State Investigators Looking Into Eastman Explosions Last October Say Their Probe Is Complete, With The Likely Cause That Rocked Kingsport Being Identified. The Final Report From The Tennessee Department Of Environment And Conservation Determined Eastman Was Not At Fault And Could Not Have Prevented The Explosions. The Seven-Page Memo Blamed Blockage Of A 30 Year Old Valve As The Most Likely Cause. The Explosions Took Place In The Company’s Coal Gasification Plant.