(a) A programmatic or generic environmental impact statement may be used to assess the environmental effects of:

(b) Generic or programmatic statements should set forth specific conditions or criteria under which future actions will be undertaken or approved, and shall include procedures and criteria for amendments or supplements to reflect impacts, such as specific impacts, which cannot be adequately addressed or analyzed in the initial statement. Such procedures shall include provision for public notice of amendments or supplements which allow for comment thereon in the same manner as was provided by the original statement.

(c) When an individual action is proposed which was encompassed in a programmatic EIS, and the action is to be carried out in conformance with the conditions discussed in the programmatic statement, a subsequent EIS evaluating site-specific impacts should be prepared only if site- specific impacts differ significantly from those addressed in the programmatic statement.

(d) In connection with projects that are to be developed in phases or strategies, the site- specific impacts of the individual project under consideration and, in more general or conceptual terms, the cumulative effects on the environmental and existing natural resource base of subsequent phases of a large project or series of projects that may be developed in the future, and that are under the ownership or control of the same project sponsor, should be discussed. In these cases, this part of the EIS shall discuss the important elements and constraints present in the natural and man-made environment that may bear on the conditions of a decision on the immediate project.