The Madison Fire Department responded to a business 949 East Washington Ave. for an “odor of gasoline” reported inside the building, according to a fire department report. Upon arrival, firefighters were advised that the smell appeared the day prior and was mitigated by a plumber, who used a ventilation fan to remove the odor. When people returned to the building Wednesday morning, however, the odor was back.
Engine Co. 1 and Ladder Co. 1 used air monitors to gather readings inside the building. There were no indications of oxygen displacement, but there was a strong smell like gasoline. A layer of petroleum product was observed on top of the water in the sump tank. Firefighters ordered an evacuation of the building, and the building was closed for the remainder of the day as agencies attempted to identify the origin of the fuel leak.
The Wisconsin Department of Natural Resources, Madison Water Utility (MWU), and Public Health Madison–Dane County were contacted and responded to the scene. MWU began investigating to determine potential areas of further contamination. Water samples taken from the sump tank showed visible petroleum product on the water’s surface. Firefighters walked the surrounding area to see if a source could be identified, but no obvious source was found.
The MFD’s Hazardous Incident Team (HIT) was consulted and also responded to the scene. The HIT collected additional samples from the sump basin, and test results indicated high confidence that the petroleum product was diesel. The MFD Fire Prevention Division provided additional information, based on building and tank inspection records, to help on-site officials explore whether any underground tanks located nearby may be a source of the leak.
