NC0000396_SOC_20200129

DUKE James Wells
ENERGY_,, Vice President
Environmental, Health and Safety
Programs & Environmental Sciences
526 South Church Street
Charlotte, NC 28202
[phone]
January 29, 2020
Via Overnight Mail
Landon Davidson
Asheville Regional Office Regional Supervisor
North Carolina Department of Environmental Quality RECEIVED
Division of Water Resources
Water Resources - Water Quality Regional Operations FEB 0 4 1010
2090 U.S. 70 Highway
Swannanoa, NC 28778-8211 WDEO/DNR/WDES
Bob Sledge
North Carolina Department of Environmental Quality
Water Quality Permitting Program
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1611
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 4th 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
January 29, 2020
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,
6Jamesells
Vice President, 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
JANUARY 29, 2020

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 517-010 (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 Octoberfor 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 October 1, 2019 — December 31, 2019,
Asheville excavated approximately 115,303 tons of ash from the site and transported it by truck to the
R&B Landfill in Homer, Georgia. As of December 30, 2019, approximately 6,954,649 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 newly -constructed, lined
retention basin (LRB) and the lined Center Pond (part of the rim ditch wastewater treatment system).
The LRB is a lined retention pond, too which stormwater and process water, which were previously
managed through the Duck Pond, have been diverted. Flows into the LRB are captured and pumped to
the newly constructed water treatment system. The treated wastewater then flows to the permitted
NPDES Outfall 001. On July 12, 2018, the site commenced interstitial dewatering of the 1964 Ash Basin
and will continue, until approximately Q3 2022. 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 area of the 1964 basin commonly referred to as 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.
Treatment of interstitial wastewater is performed by the rim ditch and center pond treatment system.
This treatment process will continue, until coal plant/rim ditch retirement. Following coal plant
retirement, waste water will be treated using a new WWT. The Waste Water Treatment System (WTS)
was commissioned and ready for service, as of November 19, 2019. The WTS will be required following
the shutdown of the coal plant and the rim ditch being removed from service.
Asheville: 2

Ash Transported Off Site in Thousands of Tons I July 1, 2019 to December 31, 2019
Asheville Ash Transportation
90
80
70
A
t'o 60
F
L
Q
o sc
0
40,
1
30
10
1
lU
lul 19 Aug 19 Sep 19 Oct 1�
Ash Transported Off Site in Millions of Tons I January 2015 to February 2022
Asheville Ash Transportation
90
8.0 '
7.0
6.0 !
5.0
i0
3.0 i
2.0
1.0
''. 00 i ... _...
8,1122
by tih '�`� tih Nb N" .1b .1b NA .11 NA NA ,�� N% l0 .lb .1a1 ti� ti� ti� 1� 10 .ti0 .y0 .1'1 .L% .yti ,LN titi ,ti-1, titi
"\ o'\ o'� o'� o%\ o'� oN\ oN\ oN\ o'� o!,� 01� o'� o�� o�\ o� o, o,' oso",\ o`\ o�\ o'� o'� 01� o`\ o'� o'\ Iti IPP 01� ,Spy 0� �P� OAS ,1p� I ti 'i IA .11 I; OPT 11�y0� I1
Regulatory Date: 811122 -Current Plan -Actual
• Current Plan as of 1/1/19 assumes 8. 36M tons with a forecast completion date of 2128122
• Current Plan and Actuals are same prior to 1/1/19 due to yearly Plan adjustment
Asheville: 3