Which of the following is NOT considered oil pollution?

Oil mixed with dredge spoils is not considered oil pollution because it does not represent a direct release or discharge of oil into the water. Instead, this scenario involves oil being contained within material that has been dredged up from the sea floor. Oil pollution is typically defined as oil that enters the environment uncontrollably, resulting in harm to marine life and habitats. In contrast, the other options involve situations where oil is directly released into the water column or surface, which clearly constitutes pollution. Thus, while dredge spoils may contain oil, the mixture itself does not qualify as an independent pollution event in the same way the other scenarios do.