Record of Decision ICRR Johnston '{ard Sile September 20 I 0 RECORD OF DECISION SUMMARY OF REMEDIAL ALTERNATIVE SELECTION ILLINOIS CENTRAL JOHNSTON YARD SITE MEMPHIS, TN PREPARED BY: U.S. ENVIRONl\IENT AL PROTECTION AGENCY REGION 4 ATLANT A, GEORGIA September 2010 11111111111111111111111111111111111111111111111111 10746644 Record of Decision (eRR Johnston Yard Site Septemher 20 (0 Table of Contents LIST OF ACRONYMS and ABBREVIAnONS PART 1: THE DECLARATION ..................................................................................................... i 1.1 Site Narne and Location ....................................................................................................... i 1.2 Statement of Basis and Purpose ........................................................................................... i 1.3 Assessment of Site ............................................................................................................... i 1.4 Description of Selected Remedy......................................................................................... ii 1.5 Statutory Determinations .................................................................................................... ii 1.6. Data Celtification Checklist. .............................................................................................. iii 1.7. Authorizing Signature ....................................................................................................... iii PART 2: THE DECISION SUMMARY ......................................................................................... 1 2.1 Site Name. Location. and Brief Description ........................................................................ 1 2.2 Site History and Enforcement Activities ............................................................................. 1 2.2.1 Previous Investigations and CERCLA Actions .......................................................3 2.3 C01l1n1unity Participation .....................................................................................................4 2.4 Scope and Role of Operable Unit or Response Action ....................................................... .4 2.5 Site C.haracteristics ...............................................................................................................5 2.5.1 Conceptual Site Models ...........................................................................................5 2.5.2 Site Overview ...........................................................................................................5 2.5.3 Surface and Subsurface Features .............................................................................6 2.5.4 Sarnpling Strategy ....................................................................................................8 2.5.5 Known and/or Suspected Sources of Contamination...............................................9 2.5.6 Types of Contamination and Affected Media ..........................................................9 2.5.6.1 Soil ............................................................................................................9 2.5.6.2 Groundwater ............................................................................................. 10 2.5.6.3 Sedirl1ent ................................................................................................. 11 2.5.6.4 Surface Water. ........................................................................................... 11 2.5;7 Extent of Contamination and Potential for Migration ........................................... 11 2.6 Current and Potential Future Land and Water Uses .......................................................... 12 2.7 Sun1n1ary of Site Risks ....................................................................................................... 13 2.7.1 Summary of Human Health Risk Assessment.. ..................................................... 13 2.7.1.1 Identi fication of Chemicals of Concem ..................................................... 13 2.7.1.2 Exposure Assessment.. ............................................................................... 14 2.7.1.3 Toxicity Assessment .................................................................................. 15 2.7.1.4 Risk Characterization ..............................- ................................................... 15 2.7.1.5 Unceltainties .............................................................................................. 16 2.7.2 Summary of Ecological Risk Assessment ........................................................... :.18 2.7.2.1 Environmental Setting .............................................................................. 18 2.7.2.2 Results of Screening Level Ecological Risk Assessment.. ........................ 19 2.7.3 Basis for Action .....................................................................................................20 2.8 Remedial Action Objectives ..............................................................................................21 2.9 Description of Altematives ................................................................................................22 2.9.1 Description of Remedy Components .................................................. , .................. 22 Record of Decision leRR Johnston 'ianj Site September 20 I I) 2.9.2 Common Elements and Distinguishing Features of Each Altell1ative ...................25 2.9.3 Expected Outcomes of Each Altell1ative ...............................................................25 2.10 Comparative Analysis of Alternatives ...............................................................................26 2.l0.1 Overall Protection. of Human Health and the Environment.. ................................. 26 2.10.2 Compliance with Applicable or Relevant and Appropriate Requirements ............27 2.10.3 Long-Term Effectiveness and Permanence ...........................................................27 2.10.4 Reduction of Toxicity, Mobility, or Volume Through Treatment.. ....................... 28 2.10.5 Short-Term Effectiveness ......................................................................................29 2.10.6 Implementabil ity ....................................................................................................29 2.10.7 Cost ....................................................................................................................30 2.10.8 State/Support Agency Acceptance .........................................................................30 2.10.9 Community Acceptance .........................................................................................30 2.11 Principal Threat Wastes .....................................................................................................30 2.12 Selected Rernedy ................................................................................................................30 2.12.1 Summary of the Rationale for the Selected Remedy .............................................30 2.12.2 Description of the Selected Remedy ......................................................................31 2.12.3 Summary of the Estimated Remedy Costs .............................................................33 2.12.4 Expected Outcomes of the Selected Remedy ........................................................33 2.12.4.1 Available Use after Clean-up .........................................................33 2.12.4.2 Final Clean-up Levels ....................................................................33 2.12.4.3 Anticipated Environmental and Ecological Benefits .....................34 2.13 Statutory Determinations ...................................................................................................34 2.13.1 Protection of Human Health and the Environment.. .............................................. 34 2.13.2 Compliance with Applicable or Relevant and Appropriate Requirements ............34 2.13.3 Cost Effectiveness ..................................................................................................34 2.13.4 Utilization of Permanent Solutions and Altell1ative Treatment (or Resource Recovery) Technologies to the Maximum Extent Practicable .... :......................... 35 2.13.5 Preference for Treatment as a Principal Element ..................................................35 2.13.6 Five-Year Requirements ........................................................................................35 2.14 Documentation of Significant Changes from Preferred Alternative of Proposed Plan .....36 PART 3: RESPONSIVENESS SUMMARY. ................................................................................36 FIGURES Figure 1 - Site Location Map Figure 2 - Extent of LNAP Plumes Figure 3 - Estimated Area of Historic Diesel Impacts in Soil Related to Fluvial Aquifer LNAPL TABLES Table I - Conceptual Site Model (Human Receptors) Table 2 - Groundwater Contaminants Exceeding Groundwater Water Standards Table 3 - Site Wide Summary of Carcinogenic Risks and Non-Carcinogenic Hazards Table 4 - Classification Yard Soils Summary of Carcinogenic Risks and Non-Carcinogenic Hazards Table 5 - Cost Comparison for Alternatives Record of Decision ICRR Johnston Yard Sitl: September 20 I 0 . Table 6 - Detailed Cost Estimate of Selected Remedy Table 7 - Final Cleanup Levels Table 8 - Chemical Specific ARARs Table 9 - Summary of Action Specific ARAR Provisions Appendix A: RISK ASSESSMENT