40 CFR 1501.3 - When to prepare an environmental assessment.

§ 1501.3 When to prepare an environmental assessment.
(a) Agencies shall prepare an environmental assessment (§ 1508.9) when necessary under the procedures adopted by individual agencies to supplement these regulations as described in § 1507.3. An assessment is not necessary if the agency has decided to prepare an environmental impact statement.
(b) Agencies may prepare an environmental assessment on any action at any time in order to assist agency planning and decisionmaking.

Title 40 published on 2013-07-01

no entries appear in the Federal Register after this date.

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United States Code
Presidential Documents

Executive Order ... 11514

Executive Order ... 11991