Keeyask Infrastructure Project

Location: Keeyask Generating Station, Manitoba

Description: Construction of 23 km of access road, Site Development, Bridge Construction

Value: $36,000,000

Completion Date: November 2014

Owner: Manitoba Hydro, Re: Brian Beyak

Project Description

The Keeyask Infrastructure Projet is located in Northern Manitoba, accessible by road along Provincial Road 280, approximately 212 km from Thompson. Found in the Canadian Shield the terrain is hilly and rugged with the Keeyask Infrastructure Project being located along more of the lowland topography areas containing muskeg.

Amisk Construction, a joint venture between the Cree Nation Partners, (Tataskweyak Cree Nation and War Lake First Nation) and Sigusson Northern Ltd. was responsable for constructing all aspects of the Keeyask Infrastructure Project. The Keeyask Infrastructure Project contaned construction of the North Access Road, Main Camp and work areas, Looking Back Creek, bridge and the initial Start Up Camp.

The North Access Road inculded construction of 23.5 km of all season access road connecting Provincial Road 280 to the future site of the Keeyask Generating Station. The work included over 1,000,000 m3 of composite excavation, supply, hauling and placement of 450,000 tonne of aggregate material, geotextile installation, culvert installation and environmetal measures. Challenges encountered on the North Access Road included permafrost laden soils, high water table, environmental protection requirements, and permitting to access granular sources.

The work on the Start Up Camp required approximately 65,000 m3 of composite excavation and the supply and placement of all aggregates, grading and trimming to construct a pad area for the camp and support services.

Underground servicing for the camp included gravity sewer, forcemain, and water mains have been installed. The largest drain eld in Manitoba was installed to provide on site wastewater treatment and a sewage lift station was installed to pump the camp’s sewage to the lift station.

The work area development portion of the work included the supply and installation of a 2,975 m wastewater sewer system that included 28 manholes. In addition 7,760 m of pre-insulated water main piping, 7 hydrants, 35 valves and 700 m of forcemain were supplied and installed. In order to install the sewer and water lines, approximately 710 m of trench rock had to be drilled and blasted. This took place over 25 controlled blasts.

Services installed included 815 m of water and sewer piping complete with curbstops and heat trace. In addition approximately 6,085 m of pre-insulated, heat traced raw water line was installed along with 14 valves. A lift station was also constructed that come equipped with a truck dump area and a drain chamber.

Before the laydown area could be constructed roughly 190,000 m3 of composite excavation was removed and placed on the roads and padding. Once the area was cleared approximately 78,000 tonnes of granular subbase and 48,500 tonnes of gravel were hauled, placed and compacted to nish the work area.

The Main Camp construction entailed constructing the laydown pad for a temporary camp when completed, the temporary camp included a 2000 room dorm in addition to a gymnasium, recreation centre, water treatment facilities and the kitchen and dining areas.

Amisk was responsible for the supply and installation of approximately 2,500 meters of Storm Water Piping complete with catch basins, lawn basins, and outfall structure. In preparation for the installation of a Storm Water Piping system two blasts were completed on site to clear a trench.

To begin the laydown pad, roughly 208,000 m3 of organic soils was striped and moved in preparation for building the pad. To protect the permafrost from melting, all stripping had to be completed during the winter while the ground was frozen. Once the stripping was completed approximately 202,000 tonnes of granular subbase gravel and 70,000 tonnes of granular base were hauled and placed. BC bridge has a single clear span of approximately 30 m supported at each end by concrete abutments cast on steel piles which were driven to refusal.

Initial work at LBC commenced in the winter months with the only access to site being a winter trail. Road access was available along the North Access Road after it’s completion in April of 2012. Spring thaw occurred in May 2012 causing creek levels to rise drastically. Sigfusson Northern was able to showcase their expertise in problem solving when high water levels and unfavorable soil conditions impacted the structural excavation. The crews persevered through strenuous conditions and completed the project successfully.