The Chemical Safety Board announced Tuesday it has completed testing on a key propane tank valve as part of its probe of an explosion at West Virginia convenience store that killed four people and injured six others, but that it is continuing to investigate other factors relating to the accident.The board’s announcement came on the first anniversary of the accident at the Little General Store in Ghent.Propane gas was released suddenly through a liquid withdrawal valve during a changeover between two propane tanks.A volunteer firefighter and an emergency medical technician who responded t...
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