Man exposed to mustard agent at Umatilla chemical depot Posted: Mar 31, 2010 5:48 PM Updated: Mar 31, 2010 5:53 PM Video Gallery Man exposed to mustard agent at Umatilla chemical depot 0:57 KENNEWICK; Wash-- SNIPPET: "The depot is still waiting to hear back from independent lab results but early indications from the CDC are positive. About two weeks ago, a worker developed a blister on his skin, which is one of the symptoms." SNIPPET: "The man's name has not been released. He also hasn't missed any work as a result of the exposure."