PORTLAND, Ore. – A dispatch supervisor did not know how to use the reverse 9-1-1 system to warn people of a toxic cloud released over parts of Portland and Milwaukie last week, according to a report issued from the Portland Office of Emergency Management Wednesday.On Wednesday, May 11, a power outage caused an air-scrubbing system to fail within Precision Castparts at 5001 S.E. Johnson Creek Boulevard. The toxic gas created by titanium reacting in a vat of nitric and hydrofluoric acid built up in the plant and began leaking outside.Emergency officials instructed residents within a half-mile of Precision Castparts to “shelter in place” until the air cleared. A reverse 9-1-1 call was supposed to warn residents of the incident, but it never went out.A city analysis found the Portland Bureau of Emergency Communications’ dispatch supervisor was not aware of the city’s new FirstCall system which was activated in December 2010; instead, the supervisor tried to activate another system that was no longer used.The report also noted the location of the incident complicated the situation because it borders two counties. That resulted in a lack of communication between the multiple agencies that were involved. Additionally, there were no clear written protocols for activating the system.The report says the written instructions have been updated to clarify the chain of command for activating the system. The city also says it will change its training procedures.Two firefighters and two employees of Precision were taken to the hospital to be treated for respiratory problems during the incident. But there were no other reported injuries. The shelter in place order was lifted the next day.The company makes cast metal parts for use in the aerospace, industrial, defense and automobile industries and is one of Oregon’s largest businesses.