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Home My WebLink AboutNC0024406_Bromide Reduction Evaluation Semi-Annual Report_20240603DUKE ENERGY, May 28, 2024 Sergei Chernikov, PhD NC Department of Environmental Quality Division of Water Resources Complex NPDES Permitting Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 Subject: Duke Energy Carolinas, LLC Belews Creek Steam Station Permit No. NC0024406 Bromide Reduction Evaluation Semi-annual Report Dear Dr. Chernikov, Belews Creek Steam Station Duke Energy Carolinas 3195 Pine Hall Road Belews Creek, NC 27009 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 Melonie Martin at 336-669-2994 or Melonie.Martin@duke-energy.com. Respectfully, Michael F. Lanning General Manager III, Regulated Stations RRECDG Belews Creek Steam Station Attachment Cc (via email): Lon Snider, NCDEQ WSRO Melonie Martin, Duke Energy Brenda Johnson, Duke Energy Belews Creek Steam Station Bromide Reduction Evaluation NPDES Permit No. NC0024406 Semi -Annual Progress Report May 2024 Pursuant to Condition A. (20) Bromide Reduction Evaluation of the NPDES Permit Number 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, 006, and 111 as well as efforts aimed at reducing the formation of total trihalomethanes (TTHM) at downstream water treatment plants. Outfall 003 and Outfall 111 are no longer in operation. Outfall 003 was replaced by Outfall 006 to the Dan River. Outfall 111 was a toe drain that was rerouted to comingle with other low volume wastewater, ultimately discharging via Outfall 006 to the Dan River. • 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. City of Eden • No updated information new to report. 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 long-term perspective. • Belews Creek's conversion to natural gas for Unit 1 was completed in 4th quarter of 2019. Conversion of Unit 2 was complete in the 4th quarter of 2020. 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. Belews Creek Steam Station Bromide Reduction Evaluation NPDES Permit No. NC0024406 Semi -Annual Progress Report May 2024 Pursuant to Condition A. (20) Bromide Reduction Evaluation of the NPDES Permii Number 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, 006, and 111 as well as efforts aimed at reducing the formation of total trihalomethanes (TTHM) at downstream water treatment plants. Outfall 003 and Outfall 111 are no longer in operation. Outfall 003 was replaced by Outfall 006 to the Dan River. Outfall 111 was a toe drain that was rerouted to comingle with other low volume wastewater, ultimately discharging via Outfall 006 to the Dan River. • 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. City of Eden • No updated information new to report. 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 long-term perspective. • Belews Creek's conversion to natural gas for Unit 1 was completed in 4th quarter of 2019. Conversion of Unit 2 was complete in the 4th quarter of 2020. 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. Belews Creek Steam Station Bromide Reduction Evaluation NPDES Permit No. NC0024406 Semi -Annual Progress Report May 2024 Pursuant to Condition A. (20) Bromide Reduction Evaluation of the NPDES Permit Number 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, 006, and 111 as well as efforts aimed at reducing the formation of total trihalomethanes (TTHM) at downstream water treatment plants. Outfall 003 and Outfall 111 are no longer in operation. Outfall 003 was replaced by Outfall 006 to the Dan River. Outfall 111 was a toe drain that was rerouted to comingle with other low volume wastewater, ultimately discharging via Outfall 006 to the Dan River. • 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. City of Eden • No updated information new to report. 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 long-term perspective. • Belews Creek's conversion to natural gas for Unit 1 was completed in 4th quarter of 2019. Conversion of Unit 2 was complete in the 4th quarter of 2020. 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.