No present or future agricultural operation or any of its appurtenances conducted or maintained for commercial purposes and in a manner consistent with proper and accepted customs and standards of the agricultural industry on agricultural land shall become or be a nuisance, private or public, due to any changed condition of the use of adjacent land in or about the locality thereof; provided, that the provisions of this section shall not apply whenever a nuisance results from the neglect or improper operation of any such agricultural operation and its appurtenances or if the agricultural activity or appurtenances obstruct the free passage or use in the customary manner of any navigable lake, stream, river, canal or basin or any public park, square, street or highway. (Ord. 2000-61 § 1 (part): prior gen. code § 3-312.0)