Off-street parking. Off-street parking facilities shall be provided at the rate of one space for every 200 square feet of floor area. Parking areas shall be graded, surfaced, drained and suitably maintained to the satisfaction of the Village Engineer to the extent necessary to avoid nuisance of dust, erosion or excessive water flow across public ways or adjacent lands. Standards established by the Engineering Department of the Town of Oyster Bay (see publication of July 16, 1963, Design Guide to Site Work Requirements for Commercial and Industrial Building Permit Applicants: Paving of Parking Fields) shall serve as a guide. The Village Engineer may require the plan to provide for suitable markings to indicate individual parking spaces, maneuvering area, entrances and exits. Required parking facilities shall be reserved at all times to those persons who are employed at or make use of the shopping center. The owner or lessee of the shopping center shall maintain the parking area in a clean and orderly condition, including the clearing or removal of snow when necessary.