SIP Approval: California (volatile organic compounds (VOCs) for the Northern Sierra and Sacramento metropolitan air quality management districts) 

EPA proposed new source performance standards for emissions of carbon dioxide from new fossil fuel-fired electric utility-generating units.

SIP Proposal: New Mexico (PSD revisions and eight-hour ozone and fine PM NAAQS)

SIP Approval: Delaware (volatile organic compounds)

United States v. Marathon Petroleum Co. LP, No. 2:12-cv-11544-DML-MJH (E.D. Mich. Apr. 5, 2012). A settling CAA, CERCLA, and EPCRA defendant responsible for violations at petroleum refineries in Illinois, Kentucky, Louisiana, Michigan, Ohio, and Texas must pay a $460,000 civil penalty, must implement flare minimization and efficiency plans, and must perform a mitigation project at its Detroit refinery at an estimated cost of $2.2 million.

United States v. NuStar Terminals Services, Inc., No. 1:12-cv-10585-DJC (D. Mass. Apr. 2, 2012). Settling Massachusetts General Law defendants responsible for contamination from leakage of liquid aviation fuel must pay $21 million, plus interest, in U.S. response costs incurred at the Massachusetts Military Reservation on Cape Cod.

EPA Region 6 announced the availability of 32 TMDLs for waters listed in Louisiana under CWA §303(d).

The U.S. Forest Service adopted a new land management planning rule that guides the development, amendment, and revision of land management plans for all units of the National Forest System.

EPA entered into a proposed administrative settlement under CERCLA that requires the settling party to pay $25,000 in U.S. response costs incurred at the Hassan Barrel Superfund site in Fort Wayne, Indiana.

SIP Proposal: Utah (maintenance plan for Davis and Salt Lake Counties).