All dischargers subject to this chapter shall retain and preserve for no less than three years any records, books, documents, memoranda, reports, correspondence and any and all summaries thereof, relating to monitoring, sampling and chemical analyses made by or in behalf of a user in connection with its discharge. All records which pertain to matters which are subject to any enforcement or litigation activities brought by the city pursuant hereto 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. The records retention period may be extended by the city, the state or EPA.
(1999 Code, § 101.22) Penalty, see § 52.999