Abstract: At 5:50 p.m. on June 12, 2018, two employees were removing excess water from underground concrete vault which contained a metal gasoline storage tank for an automobile gasoline station. Employee #1 was using a shop vacuum inside the vault that was not approved for a flammable vapor environment. Employee #2 was on the surface of the parking lot near the manhole entrance of the vault. Gasoline vapors were ignited which caused a large explosion and a fire plume. Employee #1 was entrapped inside the concrete vault and killed from the blast and fire. Employee #2 sustained severe burns to the body and was transported to a hospital.