Modeling Approach . 84 
Analysis issues . 84 
Literature Cited. 88 
VIII. Framework for Chesapeake Bay Tidal Waters 303(d) 
List Decision-making . 89 
Background. 89 
Listing Category Decisions. 89 
Criteria attainment assessments . 90 
Dissolved oxygen criteria attainment assessments . 90 
Water clarity criteria attainment assessments . 91 
Chlorophyll a criteria attainment assessments . 91 
Benthic index of biotic integrity assessments . 92 
Assessment reporting framework . 92 
Listing Decision Framework . 95 
Segments previously listed as impaired . 96 
Segments not previously listed as impaired . 96 
Shallow-water designated use listing decisions . 96 
Literature Cited. 97 
Acronyms . 98 
Appendices 
A. The Cumulative Frequency Diagram Method for Determining Water 
Quality Attainment: Report of the Chesapeake Bay Program 
STAC Panel to Review Chesapeake Bay Program Analytical Tools . A-l 
B. Detailed Chesapeake Bay Water Quality Criteria Assessment 
Methodology .B-l 
C. Evaluation of Options for Spatial Interpolation .C-l 
D. User Guide and Documentation for the 
Chesapeake Bay Interpolator . D-l 
E. Potential Methods for Assessing Shorter Duration 
Dissolved Oxygen Criteria.E-l 
F. Data Used in Deriving the Open-Water, Deep-Water, and 
Deep-Channel Dissolved Oxygen Criteria Summer Biological 
Reference Curves .F-l 
G. Equations for the Open-Water, Deep-Water, and Deep-Channel 
Dissolved Oxygen Criteria Summer Biological Reference Curves . . G-l 
H. Equations for the Water Clarity Criteria Biological Reference 
Curves .H-l 
I. Evaluation of Maryland and Virginia Chesapeake Bay Segment SAV 
Acreages from 2003 to 2005 for Prioritizing Shallow-Water Monitoring 
by Segment . 1-1 
