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Coal Combustion Residues (CCR) - Surface Impoundments
with High Hazard Potential Ratings
Over the past several years, EPA has undertaken a concerted effort to identify and to assess the structural integrity of impoundments, dams, or other management units, within the electric power generating industry, holding wet-handled coal combustion residuals or CCRs.
In response to an EPA information request on units handling wet or slurried CCRs, electric utilities have so far identified a total of 676 units managing slurried CCRs at 240 facilities. Forty-five of these units at 27 different locations were assigned a high hazard potential rating. Hazard potential ratings are generally assigned by the State Dam Safety officials.
The National Inventory of Dams hazard potential ratings address the potential consequences of failure or mis-operation of the dam. A high hazard potential rating indicates that a failure will probably cause loss of human life; the rating is not an indication of the structural integrity of the unit or the possibility that a failure will occur in the future; it merely allows dam safety and other officials to determine where significant damage or loss of life may occur if there is a structural failure of the unit. EPA has completed assessment of the facilities that have units with high hazard potential ratings and has found no immediate safety concerns. EPA is making public the results of our assessments as they are completed.
CCRs consist of fly ash, bottom ash, coal slag, and flue gas desulfurization (FGD) residue. CCRs contain a broad range of metals, for example, arsenic, selenium, cadmium, lead, and mercury, but the concentrations of these are generally low. However, if not properly managed, (for example, in lined units), CCRs may cause a risk to human health and the environment and, in fact, EPA has documented cases of environmental damage.
Information on the presence of these is important to States, local officials, including first responders, and the residents of local communities so that appropriate preparedness efforts can be undertaken, reviewed, or maintained.
Many States have active dam safety programs and, in many cases, local government agencies, first responders, and the local community are involved in preparedness efforts. By providing this information, EPA's goal is to assist in these efforts.
The 45 CCR management units at 27 facilities below were assigned a High Hazard Potential rating, as of May 2009.
As part of EPA's assessment of these units, the agency reviewed the hazard potential rating of every unit using the National Inventory of Dams rating system. EPA will post a revised and updated table in the near future.
An example of how the hazard potential ratings may change is what occurred with the Dan River facility. Duke Energy Corporation identified the Primary Pond and Secondary Pond at the Dan River facility to be “High Hazard” units. It is EPA’s understanding that this response from Duke Energy Corporation was based on the state of North Carolina’s dam hazard potential criteria. North Carolina has a number of criteria that indicate whether a dam has a high hazard potential classification; these criteria include environmental and economic losses exceeding $200,000. Under North Carolina’s system a dam need only meet one of the criteria in order to be considered a high hazard potential.
On May 27-28, 2009, EPA and EPA’s engineering contractor conducted site assessments at the Dan River facility of both the Primary Pond and Secondary Pond. As a result of that assessment, and based on the National Inventory of Dams Rating System, EPA found that these impoundments should be classified as “Significant Hazard” units and reflected that classification in the final reports for these units. EPA classified these units as “Significant Hazard” based on expected economic and environmental losses but no expected loss of human life resulting from potential failure of the impoundment embankments. The Impoundment Assessment Report and associated documents reflect the significant hazard rating.
|Company||Facility Name||Unit Name||Location/State Contact|
|Allegheny Energy||Pleasants Power Station||McElroy's Run Embankment||Willow Island, WV|
|American Electric Power||Big Sandy||Fly Ash||Louisa, KY|
|American Electric Power||Cardinal||Fly Ash Reservoir 2||Brilliant, OH|
|American Electric Power||General James M Gavin||Fly Ash Pond||Cheshire, OH|
|American Electric Power||General James M Gavin||Bottom Ash Pond||Cheshire,OH|
|American Electric Power||John E Amos||Fly Ash Pond||St. Albans, WV|
|American Electric Power||Mitchell||Fly Ash Pond||Moundsville, WV|
|American Electric Power||Muskingum River||Unit 5 Bottom Ash Pond (Lower Fly Ash Pond)||Waterford, OH|
|American Electric Power||Muskingum River||Upper Fly Ash Pond||Waterford, OH|
|American Electric Power||Muskingum River||Middle Fly Ash Pond||Waterford, OH|
|American Electric Power||Philip Sporn||Fly Ash Pond||New Haven,WV|
|American Electric Power||Tanners Creek||Fly Ash Pond||Lawrenceburg, IN|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Ash Pond 4||Cochise, AZ|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Ash Pond 1||Cochise, AZ|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Ash Pond 3||Cochise, AZ|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Scrubber Pond 2||Cochise, AZ|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Scrubber Pond 1||Cochise, AZ|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Evaporation 1||Cochise, AZ|
|Arizona Electric Pwr Coop Inc||Apache Station Combustion Waste Disposal Facility||Ash Pond 2||Cochise, AZ|
|Arizona Public Service Co||Cholla||Bottom Ash Pond||Joseph City AZ|
|Arizona Public Service Co||Cholla||Fly Ash Pond||Joseph City AZ|
|Duke Energy Corp||Allen Steam Plant||Active Ash Pond||Belmont, NC|
|Duke Energy Corp||Belews Creek Steam Station||Active Ash Pond||Walnut Cove, NC|
|Duke Energy Corp||Buck||New Primary Pond||Spencer, NC|
|Duke Energy Corp||Buck||Secondary Pond||Spencer, NC|
|Duke Energy Corp||Buck||Primary Pond||Spencer, NC|
|Duke Energy Corp||Dan River||Secondary Pond||Eden, NC|
|Duke Energy Corp||Dan River||Primary Pond||Eden, NC|
|Duke Energy Corp||Marshall Steam Station||Active Ash Pond||Terrell, NC|
|Duke Energy Corp||Riverbend||Secondary Pond||Mount Holly, NC|
|Duke Energy Corp||Riverbend||Primary Pond||Mount Holly, NC|
|Dynegy Midwest Generation Inc||Havana||East Ash Pond||Havana, IL|
|Dynegy Midwest Generation Inc||Wood River||East Ash Pond (2 cells)||Alton, IL|
|First Energy Generation Corp||Bruce Mansfield||Little Blue Run Dam||Shippingport, PA|
|Georgia Power||Plant Branch||E||Milledgeville, GA|
|Georgia Power||Plant McDonough||Ash Pond 4||Symra, GA|
|Kentucky Utilities Co||E W Brown||Auxiliary Pond||Harrodsburg, KY|
|Kentucky Utilities Co||E W Brown||Ash Pond||Harrodsburg, KY|
|Kentucky Utilities Co||Ghent||Gypsum Stacking Facility||Ghent, KY|
|Kentucky Utilities Co||Ghent||Ash Pond Basin 1||Ghent, KY|
|Kentucky Utilities Co||Ghent||Ash Pond Basin 2||Ghent, KY|
|Louisville Gas & Electric Co||Cane Run||Ash Pond||Louisville, KY|
|PPL Montana LLC||Colstrip Steam Electric Station||Units 1 & 2 Stage Evaporation Ponds (STEP)||Colstrip, MT|
|Progress Energy Carolinas Inc||Asheville||1982 Pond||Arden, NC|
|Progress Energy Carolinas Inc||Asheville||1964 Pond||Arden, NC|