On February 20 2002, the State of Idaho notified and requested assistance of EPA to investigate a mercury spill in a residence in Meridian, Idaho. A mercury thermometer broke inside the home. The mercury fell onto the carpet. The wife is 7 months pregnant and there is a 3 year old child in the household. Given the potential exposure scenario, Idaho DEQ, Bureau of Hazardous Materials and Health District #4 requested EPA assistance to assess residual mercury vapor concentrations in the home with respect to ATSDR suggested action levels.