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FINDINGS 
For the majority of Chesapeake Bay Program segments and the designated use habi¬ 
tats within those segments identified in Table V-9, dissolved oxygen concentration 
data collected through monthly to twice monthly sampling at the Chesapeake Bay 
Water Quality Monitoring Program fixed-stations can be used to assess attainment 
of all higher frequency dissolved oxygen criteria components including the 7-day 
mean, 1-day mean and instantaneous minimum criteria. For the remaining segments 
and identified designated uses, further targeted buoys deployments are required to 
more fully characterize and quantify the relationships between the monthly mean, 7- 
day mean, 1-day mean and instantaneous minimum concentrations. Further work is 
underway to factor in additional variables to strengthen the predictive relationships 
between the 30-day mean, 7-day mean, 1-day mean and instantaneous minimum 
values and therefore, the assessment of attainment of the instantaneous minimum, 1- 
day mean and 7-day mean criteria using monthly mean observations. 
LITERATURE CITED 
Jordan, S.J., C. Stenger, M. Olson, R. Batiuk and K. Mountford. 1992. Chesapeake Bay 
Dissolved Oxygen Goal for Restoration of Living Resource Habitats: A Synthesis of Living 
Resource Requirements with Guidelines for Their Use in Evaluating Model Results and 
Monitoring Information. CBP/TRS 88/93. Region III Chesapeake Bay Program Office, 
Annapolis, Maryland. 
U.S. Environmental Protection Agency. 2003. Ambient Water Quality • Criteria for Dissolved 
Oxygen. Water Clarity' and Chlorophyll a for the Chesapeake Bay and Its Tidal Tributaries. 
EPA 903-R-03-002. Region III Chesapeake Bay Program Office, Annapolis, Maryland. 
chapter v 
Guidance for Attainment Assessment of Instantaneous Minimum and 7-Day Mean Dissolved Oxygen Criteria 
