UPDATE 4/9/2016
Shelby County Emergency Management Agency Director Jared Rowcliffe described in an email Wednesday afternoon that the driver connected the truck’s tank to the storage tank to offload, but the truck rolled. Instead of the hose breaking, causing an automatic shut-off, the fitting on the truck failed and the product was released. Fire Chief Troy Agney said the cause of the spill was due to “fractured plumbing” on the transport truck. The official release is stated to have been 19 tons (38,000 pounds).