20210689 Ver 1_PreFiling 30-Day Clock Reached Email_20210502

Strickland, Bev
From: [e-mail]
Sent: Sunday, May 2, 2021 12:00 AM
To: [e-mail]
Cc: Homewood, Sue
Subject: Pre -Filing Time Clock has been reached for Asheville Regional Airport Area 1
Structural Fill Permanent Cap System - 20210689 Ver 1
Attachments: DWR Pre -Filing Meeting Request Form.pdf
The North Carolina Division of Water Resources has received the Pre -Filing Meeting Request Form for Asheville Regional
Airport Area 1 Structural Fill Permanent Cap System that you submitted on 4/1/2021. The ID number for that project is
20210689, Version 1.
Your Pre -Filing Meeting Request has now reached the 30 calendar days' requirement and your application can now be
accepted.
When you submit your application please upload a copy of the attached document in this email.
This email was automatically generated by Laserfiche workflow. Please do not respond to this email address, as
responses are not monitored.
Internal Use only: Non Transportation
i

DWR Pre -Filing Meeting Request Form
ID#*
Regional Office*
Reviewer List*
20210689
Version*
Central Office - [phone]
Sue Homewood
Pre -Filing Meeting Request submitted 4/1/2021
Contact Name *
Contact Email Address*
Project Name*
Project Owner*
Project County*
Owner Address:
1
David Vance
[e-mail]
Asheville Regional Airport Area 1 Structural Fill Permanent Cap System
Duke Energy Progress, LLC
Buncombe
Street Address
526 South Church Street
Address Line 2
City State / Province / Region
Charlotte NC
Ibstal / Zip Code Country
28202 USA
Is this a transportation project?* r Yes r No
Type(s) of approval sought from the DWR:
F 401 Water Quality Certification - I— 401 Water Quality Certification -
Regular Express
fJ Individual Permit I— Modification
F Shoreline Stabilization
Does this project have an existing project ID#?*
r Yes (' No
Do you know the name of the staff member you would like to request a meeting with?
Please give a brief project description below and include location information. *

Duke Energy Progress, LLC (Duke Energy) is proposing to install a
remedial nonpermeable permanent cap (permanent cap) over coal
combustion residuals (CCR) used as structural fill at Area 1 of the
Asheville Regional Airport (ARA) in Buncombe County, North
Carolina. Area 1 is an 18-acre, CCR structural fill situated near the
northeastern ARA property boundary and was previously constructed
to expand airport operations. As -built drawings prepared by Charah
in 2010 indicate that Area 1 was constructed with a geosynthetic clay
liner (GCL) base liner and soil cap system. Soil backfill was
compacted on the GCL above and within 50 feet of the 60-in. RCP
that divides the Area 1 structural fill into western and eastern
components. The existing soil cap system was constructed with
approximately 6-ft and 2-ft thick soil layers on the top deck and side
slopes, respectively. In August 2019, NCDEQ requested that a
permanent cap system be designed to "abate the infiltration of
groundwater and/or precipitation into Area 1" and "to abate or control
...seepage water".
Duke Energy is proposing to construct a permanent cap for Area 1 to
comply with NCDEQ Solid Waste regulations for containment of CCR
and to achieve required stormwater runoff capture requirements
(Project). The proposed Project consists of a composite soil
geomembrane liner system designed to prevent and minimize surface
water infiltration into Area 1 structural fill, manage surface water, and
limit hydraulic head on the geomembrane. The proposed Project is
comprised of two components: 1) permanent non -permeable cap
layer system and 2) sediment and stormwater surface water ponds
(dry detention).
The permanent cap will be installed entirely within uplands and is
designed to shed surface water and to drain water infiltrated within
the cap to minimize potential ponding atop the geomembrane layer.
Stormwater drainage is designed to limit route length and will be
conveyed in three general directions off the cap: (i) east-northeast to
stormwater pond 1; (ii) west then northwest to stormwater pond 2;
and (iii) south to an existing stormwater channel towards Wright
Brothers Way.
Two existing sediment basins will be redeveloped and re -graded to
manage the construction and post -construction stormwater runoff
and sediment. The re -graded basins will also facilitate installation of
the permanent cap and achieve stormwater runoff capture
requirements. The surface water ponds are also designed as dry
ponds to release stormwater within 48 hours pursuant to Federal
Aviation Administration (FAA) regulations as not to attract nuisance
wildlife.
An existing underground stream (Unnamed Tributary to French Broad
River) daylights at the northwest toe of Area 1 and contributed to
erosion of the existing perimeter pond dike structure. As such, a rock
drain is proposed to convey the base stream flow beneath the pond;
while an outlet control structure and perimeter berm is proposed to
retain stormwater runoff prior to release into the existing stream.
The redevelopment and re -grading of the stormwater ponds will result
in approximately 0.56-acre of impacts to a non -tidal freshwater marsh
by stormwater pond and the installation of the outlet control structure
WI! result in 12 linear feet of permanent fill impacts to the Unnamed
Tributary to French Broad River).

Please give a couple of dates you are available for a meeting.
4/29/2021
4/20/2021
4/19/2021
4/28/2021
4/27/2021
Please attach the documentation you would like to have the meeting about.
pdf only
By digitally signing below, I certify that I have read and understood that per the Federal Clean Water Act Section
401 Certification Rule the following statements:
• This form completes the requirement of the Pre -Filing Meeting Request in the Clean Water Act Section 401 Certification
Rule.
• I understand by signing this form that I cannot submit my application until 30 calendar days after this pre -filing
meeting request.
• I also understand that DWR is not required to respond or grant the meeting request.
Your project's thirty -day clock started upon receipt of this application. You will receive notification regarding meeting location
and time if a meeting is necessary. You will receive notification when the thirty -day clock has expired, and you can submit an
application.
Signature
Submittal Date 4/1/2021