Where requested records contain matters which are exempted under 5 U.S.C. 552(b) but which matters are reasonably segregable from the remainder of the records, they shall be disclosed by the Board with deletions. To each such record, the Board shall indicate, if technically feasible, the precise amount of information deleted and the exemption under which the deletion is made, at the place in the records where the deletion is made, unless including that indication would harm an interest protected by the exemption.