NC0000396_Special Order By Consent_20190124

DUKEE �/ James Wells
" ENERGY. Vice President
Environmental,Health and Safety
Programs&Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte,NC 28202
[phone]
January 24, 2019
Via Overnight Mail
RECEIVED/DENR/DWR
Zan Price
Asheville Regional Office Assistant Regional Supervisor JAN 25 2019
North Carolina Department of Environmental Quality
Division of Water Resources Water Resources
Permitting Section
Water Resources -Water Quality Regional Operations
2090 U.S. 70 Highway
Swannanoa, NC 28778-8211
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—EMC SOC WQ S 17-010
Duke Energy Progress, LLC—Asheville Steam Electric Plant
NPDES Permit NC0000396
Dear Messrs. Price 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. Price and Sledge
g
January 24, 2019
Page 2
Please direct any questions concerning the Asheville Steam Electric Plant NPDES Permit
NC0000396 SOC No. S 17-010 to Tina Woodward at [phone].
Sincerely,
James ells
Vice P esident,Environment, Health & Safety-
Programs and Environmental Sciences
Duke Energy
CC: Richard Baker, 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

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

I. 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. of the SOC. In compliance with Section 2.c., this report
summarizes the work and activities undertaken with respect to 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.
A. Asheville Steam Electric Generating Plant Closure Summary
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, 2018 — December 31,
2018, Asheville excavated approximately 167,536 tons of ash from the site and transported it
by truck to the R&B Landfill in Homer, Georgia. As of December 31, 2018, approximately
6,215,462 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. The
Duck Pond is a three-acre unlined retention pond. Stormwater and process water flows into
the Duck Pond are captured and pumped to head of the rim ditch wastewater treatment
system within the footprint of the 1964 Basin. The treated wastewater continues to flow 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.
Subsequent to the coal plant and rim ditch retirement, a water equalization basin (LRB) and a
new wastewater treatment system (WTS) will be required to complete dewatering of the 1964
Ash Basin. Design efforts for the LRB have been completed and construction will commence in
Q1/Q2 2019. In parallel with construction of the LRB, a pad will be constructed to support a
physical/chemical WTS. The new LRB and WTS are forecasted to be ready for service in Q4
2019.
2

Ash Transported Off Site in Thousands of Tons I October 1, 2018 to December 31, 2018
Asheville Ash Transportation
80
70 ..........._._.
�
cq
G
—�- -�---- III Current Plan
■Actual
30
20
10
Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18
3

Ash Transported Off Site in Millions of Tons I January 2015 to February 2022
Asheville Ash Transportation 8/1122
90
8.0 --
7.0
6.0
5.0
a
jam
3.0 -__....... . ._._._..,... ._...._._
2.0
1.0
0.0 _
•S, e e°� .&e de°�e �e 1\11 �y\~1 de de°•e(04.4'°.y\ti�°.y\�°� ,\1°j°4.5°,y\ti ,1\1°°,e 41°°,1\'L° ,`\'L 41% ,`iY�'°,y\'L�0411.°41'de
o'\° os\° o�\d'\�°�° o�\ v e 0 o,.\o e e ,�o\ oti\ a o�\ tio\ o�\ �p� o�\ °\ 0�1° gyp\ o�\° tio\ o�\° gyp\° 01\° tio\ °J of o�\'*
Regulatory Date: —forecast Current Plan —.Actual
8/1/22
4