“Stormwater pollution” for purposes of mitigation does not include runoff at a specific facility even if there is no point source at the facility. This pollution is from used oil and oil byproducts, often mixed with other solid waste, and is typically dispersed by urban stormwater and marina or boating activities, or both.
Source:
Section 48620.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PRC§ionNum=48620.5..