Tension Crack Upstream from Site C
Tension crack visible on north bank – image courtesy BC Hydro
Fort St. John, B.C.- Geo-technical engineers are monitoring and assessing a 400 meter long tension crack on the north bank of the Peace River , upstream from the Site C project.B.C. Hydro and Site C spokesperson, Dave Conway says the crack was first spotted on February 19th during excavation work to develop a haul road. “This area is just upstream from where the dam location is on the north bank, which is the Fort St. John side. It’s upstream from the dam, so the reservoir a little bit, towards a ravine that is called locally ‘garbage creek’.”
Conway says although 400 meters long, “It’s a relatively small area. The area we are talking about, the north bank, slopes, this ( tension crack) is not a surprise . We know the slopes are prone to stress fractures this was identified when we went through the environmental assessment process and also identified in our construction schedule.”
The plan , says Conway has always been to address tension cracks “Our overall work on the northbank is to remove these materials, to stabilize the north bank slope to an angle that will guarantee no impact and won’t affect the safety of the dam.”
Since it was part of the scheduled work, he is not able to say if this particular situation will have an impact on the overall cost of the project. “The crack has not grown, the soils are stable and we have geo-techs on site who are investigating, and we are presently determining what the plan is for the continuation of work on this area.”
The 30 workers who had been working on the development of the haul road, have been reassigned to other work.
Conway says work continues at the rest of the site.