HERMISTON - Umatilla Chemical Depot employees detected a trace amount of VX nerve agent vapor Wednesday afternoon inside a depot storage structure storing leaking munitions.

The crew was conducting routine daily monitoring operations with standard mobile air-monitoring equipment, according to a news release by the U.S. Army.

The igloo already has a passive filter system, preventing the chemical vapor from escaping to the outside atmosphere. However, an additional filter system was installed, and the crews are scheduled to take additional readings today, the release said.

Most of the weapons in the igloo have been stored there since 1984 and have previously leaked. They are over-packed in large containers for additional protection.

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