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The EPA is proposing the electronic submission of performance testing information already collected by industry by revising the reporting requirements in 40 CFR part 63 for national emission standards for hazardous air pollutants (NESHAP). In addition to performance test data, this rulemaking proposes to require the electronic submission of other selected compliance data, such as excess emissions reports, that are already being compiled and submitted by industry to regulatory authorities. These data can be used for regulation development, control strategy development, rule effectiveness studies, risk analyses and other air pollution control activities. Revision of the subparts in 40 CFR part 63 will be handled by a phased approach. This rulemaking is the first phase in the revision process and will address select subparts in 40 CFR part 63. A similar rulemaking for the subparts in 40 CFR part 60 was proposed on March 20, 2015.