The pipeline stretches all the way from Alberta, to Washington (USA), crossing over British Columbia. It has tunnels at several places and  the report emphasizes that geologists remain concerned of the potential for active fault lines at the location of the Burnaby Mountain tunnel that is planned under Burnaby Mountain.

If you want to read a good summaryof the report:

A new investigative report titled “Trans Mountain Pipeline: The truth about construction” released today by international environmental organization Stand.earth reveals how the Canadian federal government faces bigger construction challenges than previously thought and calls into question the three-year construction timeline for the project.

http://www.netnewsledger.com/2019/09/13/trans-mountain-pipeline-faces-construction-challenges-opponents-say/

Or if you want to read the report itself:

https://www.stand.earth/sites/stand/files/Standearth-TransMountainPipelineConstructionReport-September2019-Final.pdf