Library ft * Concuss 
Ambient Water Quality Criteria 
for Dissolved Oxygen, Water Clarity 
and Chlorophyll a for the Chesapeake Bay 
and Its Tidal Tributaries 
2007 Addendum 
July 2007 
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 
•* W 
