MAXEY FLATS DISPOSAL SITE ANNUAL REPORT 2014 Energy and Environment Cabinet Department for Environmental Protection Division of Waste Management Superfund Branch Maxey Flats Disposal Site 2597 Maxey Flat Road Hillsboro, KY 41049 606-783-8680 Table of Contents Page List of Figures ......................................................................................................................ii List of Acronyms ..................................................................................................................ii List of Appendices ...............................................................................................................iii 1.0 Introduction ............................................................................................................1 2.0 Scope of Work .........................................................................................................1 3.0 Surface Water Monitoring ......................................................................................1 3.1 East Detention Basin ........................................................................................2 3.2 Perennial Surface Water ..................................................................................2 3.3 Drainage Channels Water ................................................................................3 3.4 Sampling Equipment Status .............................................................................3 4.0 Groundwater Monitoring Wells ..............................................................................4 4.1 Alluvial Wells ....................................................................................................4 4.1.1 Tritium Evaluation 2014 ..........................................................................4 4.1.2 Arsenic Evaluation 2012-2014 .................................................................5 4.2 Perimeter Monitoring Wells .............................................................................5 5.0 Data Management ..................................................................................................6 6.0 Rainfall Data ...........................................................................................................6 7.0 Initial Remedial Phase Cap Maintenance ...............................................................6 7.1 Geomembrane Liner and Boots ..................................................................6 7.2 Headwall Maintenance ...............................................................................6 7.3 Subsidence Monitoring and Repair ............................................................7 7.4 Diversion Berms ..........................................................................................7 7.5 Anchor Trenches .........................................................................................7 7.6 Drainage Channels ......................................................................................7 7.7 Articulating Concrete Block Mat (AB Mat) System .....................................7 7.8 Former Leachate Storage Facility Area .......................................................8 7.9 Inspections ..................................................................................................8 7.10 Equipment Status ........................................................................................8 8.0 Trench Leachate Management and Monitoring .....................................................8 Maxey Flats Disposal Site 2014 Annual Report i Table of Contents (Continued) Page 9.0 Contaminated Liquid and Solid Waste ...................................................................8 10.0 Erosion Monitoring .................................................................................................9 11.0 IMP Work Plan Revisions, Changes, and Correspondence .....................................9 12.0 Custodial Care Activities .........................................................................................9 12.1 Vegetation ...................................................................................................9 12.2 Building and Grounds Maintenance ...........................................................10 12.3 Security Fence ............................................................................................10 12.4 Roadway Maintenance ...............................................................................10 13.0 Cathodic Protection .............................................................................................. 10 14.0 Other Activities and Developments ...................................................................... 10 15.0 Conclusions ........................................................................................................... 11 List of Figures Figure 3-1 MFDS Annual Average Tritium Concentrations (pCi/mL) 2004-2014..............4 List of Acronyms ARARs Applicable or Relevant and Appropriate Requirements BoRP Balance of Remedial Phase Commonwealth Commonwealth of Kentucky DOE U.S. Department of Energy DCW Drainage Channels Water FCP Final Closure Period IRP Initial Remedial Phase IMP Interim Maintenance Period MFDS Maxey Flats Disposal Site O&M Operation and Maintenance Requirement Summary PSVP Performance Standards Verification Plan PSW Perennial Surface Water REI Reasonably Exposed Individual RML Radioactive Material License EPA U.S. Environmental Protection Agency USGS U.S. Geological Survey Maxey Flats Disposal Site 2014 Annual Report ii Table of Contents (Continued) List of Appendices Included on Disc Appendix A Maxey Flats Disposal Site Analytical Data 2014 2014 MFDS Tritium Data 2014 MFDS Alluvial Well Arsenic Study Appendix B Maxey Flats Disposal Site Well Levels 2014 2014 MFDS Alluvial Well Levels 2014 MFDS Perimeter Well Levels Appendix C Maxey Flats Disposal Site Precipitation 2014 2014 MFDS Daily Rainfall Appendix D Maxey Flats Disposal Site IRP Cap 2014 2014 MFDS Liner Repair Map 2014 MFDS Subsidence Measurements Estes Surveying MFDS Subsidence Tracking Form 2003-2014 Appendix E Maxey Flats Disposal Site Trench Sump Information 2014 Leachate Levels for Trench Sump 7-4 2002-2014 2014 MFDS Sump Bottom Measurements 2014 MFDS Sump Leachate Levels 2014 MFDS Trench Freeboard Table Appendix F Maxey Flats Disposal Site Compliance Information 2014 2013-14 MFDS RML 2014 MFDS LLRW Report Appendix G Maxey Flats Disposal Site Drainage Channel Erosion Monitoring 2014 MFDS 2014 East Drain Shaw Monuments MFDS East Drain Erosion USGS Monuments 2011-2014 Maxey Flats Disposal Site 2014 Annual Report iii THIS PAGE INTENTIONALLY LEFT BLANK 1.0 Introduction The Commonwealth is submitting this report in accordance with Section 4.0 of the Performance Standard Verification Plan PSVP (Appendix C of the Interim Maintenance Period (IMP) Work Plan). This report summarizes sampling and maintenance activities listed in the 2003 IMP Work Plan, PSVP, and the Operations and Maintenance (O&M) Requirement Summary (Appendix D of the IMP Work Plan). 2.0 Scope of Work The Final Closure Period (FCP) is ongoing pursuant to the Consent Decree (Civil Action Number 95-58) signed by the United States Environmental Protection Agency (EPA), the Maxey Flats Steering Committee (Settling Private Parties), and the Commonwealth. As of September 2014, the Maxey Flats Steering Committee disbanded, placing the Commonwealth under EPA regulation. The Commonwealth is responsible for the Balance of Remedial Phase (BoRP), which includes tasks that comprise the IMP and FCP as described in the Record of Decision (ROD). Relevant IMP monitoring activities will continue until they are no longer applicable or interfere with remediation currently ongoing within FCP, and will conclude upon EPA’s approval of an Institutional Control Period Work Plan, which is being developed. The following IMP Work Plan obligations will continue through FCP until no longer applicable: • Surface/ground water monitoring • Initial Remedial Phase (IRP) cap maintenance and replacement • Subsidence monitoring • Erosion evaluation • General site maintenance • Contaminated liquid and waste disposal • Data collection, analysis, and reporting • Site drainage and erosion control features The following IMP Work Plan obligations have been suspended: • Trench leachate management and monitoring • Subsidence survey 3.0 Surface Water Monitoring All IMP surface water monitoring locations are evaluated based on tritium sampling results. The 2014 annual tritium averages for all surface water locations were below their specified screening levels. Tritium results for all surface water monitoring appear in Appendix A: 2014 MFDS Tritium Data Maxey Flats Disposal Site 2014 Annual Report Page 1 of 11 3.1 East Detention Basin Surface water runoff from the Maxey Flats Disposal Site (MFDS) is monitored at the East Detention Basin (EDB). Sampling is triggered by storm events of 2.8 inches of rainfall in a 24-hour period. A sequential sampler linked to a meteorological station is programmed to collect a storm event sample at 0.11 inches of rainfall per hour. A total of 28 storm event samples were collected in 2014 and analyzed for tritium; the results range from 0.05 to 3.17 pCi/mL. Figure 3-1 on page 4 provides the annual average for tritium concentrations for 2004-2014. Sample collection from the EDB is a requirement in the Radiological Materials License (RML) issued by the Radiation Health Branch of the Cabinet for Health and Family Services. Pursuant