ExxonMobil could restart the northern leg of its Pegasus oil pipeline within a year, but the company's pre-startup tests could leave behind threats large enough to endanger the public, according to a review of Exxon's proposal.
Those details and others are laid out in Exxon's repair plan for the Pegasus northern segment, a document that was submitted to federal pipeline regulators at the end of March. The so-called "integrity verification and remedial work plan" was not publicly released, but InsideClimate News obtained a copy through a public records request.
Exxon plans to conduct stress tests on the pipeline to prove that it can be safely restarted. But the company also said if high-pressure tests trigger a significant number of pipeline failures, it might lower the pressures—a downgrade that could leave dangerous cracks in the pipe. The Pegasus split apart in Mayflower, Ark. in March 2013, and sent a flood of Canadian diluted bitumen into a neighborhood.