Open off-street parking and loading areas shall be improved with a compacted gravel base and hard surfaced with asphaltic concrete or portland cement concrete as herein provided. If asphaltic concrete surfacing is used then the base shall be compacted CA-6 stone of a thickness to be determined by the city engineer, same to be required to be not less than six inches in thickness and the asphaltic concrete surfacing shall be of a thickness to be determined by the city engineer, same to be required to be not less than two inches in thickness. If portland cement concrete surfacing is used, then the concrete shall be of a minimum compression strength of four thousand (4,000) pounds PSI, no base shall be required but the portland cement concrete surfacing shall be of a thickness to be determined by the city engineer, same to be required to be at least six inches of unreinforced concrete. In determining the thickness of the compacted base and the paving the owner/developer (utilizing his engineer) must submit suitable design for the intended use for their parking and loading areas to the city engineer for his review and recommendation. The aforesaid standards are the minimum standards the city engineer may allow for parking and loading areas and are not necessarily the standards the city engineer will require. In determining the thickness of the compacted base and the paving the owner/developer shall take into account the volume and type of the motor vehicle traffic that will be utilizing the parking and/or loading area and the weight bearing properties required for the contemplated usage of the parking and/or loading area. The developer must submit to the city engineer the construction plans for the proposed parking and/or loading areas prepared by a professional engineer and suitably designed for its intended use. (Ord. 1742 § 1 (part), 1999)