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