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4. That Section 40-48 (3) (a), (b), and ~(c) (i) of the Code of the City of Portsmouth, Virginia, 1973, be amended to read as follows: Section 40-48. General requirements for parking lots. (3) Construction requirements for improvements: (a) Improvements shall consist of parkway curb or curb and gutter around the entire perimeter of the parking lot, and seven (7) inch thick concrete aprons from property line to curb or edge of street pavement not to exceed fifteen (15) feet in length measured from the edge of street pavement. Improvements shall also include curb and gutter with necessary street widening and sidewalks along all street frontage to the adjoining property and the installation of drainage pipe in ditches. For the expansion of existing parking lots, the city engineer may grant an exception from the construction requirements of ~40-48 (3) (a) if he deems such exception is necessary to prevent a demonstrable hardship upon the property owner, based on the ~elative size of the expansion. The off-site drainage requirements of ~33-56 of the Code of the City of Portsmouth, Virginia shall apply to these developments. (b) Bituminous concrete or Portland cement concrete shall be installed for all street improvemenss and widening and shall be designed and installed subject to the approval of the city engineer according to the street classification and use. All parking facilities shall be paved with Bituminous concrete or Portland cement concrete. The city engineer may require paving surfaces and/or construction techniques which minimize surface storm water run off in areas where it is deemed necessary. The developer may select precast interlocking blocks, porous~type asphalt paving, detention basins, or other methods approved by the city engineer. All drainage calculations for parking areas shall utilize, as a minimum, storm water run off co-efficients for the parking lot as if paved,~in its entirety w~th nonporous Bituminous concrete. In M-1 and M-2 industrial zones, storage lots and service areas away from street frontage will not require paving or sealing as long as same does not result in dust, dirt, sand, gravel and similar materials being deposited or tracked on public streets or rights-of-way.