There shall be provided outside the public or private right-of-way the minimum number of parking spaces required in Section 1155 of this Zoning Code. Where appropriate, common driveways, parking areas, walks and steps shall be provided, maintained and lighted for night use. Screening of parking or service areas may be required through ample use of trees, shrubs, hedges and screening devices. All parking spaces and service drives shall be improved with bituminous, concrete or equivalent surfacing and so graded and drained to properly collect all surface water accumulation within the area. All paved parking areas in PD districts shall be curbed to City street specifications.