Dec 3 2025
Trolly 5 - 728, 17th Avenue SW
TAC Alberta (Calgary) Chapter: Holiday Mixer

You're Invited: TAC Calgary Holiday Mixer
 
Calling all tunnellers in the Calgary region! Join the TAC Calgary Chapter as we celebrate the end of 2025 with a laid-back evening of networking, drinks, and bites. Connect with fellow professionals and toast to the year’s achievements in a relaxed atmosphere.

When: Wednesday, December 3, 2025
Location: Trolly 5 - 728, 17th Avenue SW
Time: 4:00 p.m.

Registration Cost:
$10 – for TAC Members
$20 – for Non-members

Event Highlights:
- Networking & Entertainment - Connect with industry professionals in a lively environment!
- Short Technical Session - A 30-minute-long presentation will cover a timely topic in the industry. See details below!
- Food & Drink - Enjoy two drink tickets courtesy of TAC and a selection of delicious appetizers and refreshments.


Technical Session Details:
Title: "North America's Largest Diameter MTBM: The Northwest Inner City Calgary Upper Plateau Sewer Separation Project"
Learn how Calgary utilized a 3.4 m diameter MTBM to install 755 m of vital stormwater infrastructure beneath complex urban terrain. Innovative trenchless design minimized disruption while enhancing flood protection for the Sunnyside community


Confirmed Presenters:
- Craig Pass P.L. (Eng.), Senior Infrastructure Engineer / Project Manager, Associated Engineering
- Alex Eddie M.Sc., P.Eng., Geotechnical Engineer, Thurber Engineering

Abstract:
The Northwest Inner City (NWIC) Upper Plateau Sewer Separation Project is a multi-year project designed to alleviate flooding in the Sunnyside inner-city community in Calgary, Alberta. The project includes a large diameter storm trunk siphon to intercept stormwater from the upslope communities, bypassing Sunnyside and discharging directly to the Bow River. Trenchless construction was deemed necessary to minimize disturbance to the community and traverse the change in topography from the upper plateau to the lower elevation Bow River. The project was designed as a single ~755 m long, 3,400 mm inside diameter, tunnel drive between a launch shaft at the base of the upper plateau and a reception shaft adjacent to the Bow River. The tunnel alignment consisted of two distinct sections: a deep section through Paskapoo Formation bedrock that included a crossing of the Calgary CTrain red line and a horizontal curve; and a relatively shallow section (less than three tunnel diameters of cover) along 7 Street within Sunnyside initially through bedrock, but ultimately transitioning into the alluvial channel deposits. Construction started in November 2021, and installation of the storm trunk siphon was completed by microtunnelling at the end of 2022.

BIO – Craig Pass P.L. (Eng.)
Craig Pass, with Associated Engineering’s Calgary office has over 24 years of experience in linear infrastructure, facilities and water management, Craig provides technical expertise rooted in design, construction and trenchless experience. These skills are supplemented with leadership, communication and organizational skills to effectively lead projects through all phases and ultimately to successful conclusions. With experience in all phases of project delivery, Craig's direct role with the client and field staff leverages experience with operation and maintenance considerations to optimize design of infrastructure with long term functionality in mind. He is currently the treasurer for NW NASTT Chapter and has served on the board since 2022. For NWIC UPS project, Craig was involved in all stages from feasibility and pre-design to senior reviewer on detailed design, contract documents and technical specifications. During construction and post construction he provided technical support to field staff.

BIO - Alex Eddie M.Sc., P.Eng.
Alex Eddie has been working as a geotechnical engineer at Thurber since 2017, undertaking geotechnical investigations, reporting, construction monitoring and project management on a variety of geotechnical projects in Calgary and across Alberta and BC. Alex has a master's degree in tunnelling and underground space engineering from the University of Warwick and specializes in providing geotechnical support for trenchless installations. Prior to joining Thurber, Alex performed design coordination, temporary works design, and on-site support for the construction of soft ground tunnels and shafts on tunnel projects in London, England. Alex completed both phases of the geotechnical investigation for the Northwest Inner City (NWIC) Upper Plateau Sewer Separation Project and provided support during construction.