In 2015, the U.S. Environmental Protection Agency (EPA) issued a new rule addressing the handling, storage and disposal of coal combustion residuals (CCRs). CCRs are the materials that remain after coal is burned.

Two Conesville Plant ash storage sites are included in the CCR monitoring program:

  • The ash pond system
  • The landfill

AEP used both ash storage sites during the operation of the Conesville Station. The site used the ash pond system to receive wet bottom ash. A dry handling system was used for fly ash. Both fly ash and flue gas desulfurization (FGD) materials were placed in a  landfill.

In mid-May 2020 AEP ceased operations of Conesville Plant, the plant has stopped placing material into the pond and landfill.

On June 5, 2020, AEP transferred ownership of the site to Conesville Industrial Park, LLC., (CIP) who will move forward with plans to clean close the CCR impoundment.

CIP is also looking to take advantage of opportunities to beneficially reuse as much CCR material as possible.

Conesville Industrial Park Information

Groundwater Monitoring Report & Statistical Analysis

June 2020

CIP is continuing with the AEP established groundwater monitoring program and will continue to develop Mitigation Plans to address any impacts.

September 2019
AEP continued its groundwater monitoring activities around Conesville Plant’s coal ash storage sites. Data was analyzed relative to EPA groundwater protection standards.

Analysis by an independent third party indicates that the ash pond system is causing the levels of arsenic, lithium and molybdenum in the groundwater within the plant site to rise above EPA standards. Additional analysis of groundwater beyond the plant site shows ash pond impacts for lithium and molybdenum. Property owners above impacted groundwater have been notified. No impacts were identified from the landfill.

AEP developed a mitigation plan to address the groundwater impacts.

AEP proactively met with neighbors and community leaders to share information, answer questions and discuss next steps. AEP also conducted a public meeting to explain our progress to date and to review potential groundwater remediation options. Public input from that meeting will be considered in making a final decision on remediation measures. 

Coal Combustion Residuals Monitoring & Reporting

June 2020
CIP is continuing with the AEP established CCR groundwater monitoring and Reporting program.

March 2018
AEP completed the first steps in the new groundwater monitoring program under this rule.

AEP took a series of groundwater samples at the boundaries of both ash storage sites, including samples before the groundwater passed beneath the ash storage sites. (The reports refer to this as up-gradient.) AEP took other samples after it passed beneath the sites (down-gradient) and used the data to establish baseline levels for 21 different substances in the groundwater. Moving forward, CIP will use these baselines to help determine if our ash storage sites are impacting the groundwater.
It is important to remember that variations in the level of these substances in groundwater are natural and occur for many reasons.
The initial data at Conesville Plant show potential groundwater impacts very close to storage sites on the property. This led to the expansion of the groundwater monitoring program at Conesville Plant to look at 21 substances in the groundwater at the plant site.

We are working to understand what the numbers mean. We have other wells on the plant site that are not specifically part of this program. We will now take samples at these wells to better understand groundwater conditions farther from the ash storage sites. For these purposes, AEP installed 30 additional wells and began to gather data from them. We also know that nearby wells used for public drinking water are tested regularly to ensure they meet drinking water standards.

AEP proactively reached out and met with plant neighbors and community leaders to answer questions about the data collected so far and to discuss next steps.

Alternate Source Reviews

June 2020

CIP is reviewing the AEP established Alternate Source Reviews with our consultants to determine if additional steps are necessary.

Independent third parties completed Alternate Source Reviews for the landfill and bottom ash pond sites at Conesville Plant. The reviews consider other factors that could impact sampling results as the groundwater passes the CCR storage sites.

AEP completed a successful Alternate Source Review for groundwater impacts at Conesville Plant’s landfill site. The plant will continue sampling groundwater at the landfill to determine any future need for additional monitoring.

An alternate source for groundwater impacts was not found for the bottom ash pond. 

Location Restrictions

November 2018
The CCR rule established location restrictions for coal ash storage sites. It requires that storage site locations be evaluated regarding proximity to groundwater aquifers, wetlands, fault areas, seismic zones and unstable areas (example: presence of quicksand).

AEP recently completed the required review of location restrictions for Conesville Plant’s CCR storage sites. This review found:

  • The Conesville ash pond system is separated from the uppermost aquifer by less than the five feet specified by the rule. It does meet the other four restrictions.
  • The Conesville landfill meets all location restrictions.

Next Steps

June 2020

  • CIP will continue to test water from all of the wells in the groundwater monitoring program twice each year.
  • CIP will develop a plan to mitigate groundwater impacts of the ash pond system, considering public input before making a final decision on mitigation measures, we will take.
  • CIP will begin clean closure activities for the ash pond system upon transfer of the facility.

Additional Information

Ash Pond

CCR-Fugitive Dust Report-2022


196-318 Final Annual Ash Pond Complex Inspection Report

196-318 Final Safety Factor Assessment

196-318 Inflow Design Flood Control Assessment 1.2022

196-318 Periodic Hazard Potential Classification Assessment 1.2022

196-318 Structural Stability Assessment 1.2022

CV-APS-Annual CCR Groundwater Report 01-31-2022

APC CCR_1st 2021 GWQR

Corrective Measures Groundwater Monitoring Plan (CAMP) 7-21

CV APC Selection of Final Remedy Report 5-26-21

196-318-CCR-Fugitive Dust Plan

CCR Notification of Intent to Close – Ash Pond Complex[1]

Conseville CCR Closure Plan – Amendment 1[1]

R – 196-318 FINAL Annual Ash Pond Complex Inspection Report[1]

CV-EAP-CIP-2221 signe final

CV EAP Site Visit Signatures 2021 completed

Final CV-APS-Annual CCR Ash pond Groundwater Report 01-31-2021

Fugitive Dust Report 12-02-20

Semi-Annual Progress Report 12-02-20

Remedy, Selection and Design Progress Report 3-6-20

Groundwater Monitoring and Corrective Action Report 1-31-20

Statistically Significant Level of Constituents Above Groundwater Protection Standard Notification 1-24-20

Certified Engineer Reports for Surface Impoundments 1-10-20

Emergency Action Plan Annual Review Form 11-4-19

Face to Face Meeting Documentation 11-4-19

Fugitive Dust Report 9-30-19

Statistically Significant Level of Constituents Above Groundwater Protection Standard Notification 8-9-19

Notification of Landowners of Influence to Groundwater 7-31-19

Assessment of Corrective Measures 6-24-19

Fugitive Dust Plan 6-19-19

Assessment of Corrective Action Initiation Notification 4-25-19

Assessment and Detecting Monitoring Statistical Reports 2-15-19

Groundwater Monitoring and Corrective Action Report 1-31-19

Statistically Significant Level of Constituents Above Groundwater Protection Standard Notification 2-7-19

Certified Engineer Reports for Surface Impoundments 1-10-2019

Face-to-Face Meeting Documentation 12-18-2018

Location Restrictions Report 10-16-2018

Fugitive Dust Report 9-30-2018

Assessment Monitoring Program Notice 5-13-2018

Annual Groundwater Monitoring Report 1-31-18

Groundwater Monitoring Statistical Evaluation Report 1-15-2018

Emergency Action Plan Revision 2-23-18

EAP Face to Face Meeting or Exercise 11-8-17

Annual Engineering Inspection Report 1-10-2018

Annual Fugitive Dust Report 9-30-2017

Groundwater Monitoring Network Design Report 3-9-2017

Statistical Analysis Plan 2-06-2017

Annual Engineering Inspection Report 1-10-2017

Initial Post-Closure Plan 10-16-2016

Initial Closure Plan 10-16-2016

History of Design and Construction 10-16-2016

Initial Design Flood Control Plan 10-16-2016

Safety Factor Assessment 10-16-2016

Structural Stability Assessment 10-16-2016

Annual Fugitive Dust Report 9-30-2016

Initial Hazard Assessment Certification 8-01-2016

Liner Design Certification 8-01-2016

Annual Engineering Inspection Report 12-31-2015