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HEALTH CONSULTATION

Air Pathway Evaluation

SIERRA ARMY DEPOT
HERLONG, LASSEN COUNTY, CALIFORNIA
EPA FACILITY ID: CA5210020843

November 7, 2003

Prepared by:

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


TABLE OF CONTENTS

LIST OF TABLES

LIST OF FIGURES

LIST OF ABBREVIATIONS

I. SUMMARY

II. INTRODUCTION

III. BACKGROUND

IV. EXPOSURE PATHWAY ANALYSIS

V. EVALUATION OF AIR EXPOSURES

VI. EVALUATION OF CANCER CASES

VII. COMMUNITY HEALTH CONCERNS

VIII. CHILD HEALTH CONSIDERATIONS

IX. CONCLUSIONS

X. RECOMMENDATIONS

XI. PUBLIC HEALTH ACTION PLAN

XII. PREPARERS OF REPORT

XIII. REFERENCES

APPENDIX A: ATSDR COMPARISON VALUES

APPENDIX B: GLOSSARY OF TERMS

APPENDIX C: REVIEW OF AIR SAMPLING STUDIES

APPENDIX D: REVIEW OF AIR MODELING STUDIES


LIST OF TABLES

Table 1. Contaminants with More Than 10 Pounds of Air Emissions Per Year from SIAD's OB/OD Operations

Table 2. Emissions Data SIAD Reported to EPA's Toxic Release Inventory

Table 3. Estimated Ambient Air Concentrations of Metals and Inorganic Compounds

Table 4. Estimated Ambient Air Concentrations of Explosives, Propellants, and Fillers

Table 5. Estimated Ambient Air Concentrations of OB/OD Chemical By-Products

Table C-1. Detection Limits for the 2000 Air Sampling Study at SIAD

Table C-2. Frequencies with which Elements Were Detected during the 2000 Air Sampling Study at SIAD

Table C-3. PM10 Concentrations Measured in Susanville, California


LIST OF FIGURES

Figure 1. Location of Sierra Army Depot

Figure 2. Immediate Vicinity of Sierra Army Depot

Figure 3. Wind Rose for Meteorological Data Collected at the Incinerator in 1996

Figure 4. Wind Rose for Meteorological Data Collected at the OB/OD Break Shack

Figure 5. Annual Amount of Waste Material Treated at SIAD, by Fiscal Year

Figure 6. Pollutants Released to the Environment after Open Detonation of Explosive Materials

Figure 7. Influence of Forest Fires on Average PM10 Concentrations in Residential Areas

Figure C-1. Average PM10 Concentrations Measured during the 2000 Sampling Program


LIST OF ABBREVIATIONS

AIRS

Aerometric Information Retrieval System
ATSDR Agency for Toxic Substances and Disease Registry
BLM Bureau of Land Management
CARB California Air Resources Board
CCR California Cancer Registry
CDC Centers for Disease Control and Prevention
CREG Cancer Risk Evaluation Guide (see Appendix A)
CRNC Cancer Registry of Northern California
DTSC California Department of Toxic Substances and Control
EMEG Environmental Media Evaluation Guide (see Appendix A)

EPA

U.S. Environmental Protection Agency
HMX cyclotetramethylenetetranitramine
NAAQS National Ambient Air Quality Standard (see Appendix A)
NCCR Nevada Central Cancer Registry
NEW net explosive weight
NSHD Nevada State Health Division
OB open burning
OD open detonation

PETN

pentaerythritol tetranitrate
PM particulate matter
PM10 particulate matter smaller than 10 microns
PRG preliminary remediation goal (see Appendix A)
RBC Risk-based Concentration (see Appendix A)
RDX cyclotrimethylenetrinitramine
REL Recommended Exposure Level (see Appendix A)
RfC Reference Concentration (see Appendix A)

RPD

relative percent difference
SIAD Sierra Army Depot
TRI Toxic Release Inventory
TSP total suspended particulates
UCL upper confidence limit
WSA Wilderness Study Area
XRF X-Ray Fluorescence

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