OREANDA-NEWS. June 06, 2014. Marathon Petroleum Corporation's (NYSE: MPC) Garyville refinery was impacted by a tornado. As a result of this severe weather, the refinery experienced damage to a cooling water system that serves part of the refinery causing the No. 1 crude unit and other units to be taken off-line.

Based on MPC's initial assessment of the damage and necessary repairs, the crude unit is anticipated to be operational by mid-June. The company does not expect total refinery throughputs to be significantly impacted, projecting less than a 5 percent reduction to the company's prior throughput guidance for this quarter.

"The exceptional response of Garyville's employees and contractors, along with the support of the local and state emergency responders, is greatly appreciated," stated President and CEO Gary R. Heminger. "The workforce is to be commended for their outstanding efforts during the initial response phase."