"Faced with complaints about black clouds of dust swirling into two Chicago neighborhoods, state environmental regulators are cracking down on one of the companies piling up huge mounds of refinery waste on the Southeast Side."

"The Illinois Environmental Protection Agency accuses Beemsterboer Slag Corp. of violating air pollution limits during its handling of petroleum coke, overhauling its storage terminal along the Calumet River without the necessary permits and failing to file plans to reduce lung-damaging particulate matter from the waste piles.

Beemsterboer's site at 2900 E. 106th St. is one of three locations just south of the Chicago Skyway bridge where petroleum coke, also known as petcoke, is stored before the high-carbon, high-sulfur substance is shipped to buyers in other states and countries."

Michael Hawthorne reports for the Chicago Tribune October 30, 2013. [2]