## Summary Table for Impoundment Reports (April 10, 2013) http://www.epa.gov/osw/nonhaz/industrial/special/fossil/surveys2/index.htm

Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Alabama Power Company Gorgas Steam Plant Parrish, AL 1 Ash Pond (NID #1198) Rattlesnake Dam Rattlesnake Dam Significant N/A Significant Satisfactory Alabama Power Company Gorgas Steam Plant Parrish, AL 1 Gypsum Pond Gypsum Ponds None N/A Significant Satisfactory American Electric Power Tanner Creek Power Plant Lawrenceburg, IN 1 Bottom Ash Complex Bottom Ash Complex Significant Significant (Company), Low (State) Significant Fair American Electric Power General James Gavin Power Plant Cheshire, OH 1 Bottom Ash Pond Bottom Ash Pond High High (State) - Fair
American Electric Power General James Gavin Power Plant Cheshire, OH 1 Fly Ash Pond Stingy Run Dam High High (State) - Fair American Electric Power Tanner Creek Power Plant Lawrenceburg, IN 1 Fly Ash Pond Fly Ash Pond High High (Company), Low (State) Significant Satisfactory Arizona Public Service Four Corners Power Plant Fruitland, NM 1 Lined Ash Impoundment Lined Ash Impoundment Significant Significant (State) Significant Satisfactory Arizona Public Service Four Corners Power Plant Fruitland, NM 1 Lined Water ImpoundmentLined Decant Water Impoundment Significant Significant (State) Significant Satisfactory Duke Energy Buck Steam Station Spencer, NC 1 New Primary Pond Basin 1 (New Dike) High High (State) Significant Satisfactory Duke Energy Buck Steam Station Spencer, NC 1 Primary Pond Basin 2 (Main Dike) High High (State) Significant Satisfactory Duke Energy Dan River Eden, NC 1 Primary Pond Primary Pond High High (State) Significant Fair Duke Energy Buck Steam Station Spencer, NC 1 Secondary Pond Basin 3 (Diverter Dike) High N/A Significant Satisfactory Duke Energy Dan River Eden, NC 1 Secondary Pond Secondary Pond High High (State) Significant Fair Duke Energy Allen Steam Station Belmont, NC 1 Active Ash Pond East Dike High High (State) Significant Satisfactory Duke Energy Marshall Steam Station Catawba County, NC 1 Active Ash Pond Coal Ash Retention Dam High High (State) Significant Fair Duke Energy Allen Steam Station Belmont, NC 1 North Dike (Add this unit to DB) North Dike High (State) Significant Satisfactory
Duke Energy Riverbend Steam Station Mt. Holly, NC 1 Primary Pond Primary Ash Pond High High (State) Significant SatisfactoryThe diverter dike between the primary and secondar ash pond is built on top of coal combustion residual material. Duke Energy Riverbend Steam Station Mt. Holly, NC 1 Secondary Pond Secondary Ash Pond High High (State) - Satisfactory Dynegy Midwest Generation, Inc. Havana Power Plant Havana, IL 1 East Ash Pond East Ash Pond System High High (State) - Satisfactory Dynegy Midwest Generation, Inc. Wood River Power Station Alton, IL 1 East Ash Pond (2 cells) East Ash Pond System High High (State) - Satisfactory Dynegy Midwest Generation, Inc. Wood River Power Station Alton, IL 1 West Ash Pond (2 cells) Cells 2E and 3 West Ash Pond System Low Low (State) - Satisfactory E.ON - Louisville Gas & Electric - Trimble County Station Bedford, KY 1 Ash Pond Bottom Ash Pond Significant Significant (State) - Satisfactory Georgia Power Company Plant Bowen Cartersville, GA 1 Ash Pond Plant Bowen Ash Pond Low Category II (State) Significant Satisfactory

Ohio Valley Electric CorporationIndiana Kentucky Electric Corporation Clifty Creek Generating Plant Madison, IN 1 Add this unit to database; this unit appears to be combined with West Boiler Slag Pond in DB) South Fly Ash Pond Dam Significant (State) Significant SatisfactoryOhio Valley Electric CorporationIndiana Kentucky Electric Corporation Clifty Creek Generating Plant Madison, IN 1 West Boiler Slag Pond West Bottom Ash Pond Dam Significant N/A Significant Satisfactory PacifiCorp Energy Jim Bridger Power Station Point of Rocks, WY 1 FGD Pond #1 FGD Pond 1 Significant Significant (State) - Fair PacifiCorp Energy Jim Bridger Power Station Point of Rocks, WY 1 FGD Pond #2 FGD Pond 2 Significant Significant (State) - Fair PPL Montana Colstrip Power Plant Colstrip, MT 1 Units 1 & 2 A Pond Units 1 & 2 "A" Fly Ash Pond Significant Significant (company) - Fair PPL Montana Colstrip Power Plant Colstrip, MT 1 Units 1 & 2 Bottom Ash Pond Units 1 & 2 Bottom Ash Ponds Significant Significant (company) - Fair
PPL Montana Colstrip Power Plant Colstrip, MT 1 Units 1 & 2 Stage Evaporation Ponds (STEP)Units 1 & 2 Stage Two Evaporation Pond High High (company) - Fair PPL Montana Colstrip Power Plant Colstrip, MT 1 Units 3 & 4 Effluent Holding Pond (EHP) Units 3 & 4 Effluent Holding Ponds Low Low (company) Significant Fair Progress Energy Cape Fear Plant Moncure, NC 1 1956 Ash Pond (Add this unit to DB) 1956 Ash Pond N/A Significant Poor Progress Energy Cape Fear Plant Moncure, NC 1 1963 Ash Pond (Add this unit to DB) 1963 Ash Pond Low (Company) Significant Poor Progress Energy Asheville Electric Plant Buncombe County, NC 1 1964 Pond 1964 Pond High High (Company) - Poor Progress Energy Cape Fear Plant Moncure, NC 1 1970 Pond 1970 Ash Pond Low Low (Company) Significant Poor Progress Energy Cape Fear Plant Moncure, NC 1 1978 Pond 1978 Ash Pond Significant Significant (State) Significant Poor Progress Energy Asheville Electric Plant Buncombe County, NC 1 1982 Pond 1982 Pond High High (Company) - Satisfactory



### Page 1 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Progress Energy Mayo Generating Plant Roxboro, NC 1 1982 Pond Mayo Ash Pond Significant Significant (Company) - Satisfactory Progress Energy Cape Fear Plant Moncure, NC 1 1985 Pond 1985 Ash Pond Significant Significant (State) Significant Poor

Tri-State Escalante Generating Station McKinley County, NM 1 N/A There are no coal combustion waste impoundments on-site. Impoundments on-site are for temporary storage of scrubber sludge to facilitate drying and wastewater evaporation. Coal combustion waste is disposed of in the on-site landfill. Most fly ash is shipped off site as commercial product. This facility was flagged for assessment based on the hazard ratings and survey responses for units thought to be used for disposal of wet CCWs. On-site assessment revealed that no unit met the criteria for assessment. Vectren A.B. Brown Generating Station Posey County, IN 1 Lower Dam Lower Ash Pond Dam Significant Significant (State) Significant Fair Vectren A.B. Brown Generating Station Posey County, IN 1 Upper Dam Upper Ash Pond Dam None N/A Significant Satisfactory Westar Energy Jeffrey Energy Center Pottawatomie County, KS 1 Bottom Ash Lake Dam Bottom Ash Lake Dam Significant Significant (State) - Fair Westar Energy Jeffrey Energy Center Pottawatomie County, KS 1 Bottom Ash Pond Dam Bottom Ash Pond Dam None Low (State) - Fair American Electric Power John E Amos St Albans, WV 2 Bottom Ash Complex John Amos Bottom Ash Pond Complex Significant Significant (State) Significant Satisfactory American Electric Power John E Amos St Albans, WV 2 Fly Ash Pond John Amos Fly Ash Dam High High (State) High Satisfactory

American Electric Power Mitchell Moundsville, WV 2 Bottom Ash Complex Bottom Ash Complex (Bottom Ash Pond and Clear Water Pond) Significant Significant (Company) Significant Satisfactory American Electric Power Mitchell Moundsville, WV 2 Fly Ash Pond Conner Run Dam (Fly Ash Pond) High High (Company) High Satisfactory American Electric Power Mountaineer New Haven, WV 2 Bottom Ash Complex Bottom Ash Complex Significant Significant (Company and State) Significant Satisfactory American Electric Power Philip Sporn New Haven, WV 2 Bottom Ash Pond Bottom Ash Pond Significant Significant (State and Company) Significant Fair American Electric Power Philip Sporn New Haven, WV 2 Fly Ash Pond Fly Ash Pond High High (Company), Significant Fair

American Electric Power Cardinal Brilliant, OH 2 Bottom Ash Complex Bottom Ash Complex (Bottom Ash Pond and Recirculation Pond) Significant Significant (State) Significant Fair Contractor recommends AEP-Cardinal perform a Liquidfaction Analysis on Bottom Ash Pond And Recirculation Pond American Electric Power Cardinal Brilliant, OH 2 Fly Ash Reservoir 2 Fly Ash Reservoir No. 2 High High (State) High Satisfactory

American Electric Power Cardinal Brilliant, OH 2 Fly Ash Reservoir No. 1 (Decomissioned in 1991) (Add this unit to DB) Fly Ash Reservoir No. 1 (Decomissioned in 1991) High (State) Low Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Ash Pond 1 Ash Pond 1 High High (State) High Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Ash Pond 2 Ash Pond 2 High High (State) High Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Ash Pond 3 Ash Pond 3 High High (State) High Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Ash Pond 4 Ash Pond 4 High High (State) High Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Evaporation 1 Evaportation Pond High High (State) High Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Scrubber Pond 1 Scrubber Sludge Pond 1 High High (State) High Satisfactory Arizona Electric Pwr Coop IncApache Cochise, AZ 2 Scrubber Pond 2 Scrubber Sludge Pond 2 High High (State) High Satisfactory Arizona Public Service Co Cholla Joseph City, AZ 2 Bottom Ash Pond Bottom Ash Pond Dam High High (State) High Satisfactory Arizona Public Service Co Cholla Joseph City, AZ 2 Fly Ash Pond Fly Ash Pond Dam High High (State) High Satisfactory Big Rivers (Recently bought from Western KY) Reid/Green/HMPL Robards, KY 2 Ash Pond Reid/HMPL Ash Pond Significant Significant (State) Significant Fair Big Rivers (Recently bought from Western KY) Reid/Green/HMPL Robards, KY 2 Green Ash Pond (add to database) Green Ash Pond Low (State) Low Fair Duke Energy Belews Creek Walnut Cove, NC 2 Active Ash Pond Ash Basin High High (Company) High Fair Contractor recommends updating hydrologic and hydraulic analysis

First Energy Generation CorpBruce Mansfield Shipping Port, PA 2 East HDS (Decommissioned in 2003) (Add this unit to DB) East HDS (Decommissioned in 2003) N/A N/A N/A First Energy Generation CorpBruce Mansfield Shipping Port, PA 2 North LDS Pond (N-LDS) North LDS Pond Significant High (State) Significant Satisfactory First Energy Generation CorpBruce Mansfield Shipping Port, PA 2 South LDS Pond (S-LDS)South Low Dissolved Solids (LDS) Pond Significant High (State) Significant Satisfactory



### Page 2 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes First Energy Generation CorpBruce Mansfield Shipping Port, PA 2 West HDS Pond (WHPDS) West High Dissolved Solids (HDS) Pond Significant High (State) Significant Satisfactory Louisville Gas & Electric Co.Mill Creek Louisville, KY 2 Ash Pond Ash Pond Significant Significant (State) High Fair Northern States Sherburne County Becker, MN 2 Bottom Ash Pond Bottom Ash Pond Significant Significant (State) Significant Satisfactory Northern States Sherburne County Becker, MN 2 Pond No. 1 Pond No. 1 Low Low (Company) Low SatisfactoryPond No. 1 is going through final closure Northern States Sherburne County Becker, MN 2 Pond No. 2 Pond No. 2 Significant Significant (State) Significant Satisfactory Northern States Sherburne County Becker, MN 2 Pond No. 3 Pond No. 3 Significant Significant (State) Significant Satisfactory PacifiCorp Naughton Kemmerer, WY 2 FGD Pond #1 FGD #1 Pond None Not classified (State) Significant Satisfactory PacifiCorp Naughton Kemmerer, WY 2 FGD Pond #2 FGD #2 Pond Significant Significant (State) Significant Satisfactory PacifiCorp Naughton Kemmerer, WY 2 North Ash Pond North Ash Pond Low Low (State) Significant Satisfactory PacifiCorp Naughton Kemmerer, WY 2 South Ash Pond South Ash Pond Low Low (State) Significant Satisfactory PPL Generation Martins Creek Bangor, PA 2 Ash Basin 4 Ash Basin No. 4 (Closure plan under review by state) Significant High (State) High Satisfactory

PPL Generation Martins Creek Bangor, PA 2 Ash Basin No. 1 (Closure plan under review by state; can be added to DB) Ash Basin No. 1 (Closure plan under review by state) Low (State) Low Satisfactory

PPL Generation Martins Creek Bangor, PA 2 Ash Basin No. 2 (unit closed, can still add to DB) Ash Basin No. 2 Closed with soil cap (1979), not regulated by state.

- - Ash Basin no.2 closed 1979

PPL Generation Martins Creek Bangor, PA 2 Ash Basin No. 3 (unit closed, can still add to DB) Ash Basin No. 3 Closed with soil cap (late 1980s), not regulated by state.
- - Ash Basin no.3 closed late 1980s Progress Energy Roxboro Person County, NC 2 Ash Pond West Ash Pond Significant Significant (Company) Significant Satisfactory Progress Energy Roxboro Person County, NC 2 FGD Flush Pond FGD Flush Pond Significant Significant (Company) Significant Fair FGD Ponds are located within Ash pond Progress Energy Roxboro Person County, NC 2 FGD Settling Pond FGD Settling Pond Significant Significant (Company) Significant Fair Salt River Project Coronado St Johns, AZ 2 Evaporation Pond/Dam Evaporation Pond Dam Significant Significant (State) Significant Satisfactory AEP Big Sandy Louisa, KY 3 Bottom Ash Complex Bottom Ash Complex Low Low Significant Fair

AEP Big Sandy Louisa, KY 3 Fly Ash Fly Ash Ponds (Horseford Run Dam and Saddle Dam) High High (State) - SatisfactoryPond built with compacted clay. Operating under conditions of expired NPDES permit. AEP Conesville Power StationConesville, OH 3 Ash Pond Complex Ash Pond complex Significant Significant Significant Fair
AEP Muskingum River Waterford, OH 3 Middle Fly Ash Pond Middle Fly Ash Reservoir Dams High High (State) High Fair Embankment material: clay and bottom ash.
AEP Muskingum River Waterford, OH 3 Unit 1-4 Boiler Slag Pond Units 1-4 Bottom Ash Pond Dam Low Significant (State) Significant Poor

AEP Muskingum River Waterford, OH 3 Unit 5 Bottom Ash Pond (Lower Fly Ash Pond) Lower Fly Ash Reservoir Dam High High (State) High Fair Embankment material: earth and bottom ash.

AEP Muskingum River Waterford, OH 3 Upper Fly Ash Pond Upper Fly Ash Reservoir Dams (Mill Stone Creek, No-Name Creek, Wing, Spillway, and Freeboard Dams) High High (State) High SatisfactoryEmbankment material: clay and bottom ash.
Alleghany Energy Pleasants Power Willow Island, WV 3 McElroy's Run Embankment McElroy's Run Dam High High (State) High Fair There are two other impoundments on-site that collect storm water run-off and leachate.

Alleghany Energy R Paul Smith Station Facility- Williamsport, MD, Ponds- Falling Waters, WV 3 Lagoon Dam #3 Ash pond # 3 Significant Significant Significant Satisfactory

Alleghany Energy R Paul Smith Station Facility- Williamsport, MD, Ponds- Falling Waters, WV 3 Lagoon Dam #4 Ash pond # 4 Significant Significant Significant Satisfactory Big Rivers Coleman Hawesville, KY 3 Ash Pond Active Ash Pond A Significant Significant (State) Significant Fair Big Rivers Coleman Hawesville, KY 3 South Ash Pond Inactive Ash Pond C Less than low - Significant Fair Dayton Light & Power Co JM Stuart Station Aberdeen, OH 3 Pond #10 Ash Pond 10 Significant Significant Significant Satisfactory Dayton Light & Power Co JM Stuart Station Aberdeen, OH 3 Pond #3A Ash Pond 3A None Significant Significant Fair No doumentation provied to contractor on stability analysis or soil characteristics. Dayton Light & Power Co JM Stuart Station Aberdeen, OH 3 Pond #5 Ash Pond 5 None Significant Significant Poor Dayton Light & Power Co JM Stuart Station Aberdeen, OH 3 Pond #6 Ash Pond 6 None Significant Significant Poor Dayton Light & Power Co JM Stuart Station Aberdeen, OH 3 Pond #7 Ash Pond 7/7a None Significant Significant Poor Duke Energy Miami Fort Station North Bend, OH 3 Ash Pond A Ash Pond A Significant Significant (State) Significant Fair Duke Energy Miami Fort Station North Bend, OH 3 Ash Pond B Ash Pond B Significant Significant (State) Significant Fair Facility monitors groundwater wells
Duke Energy WC Beckjord Station New Richmond, OH 3 Ash Pond A (add to database, Pond A inactive since 1985) Ash Pond A N/A Significant Poor Pond A inactive since 1985



### Page 3 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Duke Energy WC Beckjord Station New Richmond, OH 3 Ash Pond B Ash Pond B Significant Significant (State) Significant Poor

Duke Energy WC Beckjord Station New Richmond, OH 3 Ash Pond C Ash Pond C Significant Significant (State) Significant Poor
Duke Energy WC Beckjord Station New Richmond, OH 3 Ash Pond C extension Ash Pond C extension Significant Significant (State) Significant Poor pond C extension no longer receiving ash- has groundwater monitoring wells outside of embankment
E.ON - Kentucky Utilities EW Brown Harrodsburg, KY 3 Ash Pond Main Ash Pond High High (State) High SatisfactoryCurrently drained and out of service; construction underway for expansion of facility. E.ON - Kentucky Utilities EW Brown Harrodsburg, KY 3 Auxiliary Pond Auxiliary Ash Pond High High (State) High Satisfactory E.ON - Kentucky Utilities Ghent Facility Ghent, KY 3 Ash Pond Basin 1 Ash Treatment Basin #1 High High (State) High Satisfactory E.ON - Kentucky Utilities Ghent Facility Ghent, KY 3 Ash Pond Basin 2 Ash Treatment Basin #2 High High (State) High Satisfactory E.ON - Kentucky Utilities Ghent Facility Ghent, KY 3 Gypsum Stack Surge/Reclaim Pond Gypsum Stack Surge/Reclaim Pond None Less than low (State) Less than low-incised N/A E.ON - Kentucky Utilities Ghent Facility Ghent, KY 3 Gypsum Stacking Facility Gypsum Stacking Facility High High (State) High SatisfactoryUnder constructions; GW monitoring wells installed; piezometers will be installed E.ON - Kentucky Utilities Ghent Facility Ghent, KY 3 Secondary Ash Treatment Basin Secondary Ash Treatment Basin None Less than low (State) Less than low-incised N/A E.ON - Louisville Gas & Electric Cane Run Power Station Louisville, KY 3 Ash Pond Ash Treatment Basin Complex/EPond High High (State) High Satisfactory E.ON - Louisville Gas & Electric Cane Run Power Station Louisville, KY 3 Dead Storage Pond Basin Pond/Dead Storage Pond None - Low Fair Planned decommissioning

First Energy Bruce Mansfield Shipping Port, PA 3 Little Blue Run Dam Little Blue Run Dam High High (State) High SatisfactoryThe state of PA wants First Energy to obtain a new permit for "Little Blue Saddle Dam", an impoundment that was/is currently considered part of "Little Blue Run Dam". Georgia Power Company Plant Branch Milledgeville, GA 3 A Ash Pond A None - Closed N/A Georgia Power Company Plant Branch Milledgeville, GA 3 B Ash Pond B Significant Category II (State) Significant Fair Further geotech analysis recommended. Georgia Power Company Plant Branch Milledgeville, GA 3 C Ash Pond C None Evaluated by state but not yet classified Significant SatisfactoryFurther geotech analysis recommended. Georgia Power Company Plant Branch Milledgeville, GA 3 D Ash Pond D Significant Category II (State) Significant SatisfactoryFurther geotech analysis recommended. Georgia Power Company Plant Branch Milledgeville, GA 3 E Ash Pond E High Category I (State) High SatisfactoryFurther geotech analysis recommended. Ohio Valley Elec Corp Kyger Creek Station Gallipolis, OH 3 Boiler Slag Pond Bottom Ash Pond Significant Significant (State) High Poor Ohio Valley Elec Corp Kyger Creek Station Gallipolis, OH 3 South Fly Ash Pond South Fly Ash Pond Significant Significant (State) High Poor Allete Inc Clay Boswell Power Station Cohasset, MN 4 Central Wastewater Treatment Pond Waste Water Treatment Pond Significant Significant Significant Poor (8) Height: 0 Ft (below grade) Allete Inc Clay Boswell Power Station Cohasset, MN 4 Coal Pile Sump Does not contain CCRs N/A N/A N/A N/A Does not contain CCRs Allete Inc Clay Boswell Power Station Cohasset, MN 4 Inactive Units 1, 2 & 3 Bottom Ash Pond Inactive Bottom Ash Significant Significant Significant Poor
Allete Inc Clay Boswell Power Station Cohasset, MN 4 Unit 3 Fly Ash Pond Units Combined: Ponds 3,4 and Bottom ash are one unit Significant Significant Significant SatisfactoryActive Ponds include ponds 3,4 and Bottom ash as one unit
Allete Inc Clay Boswell Power Station Cohasset, MN 4 Units 1 - 4 Bottom Ash Pond Units Combined: Ponds 3,4 and Bottom ash are one unit Significant Significant Significant SatisfactoryActive Ponds include ponds 3,4 and Bottom ash as one unit
Allete Inc Clay Boswell Power Station Cohasset, MN 4 Units 1, 2 & 4 Fly Ash and Scrubber Slurry Pond Units Combined: Ponds 3,4 and Bottom ash are one unit Significant Significant Significant SatisfactoryActive Ponds include ponds 3,4 and Bottom ash as one unit

Ameren Energy Generating Co Joppa Power Station Massac County, IL 4 Ash Pond Ash Pond None None Low Fair The impoundment is not regulated as a dam by the Illinois Department of Natural Resources (IDNR), however, EEI and Ameren voluntarily comply with IDNR requirements and have developed an Emergency Action Plan (EAP) and a Dam Safety Program for the impoundment. City of Sikeston Sikeston Power Station Sikeston, MO 4 Bottom Ash Pond Bottom Ash None None High Fair did not find any geotech studies City of Sikeston Sikeston Power Station Sikeston, MO 4 Fly Ash Pond Fly Ash Pond None None Significant Fair Dominion Possum Point Power Station Dumfries, VA 4 Ash Pond D Ash Pond D Significant Significant Significant Satisfactoryimpoundment not receiving CCW Dominion Possum Point Power Station Dumfries, VA 4 Ash Pond E Ash Pond E Significant Significant Significant Fair impoundment not receiving CCW
Dominion Chesapeake Energy Center Chesapeake, VA 4 Bottom Ash/Sedimentation Pond Bottom Ash and Sedimentation Pond None none Significant Poor 2009 2010 engineering report notes urgent actions Dominion Chesterfield Power Station Chester, VA 4 Lower (Old) Ash Pond Lower (Old) Ash Pond None None Significant Fair Dominion Bremo Bluff Power Station Bremo Bluff, VA 4 North Ash North Ash Pond Low Significant significant Fair



### Page 4 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Dominion Chesterfield Power Station Chester, VA 4 Upper (New) Ash Pond Upper (New) Ash Pond Low Low Low Satisfactory Dominion Bremo Bluff Power Station Bremo Bluff, VA 4 West Ash west ash pond None none significant Fair new Schnabel 2009 geotech study Duke Energy Corp Gibson Generating Station Owensville, IN 4 East Ash Pond #1 East Ash Pond #1 None None Low Fair Duke Energy Corp Gibson Generating Station Owensville, IN 4 East Ash Pond #2 East Ash Pond #2 None None Low Fair Duke Energy Corp Gibson Generating Station Owensville, IN 4 East Ash Pond #3 East Ash Pond #3 None None Less than low Fair Duke Energy Corp Gibson Generating Station Owensville, IN 4 East Ash Pond Settling Basin East Ash Pond Settling Basin None None Low Fair Duke Energy Corp Gibson Generating Station Owensville, IN 4 North Ash Pond North Ash Pond None None Low Fair Duke Energy Corp Gibson Generating Station Owensville, IN 4 North Settling Basin North Settling Basin None None Low Fair
Duke Energy Corp Wabash River Power Station Terre Haute, IN 4 Primary Ash Pond Cell A Primary Ash Pond A None None Significant Fair Currently full of CCW, a channel diverts water toward Pond B. Embankment has not been raised since initial construction. Duke Energy Corp Wabash River Power Station Terre Haute, IN 4 Primary Ash Pond Cell B Primary Ash Pond B None None Significant Fair Duke Energy Corp Wabash River Power Station Terre Haute, IN 4 Secondary Ash Pond Secondary Ash Pond None None Significant Fair Duke Energy Corp Wabash River Power Station Terre Haute, IN 4 South Ash Pond South Ash Pond None None Significant Satisfactory Duke Energy Corp WH Zimmer Generating Station Moscow, OH 4 Wastewater Pond Wastewater Pond Complex Significant Class II (State) Low Satisfactory

Georgia Power Co Plant Scherer Juliette, GA 4 Ash Pond Ash Pond Not classified (State) None Significant Satisfactoryrated poor due to lack of design documentation. NOTE: Georgia Power claiming CBI on all technical data supplied to contractor Georgia Power Co Plant Hammond Coosa, GA 4 Ash Pond 1 Ash Pond 1 None Category II (State) Significant Satisfactory Georgia Power Co Plant McDonough Symra, GA 4 Ash Pond 1 Ash Pond 1 Not classified (State) None Low SatisfactoryPond is inactive and covered Georgia Power Co Plant Mitchell Albany, GA 4 Ash Pond 1 Ash Pond 1 Significant Category II (State) Low SatisfactoryInactive; no longer receives liquid borne waste. Georgia Power Co Plant Yates Newnan, GA 4 Ash Pond 1 Ash Pond 1 Not classified (State) None Low SatisfactoryInactive, does not currently receive CCW (does receive coal pile run off) Georgia Power Co Plant Hammond Coosa, GA 4 Ash Pond 2 Ash Pond 2 None Category II (State) Significant Satisfactory Georgia Power Co Plant McDonough Symra, GA 4 Ash Pond 2 Ash Pond 2 Not classified (State) None Low Satisfactory Georgia Power Co Plant Mitchell Albany, GA 4 Ash Pond 2 Ash Pond 2 Not classified (State) Category II (State) Significant Satisfactory Georgia Power Co Plant Yates Newnan, GA 4 Ash Pond 2 Ash Pond 2 Significant Category II (State) Significant Fair

Georgia Power Co Plant Hammond Coosa, GA 4 Ash Pond 3 Ash Pond 3 Not classified (State) None Low SatisfactoryPond converted to dry disposal area in early 1980s. It is currently full and considered inactive though does contain some liquids from rainfall events. Georgia Power Co Plant McDonough Symra, GA 4 Ash Pond 3 Ash Pond 3 Not classified (State) none Low Satisfactory Georgia Power Co Plant Yates Newnan, GA 4 Ash Pond 3 Ash Pond 3 Significant Category II (State) Low SatisfactoryInactive, does act as sediment control for flow from Ash Pond B' Georgia Power Co Plant Hammond Coosa, GA 4 Ash Pond 4 Ash Pond 4 None Category II (State) Significant Poor Dry stacking facility that no longer receives liquidborne material. Georgia Power Co Plant McDonough Symra, GA 4 Ash Pond 4 Ash Pond 4 High Category I (State) High Satisfactory
Georgia Power Co Plant Mitchell Albany, GA 4 Ash Pond A Ash Pond A Not classified (State) N/A Less than Low N/A Inactive; no longer receives liquid borne waste; pond is covered over with asphalt and concrete Georgia Power Co Plant Yates Newnan, GA 4 B' Pond B' Pond Not classified (State) None Low Satisfactory Georgia Power Co Plant Yates Newnan, GA 4 Gypsum Solid Waste Facility Gypsum Pond Not classified (State) None Low Satisfactory

Georgia Power Co Plant Scherer Juliette, GA 4 Not in database Settling Pond Not classified (State) None Low SatisfactorySettling pond was NOT on the ICR response NOTE: Georgia Power claiming CBI on all technical data supplied to contractor Georgia Power Co Plant Yates Newnan, GA 4 Pond A A Pond Not classified (State) None Less than Low SatisfactoryPond is covered and inactive Georgia Power Co Plant Yates Newnan, GA 4 Pond B B Pond Not classified (State) N/A Less than Low N/A Pond is covered and inactive Georgia Power Co Plant Yates Newnan, GA 4 Pond C C Pond Not classified (State) N/A Less than Low N/A Pond is covered and inactive Indianapolis Power & Light CoEagle Valley Generating Station Martinsville, IN 4 A Pond A Pond None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoEagle Valley Generating Station Martinsville, IN 4 B Pond B Pond None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoEagle Valley Generating Station Martinsville, IN 4 C Pond C Pond None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoEagle Valley Generating Station Martinsville, IN 4 D Pond D Pond None None High Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoEagle Valley Generating Station Martinsville, IN 4 E Pond E Pond None None Significant Poor rated poor due to lack of design documentation.



### Page 5 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Indianapolis Power & Light CoHarding Street Power Station Indianapolis, IN 4 Not in database Ponds 4A/4B None None Low Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoHarding Street Power Station Indianapolis, IN 4 Pond 1 Pond 1 None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoHarding Street Power Station Indianapolis, IN 4 Pond 2 Pond 2 None None High Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoHarding Street Power Station Indianapolis, IN 4 Pond 3 Pond 3 None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoHarding Street Power Station Indianapolis, IN 4 Pond 4 Pond 4 None None High Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoPetersburg Generating Station Petersburg, IN 4 Pond A - Active Pond A - Active None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoPetersburg Generating Station Petersburg, IN 4 Pond A - Discharge Pond A - Discharge None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoPetersburg Generating Station Petersburg, IN 4 Pond B Pond B None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoPetersburg Generating Station Petersburg, IN 4 Pond C Pond C None None Significant Poor rated poor due to lack of design documentation. Indianapolis Power & Light CoHarding Street Power Station Indianapolis, IN 4 Ponds 2A/2B Ponds 2A/2B None None Low Poor rated poor due to lack of design documentation.

Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 FGD Landfill Stormwater Runoff Pond FGD Landfill Stormwater Runoff Pond None None Low Poor Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Final Settling Basin Final Settling Basin None None High Poor Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Material Storage Runoff Basin Material Storage Runoff Basin None None Significant Poor Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Metal Cleaning Waste Basin Metal Cleaning Waste Basin None None Significant Poor Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Not in database Intake Settling Basin None High Poor

Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Not in database Gypsum Storage A None Significant Poor On same site as original Waste Disposal Area; backfilled, but still used as a gypsum storage facility.

Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Not in database Gypsum Storage B None Significant Poor On same site as original Waste Disposal Area; backfilled, but still used as a gypsum storage facility. Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Recycle Basin Recycling Settling Basin None None Significant Poor

Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Waste Disposal Area Waste Disposal Area None None Significant Poor Original Waste Disposal Area (along with Dry Ash Staging Area) was constructed in 1976, backfilled and taken out of service in 1982, though not formally decommissioned. Northern Indiana Pub Serv CoR. M. Schahfer Power Station Wheatfield, IN 4 Yard Drain Stormwater Retention Pond Yard Drain Stormwater Retention Pond None None Low Poor Incised
Sunbury Generation LLC WPS Energy Services Sunbury Generating Station Shamokin Dam, PA 4 Residual Waste Ash Basin No. 1 Residual Waste Ash Basin No. 1 None None High Poor Impoundment has closure plan, but not state approved. Alabama Power Co Greene County Power Station Demopolis, AL 5 Ash Pond Fly Ash Pond None None Significant SatisfactoryEmbankment may contain a strata of fly ash.

Alabama Power Co Ernest C. Gaston Electric Generating Plant Wilsonville, AL 5 Ash Pond Dam West Dike None None High SatisfactoryContractor divided the impoundment into 3 dikesNorth, East and West.

Alabama Power Co Ernest C. Gaston Electric Generating Plant Wilsonville, AL 5 Ash Pond Dam East Dike None None Significant SatisfactoryContractor divided the impoundment into 3 dikesNorth, East and West.

Alabama Power Co Ernest C. Gaston Electric Generating Plant Wilsonville, AL 5 Ash Pond Dam North Dike None None Significant SatisfactoryContractor divided the impoundment into 3 dikesNorth, East and West. Alabama Power Co Barry Power Station Bucks, AL 5 Barry Ash Pond Barry Ash Pond None None Significant Satisfactory

American Electric Power Southwestern Electric Power Co - Welsh Plant Pittsburg, TX 5 Active Bottom Ash Storage Active Bottom Ash Storage None None Low SatisfactoryRated POOR based on the lack of critical studies and investigations available to the assessors to determine the structural soundness of the dams and potential for dam safety deficiencies.

American Electric Power Southwestern Electric Power Co - Welsh Plant Pittsburg, TX 5 Primary Ash Pond Primary Ash Pond None None Low SatisfactoryRated POOR based on the lack of critical studies and investigations available to the assessors to determine the structural soundness of the dams and potential for dam safety deficiencies.



### Page 6 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes

American Electric Power Southwestern Electric Power Co - Welsh Plant Pittsburg, TX 5 Secondary Ash Pond Secondary Ash Pond None None Low SatisfactoryRated POOR based on the lack of critical studies and investigations available to the assessors to determine the structural soundness of the dams and potential for dam safety deficiencies.
Cleco Power LLC Rodemacher Power Station Lena, LA 5 Bottom Ash Pond Bottom Ash Pond None None Significant Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation.
Cleco Power LLC Rodemacher Power Station Lena, LA 5 Fly Ash Pond Fly Ash Pond None None Significant Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation.
Cleco Power LLC Rodemacher Power Station Lena, LA 5 Not in database Leachate Pond None Low Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation.
Coleto Creek Power, LP Coleto Creek Power Station Fannin, TX 5 Primary Ash Pond Primary Ash Pond None None Low Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation.
Coleto Creek Power, LP Coleto Creek Power Station Fannin, TX 5 Secondary Ash Pond Secondary Ash Pond None None Low Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation. Duke Energy Corp W. S. Lee Power Station Pelzer, SC 5 Primary Active Ash Pond Primary Active Ash Pond None None Significant Fair Duke Energy Corp W. S. Lee Power Station Pelzer, SC 5 Secondary Ash Pond Secondary Ash Basin None None Significant Fair Georgia Power Co Plant Wansley Carrolton, GA 5 Ash Pond Ash Pond Low Category II (State) Low SatisfactorySlope stability analyses were not provided for the western dike. Gulf Power Lansing Smith Power Station Pensacola, FL 5 Plant Smith Ash Pond Ash Pond None None Low Satisfactory Louisiana Generating LLC Big Cajun 2 Power Station New Roads, LA 5 Bottom Ash Unit Bottom Ash Pond None None Low Fair Louisiana Generating LLC Big Cajun 2 Power Station New Roads, LA 5 Fly Ash Unit Fly Ash Pond None None Low Fair Louisiana Generating LLC Big Cajun 2 Power Station New Roads, LA 5 Water Treatment Unit Water Treatment Ponds None None Low Fair Lower Colorado River AuthorityFayette Power Project Power Station La Grange, TX 5 Management Unit 002 Coal Ash Pond None None Low Satisfactory
Lower Colorado River AuthorityFayette Power Project Power Station La Grange, TX 5 Management Unit 009 Reclaim Pond None None Low Poor Unit appears to be in fair condition based on site observation, but rated poor due to lack of design documentation. Mississippi Power Co Plant Jack Watson Gulfport, MS 5 Ash Pond Ash Pond None Low (State) Significant Satisfactory Power South Energy Cooperative Charles R. Lowman Power Station Leroy, AL 5 FGD Scrubber Waste Pond None None Significant Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation. Power South Energy Cooperative Charles R. Lowman Power Station Leroy, AL 5 Not in database Process Waste Pond N/A None Significant Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation. Power South Energy Cooperative Charles R. Lowman Power Station Leroy, AL 5 Unit 1 Ash Pond #1 Bottom Ash Pond None None Significant Fair Power South Energy Cooperative Charles R. Lowman Power Station Leroy, AL 5 Units 2-3 Pond #2/#3 Bottom Ash Ponds None None Significant Poor Units appear to be in fair condition based on site observation, but rated poor due to lack of design documentation. Santee Cooper (South Carolina Pub Serv Auth) Dolphus M. Grainger Power Station Conway, SC 5 Ash Pond 1 Ash Pond 1 None None Less than low N/A Used to store dry waste only, continually dewatered. Santee Cooper (South Carolina Pub Serv Auth) Dolphus M. Grainger Power Station Conway, SC 5 Ash Pond 2 Ash Pond 2 None None Low SatisfactoryOnly active impoundment onsite. Santee Cooper (South Carolina Pub Serv Auth) Jefferies Power Station Moncks Corner, SC 5 Ash Pond A Ash Pond A None None Significant Fair Concern: Satisfactor rating, with no documentation, but significant hazard Santee Cooper (South Carolina Pub Serv Auth) Winyah Power Station Georgetown, SC 5 Ash Pond A Ash Pond A None None Low Fair No construction or geotechnical information given to contractor Santee Cooper (South Carolina Pub Serv Auth) Jefferies Power Station Moncks Corner, SC 5 Ash Pond B Ash Pond B None None Low Fair Santee Cooper (South Carolina Pub Serv Auth) Winyah Power Station Georgetown, SC 5 Ash Pond B Ash Pond B None None Low Fair No construction or geotechnical information given to contractor Santee Cooper (South Carolina Pub Serv Auth) Winyah Power Station Georgetown, SC 5 Slurry Pond 2 Slurry Pond 2 None None Significant Fair No construction or geotechnical information given to contractor Santee Cooper (South Carolina Pub Serv Auth) Winyah Power Station Georgetown, SC 5 South Ash Pond South Ash Pond None None Significant Fair No construction or geotechnical information given to contractor Santee Cooper (South Carolina Pub Serv Auth) Winyah Power Station Georgetown, SC 5 Unit 3 & 4 Slurry Pond Unit 3 & 4 Slurry Pond None None Significant Fair No construction or geotechnical information given to contractor Santee Cooper (South Carolina Pub Serv Auth) Winyah Power Station Georgetown, SC 5 West Ash Pond West Ash Pond None None Significant Fair No construction or geotechnical information given to contractor South Carolina Electric&Gas Co Wateree Generating Station Eastover, SC 5 Ash Pond 1 Ash Pond 1 None None Low SatisfactoryNo data on the embankment material used at construction, but later core borigs are available



### Page 7 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes South Carolina Electric&Gas Co Wateree Generating Station Eastover, SC 5 Ash Pond 2 Ash Pond 2 None None Low SatisfactoryNo data on the embankment material used at construction, but later core borigs are available Ameren Energy Generating CoE. D. Edwards Power Station Bartonville, IL 6 Ash Pond Ash Pond None None Significant Fair Ameren Energy Generating Co Duck Creek Power Station Canton, IL 6 Ash Pond 1 Fly Ash Pond 1 None Significant (by Company), None by State Low Fair Ameren Energy Generating Co Duck Creek Power Station Canton, IL 6 Ash Pond 2 Fly Ash Pond 2 None Low- State rating Low Fair Ameren Energy Generating Co Meredosia Power Station Meredosia, IL 6 Bottom Ash Pond Bottom Ash Pond None None Significant Fair Ameren Energy Generating Co Meredosia Power Station Meredosia, IL 6 Fly Ash Pond Fly Ash Pond None None Significant Fair Ameren Energy Generating Co Coffeen Power Station Montgomery County, IL 6 Gypsum Management Facility Recycle Pond Gypsum Reclaim Pond None None Significant Fair Ameren Energy Generating Co Duck Creek Power Station Canton, IL 6 not in database Recycle Pond Low- State rating Low Fair Ameren Energy Generating CoE. D. Edwards Power Station Bartonville, IL 6 Not in database Cooling Pond None None Significant Fair Ameren Energy Generating CoE. D. Edwards Power Station Bartonville, IL 6 Not in database Clarification Pond None None Significant Fair Ameren Energy Generating Co Newton Power Station Newton, IL 6 Primary Ash Pond Primary Ash Pond None None Significant Fair Ameren Energy Generating Co Coffeen Power Station Montgomery County, IL 6 Recycle Pond Recycle Pond None None Significant Fair Ameren Energy Generating Co Newton Power Station Newton, IL 6 Secondary Ash Pond Secondary Ash Pond None None Significant Fair American Electric Power IN MI Power Co - Rockport Power Station Rockport, IN 6 Bottom Ash Complex Bottom Ash Complex None None Low Satisfactory City of Springfield Dallman Power Station Springfield, IL 6 Dallman Ash Pond Dallman Ash Pond None None Significant Fair City of Springfield Lakeside Power Station Springfield, IL 6 Lakeside Ash Pond Lakeside Ash Pond Low Low Significant Fair Dayton Power & Light Co O.H. Hutchings Station Miamisburg, OH 6 East Primary Settling Pond East Primary Settling Pond None None Significant Poor Dayton Power & Light Co O.H. Hutchings Station Miamisburg, OH 6 Secondary Settling Pond Secondary Settling Pond None None Significant Poor Dayton Power & Light Co O.H. Hutchings Station Miamisburg, OH 6 West Primary Settling Pond West Primary Settling Pond None None Significant Poor Dominion Kincaid Power Station Kincaid, IL 6 Kincaid Slagfield Berm Kincaid Slagfield Berm None None Low Fair Duke Energy Corp Cayuga Power Station Cayuga, IN 6 Ash Disposal Area #1 Ash Disposal Area #1 None None Significant Poor Duke Energy Corp East Bend Power Station Rabbit Hash, KY 6 Ash Pond Ash Pond None None Significant Poor Duke Energy Corp R. Gallagher Power Station New Albany, IN 6 Ash Pond A Ash Pond A None None Significant Fair Duke Energy Corp East Bend Power Station Rabbit Hash, KY 6 FGD Pond East FGD Pond East None None unit not assessed unit not assessed Duke Energy Corp East Bend Power Station Rabbit Hash, KY 6 FGD Pond West FGD Pond West None None unit not assessed unit not assessed Duke Energy Corp Cayuga Power Station Cayuga, IN 6 Lined Ash Disposal Pond - Cell #1 Lined Ash Disposal Pond - Cell #1 None None Significant Poor Duke Energy Corp Edwardsport Generating Station Edwardsport, IN 6 Primary Ash Pond Primary Ash Pond None None Significant Fair Duke Energy Corp Cayuga Power Station Cayuga, IN 6 Primary Ash Settling Basin Primary Ash Settling Basin None None Significant Poor Duke Energy Corp Edwardsport Generating Station Edwardsport, IN 6 Secondary Ash Pond Secondary Ash Pond None None Significant Fair Duke Energy Corp R. Gallagher Power Station New Albany, IN 6 Secondary Ash Pond Secondary Ash Pond None None Low Fair Duke Energy Corp Cayuga Power Station Cayuga, IN 6 Secondary Ash Settling Basin Secondary Ash Settling Basin None None Low Poor Dynegy Midwest Generation Inc Vermilion Power Station Oakwood, IL 6 East Ash Pond (2 cells) East Ash Pond None None Significant Satisfactory Dynegy Midwest Generation Inc Vermilion Power Station Oakwood, IL 6 North Ash Pond Unit not assessed Unit not assessed East Kentucky Power Coop Inc Dale Power Station Winchester, KY 6 Dale Ash Pond #2 Dale Ash Pond #2 None None Significant Fair
East Kentucky Power Coop Inc Dale Power Station Winchester, KY 6 Dale Ash Pond #4 Dale Ash Pond #3 N/A N/A Significant Fair Dale Ash Pond #3 notlisted in the 104(e) response, however, EKPC considers ash pond 3 part of ash pond 2 East Kentucky Power Coop Inc Dale Power Station Winchester, KY 6 Not in database Dale Ash Pond #4 Low Low Significant Fair Hoosier Energy R E C Inc Frank E. Ratts Power Station Petersburg, IN 6 Bottom Ash Pond Bottom Ash Pond/Pond 4 None None Significant Poor Hoosier Energy R E C Inc Frank E. Ratts Power Station Petersburg, IN 6 Fly Ash Pond 1 Fly Ash Pond 1 None None Low Poor



### Page 8 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Hoosier Energy R E C Inc Frank E. Ratts Power Station Petersburg, IN 6 Fly Ash Pond 2 Fly Ash Pond 2 None None Less than low Poor Hoosier Energy R E C Inc Frank E. Ratts Power Station Petersburg, IN 6 Fly Ash Pond 3 Fly Ash Pond 3 None None Less than low Poor

Kentucky Utilities Co Pineville Station Pineville, KY 6 Ash Pond Ash Pond None None Low SatisfactoryAsh Pond has not received CCW since plant operations were discontinued in 2001. Two piezometersa installed in August 2010, no data colleted at time of site assessment Kentucky Utilities Co Tyrone Power Station Versailles, KY 6 Ash Pond Ash Pond Low Low Significant Fair Kentucky Utilities Co Green River Power Station Central City, KY 6 Ash Pond Number 2 Ash Pond Number 2 None None Significant Poor Piezometers recently installed, no data yet
Kentucky Utilities Co Tyrone Power Station Versailles, KY 6 Finishing Pond Former Secondary Pond None None N/A Not rated- see notethis pond no longer receives liquid-borne material(as of May 2010); the dikes of this pond have been graded; Kentucky Utilities Co Green River Power Station Central City, KY 6 Finishing Pond Number 3 Finishing Pond Number 3 None None N/A Not rated- see noteContractor did not rate-taken out of service in 2010, but not officially closed out Kentucky Utilities Co Green River Power Station Central City, KY 6 Former Ash Pond Former Ash Pond Low Low Significant Poor Kentucky Utilities Co Green River Power Station Central City, KY 6 Main Ash Pond Main Ash Pond None None Significant Fair 10 piezometers were installed in 2010 (July and August) Kentucky Utilities Co Green River Power Station Central City, KY 6 Scrubber Pond Scrubber Pond Low Low Significant Fair Vectren F. B. Culley Power Station Newburgh, IN 6 East Pond East Pond None None Significant Fair and, the contained material has been removed. Vectren F. B. Culley Power Station Newburgh, IN 6 West Pond West Pond None None Significant Fair Allete Inc Syl Laskin Power Station Aurora, MN 7 Cell E Cell E None Significant (Class II) - State Significant Satisfactory
Allete Inc Syl Laskin Power Station Aurora, MN 7 Cells A, B, C & D (retired) Cells A, B, C & D (retired) None None Less than Low Fair Cells C and D were decommissioned in 1964; Cells A and B were decomissioned in 2000.
Alliant Energy Interstate Power & Light Co - Burlington Generating Station Burlington, IA 7 Ash Seal Pond Ash Seal Pond None None Low SatisfactoryRated "Poor" due to lack of technical documentation.
Alliant Energy Interstate Power & Light Co - Burlington Generating Station Burlington, IA 7 Economizer Ash Pond Economizer Ash Pond None None Low SatisfactoryRated "Poor" due to lack of technical documentation. Alliant Energy Columbia Power Station Pardeeville, WI 7 Landfill Storm Water Pond Landfill Storm Water Pond None None Low Fair

Alliant Energy Interstate Power & Light Co - Burlington Generating Station Burlington, IA 7 Lower Ash Pond Ash Pond 2/Lower Ash Pond None None Low Not rated- see notePond was inundated by the Mississippi River during assessment. The Lower Ash Pond receives overflow water and clarified water from the Upper Ash Pond. It therefore receives minimal amounts of ash, which is a good thing, since every year or so it gets “cleaned out” when the Mississippi River overflows the 3-foot (!) dikes. It essentially is designed as a flood surge pond. Since however it receives clarified water from the Upper Ash Pond it receives small amounts of ash and is therefore included in the report. As you see in Appendix C it has a Low Hazard rating since there is essentially no ash in it – only clarified water. Dewberry did not discuss it much in the report because they couldn’t see it, and the very low dikes are unlikely to fail catastrophically – and wouldn’t matter much if they did. Alliant Energy Lansing Power Station Lansing, IA 7 Lower Ash Pond Ash Pond 2 None None Low Satisfactory
Alliant Energy Interstate Power & Light Co - Burlington Generating Station Burlington, IA 7 Main Ash Pond Main Ash Pond/Bottom Ash Pond None None Low SatisfactoryRated "Poor" due to lack of technical documentation.
Alliant Energy Interstate Power & Light Co - Ottumwa Generating Station Ottumwa, IA 7 Main Ash Pond Ash Pond 1 None None Low Satisfactory Alliant Energy Lansing Power Station Lansing, IA 7 Main Ash Pond Ash Pond 1 None None Low Satisfactory Alliant Energy Columbia Power Station Pardeeville, WI 7 Polishing Pond Polishing Pond None None Less than Low Satisfactory Deactivated in 2004. Alliant Energy Columbia Power Station Pardeeville, WI 7 Primary Ash Pond Primary Ash Pond None None Significant Satisfactory Alliant Energy Columbia Power Station Pardeeville, WI 7 Secondary Ash Pond Secondary Ash Pond None None Significant Satisfactory Deactivated in 2004
Alliant Energy Interstate Power & Light Co - Burlington Generating Station Burlington, IA 7 Upper Ash Pond Upper Ash Pond/Ash Pond 1 None None Low SatisfactoryRated "Poor" due to lack of technical documentation.



### Page 9 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes
Alliant Energy Interstate Power & Light Co - Ottumwa Generating Station Ottumwa, IA 7 Zero Liquid Discharge Pond Ash Pond 2 None None Low Satisfactory Ameren UE Rush Island Power Station Festus, MO 7 Ash Pond Ash Pond None None Low Satisfactory Ameren UE Sioux Power Station West Alton, MO 7 Bottom Ash Pond None None Significant Satisfactory Ameren UE Meramec Power Station St. Louis, MO 7 Bottom Ash Pond (3) Bottom Ash Pond #493 (Pond 4) None None Low Poor Ameren UE Meramec Power Station St. Louis, MO 7 Bottom Ash Pond (3) Bottom Ash Pond #492 (Pond 5) None None Low Poor Ameren UE Meramec Power Station St. Louis, MO 7 Bottom Ash Pond (3) Bottom Ash Pond #496 (Pond 6) None None Low Poor Ameren UE Sioux Power Station West Alton, MO 7 Fly Ash Pond None None Low Satisfactory Ameren UE Meramec Power Station St. Louis, MO 7 New Fly Ash Pond #498 (Pond 3) None None Low Poor Ameren UE Meramec Power Station St. Louis, MO 7 Old Fly Ash Pond #489 (Pond 2) None None Low Poor Ameren UE Meramec Power Station St. Louis, MO 7 Retention Pond Pond 1 None None Low Poor

Ameren UE Meramec Power Station St. Louis, MO 7 Fly Ash Pond #494 (Pond 7), Fly Ash Pond #495 (Pond 8), Fly Ash Pond #490 (Pond 9), and Fly Ash Pond #491 (Pond 10) Not rated- see note Ponds 7 and 8 are filled to capacity by fly ash and

are no longer active. Incised ponds, Pond 9 and Pond 10, are deactivated and are currently supporting plant structures and activity. Associated Electric Coop Inc New Madrid Power Station Marston, MO 7 Ash Pond 1 Ash Pond 1 None None Low Fair Associated Electric Coop Inc New Madrid Power Station Marston, MO 7 Ash Pond 2 Ash Pond 2 None None Low Fair Associated Electric Coop Inc New Madrid Power Station Marston, MO 7 Slag Pond 1 Slag Pond 1 None None Significant Fair Associated Electric Coop Inc New Madrid Power Station Marston, MO 7 Slag Pond 2 Slag Pond 2 None None Significant Fair Basin Electric Power Coop Leland Olds Power Station Stanton, ND 7 Settling Pond #1 Former Ash Pond #1 None None Significant Poor been decommissioned and is now used for dry ash storage Basin Electric Power Coop Leland Olds Power Station Stanton, ND 7 Settling Pond #2 Ash Pond #2 None None Significant Poor Basin Electric Power Coop Leland Olds Power Station Stanton, ND 7 Settling Pond #3 Ash Pond #3 None None Significant Poor Consumers Energy Co J C Weadock Generating Plant Essexville, MI 7 East 7 & 8 Ponds None None
Consumers Energy Co J C Weadock Generating Plant Essexville, MI 7 Not in database Weadock Landfill Embankment None None Low SatisfactoryIn February 2009, the fly ash disposal process was converted to a “dry” operation. Consumers Energy Co J C Weadock Generating Plant Essexville, MI 7 Not in database J.C. Weadock Fly Ash Dam None None Low SatisfactoryFacility converted to dry fly ash handling system in Feb. 2009. Consumers Energy Co J. R. Whiting Power Station Erie, MI 7 Pond 1 Pond 1 None None Significant Fair Consumers Energy Co J. R. Whiting Power Station Erie, MI 7 Pond 2 Pond 2 None None Significant Fair Consumers Energy Co J. R. Whiting Power Station Erie, MI 7 Pond 6 Pond 6 Low Low (State) Significant Fair

Consumers Energy Co Dan E Karn Generating Plant Essexville, MI 7 Pond A Karn Disposal Area None None Low SatisfactoryRegulated as a Type III landfill in Michigan, not a dam. The disposal area encompasses what was formerly known as Pond A. Fly ash from Karn currently disposed in Weadock Disposal facility. Consumers Energy Co J. R. Whiting Power Station Erie, MI 7 Ponds 3-5 Not assessed. None None N/A Recently closed, in the process of being filled and capped. Consumers Energy Co J C Weadock Generating Plant Essexville, MI 7 West A - E Ponds None None Detroit Edison Co Monroe Power Station Monroe, MI 7 Bottom Ash Basin Bottom Ash Stormwater Pond None None Low Satisfactory Detroit Edison Co Monroe Power Station Monroe, MI 7 Fly Ash Basin Fly Ash Basin None None Significant SatisfactoryRegulated as a Type III landfill in Michigan, not a dam. Empire District Electric Co Riverton Power Station Riverton, KS 7 Landfill Unit Ash Disposal Pond None None Significant Poor

Kansas City Board of Public Utilities Nearman Creek Power Station Kansas City, KS 7 N/A bottom ash settling pond and a clear water pond None None Low Poor The management unit is divided into two cells by an internal clay berm. The northern cell operates as a primary ash settling basin. The eastern cell operates as a clear water basin. The cells are hydraulically connected by a 24” RCP through the eastern section of the internal dike.



### Page 10 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes

Kansas City Power & Light Co LaCygne Generating Station LaCygne, KS 7 Bottom Ash Settling Pond Not assessed. None None N/A Not assessedPond was determined to be incised into the site. Since it was incised, further evaluation of the unit was not performed. Kansas City Power & Light Co Sibley Generating Station Sibley, MO 7 Fly Ash Settling Pond Fly Ash Pond None None Low Satisfactory Kansas City Power & Light Co LaCygne Generating Station LaCygne, KS 7 Scrubber Sludge Ponds Upperand Lower AQC Ponds None None Low Satisfactory Kansas City Power & Light Co LaCygne Generating Station LaCygne, KS 7 Scrubber Sludge Ponds Upper andLowerAQC Ponds None None Low Satisfactory Kansas City Power & Light Co Sibley Generating Station Sibley, MO 7 Slag Settling Pond Not assessed. None None since the pond was incised no dike assessment was required. MidAmerican Energy Co Louisa Power Station Muscatine, IA 7 Louisa Surface Impoundment Bottom Ash Pong None None Low Satisfactory
MidAmerican Energy Co Riverside Generating Station Bettendorf, IA 7 North Surface Impoundment North Ash Pond None None Low SatisfactoryInactive and no longer receives coal combustion wastes. Recommended to be deactivated. MidAmerican Energy Co Walter Scott Junior Energy Center IA 7 North Surface Impoundment North Ash Pond or Ash Pond 2 None None Low Satisfactory MidAmerican Energy Co Riverside Generating Station Bettendorf, IA 7 South Surface Impoundment South Ash Pond None None Low Poor MidAmerican Energy Co Walter Scott Junior Energy Center IA 7 South Surface Impoundment South Ash Pond or Ash Pond 1 None None Low Satisfactory MidAmerican Energy Co George Neal North Power Station Sioux City, IA 7 Surface Impoundment 1 Pond 1 None None Low Satisfactory MidAmerican Energy Co George Neal North Power Station Sioux City, IA 7 Surface Impoundment 2 Pond 2 None None Low Satisfactory MidAmerican Energy Co George Neal North Power Station Sioux City, IA 7 Surface Impoundment 3Ponds 3A, 3B North, and 3B South None None Low Satisfactory Northern States Power Co Black Dog Power Station Burnsville, MN 7 Settling Ponds 1-4 None None Low Fair

Westar Energy Lawrence Energy Center Lawrence, KS 7 Area 1 Area 1, Clear Water Pond, North Dike None None Significant SatisfactorySince all four of the pond areas are encompassed by a perimeter dike, the Dewberry engineers consider them all part of one large impoundment containing several cells separated by internal

dikes. Westar Energy Lawrence Energy Center Lawrence, KS 7 Area 2 Area 2, South Dike None None Significant Satisfactory Westar Energy Lawrence Energy Center Lawrence, KS 7 Area 3 Area 3, West Dike, South Dike None None Significant Satisfactory Westar Energy Lawrence Energy Center Lawrence, KS 7 Area 4 Area 4, North Dike, Northwest Dike None None Significant Satisfactory
Alliant Energy Interstate Power & Light Co - M.L. Kapp Generating Station Clinton, IA 8 Emergency Ash Primary Settling Pond Emergency Ash Primary Settling Pond None None Low Poor
Alliant Energy Interstate Power & Light Co - M.L. Kapp Generating Station Clinton, IA 8 Emergency Ash Secondary Settling Pond Emergency Ash Secondary Settling Pond None None Low Poor
Alliant Energy Interstate Power & Light Co - M.L. Kapp Generating Station Clinton, IA 8 Main Ash Primary Settling Pond Main Ash Primary Settling Pond None None Low Poor
Alliant Energy Interstate Power & Light Co - M.L. Kapp Generating Station Clinton, IA 8 Main Ash Secondary Settling Pond Main Ash Secondary Settling Pond None None Low Poor Ameren UE Labadie Power Station Labadie, MO 8 Bottom Ash Pond Bottom Ash Pond None None Low Fair Ameren UE Labadie Power Station Labadie, MO 8 Fly Ash Pond Fly Ash Pond None None Low Fair Fly Ash dry handled, but this pond is used when no market exists for re-used fly ash

American Electric Power Southwestern Electric Power Co - Pirkey Power Station Hallsville, TX 8 Auxilliary Surge Pond Auxilliary Surge Pond None None Low Fair

American Electric Power Southwestern Electric Power Co - Pirkey Power Station Hallsville, TX 8 East Bottom Ash Pond East Bottom Ash Pond None None Low Satisfactory

American Electric Power Southwestern Electric Power Co - Pirkey Power Station Hallsville, TX 8 Scrubber Sludge Landfill Runoff Pond Scrubber Sludge Landfill Runoff Pond None None Low Poor

American Electric Power Southwestern Electric Power Co - Pirkey Power Station Hallsville, TX 8 Secondary Bottom Ash Pond Secondary Bottom Ash Pond None None Low Satisfactory

American Electric Power Southwestern Electric Power Co - Pirkey Power Station Hallsville, TX 8 Surge Pond Surge Pond None None Low Satisfactory



### Page 11 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes

American Electric Power Southwestern Electric Power Co - Pirkey Power Station Hallsville, TX 8 West Bottom Ash Pond West Bottom Ash Pond None None Low Fair Associated Electric Coop Inc Thomas Hill Energy Center Thomas Hill, MO 8 Ash - 2 Landfill Not assessed None None Regulated as landfill. Associated Electric Coop Inc Thomas Hill Energy Center Thomas Hill, MO 8 Ash -3 Landfill Not assessed None None Regulated as landfill. Associated Electric Coop Inc Thomas Hill Energy Center Thomas Hill, MO 8 Ash Pond Cell 1 - Upper Not assessed None None Dry CCR storage only. Associated Electric Coop Inc Thomas Hill Energy Center Thomas Hill, MO 8 Ash Pond Cell 2 - Middle Ash Pond - Cell No. 2 None None Low Satisfactory Associated Electric Coop Inc Thomas Hill Energy Center Thomas Hill, MO 8 Ash Pond Cell 3 - Lowest Not assessed None None Decant water storage only. Associated Electric Coop Inc Thomas Hill Energy Center Thomas Hill, MO 8 Ash Pond Slag Dewatering Slag Dewatering Basin None None Low Fair Basin Electric Power Coop Antelope Valley Station Beulah, ND 8 Decant Pond (Temporary Pond) Spray Drier Ash Decantation Pond None None Low Fair Basin Electric Power Coop Antelope Valley Station Beulah, ND 8 Spray Drier Ash Water Make-Up Pond Spray Drier Ash Water Make-Up Pond None None Low Fair City of Independence Blue Valley Power Station Independence, MO 8 Bottom Ash Pond Bottom Ash Pond None None Low Fair City of Independence Blue Valley Power Station Independence, MO 8 North Fly Ash Pond North Fly Ash Pond None None Low Fair 2008 taken out of service City of Independence Blue Valley Power Station Independence, MO 8 South Fly Ash Pond South Fly Ash Pond None None Low Fair 1991 taken out of service City of Los Angeles Intermountain Power Project Delta, UT 8 Ash Water Recycle Ash Recycle Basin None Low (State) Not assessed Not assessed City of Los Angeles Intermountain Power Project Delta, UT 8 Bottom Ash Basin Bottom Ash Basin #1, #2, #3 None Low (State) Low Fair City of Los Angeles Intermountain Power Project Delta, UT 8 Evaporation Ponds (6 Ponds) Evaporation Ponds (6 Ponds) None Low (State) Not assessed Not assessed City of Los Angeles Intermountain Power Project Delta, UT 8 Land Fill Run-Off Land Fill Run-Off Basin None Low (State) Not assessed Not assessed City of Los Angeles Intermountain Power Project Delta, UT 8 Settling Basin Settling Basin None Low (State) Not assessed Not assessed City of Los Angeles Intermountain Power Project Delta, UT 8 Wastewater Holding Basin Wastewater Holding Basin None Low (State) Low Fair Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Ash Basin No. 1 Ash Pond 1 None Low (State) Low Fair Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Ash Basin No. 2 Ash Pond 2 None Low (State) Low Fair Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Auxiliary Surge Pond Auxiliary Surge Pond None None Low Satisfactory Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Not in database Fly Ash/FGD Landfill Pond None None Low Poor Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Secondary Basin Secondary Ash Pond None Low (State) Low Poor Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Surge Pond Surge Pond 1 None None Low Poor Cleco Power LLC Dolet Hills Power Station Mansfield, LA 8 Surge Pond No. 2 Surge Pond 2 None None Low Poor
Empire District Electric Co Asbury Power Station Asbury, MO 8 Ash Impoundment (includes all ponds in the database) Lower Pond None None Significant Poor Rated poor due to lack of technical documentation.

Empire District Electric Co Asbury Power Station Asbury, MO 8 Not in database (considered together as "Ash Impoundment") Upper Pond None None Low Poor Rated poor due to lack of technical documentation.

Empire District Electric Co Asbury Power Station Asbury, MO 8 Not in database (considered together as "Ash Impoundment") South Pond None None Low Poor Rated poor due to lack of technical documentation. Minnkota Power Coop Inc Milton R. Young Power Station Center, ND 8 30 Year Ponds (Cell 2) Cell 2 None Significant Satisfactory
Minnkota Power Coop Inc Milton R. Young Power Station Center, ND 8 Horseshoe Pit Evaporation Pond Not assessed, does not received sluiced ash or other CCW. None Not assessed, does not received sluiced ash or other CCW. Minnkota Power Coop Inc Milton R. Young Power Station Center, ND 8 Not in database Cell 1 None Significant Satisfactory Minnkota Power Coop Inc Milton R. Young Power Station Center, ND 8 Unit 1 Alternative Bottom Ash Pond Alternate Bottom Ash Pond None Low Fair



### Page 12 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes

PacifiCorp Dave Johnston Power Station Glenrock, WY 8 1A Ash Pond 1A Ash Pond None None Partially abandoned, filled, used for lay-down yard - not assessed. Impoundment is contained by natural cut slopes or divider dikes that are not expected to result in a release of CCW to the environment upon failure PacifiCorp Dave Johnston Power Station Glenrock, WY 8 1A Clear Pond 1A Clear Pond None None Significant Poor

PacifiCorp Dave Johnston Power Station Glenrock, WY 8 1B Ash Pond 1B Ash Pond None None Not assessed because impoundment is contained by natural cut slopes or divider dikes that are not expected to result in a release of CCW to the environment upon failure

PacifiCorp Dave Johnston Power Station Glenrock, WY 8 1B Clear Pond 1B Clear Pond None None Significant Poor PacifiCorp Dave Johnston Power Station Glenrock, WY 8 4 Clear Pond 4 Clear Pond None None Low Poor PacifiCorp Dave Johnston Power Station Glenrock, WY 8 4A Ash Pond 4A Ash Pond None None Low Poor PacifiCorp Dave Johnston Power Station Glenrock, WY 8 4B Ash Pond 4B Ash Pond None None Low Poor PacifiCorp Wyodak Power Station Gillette, WY 8 Ash Pond North Pit Ash Pond None None Less than Low Satisfactory PacifiCorp Dave Johnston Power Station Glenrock, WY 8 Blowdown Canal Blowdown Canal None None Subsurface canal, not above grade, not assessed. Westar Energy Tecumseh Energy Center Tecumseh, KS 8 Area 1 (NPDES Ash Pond) Area 1 Pond None None Significant Fair Westar Energy Tecumseh Energy Center Tecumseh, KS 8 Area 2 (Clear Pond) Area 2 Pond None None Low Satisfactory Western Farmers Elec Coop Inc Hugo Power Station Fort Towson, OK 8 North Bottom Ash Unit North Bottom Ash Unit None None Low Poor Western Farmers Elec Coop Inc Hugo Power Station Fort Towson, OK 8 North Fly Ash North Fly Ash None None Low Poor Western Farmers Elec Coop Inc Hugo Power Station Fort Towson, OK 8 South Bottom Ash South Bottom Ash None None Low Poor Western Farmers Elec Coop Inc Hugo Power Station Fort Towson, OK 8 South Fly Ash Unit South Fly Ash Unit None None Low Poor
Alabama Power Co James H. Miller Jr. Power Station Quinton, AL 9 Ash Pond (NID #1101) Main Dike (Dam) Low Significant Satisfactory
Alabama Power Co James H. Miller Jr. Power Station Quinton, AL 9 Ash Pond (NID #1101) Saddle Dike Low Satisfactory Alabama Power Co Gadsden Power Station East Gadsden, AL 9 Ash Pond (NID #1428) Gadsen Plant Ash Pond Low None Significant Satisfactory

American Electric Power Appalachian Power Co - Glen Lyn Power Station Glen Lyn, VA 9 Bottom Ash Pond Bottom Ash Pond Low Class III (State) Low Fair Instrumentation including piezometers and observation wells were installed at the Fly Ash Pond and Bottom Ash Pond as temporary measures to collect data for use in the slope stability analyses for each pond. A continuous record of observations from these instruments is not tracked
American Electric Power OK Public Service Co - Northeastern 3 & 4 Plant Oologah, OK 9 Bottom Ash Pond Bottom Ash Basin None low poor
American Electric Power Appalachian Power Co - Clinch River Carbo, VA 9 Bottom Ash Pond 1A/1B Ash Pond 1 (Ponds 1A/1B) Low Class III (State) Significant Fair

American Electric Power Appalachian Power Co - Clinch River Carbo, VA 9 Bottom Ash Pond 2 Ash Pond 2 Inactive Low Class III (State) Significant Poor *slope stability analysis completed by BBC&M Engineering in 2008 cannot be used for the purpose of this report based on design parameters used and inappropriate assumptions concerning saturated ash levels.

American Electric Power Appalachian Power Co - Glen Lyn Power Station Glen Lyn, VA 9 Fly Ash Pond Auxilary Fly Ash Pond Low Class III (State) Low Fair Instrumentation including piezometers and observation wells were installed at the Fly Ash Pond and Bottom Ash Pond as temporary measures to collect data for use in the slope stability analyses for each pond. A continuous record of observations from these instruments is not tracked



### Page 13 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes

American Electric Power OK Public Service Co - Oklaunion Power Station Vernon, TX 9 Pond #23 Not assessed- incised None

American Electric Power OK Public Service Co - Oklaunion Power Station Vernon, TX 9 Pond #6 Waste Water Evaporation Pond #6 None none low SatisfactoryPond #6 scheduled to be closed.

American Electric Power Southwestern Electric Power Co - Flint Creek Power Station Gentry, AR 9 Primary Bottom Ash Pond Primary Bottom Ash Pond None low satisfactory

American Electric Power Southwestern Electric Power Co - Flint Creek Power Station Gentry, AR 9 Secondary Bottom Ash Pond Secondary Bottom Ash Pond None low satisfactory

American Electric Power OK Public Service Co - Oklaunion Power Station Vernon, TX 9 Sludge Pond Not assessed- incised None Duke Energy Corp Cliffside Power Station Mooresboro, NC 9 Active Pond Upstream Embankment Low Significant Satisfactory Duke Energy Corp Cliffside Power Station Mooresboro, NC 9 Active Pond Downstream Embankment Low Significant Satisfactory Duke Energy Corp Cliffside Power Station Mooresboro, NC 9 Retired Unit 1-4 Basin Unit not assessed not assessed Duke Energy Corp Cliffside Power Station Mooresboro, NC 9 Retired Unit 5 Basin Unit not assessed not assessed East Kentucky Power Coop Inc H. L. Spurlock Power Station Maysville, KY 9 Spurlock Ash Pond Spurlock Ash Pond Low Low (State) Low satisfactory Georgia Power Co McIntosh Power Station Rincon, GA 9 Ash Pond Ash Pond None Category II (State) low satisfactory Georgia Power Co Kraft Power Station Port Wentworth, GA 9 Ash Pond Ash Pond None low satisfactory Kansas City Power & Light Co Montrose Generating Station Clinton, MO 9 Ash Settling Pond South Ash Pond None Less than Low Satisfactory Kansas City Power & Light Co Montrose Generating Station Clinton, MO 9 Ash Settling Pond North Ash Pond None Less than Low Satisfactorycompany survey response only includes on unit, contractor assessed two.

Kansas City Power & Light Co Lake Road Generating Station St. Joseph, MO 9 Settling Pond Interim Settling Basin (Southwest Settling Basin)None Low Satisfactory“ The CCB Ash Pond functions as one ash pond separated into four pools; therefore, Kleinfelder only considered the outer embankment of the CCB Ash Pond, disregarding the interior dike between the northeast and northwest pools and the filter dikes between the northern pools and southeast and southwest pools.”

Kansas City Power & Light Co Lake Road Generating Station St. Joseph, MO 9 Settling Pond Final Settling Basin (Southeast Settling Basin) None Low Satisfactory“ The CCB Ash Pond functions as one ash pond separated into four pools; therefore, Kleinfelder only considered the outer embankment of the CCB Ash Pond, disregarding the interior dike between the northeast and northwest pools and the filter dikes between the northern pools and southeast and southwest pools.”

Kansas City Power & Light Co Lake Road Generating Station St. Joseph, MO 9 Slag Settling Pond Slag Settling Pool (Northeast Ash Pool) None Low Satisfactory“ The CCB Ash Pond functions as one ash pond separated into four pools; therefore, Kleinfelder only considered the outer embankment of the CCB Ash Pond, disregarding the interior dike between the northeast and northwest pools and the filter dikes between the northern pools and southeast and southwest pools.”

Kansas City Power & Light Co Lake Road Generating Station St. Joseph, MO 9 Coal Pile Run-off Pool (Northwest Ash Pool) None Low Satisfactory“ The CCB Ash Pond functions as one ash pond separated into four pools; therefore, Kleinfelder only considered the outer embankment of the CCB Ash Pond, disregarding the interior dike between the northeast and northwest pools and the filter dikes between the northern pools and southeast and southwest pools.” NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 Bottom Ash Cooling Pond Not assessed None NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 Dewatered Sludge Disposal Area Dewatered Sludge Disposal Area None low Satisfactory NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 FGD Emergency Pond E Not assessed None NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 Not in database ST-18 low Satisfactory NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 ST-10 Pump Not assessed None NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 ST-9 Pump Not assessed None NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 Stormwater Pond A Not assessed None



### Page 14 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes NRG Texas Power, LLC Limestone Electric Generating Station Jewett, TX 9 Stormwater Pond B Not assessed None NV Energy Reid Gardner Generating Station Moapa, NV 9 B1 B1 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 B2 B2 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 B3 B3 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 C1 C1 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 C2 C2 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 E1 E1 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 E2 E2 None Significant Significant Fair NV Energy Reid Gardner Generating Station Moapa, NV 9 F F None Significant Significant Fair Progress Energy Carolinas Inc L. V. Sutton Power Station Wilmington, NC 9 1971 Pond 1971 Pond Low significant Satisfactory inactive Progress Energy Carolinas IncW. H. Weatherspoon Power Station Lumberton, NC 9 1979 Pond Ash Pond Low Intermediate Hazard (NC) low Fair Progress Energy Carolinas Inc Lee Power Station Goldsboro, NC 9 1980 Pond Active Ash Pond, Wayne-022 Low high (NC) Significant fair Progress Energy Carolinas Inc L. V. Sutton Power Station Wilmington, NC 9 1984 Pond 1984 Pond Low significant Satisfactory active Progress Energy Carolinas Inc Lee Power Station Goldsboro, NC 9 Not in database Inactive Ash Pond 1, Wayne-031 low SatisfactoryTaken out of service in 1973 and have not been used since Progress Energy Carolinas Inc Lee Power Station Goldsboro, NC 9 Not in database Inactive Ash Pond 2, Wayne-032 low fair Taken out of service in 1973 and have not been used since Progress Energy Carolinas Inc Lee Power Station Goldsboro, NC 9 Not in database Inactive Ash Pond 3, Wayne-033 low SatisfactoryTaken out of service in 1973 and have not been used since Progress Energy Carolinas Inc H. B. Robinson Power Station Hartsville, SC 9 Pond Ash Pond Low Low (company) low Satisfactory Santee Cooper (South Carolina Pub Serv Auth) Cross Power Station Pinesville, SC 9 Bottom Ash 1 Bottom Ash Pond 1 None Low (company) Low satisfactory Santee Cooper (South Carolina Pub Serv Auth) Cross Power Station Pinesville, SC 9 Bottom Ash 2 Bottom Ash Pond 2 None Low (company) Low satisfactory Santee Cooper (South Carolina Pub Serv Auth) Cross Power Station Pinesville, SC 9 Gypsum Pond Gypsum Pond None Less than Low (company) Less than Low satisfactory

South Carolina Electric&Gas Co Canadys Steam Power Station Canadys, SC 9 Active Ash Pond Active Ash Pond None None Low Poor factors of safety for seismic loading conditions that do not meet required standards.

South Carolina Electric&Gas Co Urquhart Generating Station Beech Island, SC 9 Ash Pond 1 Ash Pond; Ash Pond Upper Pool None low satisfactoryAlthough each unit was rated satisfactory, a potential for liquefaction to occur and not apparently seen as an issue. Recommendations section does not address this issue.

South Carolina Electric&Gas Co Urquhart Generating Station Beech Island, SC 9 Ash Pond 2 Ash Pond; Ash Pond Lower Pool None low satisfactoryAlthough each unit was rated satisfactory, a potential for liquefaction to occur and not apparently seen as an issue. Recommendations section does not address this issue.

South Carolina Electric&Gas Co Canadys Steam Power Station Canadys, SC 9 Inactive Ash Pond Inactive Ash Pond None None Low Poor factors of safety for seismic loading conditions that do not meet required standards. Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 Longterm Flyash Pond Not assessed Low Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 North Bottom Ash North Bottom Ash Low Low Fair Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 North Economizer Ash Pond North Economizer Ash Pond Low Low Fair Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 North Recycle Pond Not assessed Low Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 Settling Pond Not assessed Low Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 South Bottom Ash Pond South Bottom Ash Pond Low Low Fair Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 South Economizer Ash Pond South Economizer Ash Pond Low Low Fair inactive Tampa Electric Co Big Bend Power Station Apollo Beach, FL 9 South Recycle Pond Not assessed Low

Alliant Energy Interstate Power & Light Co - Sixth Street Generating Station Cedar Rapids, IA 10 Ash Pond 1 None None low Fair



### Page 15 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes

Alliant Energy Interstate Power & Light Co - Sixth Street Generating Station Cedar Rapids, IA 10 Ash Pond 2 None None low Fair

Alliant Energy Interstate Power & Light Co - Sixth Street Generating Station Cedar Rapids, IA 10 Ash Pond 3 None None low Fair

Alliant Energy Interstate Power & Light Co - Sixth Street Generating Station Cedar Rapids, IA 10 Ash Pond 4 None None low Fair

Alliant Energy Interstate Power & Light Co - Sutherland Generating Station Marshalltown, IA 10 Main Ash Settling Pond Main Pond None low Fair

Alliant Energy Interstate Power & Light Co - Sutherland Generating Station Marshalltown, IA 10 Unit 1 & 2 Initial Settling Pond North Primary Settling Pond None Not Assessed

Alliant Energy Interstate Power & Light Co - Sutherland Generating Station Marshalltown, IA 10 Unit 3 Inititial Settling Pond South Primary Settling Pond None Not Assessed

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 A Ponds (Two) South A Pond None low Satisfactory

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 A Ponds (Two) North A Pond None low Satisfactory

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 B Pond None low Satisfactory

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 C Pond None Not Assessed

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 F Pond None low Satisfactory

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 I43 Coal Combustion landfill Contact Pond None Not Assessed

Alliant Energy WI Power & Light Co - Edgewater Generating Station Sheboygan, WI 10 Slag Pond None low Satisfactory

Alliant Energy WI Power & Light Co -Nelson Dewey Generating Station Cassville, WI 10 Slag Pond None Low Satisfactory

Alliant Energy WI Power & Light Co -Nelson Dewey Generating Station Cassville, WI 10 WPDES Pond None Low Satisfactory Alliant Energy WI Power & Light Co -Rock River Generating Beloit, WI 10 Final WPDES Pond None Low Poor Alliant Energy WI Power & Light Co -Rock River Generating Beloit, WI 10 Slag Pond None Less than Low poor Alliant Energy WI Power & Light Co -Rock River Generating Beloit, WI 10 WPDES Pond 1 None Low poor Alliant Energy WI Power & Light Co -Rock River Generating Beloit, WI 10 WPDES Pond 2 None Low poor Ameren Energy Generating Co Hutsonville Power Station Hustonville, IL 10 Ash Pond A Ash Pond A/Fly Ash Disposal Pond Low Class III (state) Low poor Ameren Energy Generating Co Hutsonville Power Station Hustonville, IL 10 Ash Pond B Ash Pond B/Interim Ash Pond None None Low poor Ameren Energy Generating Co Hutsonville Power Station Hustonville, IL 10 Ash Pond C Ash Pond C None not assessed Ameren Energy Generating Co Hutsonville Power Station Hustonville, IL 10 Bottom Ash Pond Pond D None None Low poor

American Electric Power Columbus Southern Power Co - Picway Power Station Lockbourne, OH 10 Ash Pond Low class II (state) significant satisfactory Basin Electric Power Coop Laramie River Power Station Wheatland, WY 10 Bottom Ash Pond Bottom Ash Pond 1 Low Low Low Poor Basin Electric Power Coop Laramie River Power Station Wheatland, WY 10 Bottom Ash Pond Bottom Ash Pond 2 Low Low Low Poor Basin Electric Power Coop Laramie River Power Station Wheatland, WY 10 Bottom Ash Pond Bottom Ash Pond 3 Low Low Significant Poor Basin Electric Power Coop Laramie River Power Station Wheatland, WY 10 Emergency Holding Pond East Emergency Holding Pond Low Low Significant Poor Basin Electric Power Coop Laramie River Power Station Wheatland, WY 10 Emergency Holding Pond West Emergency Holding Pond Low Low Significant Poor



### Page 16 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Dayton Power & Light Co Killen Station Manchester, OH 10 Bottom Ash Pond Low class I high poor Dayton Power & Light Co Killen Station Manchester, OH 10 Fly Ash Pond Low class I high poor Dynegy Midwest Generation Inc Baldwin Energy Complex Baldwin, IL 10 Ash Pond System Primary Fly Ash Pond (PFAP) None significant poor Dynegy Midwest Generation Inc Baldwin Energy Complex Baldwin, IL 10 Ash Pond System Secondary Fly Ash Pond (SFAP) None significant poor Dynegy Midwest Generation Inc Baldwin Energy Complex Baldwin, IL 10 Ash Pond System Secondary Pond None low poor Dynegy Midwest Generation Inc Baldwin Energy Complex Baldwin, IL 10 Ash Pond System Intermediate Pond/Ash Pond Dike None low poor Dynegy Midwest Generation Inc Baldwin Energy Complex Baldwin, IL 10 Ash Pond System Final Pond/Settling Pond Dike None significant poor Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells)Active East Ash Pond SystemPrimary Cell Low Class III (state) significant Poor

Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells)Active East Ash Pond SystemSecondary Cell Low Class III (state) significant Poor Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells)Active East Ash Pond System-Pond 2 East (2E) Low None significant Poor Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells) East Ash Pond System-Pond 2 Low None significant Poor out of service since 1995 Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells) East Ash Pond System-Pond 4 Low None significant Poor out of service since 1995 Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells) West Ash Pond System-Pond 1 Low None significant Poor out of service since 1997 Dynegy Midwest Generation Inc Hennepin Power Station Hennepin, IL 10 Ash Pond System (2 cells) West Ash Pond System-Pond 3 Low None significant Poor out of service since 1997 Edison International Homer City Generating Station Homer City, PA 10 Ash Disposal Site - Polishing Pond None Not Assessed

Edison International Homer City Generating Station Homer City, PA 10 Ash Disposal Site - Stormwater Surge Pond None Not Assessed Edison International Homer City Generating Station Homer City, PA 10 Ash Disposal Site - Treatment Pond #1 None Not Assessed Edison International Homer City Generating Station Homer City, PA 10 Ash Disposal Site - Treatment Pond #2 None Not Assessed Edison International Homer City Generating Station Homer City, PA 10 Ash Recycle Pond #1 None None less than low poor Edison International Homer City Generating Station Homer City, PA 10 Ash Recycle Pond #2 None None less than low poor Edison International Homer City Generating Station Homer City, PA 10 Ash Recycle Pond #3 None None less than low poor Edison International Homer City Generating Station Homer City, PA 10 Ash Recycle Pond #4 None None less than low poor

Edison International Homer City Generating Station Homer City, PA 10 Coal Refuse Disposal Site - Leachate Pump Pond None Not Assessed

Edison International Homer City Generating Station Homer City, PA 10 Coal Refuse Disposal Site - Small Sediment Trap None Not Assessed Edison International Homer City Generating Station Homer City, PA 10 Coal Refuse Disposal Site - Stage I & II Pond None Not Assessed

Edison International Homer City Generating Station Homer City, PA 10 Coal Refuse Disposal Site - Stage III & IV Pond Low Not Assessed Edison International Homer City Generating Station Homer City, PA 10 Coal Refuse Disposal Site - Storage Pond #1 None Not Assessed Edison International Homer City Generating Station Homer City, PA 10 Coal Refuse Disposal Site - Storage Pond #2 None Not Assessed First Light Power Resources Mt. Tom Station Holyoke, MA 10 Bottom Ash Basin Bottom Ash Basin A/Basin A None low poor First Light Power Resources Mt. Tom Station Holyoke, MA 10 Equalization Tank None Not Assessed First Light Power Resources Mt. Tom Station Holyoke, MA 10 Special Basin Special Basin/Sedimentation Basin None low poor Great River Energy Coal Creek Station Underwood, ND 10 Ash Pond 91 Low None Low satisfactory Great River Energy Coal Creek Station Underwood, ND 10 Upstream Raise/Ash Pond 92/Drains Pond Low None Low satisfactory Great River Energy Stanton Plant Stanton, ND 10 Middle Bottom Ash Pond/Retention Cell Center Drainage Pond Less than Low Less than Low satisfactory Great River Energy Stanton Plant Stanton, ND 10 North Bottom Ash Pond/Cell North Ash Pond Less than Low Less than Low satisfactory



### Page 17 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Great River Energy Stanton Plant Stanton, ND 10 South Bottom Ash Pond/Cell 2 South Ash Pond Less than Low Less than Low satisfactory

Lansing Board of Water & Light Erickson Power Station Lansing, MI 10 Unit 1 Ash Pond None low (state) low UNRATED At the time of our inspection, the Ash Pond was dewatered and in the process of undergoing modifications which included excavation and removal of previously placed ash followed by disposal at an off-site Type JI sanitary landfill. Therefore, in accordance with EPA's direction, GZA has not assigned a condition rating for this impoundment structure at this time. Northern Indiana Pub Serv Co Bailly Generating Station Chesterton, IN 10 Bottom Ash Pond Bottom Ash Storage Area None none UNRATED unit is incised. Northern Indiana Pub Serv Co Bailly Generating Station Chesterton, IN 10 Forebay None none UNRATED unit is incised. Northern Indiana Pub Serv Co Bailly Generating Station Chesterton, IN 10 Primary 1 Primary Settling Pond No. 1 None none UNRATED unit is incised. Northern Indiana Pub Serv Co Bailly Generating Station Chesterton, IN 10 Primary 2 Primary Settling Pond No. 2 None none UNRATED unit is incised. Northern Indiana Pub Serv Co Bailly Generating Station Chesterton, IN 10 Secondary 1 Secondary Settling Pond No. 1 None none UNRATED unit is incised. Northern Indiana Pub Serv Co Bailly Generating Station Chesterton, IN 10 Secondary 2 Secondary Settling Pond No. 2 None none UNRATED unit is incised.
Northern Indiana Pub Serv CoD.H. Mitchell Generating Station Gary, IN 10 Primary 1 Primary Settling Basin No. 1 None less than low UNRATED breached following plant shutdown in 2002 and no longer contain liquids
Northern Indiana Pub Serv CoD.H. Mitchell Generating Station Gary, IN 10 Primary 2 Primary Settling Basin No. 2 None less than low UNRATED breached following plant shutdown in 2002 and no longer contain liquids
Northern Indiana Pub Serv CoD.H. Mitchell Generating Station Gary, IN 10 Primary 3 Primary Settling Basin No. 3 None less than low UNRATED breached following plant shutdown in 2002 and no longer contain liquids
Northern Indiana Pub Serv CoD.H. Mitchell Generating Station Gary, IN 10 Primary 4 Primary Settling Basin No. 4 None UNRATED incised
Northern Indiana Pub Serv CoD.H. Mitchell Generating Station Gary, IN 10 Secondary 1 Secondary Settling Basin No. 1 None less than low UNRATED breached following plant shutdown in 2002 and no longer contain liquids
Northern Indiana Pub Serv CoD.H. Mitchell Generating Station Gary, IN 10 Secondary 2 Secondary Settling Basin No. 2 None less than low UNRATED breached following plant shutdown in 2002 and no longer contain liquids
Northern Indiana Pub Serv CoMichigan City Generating Station Michigan City, IN 10 Bottom Ash Pond None None not assessed
Northern Indiana Pub Serv CoMichigan City Generating Station Michigan City, IN 10 Final Settling Basin Final Settling Pond (FSP) None None low satisfactory
Northern Indiana Pub Serv CoMichigan City Generating Station Michigan City, IN 10 Primary 1 Primary Settling Pond No. 1 None None significant satisfactory
Northern Indiana Pub Serv CoMichigan City Generating Station Michigan City, IN 10 Primary 2 Primary Settling Pond No. 2 None None significant satisfactory
Northern Indiana Pub Serv CoMichigan City Generating Station Michigan City, IN 10 Secondary 1 Secondary Settling Pond No. 1 None None low satisfactory
Northern Indiana Pub Serv CoMichigan City Generating Station Michigan City, IN 10 Secondary 2 Secondary Settling Pond No. 2 None None low satisfactory NRG Huntley Power, LLC Huntley Electric Generating Station Tonawanda, NY 10 Not in Survey Pond 1 None none UNRATED incised NRG Huntley Power, LLC Huntley Electric Generating Station Tonawanda, NY 10 Not in Survey Pond 2 None significant fair NRG Huntley Power, LLC Huntley Electric Generating Station Tonawanda, NY 10 Not in Survey Pond 3 None significant fair NRG Huntley Power, LLC Huntley Electric Generating Station Tonawanda, NY 10 North Equalization Basin None None none UNRATED are not coal combustion waste impoundments NRG Huntley Power, LLC Huntley Electric Generating Station Tonawanda, NY 10 South Equalization Basin None None none UNRATED are not coal combustion waste impoundments NRG Huntley Power, LLC Huntley Electric Generating Station Tonawanda, NY 10 South Settling Pond System None None significant fair Otter Tail Power Company Coyote Station Beulah, ND 10 Ash Pond None none UNRATED incised Otter Tail Power Company Coyote Station Beulah, ND 10 Nelsen Pond None low poor Otter Tail Power Company Coyote Station Beulah, ND 10 Sluice Pond None none UNRATED incised PPL Generation, LLC PPL Brunner Island Power Station York Haven, PA 10 Ash Basin No.6 Less than Low category 3 (state) significant fair PPL Generation, LLC PPL Brunner Island Power Station York Haven, PA 10 Equalization Pond None not assessed PPL Generation, LLC PPL Brunner Island Power Station York Haven, PA 10 Industrial Waste Treatment Basin Incidental Waste Treatment Basin None not assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Coal Handling Ponds None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Fly Ash Disposal Pond Low Not Assessed



### Page 18 of 19Company Facility Location Round Survey Unit Name (Link to existing DB) Assessment Unit Name Hazard Rating from Survey Database State or Company Equivalent Hazard Potential ClassificationContractor-determined Hazard Potential Classification (if different)* EPA Condition

Assessment Comments/Notes Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond 1 None low (state) low poor Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond 2 None low (state) low poor Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond 3 None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond 3A None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond 4 None low (state) low poor Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond A-1 None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond S-1 None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond S-2 None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond S-3 None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 Pond S-6 None Not Assessed Southern Illinois Power Coop Marion Plant Marion, IL 10 South Fly Ash Pond Low Not Assessed UGI Development Company Hunlock Power Station Hunlock Creek, PA 10 East Basin (003) None low poor UGI Development Company Hunlock Power Station Hunlock Creek, PA 10 West Basin (005) None low poor Xcel Energy NSP-W Bay Front Plant Ashland, WI 10 Polishing Pond Polishing Basin None None less than low satisfactory Xcel Energy NSP-W Bay Front Plant Ashland, WI 10 Surge Basin None None less than low satisfactory

589 589 589 589 586 Help on count functions: http://www.contextures.com/xlautofilter02.html
Condition Ratings* # of Facilities # of Units Rated Satisfactory Fair Poor Unsatisfactory Sums Round 1 22 43 22 15 6 0 43 Round 2 16 40 31 9 0 0 40 Round 3 15 37 15 12 10 0 37 Round 4 20 70 23 17 30 0 70 Round 5 17 38 15 14 9 0 38 Round 6 21 44 3 27 14 0 44 Round 7 24 56 34 10 12 0 56 Round 8 14 46 9 16 21 0 46 Round 9 23 51 29 18 4 0 51 Round 10 25 67 20 9 38 0 67 Totals: 197 492 201 147 144 0 492



### Page 19 of 19