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" (2) The pavement base and surface of streets shall be appropriate to the type of development and type of use contemplated and shall be installed in accordance with standards and specifications of the city. The thickness of base and pavement shall be determined by actual soil bearing tests of the California Bearing Ratio type or its equivalent (performed at the expense of the subdivider by an approved testing laboratory at locations specified by the City Engineer) and by anticipated traffic loading methods developed by the Asphalt Institute or the Portland Cement Association. (3) A drainage system shall be provided to ensure adequate drainage of both natural and stormwater. The system shall be constructed and installed in accordance with plans and specifications approved by the City Engineer. The subdivider shall be required to install necessary drainage facilities outside the property limits of the land owned or controlled by the subdivider but necessitated, at least in part, by the construction or improvement of the subdivision. (4) Curbs and gutters shall be installed in accordance with the plans and specifications approved by the City Engineer and shall be designed in accordance with the Traditional Neighborhood Design provisions contained within the Virginia Department of Transportation's Subdivision Street Design Guide, as last amended, and the City of Portsmouth Master Transportation Plan. The use of valley gutters shall be avoided. (5) Water lines shall be installed by the subdivider in accordance with plans and specifications approved by the director of public utilities. The subdivider shall be required to install necessary water facilities outside the property limits of the land owned or controlled by the subdivider but necessitated, at least in part, by the construction or improvement of the subdivision. (6) Sanitary sewerage shall be installed by the subdivider in accordance with plans and specifications approved by the director of public utilities. The subdivider shall be required to install necessary sanitary sewage facilities outside the property limits of the land owned or controlled by the subdivider but necessitated, at least in part, by the construction or improvement of the subdivision. (7) Sidewalks, at least five feet in width, shall be installed on both sides of all arterial and collector streets. Sidewalks, at least five feet in width, shall be installed along all street frontage planned for apartments or townhouses. Sidewalks, at least five feet in width, shall be required along one side of all minor and cul-de-sac streets; however, the Planning Commission may reduce or eliminate the requirements on any minor street, as defined in section 33.1-2 of the city Code, or cul-de-sac. The commission must find that such reduction will not create a pedestrian safety hazard. Sidewalks shall be installed in accordance with plans and specifications of the city and must include ramps for wheelchair access at all intersections in accordance with the requirements ofthe Americans with Disabilities Act and in accordance with any revisions approved by the Federal Highway Administration. (8) Standard city street signs shall be installed at all street intersections. (9) Necessary traffic-control devices, including, but not limited to, traffic signals or traffic signs which are required within the subdivision or adjacent thereto and which are approved by the traffic engineer, shall be installed. (10) Street lights shall be installed by the subdivider in accordance with the standards and specifications approved by the traffic engineer. The subdivider shall pay the cost of installation thereof and all costs to be incurred for the operation and maintenance thereof during the first year following the completion of installation. (11) Bridge widths shall be designed to the ultimate right-of-way width. Sidewalks shall be provided on both sides of bridges unless waived by the City Engineer. Timber construction, including timber pilings, shall not be permitted. Bridges shall be designed for H-20 loading (minimum). Architectural and ornamental work on bridges shall be Page 27 of 33