All pollution generating sources associated with existing land uses and activities, as defined in Appendix 8 of the 2019 Western Washington Phase II Municipal Stormwater Permit, must implement applicable operational source control BMPs as specified in the Ecology manual in order to prevent pollutants from entering the city’s stormwater drainage system. Should applicable operational source control BMPs fail to prevent illicit discharges or allow violations of surface, groundwater, or sediment management standards, applicable structural source control BMPs or applicable treatment BMPs shall be implemented. In cases where the manual(s) lack guidance for a specific source of pollutants, the city shall work with the owner/operator to implement or adapt BMPs based on the best professional judgement of the city. (Ord. 1490 § 1, 2022).