The Department of Natural Resources proposed amendments to 10 CSR 20-7.050, Methodology for Development of Impaired Waters List. This rule describes the process used to develop the list of impaired waters as required by CWA § 303(d) for the purpose of identifying those waters that do not fulfill their designated uses and require the development of TMDLs. http://www.sos.mo.gov/adrules/moreg/current/2008/v33n20/v33n20b.pdf p. 1871.