Crews are working just south of Freeman South Dakota.
The field turned into a large work site as crews work to figure out what happened. It all started when a neighbor called Loren Schultz and said there was a strange looking substance on his property.
"They thought it looked like oil so they called me. I went down there, looked at it and definitely thought it was oil so I called TransCanada and I say within an hour and a half they had a guy out here," Schultz said.
Crews have been working there ever since. Right now, around 100 people are on site. They are looking at the extent and the cause of the potential spill. Until they finish, the pipeline will stay closed.
"If we find out it's something with the pipe then we'll be looking at the type of repairs would take place. Understanding how that actually occurred as well so the work we're doing here, we're not back here later doing the same thing," spokesperson Shawn Howard said.
TransCanada spokesperson Shawn Howard says customers have already been informed that the pipeline will stay closed for at least a few days. Crews have taken the initial sample of the substance in question.
"We've sent that off to a lab for analysis and it's going to take a little time to do their kind of fingerprint of what exactly what it was," Howard said.
Howard says at this point, they don't know what it was and where it came from. As crews continue to work, Schultz isn't worried about his health, or the health of his livestock.
"I'm not too concerned about it. I'm sure they'll take care of it and clean up all the ground that's got oil in it," Schultz said.
If you have any questions, contact TransCanada at 800-661-3805.
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The entire Keystone Pipeline, which transports oil from Canada, is shut down after a potential leak in South Dakota.