To provide living areas at the fringe of the City's corporate areas which combine certain advantages of both urban and rural location by limiting development to very low density concentrations of one family dwellings and permitting limited numbers of animals to be kept for pleasure or hobbies, generally free from activities of a commercial nature; further, to provide transition or buffer areas between intense residential uses and agricultural preserves to avoid conflicts of use and to facilitate and encourage the provision of decent, affordable housing for farm workers by not requiring a conditional use permit, zoning variance, or other zoning clearance for farm worker housing that is not required of any other Residential Agricultural (RA) zone.