Codorus Creek Watershed: A Regional Ecological Risk Assessment with Field Confirmation of the Risk Patterns

Introduction............................................................................................................120 Regional Risk Assessment and the Relative Risk Model (RRM) ...................120

Part I: The Codorus Creek Watershed and the Regional Risk Assessment .........121 The Codorus Creek Watershed .........................................................................121 Conceptual Site Model .....................................................................................122 Overall Risk Ranks ...........................................................................................123

Part II: Verification of Relative Risk Classifications ............................................124 Biological Datasets ...........................................................................................125 Data Analysis ....................................................................................................127 Index of Biotic Integrity (IBI)..........................................................................128 Uncertainties .....................................................................................................129 Summary of Verification Results......................................................................130