NC0004961_Special Order By Consent_20190411

jDUKE
ENERGY.
James Wells
Vice President
Environmental,Health&Safety-
Programs and Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte,NC 28202
[phone]
April 11, 2019
Via Overnight Mail
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:
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
April 11, 2019
Page 2
Please direct any questions concerning the Riverbend Steam Station NPDES Permit
NC0004961 SOC No. S16-005 to Brad Loveland at [phone].
Jame Wells
Vice resident, Environment, Health & Safety-
Programs and Environmental Sciences
Duke Energy
CC: Richard Baker, Duke Energy
Brad Loveland, Duke Energy
Rick Massey, Duke Energy
George Hamrick, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy
Randy Hart, Duke Energy

NPDES PERMIT NC0004961
SPECIAL ORDER BY CONSENT EMC SOC WQ S16-005
QUARTERLY EXCAVATION PROGRESS REPORT
RIVERBEND STEAM STATION
April 11, 2019

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 decanting work and closure
of coal ash surface impoundments
at Riv
erbend, includingstatus update for necessary a p 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 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 originally contained
two ash basins, as well as the Dry Ash Stack and the Cinder Pit.
The Riverbend site has completed its excavation efforts. Excavation of the Primary and
Secondary Ash Basins, Ash Stack and Cinder Pit was completed on March 16, 2019. During the
period January 1, 2019 to March 16, 2019, Riverbend excavated approximately 195,530 tons of
ash from the site and transported it by rail to the Brickhaven Structural Fill site near Moncure,
North Carolina.
North Carolina state law requires that ash from the basins at the Riverbend site be
excavated and relocated to a lined facility with the ash basins closed by August 1,
2019. Verification has been performed in accordance with the ash removal verification protocol
provided in our latest Ash Excavation Plan.
Dewatering at the site has been completed. Future water management will follow the
site's storm water management plan. A contractor has mobilized to perform post closure
activities, including decommissioning of the Primary and Secondary Dams.
1

Ash Transported in Thousands of Tons I October 2018 to March 2019
Riverbend Ash Transportation
1a-) -
120 -- —
100--- —..---
so
60 — --
■Current Plan
■Actual
40 —
20
Oct 18 Nov 18 Dec 18 lan 19 Feb 19 htar 19
•Current Plan as of 6/1/18 assumes 4.86M tons with a forecast completion of 11/21/18.
•Excavation completed on 3/16/19 with 5.35M tons excavated.
Ash Transported in Millions of Tons I May 2015 to March 2019
Riverbend Ash Transportation
4.0
3.0
f
1.o — -- —
o.o
ti
ti\
S" ,y $' ,b ,b ,� ,b 1 ,1 1� b 4r 0
Oy\ti o).L.\ A 9
\1'+\ , \ ,\,1�\ 0
41' ciP 1'\,��\ o41. �\ry.,\~ 0\,1ti\ti ,v\,�ti\� C01.~ CP\,' dtP%\�
Regulatory late. —Current Plan —Actual
8/1/19
•Current Plan as of 6/1/18 assumes 4-86M tons with a forecast completion of 11/21/18.
•Excavation completed on 3/16/19 with 5.35M tons excavated.
2

Status of Permits and Permit Apolications
MEDIA PERMIT RECEIVED DATE (R) COMMENTS
TARGET DATE (T)
NPDES Industrial NCDEQ issued the ISW
Stormwater (ISW) May 15, 2015 (R) permit May 15, 2015. SPPP
Permit implementation date
was November 15, 2015.
NPDES Wastewater Q1 2016 (R) Permit became effective
Water Permit— Major (Modified by SOC December 1, 2016.
Modification in Q4 2016)
Jurisdictional Wetland
and Stream Impacts There are no identified
404 Permitting N/A jurisdictional
and 401 WQC wetland/stream impacts.
Intermediate Dam Submitted May 31, 2016.
Decommissioning June 16, 2016 (R) Received approval June 16,
Request Approval 2016. Decommissioning
completed March 13, 2017.
Primary Dam Submitted on May 8, 2017.
Dam Safety Modification Request August 3, 2017 (R) Received approval August 3,
Approval 2017. Modification completed
March 3, 2018.
Primary and Resubmitted May29, 2018.
Secondary Dam
Decommissioning June 7, 2018 (R) Received approval June 7,
Request Approval 2018.
Mine Reclamation
Owner/Operator obtained
Waste Individual Structural October 15, 2015 (R) an Individual Structural Fill
Fill Permit (Permit to Operate) Permit pursuant to G.S.
§ 130A-309.219 of the
Coal Ash Act.
Original permit received
Duke Energy Water Conveyance August 2, 2016 (R) April 7, 2016. Amended
Lake Services Permit permit for revised quantities
received August 2, 2016.
Site-Specific
Other Nuisance/Noise/
Requirements Odor/Other N/A None identified.
Requirements,
including DOT
3