UMATILLA -- The Umatilla Chemical Depot has incinerated a ton container of mustard gas, the first burning at the depot since October.
The burning Sunday was allowed after lower limits were set on how much organic salt can be in the containers undergoing incineration. The Oregon Department of Environmental Quality on Friday approved a draft permit for the trial burn.
URS, which operates the incineration plant, had been burning some containers with 600 to 700 pounds of salts before the testing phase of the program was halted in October. Some of the containers boiled over, leading to eight incidents when the plant exceeded its air quality emissions limit.