Contents 
Foreword. vii 
Executive Summary. ix 
Notices.xix 
Acknowledgments .xxi 
I. Introduction . 1 
National Criteria . 2 
Regional Nutrient Criteria. 2 
Chesapeake Bay Criteria. 3 
II. Chesapeake Bay Nutrient and Sediment Enrichment Criteria ... 5 
III. Dissolved Oxygen Criteria. 7 
Background . 7 
Chesapeake Bay science . 7 
Natural dissolved oxygen processes . 8 
Chesapeake Bay oxygen dynamics . 8 
Low dissolved oxygen: historical and recent past. 10 
Approach to Deriving Dissolved Oxygen Criteria. 12 
Chesapeake Bay dissolved oxygen restoration goal framework .... 14 
Regionalizing the EPA Virginian Province 
saltwater dissolved oxygen criteria . 15 
Applying the EPA freshwater dissolved oxygen criteria. 25 
Species listed as threatened or endangered. 27 
Scientific literature findings. 33 
Instantaneous minimum versus daily mean. 33 
Strengths and limitations of the criteria derivation procedures. 34 
Chesapeake Bay Dissolved Oxygen Criteria Derivation . 40 
Migratory fish spawning and nursery designated use criteria. 42 
Open-water fish and shellfish designated use criteria. 46 
Deep-water seasonal fish and shellfish designated use criteria. 52 
Deep-channel seasonal refuge designated use criteria. 60 
Library of Congress 
