Ambient Water Quality Criteria for 
Dissolved Oxygen, Water Clarity and 
Chlorophyll a for the Chesapeake Bay 
and Its Tidal Tributaries: 
2008 Technical Support for Criteria 
Assessment Protocols Addendum 
September 2008 UBRARY OF congress 
U.S. Environmental Protection Agency 
Region III 
Chesapeake Bay Program Office 
Annapolis, Maryland 
and 
Region III 
Water Protection Division 
Philadelphia, Pennsylvania 
in coordination with 
Office of Water 
Office of Science and Technology 
Washington, D.C. 
and 
the states of 
Delaware, Maryland, New York, 
Pennsylvania, Virginia, and 
West Virginia and the District of Columbia 
