Each PD that is primarily non-manufacturing in character shall provide for uniform underground installation of utilities, including, for example, electricity, telephone, and cable television. In PDs that are primarily manufacturing in character, utilities shall be installed as approved by the City. Utility installation and maintenance of facilities shall be in accordance with the requirements and regulations of the City and of the utility authority having the right of installation and maintenance. A PD shall not be approved unless adequate assurance is given that adequate public or central water and sanitary sewers will be available at the first occupancy.