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E9-24163 Prevention of Significant Deterioration and Title V Greenhouse Gas Tailoring Rule Proposed Rule EPA is proposing to tailor the major source applicability thresholds for greenhouse gas (GHG) emissions under the Prevention of Significant Deterioration (PSD) and title V programs of the Clean Air Act (CAA or Act) and to set a PSD significance level for GHG emissions. This proposal is necessary because EPA expects soon to promulgate regulations under the CAA to control GHG emissions and, as a result, trigger PSD and title V applicability requirements for GHG emissions. If PSD and title V requirements apply at the applicability levels provided under the CAA, State permitting authorities would be paralyzed by permit applications in numbers that are orders of magnitude greater than their current administrative resources could accommodate. On the basis of the legal doctrines of "absurd results" and "administrative necessity," this proposed rule would phase in the applicability thresholds for both the PSD and title V programs for sources of GHG emissions. The first phase, which would last 6 years, would establish a temporary level for the PSD and title V applicability thresholds at 25,000 tons per year (tpy), on a "carbon dioxide equivalent" (CO<INF>2</INF>e) basis, and a temporary PSD significance level for GHG emissions of between 10,000 and 25,000 tpy CO<INF>2</INF>e. EPA would also take other streamlining actions during this time. Within 5 years of the final version of this rule, EPA would conduct a study to assess the administrability issues. Then, EPA would conduct another rulemaking, to be completed by the end of the sixth year, that would promulgate, as the second phase, revised applicability and significance level thresholds and other streamlining techniques, as appropriate. 2009-10-27 2009 10 https://www.federalregister.gov/documents/2009/10/27/E9-24163/prevention-of-significant-deterioration-and-title-v-greenhouse-gas-tailoring-rule https://www.govinfo.gov/content/pkg/FR-2009-10-27/pdf/E9-24163.pdf Environmental Protection Agency 145 EPA is proposing to tailor the major source applicability thresholds for greenhouse gas (GHG) emissions under the Prevention of Significant Deterioration (PSD) and title V programs of the Clean Air Act (CAA or Act) and to set a PSD significance level...

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