The following base zone districts are established as applicable to the unincorporated areas of Story County, Iowa: A-1 Agricultural, A-2 Agribusiness, A-R Agricultural-Residential, R-1 Transitional Residential, R-2 Urban Residential, RMH Residential Manufactured Housing, C-LI Commercial/Light Industrial, GB-C Greenbelt-Conservation, HI Heavy Industrial. It is the further intent of these regulations to protect the groundwater resources to the maximum extent practical through proper management of sources and routes of contamination within each District.