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Fifth Five Year Review Report for Sydney Mine Sludge

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Fifth Five Year Review Report for Sydney Mine Sludge FIFTH FIVE-YEAR REVIEW REPORT FOR SYDNEY MINE SLUDGE PONDS SUPERFUND SITE HILLSBOROUGH COUNTY, FLORIDA MARCH 2021 Prepared by U.S. Environmental Protection Agency Region 4 Atlanta, Georgia Digitally signed by RANDALL RANDALL CHAFFINS Date: 2021.04.13 CHAFFINS 4/13/21 ---------------------------------11:31:36 -04'00' ----------------------------------- Randall Chaffins, Acting Director Date Superfund & Emergency Management Division Table of Contents LIST OF ABBREVIATIONS AND ACRONYMS .................................................................................. iv I. INTRODUCTION ................................................................................................................................... 1 Site Background ...................................................................................................................................... 1 FIVE-YEAR REVIEW SUMMARY FORM ......................................................................................... 2 II. RESPONSE ACTION SUMMARY ...................................................................................................... 4 Basis for Taking Action .......................................................................................................................... 4 Response Actions .................................................................................................................................... 4 Status of Implementation ........................................................................................................................ 6 Systems Operations/Operation and Maintenance (O&M) .................................................................... 10 III. PROGRESS SINCE THE PREVIOUS REVIEW .............................................................................. 10 IV. FIVE-YEAR REVIEW PROCESS .................................................................................................... 10 Community Notification, Community Involvement and Site Interviews ............................................. 10 Data Review .......................................................................................................................................... 11 Site Inspection ....................................................................................................................................... 14 V. TECHNICAL ASSESSMENT ............................................................................................................ 14 QUESTION A: Is the remedy functioning as intended by the decision documents? .......................... 14 QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels and RAOs used at the time of the remedy selection still valid? ............................................................................................... 15 QUESTION C: Has any other information come to light that could call into question the protectiveness of the remedy? ............................................................................................................... 15 VI. ISSUES/RECOMMENDATIONS ..................................................................................................... 16 OTHER FINDINGS.............................................................................................................................. 16 VII. PROTECTIVENESS STATEMENT ................................................................................................ 16 VIII. NEXT REVIEW .............................................................................................................................. 16 APPENDIX A – REFERENCE LIST..................................................................................................... A-1 APPENDIX B – CURRENT SITE STATUS ......................................................................................... B-1 APPENDIX C – SITE CHRONOLOGY ................................................................................................ C-1 APPENDIX D – SITE MAPS ................................................................................................................ D-1 APPENDIX E – PRESS NOTICE ........................................................................................................... E-1 APPENDIX F – INTERVIEW FORMS .................................................................................................. F-1 APPENDIX G – SITE INSPECTION CHECKLIST ............................................................................. G-1 APPENDIX H – SITE INSPECTION PHOTOS.................................................................................... H-1 APPENDIX I – DATA FIGURES ............................................................................................................ I-1 APPENDIX J – DETAILED ARARS REVIEW TABLES .................................................................... J-1 APPENDIX K – SCREENING-LEVEL RISK REVIEW ...................................................................... K-1 APPENDIX L – RESTRICTIVE COVENANT ...................................................................................... L-1 Tables Table 1: COCs, by Media ........................................................................................................................... 4 Table 2: Groundwater COC Remediation Goal .......................................................................................... 5 Table 3: Summary of Planned and/or Implemented Institutional Controls (ICs) ....................................... 7 Table 4: 2011 Restrictive Covenant Usage Restrictions by Area ............................................................... 8 Table 5: Protectiveness Determinations/Statements from the 2016 FYR ................................................ 10 ii Table 6: Maximum Detections of COCs (μg/L) in the Bone Valley Unit ................................................ 12 Table C-1: Site Chronology .................................................................................................................... C-1 Table J-1: Groundwater Remediation Goal Comparison......................................................................... J-1 Table K-1: Screening Level Evaluation of 2010 Soil Sampling ............................................................. K-1 Table K-2: Screening-Level Vapor Intrusion Risk Evaluation of January 2020 Shallow Groundwater VOC Results ........................................................................................................................................... K-1 Figures Figure 1: Site Vicinity Map ........................................................................................................................ 3 Figure 2: Institutional Control Map ............................................................................................................ 9 Figure 3: Detailed Site Map ...................................................................................................................... 13 Figure D-1: 1989 ROD Site Map ............................................................................................................ D-1 Figure D-2: Hydrogeologic Cross Section .............................................................................................. D-2 Figure D-3: Groundwater Monitoring Groundwater Elevation .............................................................. D-3 Figure D-4: 2010 Soil Sampling Location Map ..................................................................................... D-4 Figure I-1: Historical Trends of Benzene in Bone Valley Unit (2010-2020) ........................................... I-1 Figure I-2: Historical Trends of Benzene in Spoil Row, Oil Pond and North Dike Wells (2010-2020) .. I-2 Figure I-3: Historical Trends of Vinyl Chloride in Bone Valley Unit (2010-2020) ................................. I-3 Figure I-4: Historical Trends of Vinyl Chloride in Bone Valley Unit (2010-2020) ................................. I-4 iii LIST OF ABBREVIATIONS AND ACRONYMS ARAR Applicable or Relevant and Appropriate Requirement CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CFR Code of Federal Regulations COC Contaminant of Concern EIP-USA Energy Industrial Park-Urban Service Area EPA United States Environmental Protection Agency ESD Explanation of Significant Differences FDEP Florida Department of Environmental Protection FDER Florida Department of Environmental Regulation FYR Five-Year Review IC Institutional Control LLC Limited Liability Company μg/L Microgram per Liter MCL Maximum Contaminant Level mg/kg Milligram per Kilogram NCP National Contingency Plan NPL National Priorities List O&M Operation and Maintenance OU Operable Unit PRP Potentially Responsible Party RAO Remedial Action Objective RCRA Resource Conservation and Recovery Act ROD Record of Decision RPM Remedial Project Manager UU/UE Unlimited Use and Unrestricted Exposure VOC Volatile Organic Compound iv I. INTRODUCTION The purpose of a five-year review (FYR) is to evaluate the implementation and performance of a remedy to determine if the remedy is and will continue to be protective of human health and the environment. The methods, findings and conclusions of reviews are documented in FYR reports such as this one. In addition, FYR reports identify issues found during the review, if any, and document recommendations to address them. The U.S. Environmental Protection Agency is preparing this FYR pursuant to the Comprehensive Environmental
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