(1) A cover letter or memo shall precede every EIS, but shall not be considered part of the EIS for adequacy purposes.

(2) The cover letter or memo:

(a) Shall not exceed two pages;

(b) Shall highlight the key environmental issues and options facing agency decision makers as known at the time of issuance;

(c) May include beneficial, as well as adverse environmental impacts and may mention other relevant considerations for decision makers;

(d) Shall identify, for SEIS's, the EIS being supplemented.