NC0004961_Special Order By Consent_20190123

•
(Avis DUKE
ENERGY® James Wells
Vice President
Environmental,Health&Safety-
Programs and Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte, NC 28202
[phone]
January 23, 2019
Via Overnight Mail RECEIVED/DENR/DWR
Corey Basinger BAN 25 2019
Mooresville Regional Supervisor
North Carolina Department of Environmental Quality Water Resources
Division of Water Resources Permmtting Section
Regional Water Quality Operations Section
601 East Center Avenue, Suite 301
Mooresville, NC 28115
Bob Sledge
g
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
January 23, 2019
Page 2
Please direct any questions concerning the Riverbend Steam Station NPDES Permit
NC0004961 SOC No. S16-005 to Brad Loveland at [phone].
Sincerely
ames Wells
Vice PNesident, 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 WO S16-005
QUARTERLY EXCAVATION PROGRESS REPORT
RIVERBEND STEAM STATION
JANUARY 23, 2019

I. Background and Summary
On November 10, 2016, Duke Energy Carolinas, LLC (DEC) and the North Carolina
Environmental Management Commission entered into the Special Order by Consent—EMC SOC
WO 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 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 continued to make progress with excavation efforts. Excavation
of the Primary and Secondary Ash Basins, Ash Stack and Cinder Pit is ongoing. During the period
October 1, 2018 to December 31, 2018, Riverbend excavated approximately 347,891 tons of ash
from the site and transported it by rail to the Brickhaven Structural Fill site near Moncure, North
Carolina. As of December 31, 2018, approximately 5,155,779 tons of ash have been excavated
from the Riverbend site.
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. The
current plan is for Riverbend to complete excavation by the end of February 2019 and perform
ash removal verification procedures in advance of the August 1, 2019 compliance date.
Since completing bulk dewatering in February 2017, the basins have been maintained in
a dewatered state with interstitial and contact stormwater being treated through the on-site water
treatment facility. Post closure activities, including decommissioning of the Primary and
Secondary Dams, will begin following the completion of ash excavation activities.
i

Ash Transported in Thousands of Tons I July 2018 to December 2018
Riverbend Ash Transportation
140
:: fl
. ■Current Plan
■Actual
40
Jul 18 Aug 1S Sep 18 Oct 18 Nov IS Dec 18
•Current Plan as of 6/1118 assumes 4 86ht tons with a forecast completon of 11/21/18
•Current Forecast assumes 5 2M torn wrtn a forecast completion of 1/31/19
Ash Transported in Millions of Tons I May 2015 to January 2019
Riverbend Ash Transportation 3l1/19
6C
40
g
20
10
0.0 -- -
4s4' �\', 4' 1r nu �\O ti\•(O � �\%^ ".\<‘ s\."‘ 4." e .0 1\• e y`tia e
Pegulatory Date —Forecast —Car rent Pine -nctual.
S/1/19
•Current Plan as of 6/1/18 assumes 4 86M tons with a forecast completion of 11/21/18
•Current Forecast assumes 5 2M tons with a forecast completion of 1/31/19
2

Status of Permits and Permit Applications
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
Permit — Major (Modified by SOC
Water Modification in Q4 2016) December 1, 2016.
Jurisdictional Wetland There are no identified
and Stream Impacts N/A jurisdictional
4 Permitting wetland/stream impacts.
and
401 WQC
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 May 29, 2018.
Secondary Dam June 7, 2018 (R) Received approval June 7,
Decommissioning 2018.
Request Approval
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
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