(1) An area within a distance of two-thirds of a mile of the city limits of incorporated cities and towns and the same distance from the center of any unincorporated town comprised of ten or more inhabited, closely grouped residences within Area 4 exclusive of Area 2.

(2) Area 3 restrictions. The aerial application of use restricted herbicides is prohibited within Area 3: Provided, That the department, upon written request, may issue a permit to allow aerial applications of nonvolatile formulations of use restricted herbicides up to one-half mile of the city limits of incorporated towns and cities and up to one-half mile of the center of any unincorporated towns comprised of ten or more inhabited closely grouped residences.