(a) For actions that require environmental assessments or environmental impact statements, NASA will undertake programmatic-level analysis for actions that are similar in nature, broad in scope, or likely to have similar environmental effects, as applicable. Programmatic NEPA analyses may take place in the form of an environmental assessment or environmental impact statement.
(b) Tiering from previously prepared environmental impact statements or environmental assessments is appropriate when it would eliminate repetitive discussions of the same issues and exclude from consideration issues already decided. Tiering from a programmatic-level NEPA document is appropriate for site- or project-specific actions that are included within the scope of the programmatic-level analysis.
(c) NASA may use programmatic environmental impact statements or environmental assessments without additional review for five years from the publication date unless there are substantial new circumstances or information about the significance of adverse effects that bear on the analysis
(d) After five years, NASA may use programmatic environmental impact statements and environmental assessments after the analysis and assumptions in the environmental impact statement or environmental assessment are reevaluated to ensure reliance of the analysis is still valid. Reevaluation will be documented in a record of environmental consideration or memorandum to the file, including explanation for why the analysis remains valid considering any new and substantial information or circumstances.
(e) NASA may rely on another Federal agency's environmental impact statement or environmental assessment, or portion thereof, if NASA conducts an independent review of the document and concludes that it meets the standards for an adequate environmental impact review, pursuant to this part and 42 U.S.C. 4321 et seq. When relying on an environmental impact statement, environmental assessment, or portion thereof, NASA will cite, briefly describe the content and relevance to the environmental document, and may make modifications that are necessary to render the relied-upon document, or portion thereof, fit for fulfilling NEPA's analytic requirements for the action at hand.
(1) If the actions covered by the original environmental impact statement or environmental assessment and the proposed action are substantially the same, NASA will republish the relied-upon statement or assessment.
(2) If the actions are not substantially the same, NASA may modify the statement or assessment as necessary to render the statement fit for fulfilling NEPA's analytic requirements for the action at hand, and publish the relied-upon statement or assessment, as modified. Where appropriate, NASA may solicit comment to the extent that solicitation of comment will assist NASA in expeditiously adapting the relied-upon statement or assessment so that it is fit for NASA's purposes.
(f) NASA shall include by reference material such as planning studies, analyses, or other relevant information, into an environmental impact statement or environmental assessment when the effect will be to cut down on bulk without impeding NASA and public review of the action. NASA shall cite the referenced material in the document and briefly describe its content. NASA shall not include material by reference unless it is reasonably available for inspection by potentially interested persons. NASA shall not include by reference material based on proprietary data that is not available for review and comment. NASA shall not use inclusion by reference to evade the statutory page limits.