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RECORD OF DECISION (RODS) Sep 18, 2006  · PETN Pentaerythritol tetranitrate QAP Quality Assurance Plan QC Quality Control RAGS Risk Assessment Guidance for Superfund RAWP Remedial

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Text of RECORD OF DECISION (RODS) Sep 18, 2006  · PETN Pentaerythritol tetranitrate QAP Quality...

  • EPA/ROD/R2006040001476 2006

    EPA Superfund

    Record of Decision:

    ANNISTON ARMY DEPOT (SOUTHEAST INDUSTRIAL AREA) EPA ID: AL3210020027 OU 03 ANNISTON, AL 09/18/2006

  • FINAL RECORD OF DECISION

    FOR

    AMMUNITION STORAGE AREA ANNISTON ARMY DEPOT

    ANNISTON ARMY DEPOT ANNISTON, ALABAMA

    July 2006

  • Table of Contents

    TABLE OF CONTENTS

    1.0 THE DECLARATION 1-1 1.1 Site Name and Location 1-1 1.2 Statement of Basis and Purpose 1-1 1.3 Assessment of the Site 1-1 1.4 Description of Selected Remedies 1-1 1.5 Statutory Determinations 1-3 1.6 Data Certification Checklist 1-3 1.7 Authorizing Signatures 1-4

    2.0 THE DECISION SUMMARY 2-1 2.1 Site Name, Location, and Brief Description 2-1 2.2 Site History and Enforcement Activities 2-1 2.3 Community Participation 2-2 2.4 Scope and Role of Operable Unit or Response Action 2-3 2.5 Site Characteristics 2-3

    2.5.1 Environmental Setting 2-12 2.5.2 Nature and Extent of Contamination 2-12 2.5.3 Risk Assessment Conceptual Site Model 2-13

    2.6 Current and Potential Future Land and Resource Uses 2-13 2.7 Summary of Site Risks 2-16

    2.7.1 Summary of Human Health Risk Assessment 2-16 2.7.2 Summary of Ecological Risk Assessment 2-24 2.7.3 Basis for Action 2-31

    2.8 Remedial Action Objectives 2-31 2.9 Description of Alternatives 2-32

    2.9.1 Description of Remedy Alternatives and Components 2-31 2.9.2 Expected Outcomes of Each Alternative 2-36

    2.10 Comparative Analysis of Alternatives 2-36 2.10.1 Overall Protection of Human Health and the Environment 2-38 2.10.2 Compliance with ARARs 2-38 2.10.3 Long-term Effectiveness and Permanence 2-44 2.10.4 Reduction of Toxicity, Mobility. and Volume Through Treatment 2-44 2.10.5 Short-Term Effectiveness 2-45 2.10.6 Implementability 2-46 2.10.7 Cost 2-46 2.10.8 State Acceptance 2-47 2.10.9 Community Acceptance 2-48

    2.11 Principal Threat Wastes 2-48 2.12 Selected Remedy 2-48

    2.12.1 Summary of Rationale for the Selected Remedy 2-48 2.12.2 Description of the Selected Remedy 2-48 2.12.3 Cost Estimate for the Selected Remedy 2-49 2.12.4 Estimated Outcome for the Selected Remedy 2-56

    2.13 Statutory Determinations 2-57 2.13.1 Protection of Human Health and the Environment 2-57 2.13.2 Compliance with ARARs 2-57 2.13.3 Other Criteria, Advisories, or TBC Guidance for this Remedial Action 2-62 2.13.4 Cost- Effectiveness 2-62 2.13.5 Utilization of Permanent Solutions 2-62 2.13.6 Preference for Treatment as a Principal Element 2-62 2.13.7 Five- Year Review Requirements 2-63

    Record of Decision Final i July 2006 Anniston Army Depot

  • Table of Contents

    2.14 Documentation of Significant Changes from Preferred Alternative of Proposed Plan 2-63

    3.0 THE RESPONSIVENESS SUMMARY 3-1

    4.0 REFERENCES 4-1

    APPENDIX A SELECTION OF EXPOSURE PATHWAYS A-1

    APPENDIX B DETAILED COSTS B-1

    LIST OF FIGURES

    Figure 2-1 Location of Anniston Army Depot 2-4 Figure 2-2 Location of SWMUs Within the ANAD ASA 2-5 Figure 2-3 Conceptual Site Model for Human Receptors 2-14 Figure 2-4 Conceptual Site Model for Ecological Receptors 2-15 Figure 2-5 Areas Exceeding the Recommended Lead Cleanup Level (1,350 mg/kg) at

    SWMU 35 (Deactivation Furnace) 2-34 Figure 2-6 SWMU 5 (Sinkhole) Limits of Site Boundaries for Land Use Controls 2-50 Figure 2-7 SWMU 8 (Acid Disposal Pit) Limits of Site Boundaries for Land Use Controls 2-51 Figure 2-8 SWMU 10/11 (TNT Washout Facility) Limits of Site Boundaries for Land Use

    Controls 2-52 Figure 2-9 SWMU 27 (South TNT Burial Pit) Limits of Site Boundaries for Land Use

    Controls 2-53 Figure 2-10 SWMU 35 (Deactivation Furnace) Limits of Site Boundaries for Land Use

    Controls 2-54

    LIST OF TABLES

    Table 1-1 Remedies for the ASA SWMUs Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 1-2

    Table 1-2 Data Certification Checklist Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 1-3

    Table 2-1 Nature and Extent of Contamination and the Chemicals of Concern (COCs) at Six ASA SWMUs Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-6

    Table 2-2 Chemicals of Concern and Exposure Point Concentrations in Soil 2-17 Table 2-3 Chemicals of Concern and Exposure Point Concentrations in Groundwater 2-17 Table 2-4 Exposure Assumptions for the Human Health Risk Assessment 2-20 Table 2-5 Toxicity Values for Evaluation of Ingestion and Inhalation Pathways:

    Noncancer Effects 2-22 Table 2-6 Toxicity Values for Evaluation of Ingestion and Inhalation Pathways:

    Carcinogenic Effects 2-23 Table 2-7 Risk Characterization Summary for Residential Land Use Chemicals of

    Concern in Groundwater at SWMU 5 2-25 Table 2-8 Risk Characterization Summary for Residential Land Use Chemicals of

    Concern in Groundwater at SWMU 8 2-25 Table 2-9 Risk Characterization Summary for Residential Land Use Chemicals of

    Concern in Groundwater at SWMU 10 2-26 Table 2-10 Risk Characterization Summary for Residential Land Use Chemicals of

    Concern in Groundwater at SWMU 11 2-27 Table 2-11 Risk Characterization Summary for Residential Land Use Chemicals of

    Concern in Groundwater at SWMU 27 2-28

    Record of Decision Final ii July 2006 Anniston Army Depot

  • Table of Contents

    Table 2-12 Risk Characterization Summary for Residential Land Use Chemicals of Concern in Groundwater at SWMU 35 2-29

    Table 2-13 Risk Characterization Summary for Industrial Land Use Chemical of Concern in Soil SWMU 35 2-29

    Table 2-14 Media Areas and Volumes Exceeding Cleanup Levels, Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-33

    Table 2-15 Key Technologies in Final Alternatives Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-33

    Table 2-16 EPA Evaluation Criteria Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-37

    Table 2-17 Comparative Analysis of Remedial Alternatives for Soil Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-39

    Table 2-18 Comparative Analysis of Remedial Alternatives for Groundwater Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-41

    Table 2-19 Comparison of Capital and O& M Costs for the Final Soil Alternatives Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-47

    Table 2-20 Comparison of Capital and O& M Costs for the Final Groundwater Alternatives Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-47

    Table 2-21 Land-Use Control Performance Objectives for the Selected Remedies Anniston Army Depot, Ammunition Storage area, Anniston, Alabama 2-55

    Table 2-22 Expected Outcomes for the Selected Remedy Anniston Army Depot Ammunition Storage Area, Anniston, Alabama 2-56

    Table 2-23 Recommended Cleanup Level for Lead in Soil Anniston Army Depot Ammunition Storage Area, Anniston, Alabama 2-57

    Table 2-24 Recommended Groundwater Monitoring Benchmarks Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-58

    Table 2-25 ARARs and TBC Guidance for Remediation of SWMU 35 Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-59

    Table 2-26 Action-Specific ARARs and TBC Guidance for Remediation of the Groundwater Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama 2-61

    Table A-1 Selection of Exposure Pathways, Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama A-1

    Table B-1 Soil Alternative 3 - SWMU 35 Costs, Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama B-1

    Table B-2 Summary of Discounted and Non- Discounted Costs for Alternative 3 - Monitored Natural Attenuation ( New & Existing Well Network) and Land Use Controls Anniston Army Depot, Ammunition Storage Area, Anniston, Alabama B-4

    Record of Decision Final iii July 2006 Anniston Army Depot

  • Acronyms and Abbreviations

    ACRONYMS AND ABBREVIATIONS

    AL Alabama ADEM Alabama Department of Environmental Management ANAD Anniston Army Depot ARAR applicable or relevant and appropriate requirement ASA Ammunition Storage Area ASTM American Society for Testing and Materials (AWWSB) Anniston Water Works and Sewer Board BEHP bis(2-ethy1hexy) phthalate BERA Baseline Ecological Risk Assessment BTEX benzene, toluene, ethylbenzene, and xylenes CDC Centers for Disease Control CERCLA Comprehensive Environmental Response, Compensation, and Liability Act of 1980 CFR Code of Federal Regulations COC chemical of concern COPC chemical of potential concern CSF cancer slope factor CSM conceptual site model CTE Central Tendency Exposure CY cubic yard 1, l-DCE 1, 1-dichloroethene 1,2-DCE 1,2-dichloroethene DERA Defense Environmental Restoration Account DQO Data Quality Objective EPA U.S. Environmental Protection Agency EPC exposure point concentration ERA ecological risk assessment ESE Environmental Science and Engineering, Inc. FFA Federal Facilities Agreement FR Federal Register FS Feasibility Study Ft Foot HEAST Health Effects Assessment Summary Tables HI hazard index HHRGO human health remedial goal option HQ hazard quotient Hr Hour ID Identification IDW investigation-derived waste IRIS Integrated Risk Information System Kg Kilogram L/d liters per day LF linear foot LS lump sum LUC Land Use Control MCL Maximum contaminant level mg/kg milligrams per kilogram MNA Monitored natural attenuation NA not applicable NA/NFA No Action/No Further Action NCEA National Center for Envi

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