Imagine this soaking into the US High Plains' biggest aquifer along the Keystone XL route:
Exxon's Pegasus pipeline, which can carry more than 90,000 barrels per day (bpd) of crude from Pakota, Illinois to Nederland, Texas, was shut after the leak was discovered late Friday afternoon in a subdivision near the town of Mayflower. The leak forced the evacuation of 22 homes.
Exxon also had no specific estimate of how much crude oil had spilled, but the company said 12,000 barrels of oil and water had been recovered - up from 4,500 barrels on Saturday. The company did not say how much of the total was oil and how much was water....
The pipeline was carrying Canadian Wabasca Heavy crude at the time of the leak. An oil spill of more than 1,000 barrels into a Wisconsin field from an Enbridge pipeline last summer kept that line shuttered for around 11 days.