STP Operator (Unionized) Job Details | Aecon

Come Build Your Career at Aecon!

As a Canadian leader in infrastructure development, Aecon is safely and sustainably building what matters for future generations to thrive! We lead some of the most impactful infrastructure projects of our generation, at the forefront of transformational change in transportation and energy, and partnering every day to build, connect, power, and strengthen our communities.

At Aecon, you can count on:

• Safety Always. Our number one core value. If we cant do it safely, we dont do it at all.
• Integrity. We lead by example, with humility and courage.
• Accountability. Were passionate about delivering on our commitments.
• Inclusion. We provide equitable opportunities for everyone.

We lead the infrastructure industry with purpose, and our people are at the heart of everything we do. So, we invest in our people, just like they invest in us!

At Aecon we:

• Ensure you and your family receive the services needed to support your mental, emotional, and physical well-being.
• Believe in helping you build your career through our Aecon University and Leadership Programs.
• Are committed to supporting and investing in inclusive work environments, through initiatives like Equity, Diversity & Inclusion training, our Aecon Women in Trades and Aecon Diversity in Trades programs, and our Employee Resource Groups (ERGs) to ensure we are building inclusion into every aspect of our culture at Aecon.
• Are a leader in sustainable construction. With a strong commitment to operating responsibly by minimizing our impact on the environment and surrounding communities.

Our business success relies on strong execution and continuous improvement driven by the diversity, expertise and teamwork of our people. Were always searching the globe for innovative, collaborative minds to join our best-in-class Aecon community!

What is the Opportunity?

As part of an alliance agreement, Aecon has been awarded a contract in an Aecon-led partnership with Kiewit Nuclear Canada by Ontario Power Generation (OPG) for the execution phase on the Darlington New Nuclear Project (DNNP) in Clarington, Ontario. In 2025, Aecon began the Construction of the Unit 1 Small Modular Reactor at the Darlington site.

Job Summary

The STP Operator is responsible for operating and monitoring the Separation & Treatment Plant to efficiently separate solids, oil, and contaminants from wastewater generated during construction and tunnelling activities. The role ensures safe operation, environmental compliance, and continuous plant availability to support site operations.

Key Responsibilities Plant Operation

• Operate and monitor separation and treatment units including settling tanks, separators, hydrocyclones, clarifiers, oil-water separators, and chemical dosing systems.
• Control pumps, valves, mixers, and conveyors to maintain steady plant throughput.
• Adjust flow rates, pressures, and dosing to optimize separation efficiency.

Monitoring & Quality Control

• Monitor inlet and outlet water quality (pH, turbidity, suspended solids, oil content).
• Take routine samples and maintain operational logs.
• Ensure treated water meets discharge or reuse requirements.

Solids & Waste Handling

• Manage sludge, separated solids, and oil waste.
• Operate dewatering units and monitor cake quality.
• Coordinate waste disposal as per environmental regulations.

Health, Safety & Environment (HSE)

• Follow all site safety and environmental procedures.
• Handle chemicals safely using proper PPE.
• Prevent spills, overflows, and environmental incidents.

Reporting & Coordination

• Report daily operations, downtime, and issues to the Supervisor.
• Coordinate with TBM, slurry, dewatering, and site teams.
• Support inspections by the client or authorities.

Reason for vacancy: New

Pay Rage:

Per the HCAT Collective Agreement:

Effective May 1, 2025: $51,44/hr

Effective May 1, 2026: $52.80/hr

Effective May 1, 2026 $54.39/hr

We strongly encourage applicants who identify as Indigenous to apply to work with us on the Darlington New Nuclear Project. At Aecon, Indigenous is an umbrella term for First Nations (status and non-status), Metis and Inuit.

Aecon fosters diversity, inclusion and belonging within and across our organization. We welcome all to apply including, women, visible minorities, Indigenous peoples, persons with disabilities, and persons of any sexual orientation or gender identity.

We are committed to adhering to the objectives and requirements outlined in the Accessible Canada Act (ACA), and to meeting the accessibility needs of persons with disabilities in a timely manner. Through the implementation of the requirements of the ACA and its applicable regulations, appropriate accommodations will be provided upon request throughout the interview and hiring process.

As part of our commitment to fair and transparent hiring practices, Aecon may use artificial intelligence (AI) tools to assist in screening and reviewing candidates. These tools are applied responsibly and in accordance with applicable privacy laws and Aecons AI Usage Policy. All final decisions are made by qualified Aecon team members.