EPA seeks public comment on its plan for periodic retrospective review of regulations as called for by Executive Order No. 13563, Improving Regulation and Regulatory Review.

EPA proposed a supplemental federal implementation plan for the Four Corners power plant on the Navajo Nation in New Mexico to reduce visibility-impairing pollution.

EPA proposed to restrict the states' use of emission reduction credits from outside a nonattainment area to meet the 1997 eight-hour ozone NAAQS.

EPA delegated authority to Iowa, Kansas, Missouri, and Nebraska to implement and enforce NESHAPs and new source performance and maximum achievable control technology standards.

United States v. City of Wyandotte, No. 2-11-cv-12181 (E.D. Mich. May 18, 2011). A settling CAA defendant responsible for permit violations at a power plant in Wyandotte, Michigan, must pay a $112,000 civil penalty, must perform a supplemental environmental project at an estimated cost of $210,000, and must install new emission controls and implement operational practices to reduce emissions.

United States v. City of Wyandotte, No. 2-11-cv-12181 (E.D. Mich. May 18, 2011). A settling CAA defendant responsible for permit violations at a power plant in Wyandotte, Michigan, must pay a $112,000 civil penalty, must perform a supplemental environmental project at an estimated cost of $210,000, and must install new emission controls and implement operational practices to reduce emissions.

United States v. Mahard Egg Farm, Inc., No. 3:11-cv-01031-N (N.D. Tex. May 18, 2011). Settling CWA defendants responsible for violations of a concentrated animal feeding operation general permit and related laws and regulations at seven of its facilities in Texas must pay a civil penalty, must take steps to bring each of its facilities into compliance, and must restore the lands to prevent future discharges to area waterways.

United States of America v. BASF Corp., No. 3:11-cv-00222 (S.D. Tex. May 13, 2011). A settling CAA defendant that violated SIP, NESHAP, and new stationary source performance requirements at a chemical manufacturing facility in Freeport, Texas, must pay a $500,000 civil penalty and must meet certain injunctive relief requirements.

United States v. Halliburton Energy Services, Inc., No. 4-07-CV-3795 (S.D. Tex. May 16, 2011). A settling CERCLA defendant responsible for violations at facilities in Houston, Odessa, and Webster, Texas, must pay $815,000 to the United States and $81,500 to Texas in response costs incurred or to be incurred at the sites.

In re Caribbean Petroleum Corp., No. 10-12553 (KG) (Bankr. D. Del. May 20, 2011). Settling CERCLA, CWA, Oil Pollution Act, and RCRA defendants responsible for violations at a petroleum distribution terminal in Bayamón, Puerto Rico, must provide the United States with general unsecured claims totaling $18,725,130 and must pay $8,200,000 in U.S. response costs and penalties.