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Regulators want to know the risks that flawed welding or shifting ground could pose for more breaks on the Keystone, which has spilled repeatedly since 2011.
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The Keystone is Washington County's biggest source of property taxes for schools and other local government, but the company didn't pay for 10 years
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Crews in north-central Kansas continue to remove oil from several miles of Mill Creek that are now blocked off from the rest of the creek. Contamination downstream is decreasing.
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Crews divert Kansas creek in the race to clean Keystone pipeline spill and prevent further pollutionA Michigan scientist warns that dilbit can seem to disappear, only to turn up later. This mystery may have to do with how the oil binds to other particles in water.
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Drone footage immediately following the spill showed the 588,000 gallons of oil turned Mill Creek black. Keystone pipeline owner TC Energy says the fly-zone is necessary for the "safety and security" of cleanup crews.
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The spill in Kansas is now the second-largest spill of tar sands crude on U.S. soil. And scientists say this stuff comes with major complications for containing and cleaning it.
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The workers are on site in Washington County to survey and clean the Keystone pipeline oil spill that moved about three miles downstream in Mill Creek.
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The Keystone Pipeline started leaking oil Wednesday night. Before it could be fully turned off, some 14,000 barrels had leaked.
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Canadian company TC Energy estimated that 14,000 barrels of oil spilled near the Kansas-Nebraska border.
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The impact of the Keystone XL's cancellation in Texas is more complicated than many headlines would have you believe.