Coal Combustion Residuals Impoundment 

Assessment Reports 

As part of the U.S. Environmental Protection Agency’s ongoing national effort to assess the 

management of coal combustion residuals (CCR), EPA is releasing the final contractor reports 

assessing the structural integrity of impoundments and similar management units containing coal 

combustion residuals, commonly referred to as “coal ash,” at facilities. Most of the impoundments 

have a “high” or “significant” hazard potential rating. The hazard potential rating is not related to the 

stability of those impoundments but to the potential for harm should the impoundment fail. For 

example, a “significant” hazard potential rating means impoundment failure can cause economic loss, 

environmental damage, or damage to infrastructure.

EPA has assessed all of the known units with a dam hazard potential rating of “high” or “significant” as 

reported in the responses provided by electric utilities to EPA's information requests and additional 

units identified during the field assessments. (EPA has not yet assessed TVA units – these will be done 

on a separate schedule.) EPA will release additional reports as they become available. Posted below 

are the final reports.

The reports being released now have been completed by contractors who are experts in the area of 

dam integrity, reflect the best professional judgment of the engineering firm, and are signed and 

stamped by a professional engineer. The reports are based on a visual assessment of the site, 

interviews with site personnel, and the review of geotechnical reports and studies related to the 

design, construction and operation of those impoundments, if available. The engineering firms also 

reviewed past state/federal inspections of the impoundments. EPA contractors were not authorized to 

conduct any physical drilling, coring or sampling while on site; however, they did review studies which 

may have included such information. These reports include complex engineering evaluations and use 

terms which may be unfamiliar to the general public. Also, the contractors were asked to rate the 

impoundments as “satisfactory,” “fair,” “poor,” or “unsatisfactory,” terms commonly used in the field 

of dam safety. Expert experience has shown that only impoundments rated as “unsatisfactory” pose 

immediate safety threats. None of the impoundments assessed so far have received an 

“unsatisfactory” rating. Impoundment ratings noted in the reports should be taken in the proper 

context, since a unit may be found to be structurally sound while it may receive a fair or poor rating 

based on other factors such as lack of information.

Draft copies of these reports have been reviewed by the facilities and the states for factual accuracy 

and their comments on the draft reports have also been posted. EPA continues to review the reports 

and the technical recommendations, and is working with the facilities to ensure that the 

recommendations are implemented.
EPA has provided a copy of the final report to each facility and has requested that the facility 

implement the recommendations in the reports and provide plans for taking action. These plans are 

being posted below as they become available. Should facilities fail to take sufficient measures, EPA will 

take additional action, if the circumstances warrant, and will be devoting special attention to those 

facilities receiving a “poor” rating.

Ratings summary for the assessments:

First

Round 

Second

Round 

Third

Round

Satisfactory 22 31 15

Fair 15 9 12

Poor 6 0 10

Unsatisfactory 0 0 0

Total number of units 43 40 37

The companies in the table below have at some point claimed some information they have provided to 

the EPA related to their coal ash impoundments is confidential business information (CBI). While EPA 

reviews these claims, the information that is claimed as CBI is redacted (removed) from the coal ash 

reports. If these claims are accepted by the EPA, the information will remain redacted. If EPA denies 

these claims, the information will be made publicly available and posted to this website.

The public should be aware that Southern Company subsidiaries (Georgia Power and Alabama Power) 

have informed the Agency that major portions of their draft and final EPA assessment reports contain 

CBI information; as a result, the Agency will review and make a determination on these CBI claims 

after requesting further substantiation. The Agency will release redacted (edited) versions of these 

reports. Southern Company is taking a legally allowable position, however, it should be noted that no 

other utility company has taken a similar position with regard to the release of EPA's draft and final 

site assessment reports.

CBI Claims

Company that Claims CBI EPA’ Determination 

on CBI Claim

Alabama Power Company

- Gorgas Power Station

In Process 

Duke Energy Corporation Denied

First Energy Generation Corporation -

Little Blue Run Dam

Denied

Georgia Power Company

- Bowen Power Station

- Plant Branch or Harlee Branch Power Station

In Process 

In Process 

If you have any questions regarding EPA's information collection effort or field assessments of coal 

combustion residual impoundments, or if you identify any errors/discrepancies please contact Jim 

Kohler (kohler.james@epa.gov, 703-347-8953), Jana Englander (englander.jana@epa.gov, 703-308-

8711), or Craig Dufficy (dufficy.craig@epa.gov, 703-308-9037). 

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more. 
NOTE: Documents open faster if your browser is open. If you have problems accessing documents 

from the following links, you can either right-click on the link, copy the link location, and paste it into 

your browser; or you can access the documents from EPA's website at 

http://www.epa.gov/waste/nonhaz/industrial/special/fossil/surveys2/index.htm

Reports 

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A

Alabama Power Company - William Crawford Gorgas Electric Generating Plant 

Cover Letter (PDF) (3 pp, 874K)

Comments (PDF) (10 pp, 130K)

Draft Report (PDF) (67 pp, 4MB)

Final Report (PDF) (69 pp, 5MB)

Company Response/Action Plan (PDF) (2 pp, 46K)

Allegheny Energy - Pleasants Power Station 

Cover Letter (PDF) (4 pp, 25K)

Comments (PDF) (16 pp, 3MB)

Draft Report (PDF) (83 pp, 6MB)

Final Report (PDF) (83 pp, 6MB)

Allegheny Energy - R Paul Smith Station 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (25 pp, 2MB)

Draft Report (PDF) (91 pp, 13MB)

Final Report (PDF) (91 pp, 7MB)

American Electric Power - Big Sandy Power Plant 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (10 pp, 67K)

Draft Report (PDF) (125 pp, 11MB)

Final Report (PDF) (125 pp, 10MB)

American Electric Power - Cardinal Power Plant 

Cover Letter (PDF) (4 pp, 25K)

Comments (PDF) (6 pp, 54K)

Draft Report (PDF) (149 pp, 56MB)

Final Report (PDF) (149 pp, 55MB)

Company Response/Action Plan (PDF) (6 pp, 52K)

American Electric Power - Conesville Generating Station 

Cover Letter (PDF) (5 pp, 26K)

Comments (PDF) (11 pp, 255K)

Draft Report (PDF) (85 pp, 6MB)

Final Report (PDF) (86 pp, 6MB)

American Electric Power - General James Gavin Power Plant 

Cover Letter (PDF) (4 pp, 1.5MB)

Comments (PDF) (19 pp, 195K)

Draft Report (PDF) (109 pp, 18MB)

Final Report (PDF) (111 pp, 19MB)

Company Response/Action Plan (PDF) (8 pp, 266K)

American Electric Power - John E Amos Power Plant 

Cover Letter (PDF) (4 pp, 31K)

Comments (PDF) (2 pp, 22K)

Draft Report Bottom Ash (PDF) (43 pp, 3MB)

Final Report Bottom Ash (PDF) (37 pp, 22MB)

Draft Report Fly Ash (PDF) (35 pp, 2MB)

Final Report Fly Ash (PDF) (45 pp, 3MB)
Company Response/Action Plan (PDF) (978 pp, 65MB)

American Electric Power - Mitchell Power Plant 

Cover Letter (PDF) (3 pp, 20K)

Comments (PDF) (2 pp, 22K)

Draft Report (PDF) (160 pp, 35MB)

Final Report (PDF) (159 pp, 27MB)

Company Response/Action Plan (PDF) (2 pp, 31K)

American Electric Power - Mountaineer Power Plant 

Cover Letter (PDF) (3 pp, 21K)

Comments (PDF) (2 pp, 19K)

Draft Report (PDF) (39 pp, 7MB)

Final Report (PDF) (39 pp, 4MB)

Company Response/Action Plan (PDF) (3 pp, 36K)

American Electric Power - Muskingum Power Plant 

Cover Letter (PDF) (6 pp, 30K)

Comments (PDF) (18 pp, 485K)

Draft Report (PDF) (182 pp, 10MB)

Final Report (PDF) (181 pp, 12MB)

American Electric Power - Philip Sporn Generating Plant 

Additional Information Regarding AEP's Philip Sporn Power Plant in New Haven, West 

Virginia

Cover Letter (PDF) (1 pp, 16K)

Comments (PDF) (7 pp, 91K)

Draft Report (PDF) (88 pp, 8M)

Final Report (PDF) (97 pp, 7M)

AEP Response to Recommendations (PDF) (173 pp, 10M)

AEP Supplemental Information (PDF) (10 pp, 760K)

Evaluation of AEP Response (PDF) (6 pp, 75K)

Information Request Letter (PDF) (10 pp, 456K)

Information Request Letter Modification (PDF) (1 pp, 39K)

American Electric Power - Tanner Creek Facility 

Cover Letter (PDF) (3 pp, 914K)

Comments - Bottom Ash and Fly Ash (PDF) (3 pp, 28K)

Draft Report Bottom Ash (PDF) (40 pp, 27MB)

Final Report Bottom Ash (PDF) (40 pp, 6MB)

Draft Report Fly Ash (PDF) (54 pp, 31MB)

Final Report Fly Ash (PDF) (44 pp, 7MB)

Company Response/Action Plan (PDF) (2 pp, 290K)

Arizona Electric Power Coop Inc. - Apache Power Station 

Comments (PDF) (22 pp, 4.5MB)

Draft Report (PDF) (157 pp, 24MB)

Final Report (PDF) (159 pp, 24MB)' 

Supplemental Information (PDF) (14 pp, 4MB)

Company Response/Action Plan (PDF) (6 pp, 852K)

Arizona Public Service Co. - Cholla Power Station 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (7 pp, 468K)

Draft Report (PDF) (167 pp, 29MB)

Final Report (PDF) (150pp, 28MB)

Company Response/Action Plan (PDF) (5 pp, 3.5MB)

Arizona Public Service Co. - Four Corners Power Station 

Cover Letter (PDF) (3 pp, 948K)

Comments (PDF) (13 pp, 754K)

Draft Report (PDF) (43 pp, 434K)

Final Report (PDF) (125 pp, 13MB)

Company Response/Action Plan (PDF) (4 pp, 119K)
B 

Big Rivers - Coleman Generating Station 

Cover Letter (PDF) (4 pp, 24K)

Comments (PDF) (9 pp, 264K)

Draft Report (PDF) (77 pp, 6MB)

Final Report (PDF) (77 pp, 6MB)

Big Rivers - Reid/Green/HMPL 

Cover Letter (PDF) (4 pp, 24K)

Comments (PDF) (7 pp, 110K)

Draft Report (PDF) (55 pp, 5MB)

Final Report (PDF) (55 pp, 5MB)

Company Response/Action Plan (PDF) (4 pp, 119K)

C - no entries

D

Dayton Power and Light - JM Stuart

Cover Letter (PDF) (2 pp, 17K)

Comments (PDF) (24 pp, 354K)

Draft Report (PDF) (139 pp, 10MB)

Final Report (PDF) (168 pp, 8MB)

Duke Energy Carolinas - Allen Steam Station 

Cover Letter (PDF) (3 pp, 856K)

Comments (PDF) (5 pp, 93K)

Draft Report (PDF) (68 pp, 16MB)

Final Report (PDF) (71 pp, 22MB)

Company Response/Action Plan (PDF) (35 pp, 157K)

Duke Energy Carolinas - Belews Creek Steam Station 

Cover Letter (PDF) (4pp, 24K)

Comments (PDF) (6 pp, 283K)

Draft Report (PDF) (70 pp, 6MB)

Final Report (PDF) (70 pp, 7MB)

Company Response/Action Plan (PDF) (5 pp, 1.4MB)

Duke Energy Carolinas - Buck Steam Station 

Cover Letter (PDF) (7pp, 2MB)

Comments (PDF) (12 pp, 171K)

Draft Report (PDF) ( 156 pp, 36MB) 

Final Report (PDF) (158 pp, 36MB)

Company Response/Action Plan (PDF) (7 pp, 82K)

Duke Energy Carolinas - Dan River Steam Station 

Cover Letter (PDF) (4 pp, 1MB)

Comments (PDF) (4 pp, 27K)

Draft Report (PDF) (111 pp, 20MB)

Final Report (PDF) (133pp, 22MB)

Company Response/Action Plan (PDF) (4 pp, 663K)

Duke Energy Carolinas - Marshall Steam Station 

Cover Letter (PDF) (4 pp, 976K)

Comments (PDF) (6 pp, 160K)

Draft Report (PDF) (67 pp, 27MB)

Final Report (PDF) (68 pp, 29MB)

Company Response/Action Plan (PDF) (4 pp, 170K)

Duke Energy Carolinas - Riverbend Power Station 

Cover Letter (PDF) (4 pp, 1MB)
Comments (PDF) (13 pp, 63)

Draft Report (PDF) (91 pp, 10MB)

Final Report Annotation Memo (1 pp, 7K)

Final Report (PDF) (92 pp, 5MB)

Company Response/Action Plan (PDF) (5 pp, 125K)

Duke Energy Corporation - Miami Fort Generating Station 

Cover Letter (PDF) (4 pp, 24K)

Comments (PDF) (8 pp, 288K)

Draft Report (PDF) (91 pp, 6MB)

Final Report (PDF) (91 pp, 6MB)

Duke Energy Corporation - W.C. Beckjord Generating Station 

Cover Letter (PDF) (4 pp, 24K)

Comments (PDF) (14 pp, 400K)

Draft Report (PDF) (170 pp, 9MB)

Final Report (PDF) (200 pp, 12MB)

Dynegy Midwest Generation, Inc.- Havana Power Station 

Cover Letter (PDF) (2 pp, 436K)

Comments (PDF) (15 pp, 2MB)

Draft Report (PDF) (26 pp, 2MB)

Final Report (PDF) (32 pp, 4MB)

Final Report Appendices (PDF) (414 pp, 38MB)

Company Response/Action Plan (PDF) (2 pp, 27K)

Dynegy Midwest Generation, Inc.- Wood River Power Station 

Cover Letter (PDF) (2 pp, 433K)

Comments (PDF) (27 pp, 804K)

Draft Report (PDF) (25 pp, 464K)

Final Report (PDF) (31 pp, 617K)

Final Report Appendices (PDF) (666 pp, 66MB)

Company Response/Action Plan (PDF) (1 pp, 7K)

E 

E.ON - Kentucky Utilities - E.W. Brown Plant 

Cover Letter (PDF) (4 pp, 20K)

Comments (PDF) (23 pp, 328K)

Ash Draft Report (PDF) (37 pp, 2MB)

Ash Final Report (PDF)(386 pp, 94MB)

Auxillary Draft Report (PDF) (32 pp, 3MB)

Auxillary Final Report (PDF)(360 pp, 344MB)

E.ON - Kentucky Utilities - Ghent Generating Station 

Cover Letter (PDF) (4 pp, 24K)

Comments (PDF) (9 pp, 261K)

Draft Report (PDF) (141 pp, 19MB)

Final Report (PDF)(141 pp, 19MB)

E.ON - Louisville Gas & Electric Co. - Mill Creek Station 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (6 pp, 104K)

Draft Report (PDF) (44 pp, 4MB)

Final Report (PDF)(44 pp, 4MB)

Company Response/Action Plan (PDF) (2 pp, 600K)

E.ON - Louisville Gas & Electric Co. - Cane Run Station 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (229 pp, 29MB)

Draft Report (PDF) (82 pp, 5MB)

Final Report (PDF)(84 pp, 5MB)
F 

First Energy Generation Corporation - Bruce Mansfield Power Plant 

Cover Letter (PDF) (3 pp, 20K)

Comments (PDF) (1 pp, 14K)

Draft Report (PDF) (78 pp, 8MB)

Final Report (PDF) (79 pp, 5MB)

Supplemental Checklists (PDF) (28 pp, 265K)

Supplemental Inspections (PDF) (101 pp, 16MB)

Company Response/Action Plan (PDF) (3 pp, 31K)

First Energy Generation Corporation - Bruce Mansfield Power Plant - Little Blue Run Dam 

Cover Letter - Little Blue Run Dam (PDF) (4 pp, 25K)

Comments - Little Blue Run Dam (PDF) (194 pp, 27K)

Draft Report - Little Blue Run Dam (PDF) (90 pp, 17MB)

Final Report - Little Blue Run Dam (PDF) (93 pp, 7MB)

G

Georgia Power - Plant Bowen 

Cover Letter (PDF) (3 pp, 834K)

Comments (PDF) (21 pp, 688K)

Draft Report (PDF) (93 pp, 21MB)

Final Report (PDF) (59 pp, 3MB)

Company Response/Action Plan (PDF) (3 pp, 139K)

Georgia Power - Plant Branch 

Cover Letter (PDF) (5 pp, 27K)

Redacted Final Report (PDF) (188 pp, 3MB)

H - no entries

I

Indiana-Kentucky Electric Corp. - Clifty Creek Power Station 

Cover Letter (PDF) (5 pp, 2MB)

Comments Bottom Ash Pond (PDF) (9 pp, 138K)

Comments Fly Ash Pond (PDF) (10 pp, 138K)

Draft Report Bottom Ash Pond (PDF) (60 pp, 8MB)

Final Report Bottom Ash Pond (PDF) (62 pp, 9MB)

Draft Report Fly Ash Pond (PDF) (65 pp, 8MB)

Final Report Fly Ash Pond (PDF) (66 pp, 9MB)

Company Response/Action Plan (PDF) (5 pp, 80K)

J - no entries

K - no entries

L

Louisville Gas and Electric Power - Trimble County Generating Station 

Cover Letter (PDF) (4 pp, 1MB)

Comments (PDF) (19 pp, 100K)

Draft Report (PDF) (63 pp, 40MB)
Final Report (PDF) (63 pp, 9MB)

Company Response/Action Plan (PDF) (2 pp, 521K)

M - no entries

N 

Northern States - Sherburne County Power Station 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (10 pp, 839K)

Draft Report (PDF) (151 pp, 16MB)

Final Report (PDF) (149 pp, 9MB)

Company Response/Action Plan (PDF) (7 pp, 2MB)

O - no entries

Ohio Valley Electric - Kyger Creek Power Station 

Cover Letter (PDF) (3 pp, 21K)

Comments (PDF) (8 pp, 248K)

Draft Report (PDF) (93 pp, 12MB)

Final Report (PDF) (93 pp, 19MB)

P

PacifiCorp Energy - Jim Bridger Power Station 

Cover Letter (PDF) (4 pp, 1MB)

Comments (PDF) (9 pp, 418K)

Draft Report (PDF) (42 pp, 400K)

Final Report (PDF) (121 pp, 18MB)

Company Response/Action Plan (PDF) (5 pp, 68K)

PacifiCorp Energy - Naughton Power Station 

Cover Letter (PDF) (4 pp, 23K)

Comments (PDF) (9 pp, 116K)

Draft Report (PDF) (152 pp, 31MB)

Final Report (PDF) (152 pp, 31MB)

Company Response/Action Plan (PDF) (3 pp, 1MB)

PPL Generation, LLC - Martins Creek Electric Station 

Cover Letter (PDF) (5 pp, 25K)

Comments (PDF) (4 pp, 25K)

Draft Report (PDF) (109 pp, 14MB)

Final Report (PDF) (109 pp, 28MB)

Supplemental Information (PDF) (941 pp, 70MB)

Company Response/Action Plan (PDF) (3 pp, 17K)

PPL Montana, LLC - Colstrip Steam Electric Station 

Cover Letter (PDF) (5 pp, 2MB)

Comments (PDF) (21 pp, 4MB)

Draft Report (PDF) (57 pp, 502K)

Final Report (PDF) (171 pp, 14MB)

Company Response/Action Plan (PDF) (35 pp, 157K)

Progress Energy - Asheville Power Station 

Cover Letter (PDF) (4 pp, 1MB)

Comments (PDF) (1 pg, 11K)

Draft Report (PDF) (30 pp, 380K)

Draft Report Appendices (142 pp, 47MB)
Final Report (PDF) (36 pp, 565K)

Final Report Appendices (142 pp, 47MB)

Company Response/Action Plan (PDF) (4 pp, 104K)

Progress Energy - Cape Fear Power Station 

Cover Letter (PDF) (5 pp, 2MB)

Comments (PDF) (16 pp, 1MB)

Draft Report (PDF) (150 pp, 32MB)

Final Report (PDF) (152 pp, 33MB)

Company Response/Action Plan (PDF) (8 pp, 390K)

Progress Energy - Mayo Power Station 

Cover Letter (PDF) (3 pp, 736K)

Comments (PDF) (2 pp, 911K)

Draft Report (PDF) (23 pp, 138K)

Draft Report Appendices (PDF) (121 pp, 18MB)

Final Report (PDF) (29 pp, 312K)

Final Report Appendices (PDF) (127 pp, 18MB)

Company Response/Action Plan (PDF) (3 pp, 74K)

Progress Energy - Roxboro Power Station 

Cover Letter (PDF) (3 pp, 21K)

Comments (PDF) (17 pp, 2MB)

Draft Report (PDF) (89 pp, 8MB)

Final Report (PDF) (88 pp, 7MB)

Supplemental Information (PDF) (29 pp, 316K)

Company Response/Action Plan (PDF) (2 pp, 119K)

Q - no entries 

R - no entries 

S 

Salt River Project - Coronado Power Station 

Cover Letter (PDF) (4 pp, 25K)

Comments (PDF) (5 pp, 166K)

Draft Report (PDF) (100 pp, 46MB)

Final Report (PDF) (109 pp, 47MB)

Company Response/Action Plan (PDF) (6 pp, 804K)

T

Tri-State Generation and Transmission Association Inc. - Escalante Power Station 

Cover Letter (PDF) (2 pp, 494K)

Comments (PDF) (52 pp, 14MB)

Draft Report (PDF) (52 pp, 14MB)

Final Report (PDF) (53 pp, 14MB)

Company Response/Action Plan (PDF) (1 pp, 7K)

U - no entries

V
Vectren - AB Brown Power Station 

Cover Letter (PDF) (4 pp, 1.3MB)

Comments - Upper and Lower Ash (PDF) (5pp, 606K)

Draft Report Lower Ash (PDF) (37 pp, 7.8MB)

Final Report Lower Ash (PDF) (38 pp, 13MB)

Draft Report Upper Ash (PDF) (35 pp, 16MB)

Final Report Upper Ash (PDF) (36 pp, 16MB)

Company Response/Action Plan (PDF) (3 pp, 541K)

W

Westar Energy - Jeffrey Energy Center 

Cover Letter (PDF) (5 pp, 1MB)

Comments (PDF) (49 pp, 992K)

State Comments (PDF) (2pp, 82K)

Draft Report (PDF) (47 pp, 452K)

Final Report (PDF) (116 pp, 10MB)

Company Response/Action Plan (PDF) (2 pp, 489K)

X - no entries

Y - no entries

Z - no entries