I thank DFB for his comments.
There is no reasonable nexus between Northrop Grumman’s industrial contamination and the natural or unintentional accumulation of natural selenium from WQA’s cleanup project. So Northrup should NOT have to fund superordinary cleanup of selenium. All the consequences of the cleanup activities are probably not foreseeable in any event. If one bird is now found dead (from natural causes) in the San Gabriel River Channel and the media photographs this “normal” death, it may be blown up into a “selenium poisoned” bird death. Any extraordinary cleanup measures ordered by EPA should be funded by EPA. Moreover, not only man, but nature, concentrates natural substances so they are potentially harmful to wildlife. For example, a low level of perchlorate may have been deposited in Southern California when there were inland seas covering the land. EPA comes along a thousand years later and blames industry.