BlueFox Engineering

Project Overview

‍As part of regional upgrades for flood mitigation, the Town of Wainwright and surrounding areas completed significant upgrades to their storm sewer, including the addition of new pipelines for added capacity to convey stormwater during a 1:100 year flood event. The proposed storm sewer alignment required crossing the Canadian National Railway, overhead power lines, and 4th Avenue. Due to the multiple surface obstacles and depth of installation required, a trenchless crossing solution was selected. BlueFox Engineering was retained to complete the detailed design and construction support.

Subsurface Investigation

‍The subsurface investigations encountered primarily clayey glacial till soils with significant sand deposits, including cobbles and boulders throughout the stratigraphy. Ultimately, cased auger boring was selected as the most suitable installation method. In order to mitigate the high-water table at this location, ongoing dewatering measures were implemented throughout construction.

Installation Method and Conduit Design

‍The Auger Bore crossing alignment was designed with a 1200mm steel casing for the 900mm SDR-35 PVC product pipe. The product pipe was centralized and spaced within the casing post-augering. The crossing was 10m deep, 133.5m long with a grade of 0.10%. BlueFox Engineering completed the trenchless design with plan and profile details for the trenchless section and developed performance criteria for augering, casing material, launch/reception pits, and settlement monitoring.

Completion

‍The product pipeline was successfully installed during the winter of 2017.

 
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Wainwright Gravity Storm Sewer

Project Overview

Subsurface Investigation

Installation Method and Conduit Design

Completion

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