(a) Except as provided in paragraph (b) of this section, the text of an environmental impact statement will not exceed 150 pages, not including citations, appendices, explanatory maps, diagrams, graphs, tables, and other means of graphically displaying quantitative or geospatial information.
(b) An environmental impact statement for a proposed agency action of extraordinary complexity is strictly prohibited from exceeding 300 pages, not including any citations, appendices, explanatory maps, diagrams, graphs, tables, and other means of graphically displaying quantitative or geospatial information. NASA will determine at the earliest possible stage of preparation of an environmental impact statement whether the conditions for exceeding the page limit in paragraph (a) of this section are present.
(c) Appendices are to be used for voluminous materials, such as scientific tables, collections of data, statistical calculations, and the like, which substantiate the analysis provided in the environmental impact statement. Appendices are not to be used to provide additional substantive analysis, because that would circumvent the congressionally mandated page limits.
(d) Environmental impact statements will be prepared on 8.5″ x 11″ paper with one-inch margins using a word processor with 12-point proportionally spaced font, single spaced. Footnotes may be in 10-point font. Such size restrictions do not apply to explanatory maps, diagrams, graphs, tables, and other means of graphically displaying quantitative or geospatial information, although pages containing such material do count towards the page limit when an item of graphical material is larger than 8.5″ x 11″, each such item will count as one page.
(e) The breadth and depth of analysis in an environmental impact statement will be tailored to ensure that the environmental impact statement does not exceed these page limits. In this regard, as part of the finalization of the environmental impact statement, a certification will be incorporated into the environmental impact statement certifying that NASA has considered the factors mandated by NEPA; that the environmental impact statement represents NASA's good-faith effort to prioritize documentation of the most important considerations required by the statute within the congressionally mandated page limits; that this prioritization reflects NASA's expert judgment; and that any considerations addressed briefly or left unaddressed were, in NASA's judgment, comparatively unimportant or frivolous.