Guidance for Conducting Risk Assessments and Related Risk

6,29

MB

Activities for the DOE-ORO Environmental Management Program

232

stron

4911

ID

University of Tennessee

1999

rok

CONTENTS

TABLES v

FIGURES.v

ACRONYMS.vii

EXECUTIVE SUMMARY.ix

1. INTRODUCTION1

1.1 PURPOSE AND SCOPE .2

1.2 AUDIENCE3

1.3 IMPLEMENTATION.3

1.4 ROLES AND RESPONSIBILTIES4

1.5 DOCUMENT ORGANIZATION.4

2. ENVIRONMENTAL RESTORATION .6

2.1 PROJECT RISK RANKING9

2.2 IMPLEMENTING THE RI/FS PROCESS .10

2.2.1 Site Evaluations12

2.2.2 Remedial Investigation 13

2.2.3 Feasibility Study14

2.2.4 Deletion and Five Year Review .15

3. OTHER ENVIRONMENTAL MANAGEMENT ACTIVITIES.17

3.1 WASTE MANAGEMENT.17

3.2 DECONTAMINATION & DECOMMISSIONING17

3.3 TECHNOLOGY DEVELOPMENT AND DEMONSTRATION19

3.4 REINDUSTRIALIZATION.19

4. RISK ASSESSMENT IMPLEMENTATION.20

4.1 DATA EVALUATION21

4.2 EXPOSURE ASSESSMENT.23

4.2.1 Characterization of the Exposure Setting: Land Use.24

4.2.2 Identification of Exposure Pathways 25

4.2.3 Quantification of Exposure 26

4.3 TOXICITY ASSESSMENT.26

4.3.1 Toxicity Values .26

4.3.2 Toxicity Profiles27

4.4 RISK CHARACTERIZATION27

4.4.1 Selecting Scenarios, Pathways, and Chemicals of Concern (COCs)28

4.4.2 Verification of Calculations .29

4.4.3 Presenting the Risk Characterization Results .29

4.5 UNCERTAINTY ANALYSIS .29

5. SCREENING RISK ASSESSMENTS .30

5.1 COMPARISON TO RISK-BASED PRELIMINARY REMEDIATION GOALS30

5.1.1 Risk-Based Preliminary Remediation Goal Screening to Determine Chemicals of Potential

Concern in the Baseline Human Health Risk Assessment.31

5.1.2 Risk-Based Preliminary Remediation Goal Screening to Support Characterization Activities .31

5.1.3 Risk-Based Preliminary Remediation Goal Comparison for Identifying High Priority On-site

Areas31

5.2 INTEGRATION POINT ASSESSMENTS.32

6. BASELINE HUMAN HEALTH RISK ASSESSMENTS.33

7. RISK ASSESSMENT IN AND AFTER THE FEASIBILITY STUDY.34

8. RISK ASSESSMENT INFORMATION SYSTEM 36

9. REFERENCES.38

APPENDIX A A-1

APPENDIX B B-1

APPENDIX C C-1

APPENDIX D D-1

APPENDIX E. E-1

APPENDIX F. F-1

APPENDIX G G-1

APPENDIX H H-1

APPENDIX I. I-1