ATSDR - PHA - Riverbank Army Ammunition Plant, Stanislaus County, California

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PUBLIC HEALTH ASSESSMENT

RIVERBANK ARMY AMMUNITION PLANT
STANISLAUS COUNTY, CALIFORNIA
CERCLIS NO. CA7210020759

September 30, 1997

Prepared by

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

TABLE OF CONTENTS

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

Introduction

Exposure Evaluation Outline and Summary

I. Evaluation of Possible Groundwater Exposure Pathways West of the Main Facility

Hydrogeology of the Main Facility

Sources of Groundwater Contamination

First Detection of Groundwater Contamination - Study Area

Assumptions Used For The Evaluation Of Past Groundwater Exposure Pathways -

Study Area

Time

Concentration and Extent of Contamination

Summary

A. Indeterminate Past Public Health Hazard

1. Past Crop Consumption

B. No Apparent Public Health Hazards

1. Current Crop Consumption

2. Current Livestock Consumption

3. Past Livestock Consumption

4. Past Drinking Water Consumption/Showering

C. No Public Health Hazard

1. Current Drinking Water Consumption

Future Actions

II. Exposures From Contamination at the E-P Ponds Area.

Contamination in the E-P Ponds

A. No Apparent Public Health Hazards

1. Current Exposure Via Possible Groundwater Discharge to the Stanislaus River

2. Past Sediment Contact With Contaminants in the E-P Ponds

QUALITY ASSURANCE AND QUALITY CONTROL

COMMUNITY HEALTH CONCERNS

HEALTH OUTCOME DATA

PUBLIC HEALTH ACTION PLAN

APPENDIX A
Abbreviations and Acronyms

APPENDIX B
Toxicological Evaluations

APPENDIX C
Analytical Results of Domestic Well Sampling in the Study Area 1985 - 1995

FOOTNOTES

LIST OF FIGURES

Figure 1: Site Location Map

Figure 2: Site Layout Map

Figure 3A: Study Area Domestic Well Locations

Figure 3B: Extent of Study Area Contaminant Plume 1985 to 1995

Figure 3C: Extent of Study Area Contaminant Plume 1985 to 1995

LIST OF TABLES

Table 1: Possible Exposure Situations

Table 2: Exposure Pathways from Groundwater Contamination in the Study Area, West of the Facility

Table 3: Exposures from Contamination at the E-P Ponds Area (1½ miles north of the main facility)

Next Section

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