The Pittsburgh Post-Gazette reported on July 11, 2018, that “Columbia Gas Transmission has told federal pipeline regulators that a landslide was the apparent cause of the rupture and explosion of a new natural gas pipeline in Marshall County, W.Va., last month. The site of the break was at the bottom of a steep hill on Nixon Ridge, just south of Moundsville. …. Lindsey Fought, a spokesperson with TransCanada, said the company is continuing to cooperate with federal authorities in the investigation. She confirmed that the federal pipeline agency and TransCanada’s ‘internal findings point to land subsidence as the cause of the rupture.”
According to the US Geological Survey Web page, “Land subsidence is a gradual settling or sudden sinking of the Earth’s surface owing to subsurface movement of earth materials.”
TransCanada, owner of Columbia Gas Transmission, touted the pipeline, which just started operation in January 2018, as “best-in-class,” exactly what Dominion says the ACP will be.
Writing in Blue Virginia on July 11, 2018, Jon Sokolow reminds us of the stories in late May and early June about Precision Pipeline (builder for the MVP), which had more than 50 post-completion landslides along a 55-mile non-mountainous pipeline route in Wisconsin. That’s approximately one landslide per mile.
The Sokolow article continues, “The landslide risks at issue in the Dominion/Precision Pipeline lawsuit are terrifying because the Mountain Valley and Atlantic Coast Pipelines are proposed to be built through some of the steepest terrain in Virginia, with slopes as steep as 78% in places. This mountainous terrain is particularly susceptible to landslides when fill material generated by construction is deposited on slopes after the pipelines are buried.”
How many miles of steep slopes are there on the Atlantic Coast Pipeline route? How many on the Mountain Valley Pipeline route? How many potential landslides? How many potential explosions?