Additonal Source Area Assessment Comments

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November 30, 2018
Paul Draovitch
Senior Vice President
Environmental, Health & Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, North Carolina 28202
Subject: Additional Source Area Assessment Work Plan Comments — Dan River Combined
Cycle Station
Dear Mr. Draovitch:
On November 16, 2018, the North Carolina Department of Environmental Quality Division of
Water Resources (Division) received the proposed Additional Source Area Assessment Work Plan
for the Dan River Combined Cycle Station. The Division has reviewed and hereby approves the
proposed assessment activities under the condition that the following items are addressed as part
of the plan implementation and the results reported in the facilities updated Corrective Action Plan
(CAP).
• An additional well cluster is needed northwest of the former Combustion Turbine area.
• Relocate well cluster CPA-3 S/DBR to the center of former coal pile area.
• Relocate well cluster CPA-4S/D/13R to a location between the CPA-3 and CPA-4 well
clusters.
• Please provide the results of the surface water sampling for the unnamed tributaries
downgradient of the closed Land Clearing and Inert Debris (LCID) landfill that were
approved in the Division's May 24, 2018 letter (Duke Energy Carolinas — Dan River Steam
Station — Surface Water Evaluation Plan to Assess 15 A NCAC 2B Compliance —
Comments). If the results of the surface water sampling indicate that contamination is
North Carolina Department of Environmental Quality I Division of Water Resources IAFOGW Section
512 North Salisbury Street 11.636 Mail Service Center I Raleigh, North Carolina 27699-:.636
919.707.9129

resulting from the closed LCID landfill, then Duke Energy shall provide an additional work
plan to appropriate State agency to assess this potential source area.
If applicable, the results should also be incorporated into the updated CAP's revised geochemical
and groundwater fate and transport models. If the results of the modeling show current or future
impacts to groundwater and/or surface water from this area, then appropriate remedial strategies
shall be proposed in the CAP.
If you have any questions, please contact Shuying Wang (Winston-Salem Regional Office) at
[phone] or Steve Lanter (Central Office) at [phone].
Sincerely,
J drRisgaard, Chief
Animal Feeding Operations and Groundwater Section
cc: WSRO WQROS Regional Office
WQROS Central File Copy