Approval and Promulgation of Air Quality Implementation Plans; District of Columbia; Interstate Transport Requirements for the 2010 1-Hour Sulfur Dioxide Standard

The Environmental Protection Agency (EPA) proposes to approve the state implementation plan revision submitted by the District of Columbia. This revision pertains to the infrastructure requirement for interstate transport pollution with respect to the 2010 1-hour sulfur dioxide national ambient air quality standards. In the Final Rules section of this Federal Register, EPA is approving the District's SIP submittal as a direct final rule without prior proposal because the Agency views this as a noncontroversial submittal and anticipates no adverse comments. A more detailed description of the state submittal and EPA's evaluation is included in a technical support document (TSD) prepared in support of this rulemaking action. A copy of the TSD is available, upon request, from the individual listed in the FOR FURTHER INFORMATION CONTACT section of this document or is also available electronically within the Docket for this rulemaking action. If no adverse comments are received in response to this action, no further activity is contemplated. If EPA receives adverse comments, the direct final rule will be withdrawn and all public comments received will be addressed in a subsequent final rule based on this proposed rule. EPA will not institute a second comment period. Any parties interested in commenting on this action should do so at this time.