Prior to the grant of final approval, the developer shall submit to the Board a written instrument from each serving utility which shall evidence full compliance with the provisions of this section; provided, however, that lots of such subdivisions which abut existing streets where overhead electric or telephone distribution supply lines have theretofore been installed on any portion of the streets involved may be supplied with overhead service, but the service connections must be underground. The location of access facilities for servicing the utility shall be developed in conjunction with and as a part of the development application.