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In 2012, the EPA promulgated the Oil and Natural Gas Sector: New Source Performance Standards. We received several petitions for administrative reconsideration of the rule. Certain time critical issues were addressed in a reconsideration EPA promulgated in 2013. When evaluating the additional issues raised in the petitions for reconsideration, we received significant additional information requiring further evaluation of potentially significant sources of emissions currently uncovered by the NSPS, including, completions of hydraulically fractured oil wells, liquids unloading, and leaks. This action will include regulation of additional sources deemed appropriate, and will address remaining implementation issues, such as monitoring and testing of storage vessel control devices.