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Home My WebLink AboutNC0024406_Bromide Reduction Evaluation_20191021 Belews Creek Steam Station ,(•' DUKE Duke Energy Carolinas ENERGY® 3194 Pine Hall Road Walnut Creek,NC 27609 Certified Mail#7018 2290 0001 1877 5428 October 21, 2019 RECEIVED Sergei Chernikov, PhD NOV 04 2019 State of North Carolina Department of Environmental Quality NCDEQIDWRINPDES 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 - #NC0024406 Bromide Reduction Evaluation Semi —Annual Report Dear Dr. Chernikov: 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 Joyce.Dishmon@duke-energy.com. Yours, , 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 October 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, 006, and 111 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. 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 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. • Belews Creek is currently rerouting outfalls 003 and 111 to the Dan River via outfall 006. This modification is projected to be completed in November 2019. Outfall 003A was previously re-routed on July 12, 2019. Belews Creek Steam Station Bromide Reduction Evaluation NPDES Permit-NC0024406 Semi-Annual Progress Report October 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, 006, and 111 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. 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 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. • Belews Creek is currently rerouting outfalls 003 and 111 to the Dan River via outfall 006. This modification is projected to be completed in November 2019. Outfall 003A was previously re-routed on July 12, 2019. Belews Creek Steam Station Bromide Reduction Evaluation NPDES Permit-NC0024406 Semi-Annual Progress Report October 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, 006, and 111 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. 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 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. • Belews Creek is currently rerouting outfalls 003 and 111 to the Dan River via outfall 006. This modification is projected to be completed in November 2019. Outfall 003A was previously re-routed on July 12, 2019.