Adequacy Status of Motor Vehicle Budget in Submitted Five Percent Plan for PM-10 for the Phoenix Metropolitan Nonattainment Area for Transportation Conformity Purposes; Arizona
In this notice, EPA is notifying the public that the Agency has found that the motor vehicle emissions budget in the submitted MAG 2007 Five Percent Plan for PM-10 for the Maricopa County Nonattainment Area (December 2007) (``2007 MAG 5% Plan'') is adequate for transportation conformity purposes. The 2007 MAG 5% Plan was submitted to EPA on December 21, 2007 by the Arizona Department of Environmental Quality as a revision to the Arizona state implementation plan. The 2007 MAG 5% Plan includes a demonstration of no less than five percent annual emissions reductions in particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM-10) and a demonstration of PM-10 attainment in the Phoenix metropolitan area by 2010. As a result of our finding, the Maricopa Association of Governments and the U.S. Department of Transportation must use the motor vehicle emissions budget from the submitted five percent plan for PM-10 for future conformity determinations.
Notice of Availability for the Framework for Application of the Toxicity Equivalence Methodology for Polychlorinated Dioxins, Furans, and Biphenyls in Ecological Risk Assessment
The U.S. Environmental Protection Agency (EPA) is announcing the availability of the final ``Framework for Application of the Toxicity Equivalence Methodology for Polychlorinated Dioxins, Furans, and Biphenyls in Ecological Risk Assessment'' (EPA/100/R-08/004). The purpose of the Framework is to assist EPA scientists in using the toxicity equivalence methodology to assess ecological risks from mixtures of dioxin-like chemicals, i.e., polychlorinated dibenzo-p- dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs), as well as to inform EPA decision makers, other agencies, and the public about this methodology. This framework provides an introduction to the toxicity equivalence methodology, offers considerations for how and when to apply the methodology, and presents practical examples of its use. The Framework thus serves to enhance the application of the best available science. This document is not intended to serve as guidance on how to conduct a comprehensive risk assessment for dioxin-like chemicals or to act as a regulation or binding policy. EPA's Risk Assessment Forum oversaw the development of this document, incorporating input obtained from an expert workshop, scientists throughout the Agency, stakeholders, and a peer review by twelve experts from a range of scientific disciplines.
Board of Scientific Counselors, Homeland Security Subcommittee Meeting-July 2008
Pursuant to the Federal Advisory Committee Act, Public Law 92- 463, the Environmental Protection Agency, Office of Research and Development (ORD), gives notice of a meeting of the Board of Scientific Counselors (BOSC) Homeland Security Subcommittee.
Standards of Performance for Portland Cement Plants
The EPA is proposing amendments to the current Standards of Performance for Portland Cement Plants. The proposed amendments include revisions to the emission limits for affected facilities which commence construction, modification, or reconstruction after June 16, 2008. The proposed amendments also include additional testing and monitoring requirements for affected sources.