(Amended by Ordinance Nos. 172879 and 185397, effective July 6, 2012.) All dischargers subject to this Chapter shall retain and preserve for no less than 3 years all records, books, documents, memoranda, reports, correspondence and summaries relating to monitoring, sampling and chemical analyses made by or in behalf of the discharger in connection with its discharge. This period of retention may be extended per 40 CFR 493.12(o)(2) when requested by the Director, DEQ, or EPA during the course of any unresolved litigation regarding the discharger. The discharger shall retain and preserve all records which pertain to matters which are the subject of any enforcement or litigation activities brought by the City until all enforcement activities have concluded and all appeals deadlines have expired.