EPA established initial air quality designations for most areas in the United States, including Indian country, for the 2008 primary and secondary NAAQS for ozone.

EPA modified the testing procedures approved for analysis and sampling under the CWA as originally proposed on September 23, 2010.

SIP Proposal: North Carolina/South Carolina (ozone 2002 base-year emissions inventory for the bi-state Charlotte nonattainment area).

SIP Proposal: Florida (supplemental infrastructure requirements).

SIP Approval: North Carolina/South Carolina (ozone 2002 base-year emissions inventory for the bi-state Charlotte nonattainment area).

United States v. Bayer CropScience Inc., No. 1:12-cv-10847-WGY (D. Mass. May 10, 2012). Settling CERCLA defendants responsible for violations at the Industri-Plex Superfund site in Woburn, Massachusetts, must pay $3,812,127 to the DOI's Natural Resource Damage Assessment and Restoration Fund and must pay $357,319 in U.S. assessment costs, $42,815 in NOAA assessment costs, and $37,739 in state assessment costs.

EPA proposed to extend the effective date of the "Water Quality Standards for the State of Florida's Lakes and Flowing Waters; Final Rule" until October 6, 2012, and seeks public comment on an extension to July 6, 2013.

EPA proposed to approve revisions to Oklahoma's hazardous waste management program under RCRA.

EPA gave final authorization to Oklahoma's hazardous waste management program under RCRA.

EPA finalized the 2012 critical use exemption from the phaseout of methyl bromide under the stratospheric ozone protection program.