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Wilde suspects one local source might be an herbicide, diquat dibromide, that is used to kill hydrilla.

He helped the agency impose controls on hazardous waste, restore and protect Chesapeake Bay in Maryland and Virginia and remove the pesticide ethylene dibromide, also known as EDB, from use on U.S. farms.

Officials say groundwater collected from monitoring wells at the site contains contaminants that are typically associated with fuel releases - such as ethylene dibromide and benzene.

The leaking fuel contained the additive ethylene dibromide, or EDB.

The contamination may date back to the 1960s, when the agency began spraying ethylene dibromide on trees to kill pine beetles.