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1 CFR §601.17

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)The NCPC shall prepare a supplemental EA if five or more years have elapsed since adoption of the EA and:
    1. (1)There are substantial changes to the proposed action that are relevant to environmental concerns; or
    2. (2)There are significant new circumstances or information that are relevant to environmental concerns and have a bearing on the proposed action or its impacts.
  2. (b)The NCPC may supplement a Draft or Final EA at any time to further the purposes of NEPA.
  3. (c)The NCPC shall prepare, circulate, and file a supplement to a Draft or Final EA, and adopt a FONSI in accordance with the requirements of §§ 601.15 and 601.16. If NCPC is not the Lead Agency, it shall proceed as outlined in § 601.16(b) and (c).