The purpose of this assessment is to make an "effects determination" for the Barton Springs salamander (Eurycea sosorum) by evaluating the potential direct and indirect effects of currently registered uses of the insecticide carbaryl within the Barton Springs area (action area) on the survival, growth, and reproduction of this federally-listed endangered species. This assessment was completed in accordance with the U.S. Fish and Wildlife Service (USFWS) and National Marine Fisheries Service (NMFS) Endangered Species Consultation Handbook (USFWS/NMFS, 1998 and procedures outlined in the Agency's Overview Document (U.S. EPA, 2004).