NC0004961_Report Under Special Order by Consent_20171027

DUKE
ENERGY,
Jame" Well
Vire President
Environmental I-leaith & Safaty-
Coal Combustion Product,
526 South Church Stieet
Mail Code EC -121-1
Charlotte, NC 28202
[phone]
October 25, 2017
Via Email
Corey Basinger
Mooresville Regional Supervisor
North Carolina Department of Environmental Quality
Division of Water Resources
Regional Water Quality Operations Section
601 East Center Avenue, Suite 301
Mooresville, NC 28115
Bob Sledge
North Carolina Department of Environmental Quality
Water Quality Permitting Program
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject Report Under Special Order by Consent - SOC No S16-005
Duke Energy Carolinas, LLC - Riverbend Steam Station
NPDES Permit NC0004961
Dear Mr. Basinger and Mr Sledge -
RECEIVED/NC,E-Q11A R
OCT 2 7 2017
vvat , Quality
Permitting Section
On behalf of Duke Energy Carolinas, LLC ("DEC'), I am submitting to you the Riverbend Steam
Station Progress Report summarizing the work and activities undertaken with respect to closure
of coal ash surface impoundments as required by the Riverbend Steam Station NPDES Permit
NC0004961 Special Order by Consent ("SOC'), SOC No S16-005 Section 2. d
As required by the SOC, I certify under penalty of law that this document and all attachments
were prepared under my direction or supervision in accordance with a system designed to
assure that qualified personnel properly gather and evaluate the information submitted Based
on my inquiry of the person or persons who manage the system, or those persons directly
responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fine and imprisonment for
knowing violations

Mr Corey Basinger and Mr Bob Sledge
October 25, 2017
Page 2
Please direct any questions concerning the Riverbend Steam Station NPDES Permit
NC0004961 SOC No. S16-005 to Brad Loveland at [phone].
Sincerely,
Jame Wells
Vice Aresident, Environment, Health & Safety -
Coal Combustion Products
Duke Energy
CC. Richard Baker, Duke Energy
Brad Loveland, Duke Energy
Rick Massey, Duke Energy

NPDES PERMIT NC0004961
SPECIAL ORDER BY CONSENT EMC SOC Wo 516-005
QUARTERLY EXCAVATION PROGRESS REPORT
RIVERBEND STEAM STATION
OCTOBER 25, 2017

I. Background and Summary
On November 10, 2016, Duke Energy Carolinas, LLC ("DEC") and the North Carolina
Environmental Management Commission entered into Special Order by Consent — EMC SOC
WQ S16-005 ("SOC") applicable to the Riverbend Steam Station ("Riverbend") This report is
submitted in accordance with paragraph 2.d of the SOC In compliance with Section 2 d this
report summarizes the work and activities undertaken with respect to closure of coal ash surface
impoundments at Riverbend, including a status update for necessary permits. The quarterly
reports are due no later than the last day of January, April, July, and October for the duration of
the SOC.
A. Riverbend Steam Station Closure Summary
Riverbend is located off of Horseshoe Bend Beach Road near the town of Mt Holly in
Gaston County, North Carolina, on the south bank of the Catawba River. The site contains two
ash basins, as well as the Dry Ash Stack and the Cinder Pit As of April 2013, all of the coal-
fired electric generation units were retired.
The North Carolina Coal Ash Management Act of 2014 ("CAMA") requires that ash
from the Riverbend Plant's ash basins be excavated and relocated to a lined facility with the ash
basins closed by August 1, 2019. The initial excavation plan was submitted to NCDEQ on
November 13, 2014, detailing the first 12 — 18 months of projected ash basin excavation
activities An updated plan that highlighted the completed milestones and provided the status of
necessary permits was submitted to NCDEQ on December 21, 2016
The Riverbend facility continues to excavate ash and transport by rail to the Brickhaven
Structural Fill site During the period from July 1, 2017 and September 30, 2017 the Riverbend
site has transported 3,377,998 tons of ash from the Riverbend basins and ash stack and has
transported a cumulative total of 3,377,998 tons of ash from the site Since completing bulk
dewatermg in February, 2017, basins have been maintained in a dewatered state with interstitial
and contact stormwater being treated through the on-site water treatment facility
At present, Riverbend is not considered at risk to miss the excavation deadline imposed
by CAMA Duke Energy's current production plan projects completion of ash excavation before
March 3, 2019 The charts below track the tonnage of ash transported from May 2017 to
October 31, 2017, and from January 2016 to completion The increase in the monthly excavation
rate beginning in July is a result of additional trains being allocated to the Riverbend project once
those trains were no longer transporting ash from the Sutton project.

Ash Transported Off Site in Thousands of Tons I July 2017 to September 2017
Riverbend Ash Transportation
350
300 -
250;
r 200
4q d'
Poll;�'`A1
Ln
Q 150'
_ r- d 4
100 AMA.
50 IA
Jan Feb Mar Apr I May Jun Jul I Aug Sep
2017
Ash Transported Off Site in Millions of Tons
Riverbend - Ash Transportation Tonnage
Plan
6
5 -
4
� � I
o
i
3
i
c ,
2 - -
i
Q
05/01/15 05/01/16 05/01/17 05/01/18
4
i
-i Planned
Actual
-Plan
- --Actual

Status of Permits and Permit Applications
MEDIA
PERMIT 11A-
- �� -
DA
COMMENTS
NPDES Industrial
May 15, 2015 (R)
SPPP implementation date was
Stormwater Permit
November 15, 2015
Water
NPDESWastewater
First quarter 2016 (R)
(modified by SOC in
Permit became effective
Permit — Mayor
fourth quarter 2016)
December 1, 2016
Modification
Jurisdictional Wetland and
There are no identified
Stream Impacts/ 404
N/A
jurisdictionalwetland/stream
Permitting and 401 WQC
impacts
Intermediate Dam
Submitted May 31, 2016 and
Decommissioning
June 16, 2016 (R)
received approval on June 16,
Request Approval
2016
Transportation and excavation
activities must not impact a
jurisdictional dam or dike
Dam Safety
Excavation activities are initially
Primary and Secondary
staying 50 feet away from the
Dam Decommissioning
January 1, 2018 (T)
jurisdictional dike. Removing ash
Request Approval
from the Primary and Secondary
Ash Basins will have to be
reviewed with Dam Safety
Breaching of dike will require
Dam Safety approval
Mine Reclamation
Received Permit to
Owner/Operator obtained an
Waste
Individual Structural Fill
Operate
individual structural fill permit as
Permit
October 15, 2015
set forth in Part II, § 130A-
309 219 of CAMA
Site-specific
Nuisance/Noise/Od or/
Other Requirements
Other Requirements,
N/A
None identified
including DOT and FERC
Requirements