée.

Cette consultation a eu lieu 6 novembre 2025
au 21 décembre 2025

Communiquer avec nous

Contact