The purpose of the petroleum extraction (PE) combining district is to designate lands containing productive or potentially productive petroleum resources to promote the development of such resources in a manner compatible with surrounding development. The PE district may be applied only to those areas that are zoned estate (E), residential suburban (RS), professional and administrative office zone (CO), neighborhood commercial (C-1), or regional commercial (C-2). The uses allowed and the regulations established by the PE district shall be in addition to the regulations of the base district with which the PE district is combined. (Ord. 4060 § 3, 2002)