I,m surprised why the plant, being that close to the town was not required to have blast burms installed around the perimeter like they often require around ammo dumps and fire works site.
Unfortunately these explosions will throw a lot of hot burning debris over any berm. After the Texas City explosion responders had trouble even entering the area because of the fires and debris thrown many miles around the epicenter.
Land is cheap there and a buffer zone should have been bought. Along with a plan that didn't expect 3 volunteer firefighters to show up to deal with that fire.