NC0024406_Bromide Reduction Evaluation Semi_20170505

ENERGY,
May 5, 2017
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
Subject: Duke Energy Carolinas, LLC
Belews Creek Steam Station - #NC0024406
Bromide Reduction Evaluation Semi — Annual Report
Dear Dr. Chernikov:
Belews Creek Steam Station
Duke Energy Carolinas
3194 Pine Hall Road
Walnut Creek, NC 27609
RECEIV,ED/,VCD�O/U►N
MAY I 'a. 2017
Water Quality
Pe Water
Section
As required by Condition A. (14) 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 Joy(�[e-mail].
You
RegKald D. Anderson
General Manager III, Regulated Stations
Belews Creek Steam Station
Power Generating Carolinas East
Attachment
cc: Keeley McCormick
Joyce Dishmon

Belews Creek Steam Station
Bromide Reduction Evaluation NPDES Perm it -N C0024406
Semi -Annual Progress Report
May 2017
Pursuant to Condition A.(14) 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 DWR and 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
• City of Eden is continuing work on its chloramines conversion project. The project
startup is scheduled for late May or early June. The delay of startup is based upon
scheduling of required participants.
Belews Creek Steam Station
• Duke Energy is currently conducting a pilot study at the FGD Wastewater Treatment
System (WWTS) to demonstrate halide removal. The wastewater pilot study has an
estimated completion timeframe of three months. The concentrated wastewater is
being stored for a future solids fixation pilot study. Duke Energy notified NC DEQ of the
pilot study in the March 8, 2017 letter titled "Pilot Studies — Notification".

• Duke Energy has partnered with University of North Carolina at Charlotte (UNC -C) Civil
and Engineering Dept. and the engineering firm AMEC Foster Wheeler to complete the
next phase in the halide study. This phase, tentatively scheduled of 4Q 2017, will test
UNC -C's previous lab work on the field demonstration scale. The goal is to produce test
beds of fixated coal combustion byproduct material and FGD wastewater to monitor for
halide sequestration. This phase is regulated under NC DEQ Solid Waste Section.