Bucks and Axis Mobile County, Alabama August 2016 · PDF file Bucks and Axis Mobile County,...

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Transcript of Bucks and Axis Mobile County, Alabama August 2016 · PDF file Bucks and Axis Mobile County,...

  • Fourth Five-Year Review Report for

    Stauffer Chemical Company (Cold Creek Plant) and Stauffer Chemical Company (LeMoyne Plant)

    ALD095688875 and ALD008161 t 76

    Frankl in E. Hill , Director Superfund Division

    Bucks and Axis Mobile County, Alabama

    August 2016

    Uni ted States Environmental Protection Agency Region 4

    Atlanta, Georgia

    Date:

  • ii

    Fourth Five-Year Review Report

    for

    Stauffer Chemical Company (Cold Creek Plant) and

    Stauffer Chemical Company (LeMoyne Plant)

    Highway 43 N

    Bucks and Axis

    Mobile County, Alabama

    List of Acronyms ........................................................................................................................... v

    Executive Summary .................................................................................................................... vii

    Five-Year Review Summary Form ............................................................................................. ix

    1.0 Introduction ............................................................................................................................. 1

    2.0 Site Chronology ....................................................................................................................... 2

    3.0 Background ............................................................................................................................. 3

    3.1 PHYSICAL CHARACTERISTICS .......................................................................................... 3

    3.2 LAND AND RESOURCE USE .............................................................................................. 7 3.3 HISTORY OF CONTAMINATION ......................................................................................... 8 3.4 INITIAL RESPONSE ........................................................................................................... 8

    3.5 BASIS FOR TAKING ACTION ............................................................................................. 9

    4.0 Remedial Actions .................................................................................................................. 10

    4.1 REMEDY SELECTION ...................................................................................................... 10 4.2 REMEDY IMPLEMENTATION ........................................................................................... 15

    4.3 OPERATION AND MAINTENANCE (O&M) ....................................................................... 16

    5.0 Progress Since the Last Five-Year Review ......................................................................... 19

    6.0 Five-Year Review Process .................................................................................................... 21

    6.1 ADMINISTRATIVE COMPONENTS .................................................................................... 21

    6.2 COMMUNITY INVOLVEMENT .......................................................................................... 21 6.3 DOCUMENT REVIEW ...................................................................................................... 22 6.4 DATA REVIEW ............................................................................................................... 27

    6.5 SITES INSPECTION .......................................................................................................... 31 6.6 INTERVIEWS ................................................................................................................... 32

    7.0 Technical Assessment ........................................................................................................... 33

    7.1 QUESTION A: IS THE REMEDY FUNCTIONING AS INTENDED BY THE DECISION DOCUMENTS?

    ..................................................................................................................................... 33

    7.2 QUESTION B: ARE THE EXPOSURE ASSUMPTIONS, TOXICITY DATA, CLEANUP LEVELS AND REMEDIAL ACTION OBJECTIVES (RAOS) USED AT THE TIME OF REMEDY SELECTION STILL

    VALID? ......................................................................................................................... 34

    7.3 QUESTION C: HAS ANY OTHER INFORMATION COME TO LIGHT THAT COULD CALL INTO QUESTION THE PROTECTIVENESS OF THE REMEDY? ...................................................... 35

    7.4 TECHNICAL ASSESSMENT SUMMARY ................................................................................... 35

    8.0 Issues, Recommendations and Follow-up Actions ............................................................. 36

    9.0 Protectiveness Statements .................................................................................................... 37

  • iii

    10.0 Next Review ......................................................................................................................... 37

    Appendix A: List of Documents Reviewed ............................................................................. A-1

    Appendix B: Press Notice ......................................................................................................... B-1

    Appendix C: Interview Forms ................................................................................................. C-1

    Appendix D: Site Inspection Checklist ................................................................................... D-1

    Appendix E: Photographs from Sites Inspection Visit .......................................................... E-1

    Appendix F: Detailed Groundwater and Soil Data Evaluation ............................................. F-1

    Appendix G: Contaminant Groundwater Plume Maps ........................................................ G-1

    Appendix H: Risk Evaluation of Groundwater and Soil Cleanup Goals ............................ H-1

    Tables

    Table 1: Chronology of Site Events ............................................................................................... 2

    Table 2: OU1 Groundwater Cleanup Goals for the LP Site and the CCP Site ............................ 11 Table 3: LP OU2 Soil Cleanup Goals .......................................................................................... 12

    Table 4: CCP OU2 Sub-surface Soil Cleanup Goals for the Old Neutralization Pond ............... 13 Table 5: LP and CCP OU3 Cleanup Goals for Mercury ............................................................. 14 Table 6: Annual O&M Costs ....................................................................................................... 19

    Table 7: Progress on Recommendations from the 2011 FYR ..................................................... 20 Table 8: OU1 ARARs Evaluation for Groundwater COCs for the LP Site and the CCP Site .... 23

    Table 9: Deed Documents from the Mobile County Probate Court Office ................................. 24 Table 10: Institutional Control (IC) Summary ............................................................................. 24 Table 11: CCP OU2 Summary of Thiocarbamate Exceedances ................................................. 30

    Table 12: Evaluation of CCP OU2 2016 Biopile Soil Sample Results ....................................... 31

    Table 13: Issues and Recommendations Identified in the FYR ................................................... 36 Table 14: Protectiveness Statements ............................................................................................ 37 Table F-1: Monthly Groundwater Monitoring Data for Molinate at the CCP Site ................... F-3

    Table F-2: Summary of LP OU2 Groundwater Data ................................................................. F-4 Table F-3: Summary of LP OU2 former Halby Groundwater Monitoring Data ....................... F-6

    Table F-4: Summary of December 2015 LP OU2 former Halby Soil Data .............................. F-7 Table F-5: Summary of Thiocarbamate Exceedances in CCP OU2 .......................................... F-8

    Table H-1: Risk Evaluation of LP and CCP OU1 Groundwater Cleanup Goals....................... H-1 Table H-2: Risk Evaluation of 2012 CCP OU2 Soil Performance Standards ........................... H-1

    Figures Figure 1: Site Location Map .......................................................................................................... 4

    Figure 2: LP Site – Detailed Site Map ........................................................................................... 5 Figure 3: CCP Site – Detailed Site Map ........................................................................................ 6

    Figure 4: Site Institutional Controls Map .................................................................................... 26 Figure 5: Summary of Wells Monitored for Remedy Performance at the LeMoyne Plant ......... 28 Figure 6: Thiocyanate Concentration Trend in IW-5 in the LP OU2 former Halby Pond .......... 29 Figure F-1: Carbon Tetrachloride Concentration Trend in MW-19 near the LP GWIP ........... F-1 Figure F-2: Thiocyanate Concentration Trend in IW-5 in the LP OU2 former Halby Pond ..... F-5 Figure F-3: Thiocarbamate Concentrations in MW-16 (ONP) at CCP OU2............................. F-9 Figure F-4: Molinate Concentration Trends at CCP OU2 ......................................................... F-9

  • iv

    Figure F-5: Thiocarbamate Concen