U.S. Supreme Court Justice Stephen Breyer's bookBreaking the Vicious Circle: Toward Effective Risk Regulationexamines government's role in controlling and managing the health risks society faces from exposure to environmental pollution. One major problem examined in the book is the cleanup of hazardous waste sites. Justice Breyer was extremely critical of policymakers who wish to see waste sites 100 percent clean.

Explain, using the theory of optimization and a graph, the circumstances under which a waste site could be made "too clean."You may either describe your graph in detail or post a photo of your graph for the class to see.

Good answers are dispassionate and employ economic analysis.