Imperial Oil Ltd. says it is still investigating the cause and impact of a pipeline spill in the Northwest Territories that has some residents downstream concerned about the potential impact.
The Calgary-based oil and gas company reported on July 27 that it discovered about 55,000 litres of produced water had spilled before it shut down the pipeline in Norman Wells, N.W.T.
Produced water is treated water that is pumped back to the surface during oil recovery and reused in operations, the company said. Transport Canada says the byproduct of oil and gas extraction is generally high in saline and can be contaminated with other substances….