Before circulating a DEIS for external review, the official responsible for the DEIS shall receive the concurrence of the Associate Administrator for Planning and Evaluation and the Chief Counsel; and prepare a memorandum for approval by the Administrator which shall:

(a) Set forth the basis on which it was determined that a potentially significant environmental effect exists;

(b) Attach the DEIS;

(c) Identify the Federal, State, and local agencies and private sources from which comments on the DEIS are proposed to be solicited (see Attachment 2);1 and

(d) Include a recommendation on whether a public hearing on the proposed action should be held.