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PUBLIC HEALTH ASSESSMENT

SHARPE ARMY DEPOT
(a.k.a. DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN, CALIFORNIA--SHARPE)
LATHROP, SAN JOAQUIN COUNTY, CALIFORNIA
CERCLIS NO. CA8210020832

March 31, 1998

Prepared by:

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


TABLE OF CONTENTS

LIST OF TABLES

LIST OF FIGURES

LIST OF ABBREVIATIONS

SUMMARY

BACKGROUND

    Site Description and History
    Demographics
    Land Use and Natural Resources
    ATSDR Involvement
    Quality Assurance and Quality Control

EVALUATION OF ENVIRONMENTAL CONTAMINATION AND POTENTIAL EXPOSURE PATHWAYS

    Introduction
    Consumption of Contaminated Groundwater
    Dermal Contact With Surface Soil
    Inhalation of Soil Gas
    Consumption of Locally Grown Foods

COMMUNITY/PUBLIC HEALTH CONCERNS

CONCLUSIONS

PUBLIC HEALTH ACTION PLAN

PREPARERS OF REPORT

REFERENCES

TABLES

FIGURES

APPENDIX A: Comparison Values

APPENDIX B: Glossary

APPENDIX C: VOC Plume Descriptions

APPENDIX D: Estimated Exposures and Health Effects

APPENDIX E: Responses to Public Comments


LIST OF TABLES

Table 1: Operable Units

Table 2: Exposure Pathways

Table 3: Maximum Contaminant Concentrations in On-Site Groundwater

Table 4: Maximum Contaminant Concentrations in Off-Site Groundwater

Table 5: Contaminant Concentrations in On-Site Wells

Table 6: Contaminant Concentrations in Off-Site Private Wells

Table 7: Maximum Contaminant Concentrations in On-Site Surface Soil

Table 8: Contaminant Concentration Range in Off-Site Surface Soil

Table 9: Plant Uptake of Arsenic


LIST OF FIGURES

Figure 1: Area Map

Figure 2: Site Map

Figure 3: Map Depicting Demographic Statistics for Sharpe Army Depot

Figure 4: ATSDR's Exposure Evaluation Process

Figure 5: VOC Groundwater Plumes

Figure 6: North Balloon Area Potable Well Locations


LIST OF ACRONYMS AND ABBREVIATIONS

ATSDR Agency for Toxic Substances and Disease Registry
CA California
CDHS California Department of Health Services
CDTSC California Department of Toxic Substances Control
CERCLA Comprehensive Environmental Response, Compensation, and Liability Act (1980)
CPF cancer potency factor
CREG

cancer risk evaluation guide for 1 x 10-6 excess cancer risk

CRWQCB California Regional Water Quality Control Board
1,2-DCA 1,2-dichloroethane
DDD 1,1-dichloro-2,2-bis(p-chlorophenyl)-ethane
DDE 1,1-dichloro-2,2-bis(p-chlorophenyl)-ethylene
DDT 1,1,1-trichloro-2,2-bis(p-chlorophenyl)-ethane
DLA Defense Logistics Agency
EMEG environmental media evaluation guide
EPA U.S. Environmental Protection Agency
FS feasibility study
ISV in-situ volatilization
LPWD Lathrop Public Works Department
LOAEL lowest-observed-adverse-effect-level
LTHA EPA's lifetime health advisory
MCL EPA's maximum contaminant level
µg/dL microgram per deciliter
mg/kg milligram per kilogram
mg/kg/day milligram per kilogram per day
MRL ATSDR's minimal risk level
NA not analyzed
ND

not detected

NOAEL no-observed-adverse-effect-level
NPL National Priorities List
OUs operable units
PHA public health assessment
PRG

preliminary remediation guide

RfD EPA's reference dose
RMEG reference dose media evaluation guide
ROD Record of Decision
ppb parts per billion
ppm parts per million
PCE tetrachloroethylene
RI

remedial investigation

Sharpe Defense Distribution Region West Sharpe Army Depot
SSJIDC

South San Joaquin Irrigation Drainage Canal

TCE trichloroethylene
TRC technical review committee
USAEC

U.S. Army Environmental Center

UST

underground storage tank

VOC

volatile organic compound

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