IV 
Assessment of 7-Day Mean Criteria Attainment 
from Monthly Mean Data Findings. 64 
Findings . 66 
Literature Cited . 66 
VI. Guidance for Deriving Site Specific Dissolved Oxygen Criteria 
for and Assessing Criteria Attainment of Naturally Low 
Dissolved Oxygen Concentrations in Tidal Wetland 
Influenced Estuarine Systems . 67 
Natural Conditions/Features Indicating Role of 
Wetlands in Low Dissolved Oxygen Concentrations . 68 
Surface to volume ratios/large fringing wetland areas . 68 
Water quality conditions . 68 
Dissolved oxygen/temperature relationships . \. 71 
Low variability in dissolved oxygen concentrations. 71 
Approaches for Addressing Naturally Low Dissolved Oxygen 
Conditions Due to Tidal Wetlands . 73 
Derivation of Site-Specific Dissolved Oxygen Criteria Factoring 
in Natural Wetland-Caused Dissolved Oxygen Deficits . 76 
Scientific research-based estimates of wetland respiration .... 77 
Model-based wetland-caused oxygen deficits. 77 
Monitoring-based estimates of wetland-caused oxygen deficits 78 
Site-specific dissolved oxygen criteria derivation. 81 
Site-specific criteria biological reference curve . 82 
Literature Cited . 83 
VII. Upper and Lower Pycnocline Boundary Delineation 
Methodology . 85 
Determination of the Vertical Density Profile . 86 
Determination of the Pycnocline Depths. 86 
Literature Cited . 87 
VIII. Updated Guidance for Application of Water Clarity Criteria 
and SAV Restoration Goal Acreages . 89 
Water Clarity Criteria Application Periods . 90 
Shallow-w ater Habitat Acreages. 91 
SAV restoration acreage to shallow-water habitat acreage ratio 91 
SAV Restoration Goal Acreages. 92 
Determining Attainment of the Shallow-w ater Bay Grass Use . . 93 
Literature Cited . 94 
IX. Determining Where Numerical Chlorophyll a Criteria 
Should Apply to Local Chesapeake Bay and 
Tidal Tributary Waters . 87 
Recommended Methodology . 97 
Literature Cited . 99 
Appendix A: Wetland Area, Segment Perimenter/Area/Volume 
and Water Quality Parameter Statistics for Chesapeake Bay 
Tidal Fresh and Oligohaline Segments . 101 
Contents 
