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Allnorth was engaged by Graham Infrastructure LP – Calgary (Graham) for the design of  a standard aluminum stair ladder for four similar clarifier tanks at the Bonnybrook Wastewater Treatment Plant in Calgary, Alberta. 

Allnorth lead the structural and mechanical engineering design of this project. This involved designing a retractable stairway access and platform, as well as making modifications to the existing platform to accommodate the new stairs.

Our dedicated team of structural and mechanical engineers was responsible for preparing calculations, conducting analyses, creating comprehensive drawing packages, and maintaining communication with the vendor. Additionally, they were tasked with reviewing vendor and fabrication shop drawings as needed. 

To ensure the structural integrity of the stairs, our team provided construction support by conducting site visits during the construction phase.


  • Structural Engineering and Design
  • Mechanical Engineering and Design
  • Project Management
  • Construction Support


Calgary, AB

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With locations across Canada and into the US and Mexico, Allnorth prides itself on being responsive to client needs and to providing leading-edge methodologies, technologies and protocols. Having a local presence helps us build strong relationships, and working cross functionally throughout the company helps us leverage the strengths of our entire team to deliver successful client solutions. Contact us today for more information as to how we can work together for you.

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