When the ExxonMobil Pegasus pipeline split open in late March it spilled 210,000 gallons of oil into a small Arkansas town. The spill galvanized opponents of the Keystone XL Pipeline, who cited its planned path through major rivers and aquifers. Activists say TransCanada, which would build and operate the pipeline, underestimate the size of potential spills.
"I don't agree with people who say a spill into the aquifer will ruin the whole aquifer. It would ruin a very small piece, but it's important if that's your small piece," John Stansbury, a University of Nebraska professor of environmental and water resources engineering. "But if it got into a major river, it could create a plume hundreds of miles long."
Read more here .