The R-R Rural Residential District is established to accommodate a population density of approximately one family per two acres in order to provide for very low density residential development and thereby prevent more intense development in areas without centralized sewer or water facilities. Uses that require a higher standard or greater con centration of public utilities shall be excluded from an R-R district. The R-R district is also intended as a temporary holding zone for newly-annexed land until the owner requests a permanent zoning classification.