OTTAWA – An unknown substance discovered floating on the Fox River in Ottawa coming from a storm drain brought a Hazmat Team in for mitigation. On Wednesday afternoon the Ottawa Fire Department was called to the end of East Jefferson Street where a substance that had an odor similar to diesel appeared to be draining into the river. The MABAS 25 Hazmat Team installed a containment boom to control the spill. According to Fire Chief Brian Bressner, the boom will be in place for some time. The source of the liquid is being investigated.