7.3—Where to file.
The petition (original and four copies) accompanied by a statement of service shall be filed with the Administrative Review Board, U.S. Department of Labor, Washington, DC 20210. In addition, copies of the petition shall be served upon each of the following: (a) The Federal, State, or local agency, or agencies involved; (b) the officer issuing the wage determination; and (c) any other person (or the authorized representatives of such persons) known, or reasonably expected, to be interested in the subject matter of the petition.