TULSA - One of the two federal investigations into an October explosion at a Green Country rock quarry is has ended.
Firefighters first responded to a fire at Tulsa Asphalt on October 12th. The fire started heating seven tanks filled with different fuels and oils.
Just when firefighters appeared to have the fire under control, a pressure relief valve on a tank malfunctioned, causing the explosion.
Monday, OSHA reported a federal investigation into Becco Contractors found no violations, so they will receive no citation.
A spokesman with OSHA says a second investigation into Tulsa Asphalt is still open.
By law, federal investigations by OSHA can take up to six month to complete. This means investigators have until mid-April to complete the case looking at Tulsa Asphalt's involvement.
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