SIP Proposal: Pennsylvania (nitrogen oxides emission limits and requirements for coal-fired electric generating units equipped with selective catalytic reduction at Keystone, Conemaugh, Homer City, and Montour facilities).

SIP Proposal: North Dakota (partial approval and partial disapproval of regional haze plan for second implementation period).

United States v. Enbridge Energy, LP, No. 1:16-cv-914 (W.D. Mich. June 29, 2024). A proposed eighth modification to a consent decree concerning two separate oil spills in Michigan and Illinois in 2010 would require settling CWA and OPA defendants to investigate circumferential crack features in four pipelines; revise the methods used for assessing whether a circumferential crack must be excavated and repaired; adjust certain requirements relating to repair and mitigation of circumferential crack features; eliminate two requirements relating to circumferential cracks; and enable defendants to seek early termination of certain requirements relating to circumferential crack features.

SIP Approval: Wisconsin (second 10-year 2006 24-hour fine particulate matter limited maintenance plan). 

EPA proposed to promulgate a federal implementation plan under the CAA consisting of nonattainment new source review rules for areas within the jurisdiction of the Mojave Desert Air Quality Management District in which air pollutant concentrations are above specific NAAQS. 

SIP Approval: California (revisions to motor vehicle inspection and maintenance program).