Purpose. It is the purpose of this zone to preserve areas exclusively for heavier industrial uses within the City. It is important that zone regulations and design standards not be sacrificed to allow overdevelopment of properties, as this would negatively impact upon the utility of the industrial areas and upon the quality of life of adjoining residential areas. Strict adherence to design standards is deemed important, as is the absolute integrity of these zones, because of the difficulty in siting and because of the limited supply of land available.