All occupants shall provide, locate and use an adequate and centralized area for the collection of garbage and waste material, which area shall be screened with a six foot chain link fence made with redwood privacy slats enclosing said area or such other screening as may be approved by the Planning Board. Garbage shall be placed in a separate container and waste material in another separate container and they shall be removed as frequently as may be necessary to maintain the area in a safe, sanitary and healthful condition;