2014 Dan River Ash Release-Summary and UpdateNC Water Resources Congress

October 30, 2014

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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.

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Dan River Steam Station

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Stormwater pipes at Dan River

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Dan River ash pond after the pipe leak

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Permanent pipe plug – view from river

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Water Quality Stations

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Water Quality Stations

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Danville Water Plant – Arsenic Trends continued

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South Boston Water Plant – Arsenic Trends continued

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Maximum Daily Aluminum Trends continued

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Maximum Daily Arsenic Trends continued

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Maximum Daily Copper Trends continued

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Maximum Daily Iron Trends continued

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Maximum Daily Turbidity Trends continued

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Duke Energy removes 15 tons of ash from a section of the river near the stormwaterdischarge pipe on Feb. 12

NCDENR, EPA and Duke Energysampled water in the Dan River

NCDENR Photo

A Commitment to the Dan River

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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

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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

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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

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Where we go from here-Sediment Sampling

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Where we go from here-Sediment Sampling

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• 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

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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

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For additional information on Duke Energy’s response, visit duke-energy.com/Dan-River/QUESTIONS?

Contact: Scott T. Fletcher at scott.fletcher@duke-energy.com