Section 52.515 - Original identification of plan section(a) This section identifies the original "Air Implementation Plan for the District of Columbia" and all revisions submitted by the District of Columbia that were federally approved prior to July 1, 1998. The information in this section is available in the 40 CFR, part 52 edition revised as of July 1, 1999, the 40 CFR, part 52, Volume 1 of 2 (§§ 52.01 to 52.1018 ) editions revised as of July 1, 2000 through July 1, 2011, and the 40 CFR, part 52, Volume 1 of 3 (§§ 52.01 to 52.1018 ) edition revised as of July 1, 2012. 78 FR 33984 , June 6, 2013