Where the Director of Human Resources Management determines that a particular vacant classified service position within a class of work has characteristics which make it unique to or unrepresentative of, all other positions allocated to said class of work, the Director of Human Resources Management may announce a special competitive promotional or recruitment examination, whichever is required as provided in Section 16-152, above, applicable only to the particular vacant position. In the event any such special competitive promotional or recruitment examination is announced, the provisions of Section 16-154, above, shall apply to such announcement with respect to its contents and distribution, except that the announcement may cite the position title and position description in lieu of the class title and class standard for the particular vacant position. As used in this Section, a position is unique to or unrepresentative of, other positions within the same class of work if, on the basis of the location of the position within a given department, agency, or office, the position should be most appropriately occupied by an eligible who can accommodate atypical or unusual working conditions and/or by an eligible who possesses specialized knowledge, skills, or abilities if said knowledge, skills or abilities are consistent with the qualification requirements applicable to the particular position.