NC0000396_EMC SOC WQS17-010_20191024

ts DUKE James Wells
Vice President
ENERGY.
Environmental, Health and Safety
Programs&Environmental Sciences
526 South Church Street
Charlotte, NC 28202
[phone]
October 24, 2019
Via Overnight Mail
Landon Davidson
Asheville Regional Office Regional Supervisor
North Carolina Department of Environmental Quality
Division of Water Resources
Water Resources - Water Quality Regional Operations
2090 U.S. 70 Highway RECEIVED
Swannanoa, NC 28778-8211
NOV 0 4 2019
Bob Sledge
North Carolina Department of Environmental Quality NCDEQIDWRINPDES
Water Quality Permitting Program
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Report Under Special Order by Consent — EMC SOC WQ S 17-010
Duke Energy Progress, LLC — Asheville Steam Electric Plant
NPDES Permit NC0000396
Quarterly Progress Report for 3rd Quarter 2019
Dear Messrs. Davidson and Sledge:
On behalf of Duke Energy Progress, LLC (DEP), I am submitting to you the Asheville Steam
Electric Plant Progress Report summarizing the work and activities undertaken with respect to
closure of coal ash surface impoundments as required by the Asheville Steam Electric Plant
NPDES Permit NC0000396 Special Order by Consent (SOC), SOC No. S 17-010 Section 2.c.2).
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.

Messrs. Davidson and Sledge
October 24, 2019
Page 2
Please direct any questions concerning the Asheville Steam Electric Plant NPDES Permit
NC0000396 SOC No. S 17-010 to Robert Wylie at [phone].
Sincerely,
James ells
Vice Pr 'dent, Environment, Health & Safety-
Programs and Environmental Sciences
Duke Energy
CC: Richard Baker, Duke Energy
Robert Wylie, Duke Energy
Tina Woodward, Duke Energy
Teresa Williams, Duke Energy
George Hamrick, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy
Randy Hart, Duke Energy
Henry Duperier, Duke Energy

NPDES PERMIT NC0000396
SPECIAL ORDER BY CONSENT EMC SOC S17-010
QUARTERLY EXCAVATION PROGRESS REPORT
ASHEVILLE STEAM ELECTRIC GENERATING PLANT
OCTOBER 24, 2019

Background and Summary
On October 10, 2018, Duke Energy Progress, LLC (DEP) and the North Carolina Environmental
Management Commission entered into a Special Order by Consent— EMC SOC S17-010 (SOC) applicable
to the Asheville Steam Electric Generating Plant (Asheville). This report is submitted in accordance with
Section 2.c.2)of the SOC. In compliance with Section 2.c.2),this report summarizes the work and activities
undertaken with respect to decanting work and closure of coal ash surface impoundments at Asheville.
The quarterly reports are due no later than the last day of January,April,July,and October for the duration
of the SOC.
The Asheville Steam Electric Generating Plant is located in Arden, NC, approximately eight miles south of
Asheville, NC. Unit 1 was constructed in 1964. Unit 2 was added in 1971. The site originally contained
two ash basins. The 1982 Ash Basin was excavated,verified clean, and turned over for construction of the
natural gas combined-cycle plant in September 2016.
Excavation of the 1964 Basin is ongoing. During the period July 1, 2019 —September 30 2019, Asheville
excavated approximately 227,285 tons of ash from the site and transported it by truck to the R&B Landfill
in Homer, Georgia. As of September 30, 2019, approximately 6,839,346 tons of ash have been excavated
from the Asheville site, in total.
The Mountain Energy Act of 2015 amended the Coal Ash Management Act of 2014 closure date for the
Asheville site from August 1, 2019 to August 1, 2022. The current plan is for Asheville to complete
excavation by February 28, 2022 and perform ash removal verification procedures in advance of the
August 1, 2022 compliance date. At present, Asheville is not at risk for excavation within the required
timeframe.
The 1964 Ash Basin is currently void of free-standing water,except for the Duck Pond and the lined Center
Pond (part of the rim ditch wastewater treatment system). The Duck Pond is a three-acre unlined
retention pond, and stormwater and process water flows into the Duck Pond have been captured and
pumped to the head of the rim ditch wastewater treatment system within the footprint of the 1964 Basin.
The treated wastewater then flows to the permitted NPDES Outfall 001. In July 2018,the site commenced
interstitial dewatering of the 1964 Ash Basin. Duke Energy received a new NPDES wastewater permit for
the Asheville site, which became effective on December 1, 2018. This permit was subsequently modified
on May 24, 2019, with a new effective date of July 1, 2019.
The stormwater and process water flows to the Duck Pond were diverted in September 2019 to a lined
retention basin constructed within the 1964 Ash Basin to manage water flows after the coal plant is
retired. The flows to the lined retention basin are currently pumped to the head of the rim ditch. This
flow path is planned until either the 4th Qtr. 2019 or 1st Qtr. 2020, when the planned water treatment
system is constructed and commissioned.
Asheville: 1

Ash Transported Off Site in Thousands of Tons I October 1, 2018 to September 30, 2019
Asheville Ash Transportation
90
so -
L
ji,, _
0
■ .,went Plan
40 ■Acnral
30
20 I
19 t-
In-1S Gel'.19 -r 1r ACr 1- May 19 lun 19 1ul 19 Aug Is S- 1.
Ash Transported Off Site in Millions of Tons I January 2015 to February 2022
AshevilleAshTransportation T ansportation
c ar1
.YS \5 by by tiro 4 ti0 tib tit \) •`� \� •ti0 tib\0 `0 •s°r '\r \� ti ,y0 '10 ^O ,LO ,L\ 1\ �; ti`
\ 0ti\ Os Os Os Cis 0\\ 0\\ 0\\ 01\ 0\\ 0\\ Os Os 0\\ Os 0\\ 0\\ Os 0\\ Os Os 0\\ O\\ Oti\ Os Oti\ 0\\ 0\\ 0\\ Oti\
O\\ oa\ o\\ \o\ OA\ oe\ o\\ tio\ Oti\ Op\ OA\ 4\ CO 0t o�\ \o\ O\\ Qe\ o�\ \o\ o 0b\ 0A\ \o\ a �\ o \a\ o o,\ a�\
Regulatory Date.8/1/22 Current P1.ra -Actual
•Current Plan as a`1/i/19 assumes 8 3r,M tons oath a forecast completion date of 2/28/22
•Current Plan and Actuals are same prior to 1/1/19 dare to yearly Plan adjustment
Asheville: 2