14 CFR § 1216.308 - Supplemental EAs and EISs.
As detailed in CEQ regulations, supplemental documentation may be required for previous EAs or EISs (see 40 CFR 1502.9). If changed circumstances require preparation of a supplemental EA or EIS, such document will be prepared following the same general process as the original EA or EIS. No new scoping is required for a supplemental EIS; however, NASA may choose to conduct scoping.
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