1. 2014 Dan River Ash Release-Summary and Update NC Water Resources Congress October 30, 2014

2. 2 What is Coal Ash? Coal ash is the inorganic matter in coal that is left over when the coal is burned to generate electricity. Coal ash is approximately 90 percent common elements such as silicon, iron and calcium, and less than 1 percent trace elements (i.e., arsenic, boron, lead, selenium, zinc). Types of Coal Ash  Fly Ash-a fine material similar to the consistency of talcum powder and accounts for about 70 percent of the coal ash generated annually in the U.S.  Bottom Ash-a coarser material collected in coal-fired burners.  Another coal by-product is gypsum that is produced at coal fired plants with emission-control equipment (scrubbers) to remove sulfur dioxide.

3. 3 Dan River Steam Station

4. 4 Stormwater pipes at Dan River

5. 5 Dan River ash pond after the pipe leak

6. 6 Permanent pipe plug – view from river

7. Water Quality Stations 7

8. 8

9. Danville Water Plant – Arsenic Trends continued 9

10. South Boston Water Plant – Arsenic Trends continued 10

11. Maximum Daily Aluminum Trends continued 11

12. Maximum Daily Arsenic Trends continued 12

13. Maximum Daily Copper Trends continued 13

14. Maximum Daily Iron Trends continued 14

15. Maximum Daily Turbidity Trends continued 15

16. 16 Duke Energy removes 15 tons of ash from a section of the river near the stormwater discharge pipe on Feb. 12 NCDENR, EPA and Duke Energy sampled water in the Dan River NCDENR Photo A Commitment to the Dan River

17. 17 Duke Energy removes ash from Schoolfield Dam in Danville VA A Commitment to the Dan River Dredging began May 6 and ended July 3 with 2,500 tons of sediment removed

18. 18 Duke Energy removes ash from the Town Creek sand bar near Eden NC A Commitment to the Dan River Removal began June 30 and ended July 3 with 258 tons of sediment removed

19. 19 A dedicated team is conducting: Continued long-term monitoring including macroinvertebrates, fish community and tissues, mussels, and sediment deposition and ash content Additional study-adjacent croplands and livestock/crop irrigation Sediment and chemical transport modeling being conducted-Eden to Kerr Reservoir Ongoing discussions with the USFWS, NCDENR and VDEQ on ecological/recreation damage assessment Where we go from here

20. 20 Where we go from here-Sediment Sampling

21. 21 Where we go from here-Sediment Sampling

22. 22 Ongoing discussions with the USFWS, NCDENR and VDEQ (i.e., Trustees) concerning the ecological/recreation natural resource damage assessment (NRDA)  Determine injuries to resources  Surface waters and sediments  Fish and other aquatic resources  Migratory birds  Stream and wetland habitats  Recreational uses (e.g., boating, fishing, hiking)  Conduct damage assessment (i.e., determining and quantifying injuries and calculating damages)  Recover damages through restoration projects Public involvement through restoration project suggestions and plan reviews  Dan River NRDAR Scoping Document comments (comments due November 14, 2014) at http://www.fws.gov/raleigh/  Establishment of a Dan River Stakeholder group Where we go from here-Natural Resource Damage Assessment

23. 23  Enhanced focus on ash basin management, building on our expertise and experience. A dedicated team will: Review of our ash handling and storage facilities across our coal-fired generation fleet Thoroughly analysis of our existing ash management plans by a group of industry experts Re-evaluate our comprehensive strategy and program for ash basin management and closure  We are committed to responding to NCDENR by Nov. 15, as requested, with preliminary excavation plans for the four plants (Asheville, Dan River, Riverbend, Sutton) already categorized as high priority.  We are planning how to meet the Aug. 1, 2019, closure deadline established in the 2014 Coal Ash management Act.  We continue to relocate ash from the Asheville Plant to a lined, engineered structural fill at the Asheville Regional Airport.  The 2014 Coal Ash Management Act directs DENR to submit classifications and priorities of risk levels for ash basins to the Coal Ash Management Commission by the end of 2015. We will provide DENR with whatever information they need to assist in their determinations. Where we go from here-Ash Basin Management

24. 24 For additional information on Duke Energy’s response, visit duke-energy.com/Dan-River/duke-energy.com/Dan-River/ QUESTIONS? Contact: Scott T. Fletcher at scott.fletcher@duke-energy.com