NRC #910935 POLYCHEME DIMETHYLAMINE Atmospheric release. Port Bienville Industrial Park (Hancock Co., MS) OSC Ullock accompanied MS DEQ to the POLYCHEME Facility located in Port Bienville, MS (Hancock Co). The chemical manufacturing facility produces polymers for the water treatment industry. During a routine railcar transfer operation, a discharge hose failed (1.5 " slit) due to unknown causes resulting in the reported, 5 minute release (908 lbs.)of DIMETHYLAMINE into the atmosphere. Dimethylamine is a very toxic, flammable liquified gas. No injuries were reported.Response complete.