Whiting Refinery

The Whiting Refinery is an oil refinery located on the southwestern shore of Lake Michigan and the Indiana Harbor Ship Canal and operated by BP. The facility is primarily located in Whiting, Indiana, USA, though portions of the complex span into the neighboring cities of Hammond and East Chicago.
The refinery was established in 1889 by Standard Oil of Indiana. It is the sixth largest refinery in the US and has a capacity of more than of crude oil.
Modernization project.
In 2012 BP undertook a $14B modernization project at Whiting to remove older, less efficient equipment and to install state-of-the-art pollution controls to emissions which will "reduce harmful air pollution that can cause respiratory problems such as asthma and are significant contributors to acid rain, smog and haze, by more than 4,000 tons per year." 
The new Gas Oil Hydrotreater and Coker with a reconfigured distillation unit. The new Pipestill 12 unit which was upgraded with a coker to handle the heavier Canadian crude oil was built to increase energy security in the Midwest by replacing lighter crude oil with heavier crudes.
Mechanical problems and shut down.
In August 2015 the most important unit of the Whiting refinery, capable of handling 240 thousand barrel per day and known as 12 pipe still , was shut down - reportedly due to holes found in piping, "disrupted markets throughout the region." The price of oil in Oklahoma fell and the price of gasoline in the USA Midwest increased. The price of Western Canadian Select, the heavy crude oil from western Canada refined at the Whiting refinery, fell to $20/bbl - its lowest price in nine years, causing the Canadian oil to be redirected into oil storage at the Oklahoma storage hub. An oil buildup at the Cushing hub is causing a spread between the price of the North American oil (known as the WTI) and the European price (known as Brent). That spread has averaged about $6 for 2015. During 2013 when the 12 Pipe Still unit was upgraded to handle the heavier Canadian crude oil, the WTI-Brent spread increased to over $20. As of August 2015 the Cushing oil hub is at 80% of its 71 million barrel capacity, rising at the rate of about 1 million barrels a week.
Emissions.
In 2001 as part of EPA's Petroleum Refinery Initiative BP consented to reduce emissions at all of its refineries. According to an internal fact sheet from BP, "[f]rom "2001 through 2008, the Whiting refinery reduced regulated air emissions 72%." However, BP North America did not fulfill all its obligations under the 2001 settlement agreement and committed new violations of the Clean Air Act at the Whiting refinery during the construction project, such as flaring devices. As a result, the Environmental Protection Agency (EPA) and the Department of Justice fined BP North America $8M and required the company to install innovative pollution controls similar to those in a 2012 EPA settlement with Ohio-based Marathon Petroleum Corporation in April 2012 which involved reducing flares and increasing combustion efficiencies.