On appeal, the Commission maintains, relying on Solite, 952 F.2d at 484, and
Building Industry, 247 F.3d at 1246, that the extra-record materials simply filled
gaps in the rulemaking record and “only confirmed the findings delineated in the
[NOPR].” Respondent’s Br. at 46. By this, the Commission suggests that the
neither Solite, 952 F.2d at 484, nor Building Industry, 247 F.3d at 1246, suggest
that an agency generally may rely, without affording comment, on data critical to
support a rule solely because the existing record contains a deficiency that extra–
record data might cure.
[10] Link to KeyCite Notes Rather, for extra-record data to be “supplementary,” it
study that “confirmed the findings delineated in the proposal,” was supported by
data in the record, and “provided additional support for that hypothesis.” See 247
F.3d at 1246 (emphasis added). Similarly, the Commission’s reliance on the
statement in Association of Data Processing “that the ‘administrative record’
might well include crucial material that was neither shown to nor known by the
use extra-record data in its response because the Chamber has not, as we have
required, shown that it was prejudiced by its lack of opportunity to comment. See
Solite, 952 F.2d at 484 (citing Community Nutrition, 749 F.2d at 57-58, and Air
Transp. Ass’n, 732 F.2d at 224); see also Air Canada v. Dep’t of Transp., 148
F.3d 1142, 1156-57 (D.C.Cir.1998) (citing 5 U.S.C. § 706). To show prejudice,
particularly robust showing of prejudice in notice-and-comment cases, holding
that “an utter failure to comply with notice and comment cannot be considered
harmless if there is any uncertainty at all as to the effect of that failure.” Sugar