Acknowledgements Staff wishes to thank and acknowledge John DaMassa and Ajith Kaduwela of the Air Resources Board's Planning and Technical Support Division for sponsoring the SAPRC-07 peer review, the Reactivity Research Advisory Committee for participating in the amendment process, and Priya Singh for her assistance for preparing report appendices. This report has been prepared by staff of the California Air Resources Board. Publication does not signify that the contents reflect the views and policies of the Air Resources Board, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. Proposal Summary The Air Resources Board (ARB or Board) staff proposes to revise the table of Maximum Incremental Reactivity (MIR) values 1 for existing reactive organic compounds, and add about 380 new compounds or mixtures with MIR values, into section 94700 of title 17, California Code of Regulations (CCR). We also propose to modify MIR values for 24 bins of hydrocarbon solvents, in section 94701, title 17, CCR. Background The existing Tables of MIR Values are based on work of Dr. William Carter at the University of California, Riverside that was mainly conducted in the 1990's. The Tables of MIR Values are contained in two sections of title 17, CCR. Section 94700 contains the MIR values for individual reactive organic compounds and mixtures. Section 94701 contains the MIR values for 24 different bins of hydrocarbon solvents. At its June 22, 2000, public hearing, the ARB approved amendments to the " Regulation for Reducing the Ozone Formed from Aerosol Coating Products " , and approved Tables of MIR Values. The main component of the rulemaking was to establish reactivity limits for 36 aerosol coating categories based on the MIR scale. In Resolution 00-22, which approved the rulemaking action, the Board directed the Executive Officer to review the MIR values periodically to determine if modifications to the MIR values were warranted. This is because the chemical mechanism used to calculate the MIR values has been evolving and improving, as new chemical information becomes available. Since any changes to the MIR values would be technical in nature, the Board also delegated to the Executive Officer the authority to adopt regulatory amendments to the Tables of MIR Values, and to conduct public hearings and take other appropriate actions to make such amendments. This delegation of authority allows the Executive Officer (or his delegate) to conduct these activities on behalf of …