The book is based upon a lengthy review conducted by the Hypoxia Advisory Panel (HAP) of the Science Advisory Board for the Environmental Protection Agency (EPA) chaired by Virginia Dale. The report upon which the book is based has been extensively reviewed.The project’s web site contains numerous review comments about the report, all of which have been addressed.In addition the draft report was review by four vetters who were paid by the EPA Science Advisory Board (SAB) to review the report.Those comments were addressed to the satisfaction of the EPA SAB Chapter Board.The book has been enthusiastically received by the SSEM series editors.