The Department of Public Health and the Environment adopted amendments to 5 Colo. Code Regs. §1002-31, The Basic Standards and Methodologies for Surface Water; and §1002-41, The Basic Standards for Ground Water. The amendments adopt aquatic life-based standards for nonylphenol and 1,4 dioxane. http://www.sos.state.co.us/CCR/Upload//AGORequest//AdoptedRules02009-00625.RTF. ; and http://www.sos.state.co.us/CCR/Upload//AGORequest//AdoptedRules02009-00626.RTF