Niagara Gazette — Co-chairman William Boeck said it is "unlikely" the IWCS is the perpetrator because "the ditch would most likely catch it."
He said the ditch is 15 feet deep, while the wells descend 20 feet. So the possibility exists, he added.
"This shows the Corps is making a determined effort to identify questions previous studies have raised and their interest in getting data to try to answer those questions," Boeck said. "They're doing loose ends."
Cutting off the pipeline access also eliminates another way contamination can spread off-site, if it is occurring, Boeck said.
"The evidence indicates it's not been much of a problem," he said. "But this prevents any possible problems in the future."