The bank of Mill Creak in Washington County, Kansas, following a rupture of the Keystone Pipeline on Wednesday, Dec. 7, 2022, in this handout published Dec. 9 by the U.S. Environmental Protection Agency. - U.S. EPA(WASHINGTON COUNTY, Kan.) Federal and state environmental officials worked over the weekend to mitigate the fallout from last Wednesday's Keystone Pipeline rupture that leaked about 14,000 barrels of crude oil into a Kansas creek. Officials hadn't yet determined the cause of the incident, TC Energy, the Canadian pipeline operator, said Monday afternoon. The spill near Mill Creek, in Washington County, Kansas, had been "contained" by about 250 people working at the site, TC Energy said in a statement. TC Energy officials met with the Washington Board of County Commissioners on Monday morning to brief the panel on the cleanup, officials said. "Repair planning is underway. Air quality monitoring continues at this time (and) there is no indication of ad