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Assessment of Corrective Measures Report, Conesville Ash Pond

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Assessment of Corrective Measures Report, Conesville Ash Pond Assessment of Corrective Measures Report, Conesville Ash Pond American Electric Power Service Corporation Conesville Generating Station, Conesville, Coshocton County, Ohio Project # 7362192661 Prepared for: American Electric Power Service Corporation 1 Riverside Plaza, Columbus, Ohio 43215 24 June 2019 Assessment of Corrective Measures Report, Conesville Ash Pond American Electric Power Service Corporation Conesville Generating Station, Conesville, Coshocton County, Ohio Project # 7362192661 Prepared for: American Electric Power Service Corporation 1 Riverside Plaza, Columbus, Ohio 43215 Prepared by: Wood Environment & Infrastructure Solutions, Inc. 921 Eastwind Drive, Suite 129 Westerville, OH 43081 USA T: 614-943-0567 24 June 2019 Copyright and non-disclosure notice The contents and layout of this report are subject to copyright owned by Wood (© Wood Environment & Infrastructure Solutions, Inc.). save to the extent that copyright has been legally assigned by us to another party or is used by Wood under license. To the extent that we own the copyright in this report, it may not be copied or used without our prior written agreement for any purpose other than the purpose indicated in this report. The methodology (if any) contained in this report is provided to you in confidence and must not be disclosed or copied to third parties without the prior written agreement of Wood. Disclosure of that information may constitute an actionable breach of confidence or may otherwise prejudice our commercial interests. Any third party who obtains access to this report by any means will, in any event, be subject to the Third Party Disclaimer set out below. Third-party disclaimer Any disclosure of this report to a third party is subject to this disclaimer. The report was prepared by Wood at the instruction of, and for use by, our client named on the front of the report. It does not in any way constitute advice to any third party who is able to access it by any means. Wood excludes to the fullest extent lawfully permitted all liability whatsoever for any loss or damage howsoever arising from reliance on the contents of this report. We do not however exclude our liability (if any) for personal injury or death resulting from our negligence, for fraud or any other matter in relation to which we cannot legally exclude liability. Wood Environment & Infrastructure Solutions, Inc. Assessment of Corrective Measures Report, Conesville Ash Pond American Electric Power Service Corporation Table of Contents Document Purpose ............................................................................................................................................. 1 Review of Data Sources .................................................................................................................................... 1 2.0 Site Background ................................................................................................................................................... 2 Site Description and History ........................................................................................................................... 2 2.1.1 General Description of the APS .................................................................................................... 3 2.1.2 Construction and Operational History ....................................................................................... 3 2.1.3 Leachate and Water Management .............................................................................................. 3 2.1.4 CCR Regulatory Status ..................................................................................................................... 3 Conceptual Site Model ..................................................................................................................................... 4 2.2.1 Climate and Water Budget ............................................................................................................. 4 2.2.2 Geologic Setting ................................................................................................................................. 4 2.2.3 Groundwater Flow System Characteristics ............................................................................... 5 2.2.4 Surface Water and Surface Water-Groundwater Interactions .......................................... 5 2.2.5 Groundwater Gradients and Flow Directions .......................................................................... 6 2.2.6 Groundwater Monitoring Network.............................................................................................. 7 2.2.7 Arsenic, Lithium and Molybdenum Transport in Groundwater ....................................... 7 3.0 Identification and Development of Corrective Measure Alternatives ............................................................. 9 Establishment of Corrective Action Objectives (CAOs) ........................................................................ 9 Screening and Evaluation of Remedial Technologies .........................................................................10 Development of Corrective Measures Alternatives .............................................................................11 4.0 Detailed Evaluation of Corrective Measure Alternatives ....................................................................................11 Source Control Description ...........................................................................................................................12 4.1.1 Pond Dewatering ..............................................................................................................................12 4.1.2 Closure by Removal .........................................................................................................................12 4.1.3 Closure by Capping .........................................................................................................................13 4.1.4 Closure Incorporating In Situ Stabilization ............................................................................13 4.1.5 Evaluation ............................................................................................................................................14 4.1.6 Summary ..............................................................................................................................................15 Monitored Natural Attenuation ..................................................................................................................15 4.2.1 Description ..........................................................................................................................................15 4.2.2 Evaluation ............................................................................................................................................15 4.2.2.1 Overall Protection of Human Health and Environment ....................................15 4.2.2.2 Ability to Meet Groundwater Protection Standards ..........................................16 4.2.2.3 Source Control and Reduction of Contaminated Material..............................16 4.2.2.4 Long Term Effectiveness ...............................................................................................16 4.2.2.5 Short Term Effectiveness ..............................................................................................16 4.2.2.6 Implementability ..............................................................................................................16 4.2.2.7 Long-Term Management Requirements ................................................................17 4.2.2.8 Community Acceptance ................................................................................................17 4.2.2.9 State Acceptance .............................................................................................................17 4.2.2.10 Time to Meet Remedial Objectives ...........................................................................17 Groundwater Extraction, Treatment and Surface Water Discharge ..............................................17 4.3.1 Description ..........................................................................................................................................17 4.3.2 Evaluation ............................................................................................................................................18 4.3.2.1 Overall Protection of Human Health and Environment ....................................18 Project # 7362192661 | 24 June 2019 Page i of 26 Wood Environment & Infrastructure Solutions, Inc. Assessment of Corrective Measures Report, Conesville Ash Pond American Electric Power Service Corporation 4.3.2.2 Ability to Meet Groundwater Protection Standards ..........................................19 4.3.2.3 Source Control and Reduction of Contaminated Material..............................19 4.3.2.4 Long Term Effectiveness ...............................................................................................19 4.3.2.5 Short Term Effectiveness ..............................................................................................19 4.3.2.6 Implementability ..............................................................................................................20 4.3.2.7 Long-Term Management Requirements ................................................................20 4.3.2.8 Community Acceptance
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