All users subject to <cite data-path="|25">this article</cite> shall retain and preserve for not less than 3 years any records, books, documents, memoranda, reports, and correspondence and any and all summaries thereof, relating to monitoring, sampling, and chemical analyses made by or on behalf of a user in connection with its discharge. All records which pertain to matters which are the subject of administrative action or any other enforcement or litigation activities undertaken by the City shall be retained and preserved by the user until all enforcement activities have concluded and all periods of limitation with respect to any and all appeals have expired. City Code, 1976/83, art. 25, §6(c) Ord. 84-129 Ord. 91-775