As part of the Expansion Project, Trans Mountain will construct an underground tunnel to connect Burnaby Terminal and Westridge Marine Terminal, avoiding impacts on residents and existing infrastructure. Trans Mountain’s contractor, Kiewit Ledcor TMEP Partnership (KLTP) will use a tunnel-boring machine to construct a 2.6-km tunnel through Burnaby Mountain.

Under a separate application, Trans Mountain received approval from the Canada Energy Regulator (CER) to relocate the existing 24-inch delivery pipeline between the two terminals from Burnaby streets to the Burnaby Mountain Tunnel and increase the diameter to 30 inches. Trans Mountain will also apply to the CER to decommission the existing 24-inch delivery pipeline at a future date.

The new tunnel, at more than four metres in diameter, will contain three 30-inch delivery pipelines to load vessels at Westridge. Construction of the tunnel will involve use of earth-moving equipment, drills and other motorized equipment.

This work will be completed under a Burnaby Mountain Tunnel Environmental Protection Plan.

Work Hours

Trans Mountain plans tunnel preparation and work on the tunnel portals to be conducted Monday to Friday from 7 a.m. to 8 p.m. When required, maintenance work may be performed on Saturdays from 9 a.m. to 8 p.m.

Once tunnel boring begins, construction will occur 24 hours per day, seven days per week. Tunnelling will be conducted in double shifts of 10 hours each, between 7 a.m. and 3 a.m. Between 3 a.m. and 7 a.m., cleaning and maintenance activities will be performed within the tunnel.

Managing Impacts

Noise

Trans Mountain has developed a Noise Management Plan in accordance with CER Condition 86. The plan includes mitigation measures according to federal and provincial guidelines and best practices. These measures include actions, such as enclosing noisy equipment and using baffles where and when feasible, to limit the transmission of noise beyond the construction site.

Existing sound levels have been established for the neighbourhoods surrounding the terminal sites. Construction sound levels will be monitored to verify selected controls are effective and if additional controls are needed.

Vibration Monitoring

In July 2020 prior to the start of tunnel boring, Trans Mountain began monitoring vibrations from four vibration monitors placed along the Burnaby Mountain Tunnel route. This data collection was required in order to establish a baseline of existing vibrations in these areas, which will be used as a comparison of vibration activity as tunneling progresses through Burnaby Mountain.

Ground vibration is measured in terms of Peak Particle Velocity (PPV) and refers to the movement within the ground of molecular particles and not surface movement.


Each of the four monitors collect readings every 60 seconds. The readings from the closest monitor to tunnel boring activity as it progresses along the route, along with the baseline collected for that monitor, are reported here each month.

Baseline data for Monitoring Location 1


July 2021 data for Monitoring Location 1


Data includes other surrounding possible sources of vibrations including nearby trains and work taking place at Westridge Marine Terminal during the day and at night. If the data collected shows an elevation in vibration levels, mitigation measures will be used to reduce these levels.

We have committed to the Canada Energy Regulator (CER) to share the vibration data we gather from tunnel boring construction with the public. Tunnel boring began on May 26, 2021 and will take approximately 10 months to complete. Each month, you can find an update here.

We have put in place a robust vibration management and monitoring program for the tunnel boring to meet a regulatory commitment. If you are interested in more information, please contact us at [email protected] or call us at 1.866.514.6700.

Light

Light mitigation will be implemented where work is in proximity to public roadways and/or residential areas. An example of light mitigation includes directed lighting.

Waste Management

Waste rock will be disposed of at an appropriate facility according to applicable regulations.

Air and Dust

Vehicles and equipment must observe air emissions management plans which limit idling and the types of fuels and equipment that can be used on-site. Water or an approved soil stabilizer will be applied, if necessary, to soil piles to prevent wind erosion and applied to disturbed areas if traffic and wind conditions result in excessive dust. The frequency of dust abatement measures will be increased during periods of high wind.