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PUBLIC HEALTH ASSESSMENT

AIR AND GROUNDWATER PATHWAYS ANALYSES
AGANA POWER PLANT
MONGMONG, GUAM

September 22, 2004

Prepared by:

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




TABLE OF CONTENTS

Foreword

Summary

Introduction

Background Evaluation of Environmental Contamination, Exposure Pathways, and Public Health Implications Community Concerns ATSDR's Child Health Considerations

Conclusions Recommendations

Public Health Action Plan Preparers of the Report

References

Appendices

Appendix A: Possible Exposure Situations for PCBs From the Agana Power Plant

Appendix B: ATSDR Hazard Categories

Appendix C: Information on How ATSDR Assesses Exposure

Appendix D: Exposure Evaluation Methodology and Assumptions

Appendix E: ATSDR Glossary of Terms

Appendix F: Other Potential Sources of Pollution in the Mongmong Area

Appendix G: Reducing inhalation exposure during swamp fires.

Appendix H: Difference Between ATSDR's public health assessment process and EPA's risk assessment process.

Appendix I: Additional Information Regarding the Potential Health Effects Associated with Dioxins and PCBs

Appendix J: Response to Public Comments

List of Tables

Table 1. Summary of VOCs, PCBs1, and Pesticides Detected in Drinking Water From GWA Supply Wells Within 1 Mile of APP

Table 2. APP Surface and Subsurface Soil Data-Offsite Locations

Table 3. PCB (Aroclors) Sampled in Fish, Eels, and Snails in Agana Swamp and River

Table 4. Estimated (Modeled) PCB Concentrations in Animals in Sampling Locations Based on Historical PCB Levels Detected in Soils near APP

Table 5. PCB Residues Detected in Domestic Foods

Table 6. PM10 Ambient Air Monitoring Data from Guam (1989-1991)

Table D-1. Estimated Concentrations in Meat, Dairy, and Eggs of Free-Ranging Animals Based on Detected Soil Concentrations

Table D-2. Exposure Dose Assumptions

Table D-3. Estimated PCB Exposure Dose Levels From Eating: Non-cancer Effects

List of Figures

Figure 1: Site Location, Agana Power Plant

Figure 2: Agana Power Plant Surface Geology

Figure 3: Agana Power Plant Surface Soils

Figure 4: Agana Power Plant Drainage Areas

Figure 5: Locations of Drinking Water Supply Wells Within a One-Mile Radius of Agana Power Plant

Figure 6a: Elevation Map Locations

Figure 6b: Elevation Map

Figure 7: 1945 Military Areas Near Agana Power Plant

Figure 8: Selected Former Ambient Air Monitoring Locations on Guam

Figure 9: Agana Swamp Wetlands Map

LIST OF ABBREVIATIONS

AIRS Aerometric Information Retrieval System
APP Agana Power Plant
ATSDR Agency for Toxic Substances and Disease Registry
bgs below ground surface
BTF biotransfer factor
CAIS chemical agent identification set
CERCLIS Comprehensive Environmental Response, Compensation, and Liability Information System
CV ATSDR's comparison value
DAWR Division of Aquatic and Wildlife Resources
EMEG environmental media evaluation guide
EPA United States Environmental Protection Agency
FDA United States Food and Drug Administration
FUDS formerly used defense sites
GDPHSS Guam Department of Public Health and Social Services
GEPA Guam Environmental Protection Agency
GWA Guam Waterworks Authority
LOAEL lowest observed adverse effect level
mg/kg milligram per kilogram
mg/kg/day milligram per kilogram per day
MCL maximum contaminant level
MRL ATSDR's minimal risk level
NAS Naval Air Station
NPL National Priorities List
PAH polycyclic aromatic hydrocarbons
PCBs polychlorinated biphenyls
PCDDs polychlorinated dibenzo-p-dioxins
PCDFs polychlorinated dibenzofurans
PCE tetrachloroethylene
PHA public health assessment
PM10 particulate matter smaller than 10 microns
ppb parts per billion
ppm parts per million
POI point of interest
RBC EPA's risk-based concentration
RfD reference dose
SDWSs safe drinking water standards
SVOCs semi-volatile organic compounds
TCE trichloroethylene
TPH total petroleum hydrocarbons
TSP total suspended particulates
USACE United States Army Corps of Engineers
UXO unexploded ordnance
VOCs volatile organic compounds
WERI Water and Environmental Research Institute of the Western Pacific


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