Odor traced to a walnut processing facility near Orosi.
Leak dumped nearly 100 pounds of anhydrous ammonia.
Flames quickly brought under control by plant fire brigade.
Anhydrous ammonia presents a risk of explosion under the right circumstances.
Workers returned to their jobs less than 90 minutes after the first warning
Thirteen employees at a food processing plant were overcome by fumes
An abnormal transient hazard known as “hydraulic shock” poses a significant risk to industries that use anhydrous ammonia in bulk refrigeration operations, a safety bulletin by the U.S. Chemical Safety Board states.
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