Implementation of improvements to emission source control at fuel storage tanks is part of the settlement reached with USEPA over violations of the US federal Clean Air Act (CAA). In particular, the company must install and maintain a geodesic dome on one of the hydrocarbon fuel storage tanks at its Lemont refinery, as well as carbon adsorption systems on two hydrocarbon fuel storage tanks at its Lake Charles refinery. These projects are tasked with reducing emissions of volatile organic compounds (VOCs), including toxics, by more than 100 tons over the next five years.
NB: a complaint filed (by USEPA) at the same time alleges the company’s Lake Charles refinery produced fuel that exceeded the refinery’s annual average emissions limit for mobile source air toxics, including benzene. A further allegation is the company failed to sample and test reformulated gasoline blendstock at its Lemont refinery, as required by the CAA.
Here is the USEPA press release on the matter.