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Duke Energy Facilities Inspected by EPA and the Condition Ratings Received

Facility Inspected State EPA Condition Rating
Asheville North Carolina Inactive Pond -- Poor1
Active Pond -- Satisfactory
Beckjord Steam Station Ohio Poor2
Belews Creek Steam Station North Carolina Fair
Buck Steam Station North Carolina Satisfactory
Cape Fear North Carolina Poor3
Cayuga Steam Station Indiana Poor
Dan River Steam Station North Carolina Fair
East Bend Steam Station Kentucky Poor
Edwardsport Steam Station Indiana Fair
Gallagher Steam Station Indiana Fair
Gibson Steam Station Indiana Fair
H.F. Lee North Carolina Fair
Marshall Steam Station North Carolina Fair
Mayo North Carolina Satisfactory
Miami Fort Steam Station Ohio Fair
Plant Allen North Carolina Satisfactory
Riverbend Steam Station North Carolina Satisfactory
Robinson South Carolina Satisfactory
Roxboro North Carolina Satisfactory
Sutton North Carolina Fair
W.S. Lee Steam Station South Carolina Satisfactory
Wabash River Steam Station Indiana Fair/Satisfactory
Zimmer Steam Station Ohio Satisfactory

1At the Asheville Plant and the Beckjord Station, the EPA’s contractor ratings of “Poor” for the impoundment dams and dikes were based on the lack of original engineering design documents and the need for additional stability analyses. Minor maintenance deficiencies were documented, but no issues of immediate concern were identified. The “Poor” ratings are not a direct indicator of the structural integrity or soundness of the ash impoundment; just the need for additional studies. Many of the maintenance items identified have been completed. The remainder of the recommendations, including the additional studies, are currently being addressed by Duke Energy.

2At the Beckjord Station, the EPA’s contractor ratings of “Poor” for the impoundment dams and dikes are based on the lack of original engineering design documents and the need for additional stability analyses. Minor maintenance deficiencies were documented, but no issues of immediate concern were identified. The “Poor” ratings are not a direct indicator of the structural integrity or soundness of the ash impoundment, just the need for additional studies. Many of the maintenance items identified have been completed. The remainder of the recommendations including the additional studies are currently being addressed by Duke Energy.

3At the Cape Fear Plant, the EPA’s contractor ratings of "Poor" for the impoundments and dams were based on the desire to see more documentation of slope stability and hydrological studies, and a recommendation for increased vegetation management. The contractor confirmed that the ponds are structurally sound, and that there are no immediate safety concerns.

EPA Inspection Reports and Duke Energy Reponses

EPA Ratings and What They Mean

Satisfactory
No existing or potential management unit safety deficiencies are recognized. Acceptable performance is expected under all applicable loading conditions (static, hydrologic, seismic) in accordance with the applicable criteria. Minor maintenance items may be required.

Fair
Acceptable performance is expected under all required loading conditions (static, hydrologic, seismic) in accordance with the applicable safety regulatory criteria. Minor deficiencies may exist that require remedial action and/or secondary studies or investigations.

Poor
A management unit safety deficiency is recognized for a required loading condition (static, hydrologic, seismic) in accordance with the applicable dam safety regulatory criteria. Remedial action is necessary. A poor rating can also be given to a management unit if documentation supporting its design, such as drawings or calculations, are not available, requiring further studies or investigations to identify any potential dam safety deficiencies. In such a case, a poor rating does not necessarily mean there is a safety deficiency.

Unsatisfactory
Considered unsafe. A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution. Reservoir restrictions may be necessary.

With regard to the above ratings, the USEPA notes on its Coal Ash Report website that expert experience has shown that only impoundments rated as “unsatisfactory” pose immediate safety threats, and the impoundment ratings noted in the reports should be taken in the proper context, since a unit may be found to be structurally sound while it may receive a fair or poor rating based on other factors. As an example, an impoundment might receive a rating of poor due to the lack of documentation related to its design and/or construction more so than its condition.