The State of West Virginia now requires that propane technicians be trained, certified, and licensed. The Chemical Safety Board issued the recommendation following the CSB investigation of a propane explosion at the Little General Store in Ghent, WV, that occurred on Jan. 30, 2007. The blast killed four people and seriously injured five others. The CSB found that a junior propane service technician was preparing to transfer propane, unsupervised, from an old to a new tank located next to an outside wall of the store. The technician removed a safety plug from a malfunctioning liquid withdrawal valve, causing an uncontrollable release of propane, which entered the store through the restroom ventilation system.