NC0024406_Annual Report_20190515

DUKE
ENERGY
May 15, 2019
Sergei Chernikov, PhD
State of North Carolina
Department of Environmental Quality
Division of Water Resources
Complex NPDES Permitting Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Belews Creek Steam Station
Duke Energy Carolinas
3194 Pine Hall Road
Walnut Creek, NC 27609
RECEIVED/NCDEQ/DWR
Subject: Duke Energy Carolinas, LLC
Belews Creek Steam Station - #NC0024406
Bromide Reduction Evaluation Semi —Annual Report
Dear Dr. Chernikov:
MAY 21 2019
Water Quality
Permitting Section
As required by Condition A. (20) of the subject NPDES permit attached are three copies of the
Semi-annual status report summarizing Duke Energy's efforts to reduce bromide discharge and
potential subsequent Total Trihalomethane (TTHM) formation in downstream municipal water
treatment systems.
Should you have questions regarding this report, please contact Joyce Dishmon at 336-623-0238
or [e-mail].
Yours tr ,
Reginald D. Anderson
General Manager III, Regulated Stations
Belews Creek Steam Station
Power Generating Carolinas East
Attachment

Belews Creek Steam Station
Bromide Reduction Evaluation NPDES Permit-NC0024406
Semi -Annual Progress Report
May 2019
Pursuant to Condition A.(20) Bromide Reduction Evaluation of the NPDES Permit — NC0024406.
Duke Energy submits this semi-annual progress report. This report is required to summarize on-
going investigations focused on minimizing bromide discharge at Outfall 003 as well as efforts
aimed at reducing the formation of total trihalomethanes (TTHM) at downstream water
treatment plants.
• Duke Energy has worked cooperatively with the North Carolina Division of Water
Resources (DWR), the Town of Madison and City of Eden to address the bromide/TTHM
issues since being advised of the municipality's issues with TTHM formation.
• Bromide itself is not a health concern in surface waters. There is no water quality
standard for bromide and no NPDES permit limit.
• Duke Energy has provided direct technical expertise and financial assistance to Madison
and Eden to help address their respective TTHM issues.
Town of Madison
• No updated information new to report since the last submittal.
City of Eden
• No updated information new to report since last submittal.
Belews Creek Steam Station
• Duke Energy has partnered with UNC-C and Electric Power Research Institute (EPRI) to
perform a lysimeter pilot at Mayo Power Plant that is reviewing halide sequestration and
encapsulation strategy from a longterm perspective.
• Belews Creek is currently planning for 50% natural gas co -fire capabilities by 41h quarter
of 2019 and 2020 for Units 1 and 2, respectively. This modification to the operation of
the station is a result of other factors but is expected to have an added benefit of
decreasing the mass of bromide discharges.
• In May 2018, Belews Creek completed construction of Submerged Flight Conveyor system
and initiated dry handling of bottom ash.

Belews Creek Steam Station
Bromide Reduction Evaluation NPDES Perm it-NC0024406
Semi -Annual Progress Report
May 2019
Pursuant to Condition A.(20) Bromide Reduction Evaluation of the NPDES Permit — NC0024406.
Duke Energy submits this semi-annual progress report. This report is required to summarize on-
going investigations focused on minimizing bromide discharge at Outfall 003 as well as efforts
aimed at reducing the formation of total trihalomethanes (TTHM) at downstream water
treatment plants.
• Duke Energy has worked cooperatively with the North Carolina Division of Water
Resources (DWR), the Town of Madison and City of Eden to address the bromide/TTHM
issues since being advised of the municipality's issues with TTHM formation.
• Bromide itself is not a health concern in surface waters. There is no water quality
standard for bromide and no NPDES permit limit.
• Duke Energy has provided direct technical expertise and financial assistance to Madison
and Eden to help address their respective TTHM issues.
Town of Madison
• No updated information new to report since the last submittal.
City of Eden
• No updated information new to report since last submittal.
Belews Creek Steam Station
• Duke Energy has partnered with UNC-C and Electric Power Research Institute (EPRI) to
perform a lysimeter pilot at Mayo Power Plant that is reviewing halide sequestration and
encapsulation strategy from a longterm perspective.
• Belews Creek is currently planning for 50% natural gas co -fire capabilities by 0 quarter
of 2019 and 2020 for Units 1 and 2, respectively. This modification to the operation of
the station is a result of other factors but is expected to have an added benefit of
decreasing the mass of bromide discharges.
• In May 2018, Belews Creek completed construction of Submerged Flight Conveyor system
and initiated dry handling of bottom ash.

Belews Creek Steam Station
Bromide Reduction Evaluation NPDES Perm it-NC0024406
Semi -Annual Progress Report
May 2019
Pursuant to Condition A.(20) Bromide Reduction Evaluation of the NPDES Permit — NC0024406.
Duke Energy submits this semi-annual progress report. This report is required to summarize on-
going investigations focused on minimizing bromide discharge at Outfall 003 as well as efforts
aimed at reducing the formation of total trihalomethanes (TTHM) at downstream water
treatment plants.
• Duke Energy has worked cooperatively with the North Carolina Division of Water
Resources (DWR), the Town of Madison and City of Eden to address the bromide/TTHM
issues since being advised of the municipality's issues with TTHM formation.
• Bromide itself is not a health concern in surface waters. There is no water quality
standard for bromide and no NPDES permit limit.
• Duke Energy has provided direct technical expertise and financial assistance to Madison
and Eden to help address their respective TTHM issues.
Town of Madison
• No updated information new to report since the last submittal.
City of Eden
• No updated information new to report since last submittal.
Belews Creek Steam Station
• Duke Energy has partnered with UNC-C and Electric Power Research Institute (EPRI) to
perform a lysimeter pilot at Mayo Power Plant that is reviewing halide sequestration and
encapsulation strategy from a longterm perspective.
• Belews Creek is currently planning for 50% natural gas co -fire capabilities by 4th quarter
of 2019 and 2020 for Units 1 and 2, respectively. This modification to the operation of
the station is a result of other factors but is expected to have an added benefit of
decreasing the mass of bromide discharges.
• In May 2018, Belews Creek completed construction of Submerged Flight Conveyor system
and initiated dry handling of bottom ash.