In the US,Marathon Petroleum Corp.has been storing petroleum coke in a 30-foot(9-meter),uncovered pit near its 139K-b/d Detroit refinery in Michigan for the past seven years.The company says the petcoke is normally kept in the pit for a maximum of four days before it is loaded onto trucks and shipped out.In 2017,the city passed an ordinance that requires the material be stored in a covered facility after residents complained about uncovered piles of petcoke being stored along the Detroit River.It was unclear what entity was storing petcoke at the River,but Marathon asserted diat all of its petcoke storage was at its refinery.
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