It shall be the obligation of any person owning or having control over oil entering waters of the state in violation of RCW 90.56.320 to immediately collect and remove the same. If it is not feasible to collect and remove, said person shall take all practicable actions to contain, treat and disperse the same. The director shall prohibit or restrict the use of any chemicals or other dispersant or treatment materials proposed for use under this section whenever it appears to the director that use thereof would be detrimental to the public interest.