DukeEnergy_DanRiver_CCR_RemovalVerification_Clarification_20190919

(> RDUKE ENEGY
September 19, 2019
North Carolina Department of Environmental Quality
Attn: Mr. Jim Gregson and Mr. Ed Mussler
217 W. Jones Street
Raleigh, NC 27603
3195 Pine Hall Road
Belews Creek, NC 27009
Subject: Clarification for the Confirmation of Excavation Requirements
Dan River Ash Basins
Dear Mr. Mussler:
On September 11, 2019, Duke Energy received Confirmation of Excavation Requirements for
the Dan River Combined Cycle Station Ash Basins from the North Carolina Department of
Environmental Quality (DEQ). DEQ concurred that the visual confirmation data provided met
the overall objectives of sample collection and analysis but it requested additional information
concerning grid locations at which samples were not collected. The locations in question were
not sampled because the nodes fell either on top of the dam or on the exterior face of the dam.
Since these areas were not in contact with ash, they were not sampled. The attached table
contains the rationale for each of the grid locations in question.
If there are any questions or need any clarification regarding the information provided, please
contact me at [e-mail] or [phone].
Respectfully submitted, }
Melonie Martin
Lead Environmental Specialist — EHS Groundwater & Waste Programs
Attachment: Dan River Ash Basin Sample Rationale Table

Dan River Ash Basin Sample Rationale Table
Sample Grid Location
Rationale for No Sample Collection
BC-1E
Grid location on the exterior face of the dam
BC-2E
Grid location on the exterior face of the dam
BC-6H
Grid location on the exterior face of the dam
BC-71
Grid location on the exterior face of the dam
BC-81
Grid location on the exterior face of the dam
BC-10J
Grid location on the exterior face of the dam
BC-12J
Grid location located on the top of the dam
BC-13J
Grid location located on the top of the dam
BC15K
Grid location on the exterior face of the dam
BC-24K
Grid location located on the top of the dam
BC-25L
Grid location located on the top of the dam
BC-27M
Grid location located on the top of the dam
BC-29K
Grid location located on the top of the dam
BC-29L
Grid location located on the top of the dam
BC-29M
Grid location located on the top of the dam