EPA announced the availability of and seeks comment on an update to the interim guidance on the destruction and disposal of per- and polyfluoroalkyl substances (PFAS) and materials containing PFAS; the updated guidance builds on information pertaining to technologies that may be feasible and appropriate for the destruction or disposal of PFAS and PFAS-containing materials, and identifies key data gaps and uncertainties that must be resolved before EPA can issue more definitive recommendations about PFAS destruction and disposal technologies.

EPA finalized a rule to remove the Title V permitting requirements for air curtain incinerators that only burn wood waste, clean lumber, yard waste, or a mixture of those, and are not located at title V major sources or subject to Title V for other reasons. 

NMFS announced its intent to conduct a five-year review of the endangered western distinct population segment of the Steller sea lion. 

United States v. Colonial Oil Industries, Inc., No. 4:24-cv-00069-RSB-CLR (S.D. Ga. Apr. 10, 2024). Under a proposed consent decree, a settling CAA defendant that allegedly failed to meet renewable fuel volume obligations for fuel it supplied to certain marine vessels and produced and sold gasoline that exceeded the applicable volatility standard must purchase and retire over 9 million renewable identification number credits, estimated to cost approximately $12.2 million, and pay a civil penalty of approximately $2.8 million.  

The National Highway Traffic Safety Administration proposed to establish two new federal motor vehicle safety standards specifying performance requirements for all motor vehicles that use hydrogen as a fuel source. 

EPA finalized changes to its test procedures required to be used by industries and municipalities when analyzing the chemical, physical, and biological properties of wastewater and other samples for reporting under the NPDES permit program. 

SIP Proposal: California (revisions to meet requirements for the 1997 eight-hour ozone NAAQS in the Riverside County nonattainment area). 

SIP Proposal: Arizona (revisions concerning emissions of volatile organic compounds, nitrogen oxides, particulate matter, and sulfur oxides for the Maricopa County Air Quality Department).  

United States v. Villegas, No. 1:24-cv-962 (D. Colo. Apr. 10, 2024). Under a proposed consent decree, settling CWA defendants that discharged pollutants without a permit into waters of the United States must restore impacted areas. 

United States v. Lexington-Fayette Urban County Government, No. 5:06-cv-386-KSF (E.D. Ky. Apr. 10, 2024). A proposed material modification to a consent decree concerning alleged violations of the CWA stemming from the settling defendant's operation of its sanitary sewer system and wastewater treatment plant extends the final compliance deadline for remedial projects by four years to December 31, 2030, and makes changes to reporting frequency and methods.