Washington River Protection Services has isolated the source of vapors that produced a variety of symptoms in numerous Hanford workers recently.

The Hanford contractor, says it found a cut in insulation protecting a pump, and some liquid in unused equipment.

The vapors had sickened at least 18 workers over a two-week period, prompting the investigation.  All the workers have been cleared to return to work.

The cut has been sealed, and the old equipment has been removed from the area and cordoned off.   The symptoms included sore throats, headaches, burning eyes, nosebleeds, some dizziness and accelerated heartrate.