NC0000396_Report_20190424

•
4' DUKE James Wells
ENERGY Vice President
Environmental,Health and Safety
Programs&Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte,NC 28202
[phone]
April 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
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. 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.

A Messrs. Davidson and Sledge
April 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 sident,Environment, Health & Safety-
Progr s 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
Henry Duperier, Duke Energy

NPDES PERMIT NC0000396
SPECIAL ORDER BY CONSENT EMC SOC S17-010
QUARTERLY EXCAVATION PROGRESS REPORT
ASHEVILLE STEAM ELECTRIC GENERATING PLANT
APRIL 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 decanting work and closure of coal ash surface impoundments at Asheville.
The quarterly reports are due no later than the last day ofJanuary,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 January 1, 2019 — March 31, 2019, Asheville
excavated approximately 188,058 tons of ash from the site and transported it by truck to the R&B Landfill
in Homer,Georgia. As of March 31, 2019,approximately 6,403,421 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 manage and treat water on the site and to
complete excavation of the 1964 Ash Basin. Design efforts for the LRB have been completed and
construction will commence in April 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.
Asheville: 1

Ash Transported Off Site in Thousands of Tons I October 1, 2018 to March 31, 2019
Asheville Ash Transportation
80
70 _
sis
g 50
0
c 30 -- ■Current Plan
4
j ■Aitndl
30
20
10
k �
0 +—
Oct 18 No,18 = 1 _:r 19 fep 19 Mar 19
Ash Transported Off Site in Millions of Tons I January 2015 to February 2022
Asheville Ash Transportation 4;12
9.0
8.0
6.0
i 4.0 --- —
;may'-----
3.0 ..
2.0
1.0 — - _ I
0.0
°�\°4°0\°4°\°�\~y\°4°\°�\,�\°4°�\°ti\'y\°4°\°\0�\°40^\°\~y\°ti\'°\°ti\~\°ti\'o\°•,\''\°ti\o1\°.,\''a\°ti\'o1\°ti\',\4°\°�\ti°�\°4°\°4°°\°ti\tio�\°ti\ti�\°4*\°,\ti;\°ti\,\°ti\tip\°4*\°,\titi
mo Regulatory Date: —Current Plan —Actual
8/1/22
•Current Plan as of 1/1/19 assumes 8.36M tons with a forecast completion date of 2/28/22.
Asheville: 2