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Johnson 281S Site Prep and Foundations

Project Details

Year Completed: 2014
Location: Didsbury, AB

The Johnson 281S Substation is a new 240-kV/138-kV switching station located west of Didsbury. This substation required 1.5 km of transmission line to connect it to an existing line.

The site preparation and grading work included building a 104 m x 128 m substation pad and two access roads off the existing TWP 314 road. The work required topsoil stripping, placing 300 mm of pit run, and laying 200 mm of road crush. Once the site was prepared, a transformer pad with oil containment system and 4 circuit breaker pads were constructed. Finally, the project required the installation of a substation fence and reclamation.


Our Role

CAP was awarded the entire civil scope for the project and procured all material for the work. CAP’s project management team oversaw our direct construction team and subcontractors. During the construction process, CAP was the main point of client contact. We submitted RFIs to address construction issues, provided daily and weekly progress reports, and attended daily progress meetings on site.

Through field engineering, thorough planning, and proactive measures, CAP overcame multiple obstacles during construction. This included saturated subgrade conditions, constructing in winter conditions, and building a pad that exceeded compaction requirements on every layer.