Fire damaged a warehouse near Gas Works Park on Saturday.
The fire call came in at 2:14 p.m. at a warehouse where a company called Modumetal is located.
"We were hanging out at the park here and watching the boats in the sun and we started seeing some smoke come up from the building behind us and before we knew it it was a big billow of smoke and it stunk," said witness Jon Allen.
No one was inside.
When firefighters entered, they found 20-foot flames.
A containment lab was inside the facility and firefighters saw several vats of substances. One of them was an acidic substance called nickel cobalt, used for metal plating.
Firefighters were pulled out for their safety and they knocked the fire down from the outside the building.
Investigators said the fire was caused by an electrical arc to industrial plating equipment. Damage was estimated at $150,000.
The big concern was whether any of the nickel cobalt got into Lake Union. The EPA and Coast Guard were notified. Investigators determined that there was no spill.