BlueFox Engineering

Introduction

BlueFox Engineering was retained to provide preliminary engineering, investigations, detailed trenchless design, procurement of a drilling contractor and to provide on-site construction management, inspection and construction engineering services in order to install a raw water intake pipeline in the Hamlet of Joussard, Alberta, as part of a multi-year water treatment plant upgrade in the area.

Following site specific investigations and constructability considerations, horizontal directional drilling (HDD) was selected as the most suitable method. The designed drilled path would enter at a nearby boat launch on the shoreline and exit about 480m into the waters of Lesser Slave Lake.

Pipe stress analysis was performed as part of detailed design on the 273mm (10”) diameter HDPE product pipeline and required use of a buoyancy control program during product pullback. The final borehole diameter was reamed to 457mm (18”) diameter.

The project was designed for execution under complete winter conditions, when lake ice had sufficiently formed to support construction equipment travel. Access from the HDD entry point to the reception point would be entirely on ice.

Solution

As part of our scope of work, a significant component was dedicated to trenchless feasibility and minimal environmental impact to the water body and shoreline in preservation of the holiday town.

Subsurface investigations encountered varying stiffness medium and high plasticity clays and clay till, overlying some sand. These conditions were deemed suitable for jetting assembly drilling.

Conclusion

The HDD exit point was designed to be within a cutout in the ice, and the final water intake structure was installed by divers following pipeline pullback to lakebed.

 
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Raw Water Intake

Introduction

Solution

Conclusion

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