(a) All uses existing at the effective date of this ordinance which would be classified as conditional uses in the particular zoning district concerned if they were to be established after the effective date of this ordinance, are hereby declared to be conforming conditional uses to the extent of the existing operation only. Any addition, alteration, extension, repair or other proposed change in the existing operation shall be subject to the conditional use procedures as if such use were being established anew.

(b) Campgrounds; contractor yards; salvage, wrecking, junk, demolition, and scrap yards; towing services; mineral extraction and related uses; and sanitary landfill uses shall within 180 days after the effective date of this ordinance register with the Department of Planning and Development and submit pertinent data relative to the present operation, including the boundaries of the operation, ownership data, maps or site plan showing the existing layout, and such other data as may be necessary to enable the Department of Planning and Development to create a permanent file establishing the size, layout and operational characteristics of the existing operation. A permit shall be granted to such existing operations for the extent of the existing operation only. The Department of Planning and Development may make a finding that an adequate file already exists concerning an existing operation and may accordingly waive the registration requirement and issue a permit accordingly. Notwithstanding the fact that the aforementioned use may not be permitted within a given district, any addition, extension, or change in the operation of the aforementioned uses may be permitted; provided, that such addition, extension or change shall be subject to the conditional use procedures set forth in this ordinance.

(c) Any other use not mentioned above which was a conforming conditional use before adoption or amendment of this ordinance, but is not a permitted conditional use in the district in which it is now located, shall be considered a legal nonconforming use and shall be subject to the requirements of section 12.39.010 through 12.39.110 of this ordinance. [Code § 12.29-6.]