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Sec. 33.1-49. Utility and street improvements. (a) In subdivisions, or parts of subdivisions, improvements shall be provided by the subdivider as follows: (1) Streets shall be graded to the full width and shall be designed in accordance to the approved cross-sections and profiles and 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. (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,