NC0004961_Report Under Special Order by Consent No.S16-005_20170726

t DUKE
7 ENERGY
Vice President
Environmental, Health & Safety -
Coal Combustion Products
526 South Church Street
Mad Code EC12H
Charlotte, NC 28202
[phone]
July 26, 2017
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 RECEIVEDINCDEO/ WR
Bob Sledge AUG e 2 2017
North Carolina Department of Environmental Quality Watet Quality
Water Quality Permitting Program
Permitting 5ectt0r,
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.
Please direct any questions concerning the Riverbend Steam Station NPDES Permit
NC0004961 SOC No. S16-005 to Brad Loveland at [phone].
r 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
JULY 26, 2017

1. 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 pert -nits 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. As of July 2, 2017, the
Riverbend site has transported 2,416,323 tons of ash from the station, representing 46.4% of the
total. A total of 866,695 tons of ash have been excavated from the Primary Basin at the
Riverbend site thus far in 2017.
The Sutton Steam Station excavation project finished all rail operations on June, 27 2017,
which is allowing more trains to be allocated to Riverbend. This could have a positive impact oil
excavation rates.
Bulk dewatering of the Secondary Ash Basin was completed in January 2017 and
Interstitial dewatering began in February 2017. All dewatering flows are being treated by the on-
site Wastewater Treatment facility prior to being discharged in accordance with NPDES permit
NC0004961.
Excavation and decommissioning of the Intermediate Dam (GASTO-099) began on
February 9, 2017 and was completed on March 9, 2017. NCDEQ inspected and issued an
approval letter on May 3, 2017.
At present, Riverbend is not considered at risk for excavation completion in the required
timeframe The Riverbend site is on track to comply with the Coal Ash Management Act of 2014

("CAMA") deadline of complete excavation of the ash basins by August 1, 2019, with an
expected completion date of March 3, 2019. The charts below track the tonnage of ash transport
from January 2017 to June 2017 and from May 2015 to completion.
Ash Transported Off Site in Thousands of Tons I January 2017 to June 2017
Riverbend 2017 Ash Transportation
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Ash Transported Off Site in Millions of Tons
Riverbend - Ash Transportation Tonnage Plan
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Plan
—Actual

Status of Permits and Permit Applications
a
r r
r .1 r
) IPOMMEN-rg
TARGET.
NPDES Industrial
May 15, 2015 (R)
PPP implementation date
Stormwater Permit
as November 15, 2015.
Water
NPDES Wastewater
First quarter 2016 (R)
Permit became effective
Permit— Major
(modified by SOC in
December 1, 2016.
Modification
fourth quarter 2016)
Jurisdictional Wetland and
There are no identified
Stream Impacts / 404
N/A
jurisdictional wetland/stream
Permitting and 401 WOC
impacts
Intermediate Dam
Submitted May 31, 2016 and
Decommissioning
June 16, 2016 (R)
received approval on June 16,
Request Approval
2016
Primary Dam was modified in
late 1970's by adding 10 feet,
Primary Dam Modification
July 25, 2017 (T)
partially over ash. This soil
requires removal in order to
excavate the ash below.
Transportation and excavation
Dam Safety
activities must not impact a
urisdictional dam or dike.
Excavation activities are
Primary and Secondary
initially staying 50 feet away
Dam Decommissioning
January 1, 2018 (T)
from the jurisdictional dike.
Removing ash from the
Request Approval
Primary and Secondary Ash
Basins will have to be
reviewed with Dam Safety.
Breaching of dike will require
Dam Safety approval
Mine Reclamation
Waste
Individual Structural Fill
Received Permit toOwner/Operator
obtained an
Permit
Operate
individual structural fill permit
October 15, 2015
as set forth in Part 11, § 130A-
09.219 of CAMA
Site-specific
Other Requirements
Nuisance/Noise/Od or/
Other Requirements,
N/A
None identified.
including DOT and FERC
Requirements