(a) If an action under consideration by the division may involve a “major Federal action significantly affecting the quality of the human environment under the National Environmental Policy Act of 1969,” then the procedures specified in this section shall be followed.

(b) In the case of an action for which there has duly been prepared under the National Environmental Policy Act of 1969, both a draft environmental impact statement and a final environmental impact statement, the division shall have no obligation to prepare a SEQR EIS or to make findings pursuant to section 2550.12 of this Part, provided that such environmental impact statements either contain or are supplemented by the matters described in paragraphs (7) and (8) of subdivision (d) of 6 NYCRR 617.6 relating to growth inducement and energy use and conservation.

(c) In the case of an action for which has been prepared a negative declaration or other written threshold determination that the action will not require a Federal impact statement under the National Environmental Policy Act of 1969, the division shall determine whether or not the action may have a significant effect on the environment pursuant to article 8 of the Environmental Conservation Law, 6 NYCRR Part 617 and this Part and the action shall be fully subject to such law and rule and regulations.