PUBLIC HEALTH ASSESSMENT

Select PCB Exposure Pathways

AGANA POWER PLANT
MONGMONG, GUAM
EPA FACILITY ID: GUSFN0905568

September 30, 2003

Prepared by:

Federal Facilities Assessment Branch
Division of Health Assessment and Consultation
Agency for Toxic Substances and Disease Registry

TABLE OF CONTENTS

SUMMARY

INTRODUCTION

BACKGROUND

A. Agana Power Plant and Surrounding Areas
B. Agana Power Plant Use and History of PCB Environmental Contamination
C. ATSDR Involvement at the Agana Power Plant
D. Demographics
E. Land Use and Natural Resource Use
F. Quality Assurance and Quality Control

EVALUATION OF ENVIRONMENTAL CONTAMINATION, EXPOSURE PATHWAYS, AND PUBLIC HEALTH IMPLICATIONS

A. Eating Foods from the Agana Swamp and River
B. Playing in the Dirt or Runoff Ditches and Gardening
C. Swimming and Wading in Agana Swamp and River

COMMUNITY CONCERNS

ATSDR's CHILD HEALTH CONCERNS

CONCLUSIONS

PUBLIC HEALTH ACTION PLAN

PREPARERS OF THE REPORT

REFERENCES

FIGURES

Figure 1: Site Location Agana Power Plant
Figure 2: Agana Power Plant Drainage Areas

APPENDICES

Appendix A: Possible Exposure Situations for PCBs From the Agana Power Plant
Appendix B: ATSDR Hazard Categories
Appendix C: Calculation of Total Dioxins as 2,3,7,8-TCDD TEQ
Appendix D: Information on How ATSDR Assesses Exposure
Appendix E: Exposure Evaluation Methodology and Assumptions
Appendix F: Frequently Discussed Health Effects from PCB Exposures
Appendix G: Reported Health Conditions in Mongmong Residents
Appendix H: Acronyms and Glossary
Appendix I: Exposure Pathways Table
Appendix J: PCB Information Sheets
Appendix K: ATSDR's Responses to Public Comments

LIST OF TABLES

Table 1. Sampling Conducted in Agana Swamp, River, and Harbor

Table 2. Total PCBs Sampled in Fish, Eels, and Snails in Agana Swamp and River*

Table 3. Total Dioxins Sampled in Fish, Eels, and Snails in Agana Swamp and River*

Table 4. PCB Residues Detected in Domestic Foods

Table 5. Estimated Number of Fish, Eels, and Snails Meals without Exceeding USEPA's Reference Dose

Table 6. Total Dioxin Residues Detected in Domestic Foods

Table 7. Estimated Dioxin Exposure Doses from Eating Fish, Eels and Snails from the Agana Swamp and River

Table C-1: Total Equivalency Factors (TEFs) for Dioxins, Furans, and PCB-like Congeners

Table E-1: Fish, Eels, and Snails Exposure Dose Assumptions

Table E-2. Estimated PCB Exposure Dose Levels from Eating Fish, Eels, and Snails from the Agana Swamp and River Non-cancer effects

Table E-3: Soil Exposure Dose Assumptions

Table E-4. Estimated PCB Exposure Dose Levels from Accidentally Ingesting Soil While Gardening or Playing - Non-cancer effects

Table I-1: Exposure Situation and Hazard Summary Table - Mongmong Community and Agana Power Plant, Guam

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