Provides standard guidance for designing and implementing a biodegradation treatability study in support of remedy selection testing. Describes a three-tiered approach that consists of: 1) remedy screening testing, 2) remedy selection testing, and 3) remedial design/remedial action testing. Describes and discusses the applicability and limitations of biodegradation technologies, and defines the prescreening and field measurement data needed to determine if treatability testing is required. 30 charts, tables and graphs.