On August 17, 2004, EPA Region 7 responded to an oil spill in an unnamed tributary of Mill Creek in Olathe, Kansas. The spill was reported to the EPA by the Johnson County Environmental Division, who had received the call from the local emergency response network. The oil spill was of unknown origin and of unknown quantity. Federal On Scene Coordinators at the scene determined that the spill needed to be cleaned up in order that human health and the environment be protected. EPA mobilized our clean up contractor the following morning to remove the oil from the impacted stream. By mid-day on August the 18 the oil had been removed.