This document presents an estimate of mercury deposition from the atmosphere to the Savannah River watershed. This analysis was done to support the development of a Total Maximum Daily Load (TMDL) limit for the Savannah River watershed under the requirements of the Clean Water Act. The purpose of the TMDL is to restore this impaired water body to its designated use - fishable waters. Mercury has been identified as the primary contaminant contributing to the current impairment of the Savannah River watershed for which fish consumption advisories have been established. Current information indicates that the main source of mercury loading to the watershed is derived from atmospheric deposition. - Taken from introduction. February 2001 - taken from PDF metadata. This is a US federal gov't document.