Excerpts from Screening Level
Ecological Risk Assessment for Nahant Marsh, Davenport, Iowa

by Mike Coffey
U.S. Fish and Wildlife Service
DRAFT FINAL REPORT - April 14, 1998

prepared for
U.S. Environmental Protection Agency, Region VII
Under Interagency Agreement Number 92220-1910-37YC

Disclaimer and Announcement

Table of Contents

Introduction

Site History

Site Visit

Dead Bird Search Results Marsh Substrate Quality Marsh Ecology

Step One: Problem Formulation, Assessment Endpoints and Toxicity Evaluation

Problem Formulation Tentative Receptors and Assessment Endpoints Toxicity Evaluation

Step Two: Screening Level Exposure Estimates and Risk Calculations

Exposure Estimates Risk Calculations Uncertainty Analysis

Conclusions

References

List of Tables

Table 1. Summary of Waterfowl Necropsy Findings Table 2. Exposure Estimates for the Food Chain Pathway Table 3. Exposure Estimates for the Soil Ingestion Pathway Table 4. Screening Level Risk Hazard Quotients Table 5. Polycyclic Aromatic Hydrocarbon Risk Factors

Figure 1, Figure 2, Figure 3

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