20200451 Ver 1_Revised Permit Drawings and Exhibits_20200604

Strickland, Bev
From: Mark S. Davis <[e-mail]>
Sent: Thursday, June 4, 2020 12:38 PM
To: Annino, Amy M
Cc: Joel B. Setzer
Subject: [External] RE: DWR 20200451 - TWSA Little Savannah Water and Sewer Expansion
Project - Additional Information Required
Attachments: Revised Permit Drawings and Exhibits_6-4-20.pdf
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Amy,
In regard to your request for additional information, see the attached revised permit drawings and exhibits. My reply to
your questions, are below:
1. The impervious dike and flow diversion has been incorporated into the permit drawings. We plan on using the
existing rock cross vane with sandbags to serve as the impervious dike for the pump around on this project. A
detailed narrative of the construction sequence to install the sewer line across Cullowhee Creek is included in
the revised permit drawings and exhibits.
2. We have deleted the rip rap bank stabilization at Permit Site 3. The streambank will be stabilized with native
vegetation and coir fiber matting upon completion. A native seed mix detail for Environmental Sensitive Areas
in included in the revised permit drawings and exhibits.
3. The wetland area to be impacted is basically a drainage ditch between the toe of slope of NC 107 and the fill
slope of the State Employees Credit Union parking lot (see attached photo). Heavy equipment will be placed on
mats when working in this wetland area. A narrative for wetland construction is included in the revised permit
drawings and exhibits.
4. The seed mix detail for Environmental Sensitive Areas in included in the revised permit drawings and exhibits.
In regard to the trout buffer variance, less than 100 linear feet of streambank will be disturbed for the Cullowhee Creek
crossing; therefore, no trout buffer variance is required for this project.
In addition, I have also included photos of the permit sites in the revised permit drawings and exhibits for your
information. Riparian vegetation along Cullowhee Creek is very limited in the project area. It appears that only two or
three trees may have to be cut to install the new sewer line (see attached photos). If you have any questions or need
additional information, please advise.
Thanks, Mark

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MARK S. DAVIS, ENVIRONMENTAL SPECIALIST
40 Colonial Square, Sylva, NC 28779
C: 828.508.9670 1 O: 828.477.4993 1 www.vaughnmelton.com
[vaughnmelton.coml
EXPERIENCED, PRACTICAL, DEPENDABLE, FRIENDLY, LOYAL
From: Annino, Amy M <[e-mail]>
Sent: Tuesday, June 02, 2020 11:11 AM
To: Mark S. Davis <[e-mail]>
Subject: DWR 20200451 - TWSA Little Savannah Water and Sewer Expansion Project - Additional Information Required
On April 1, 2020, the Division of Water Resources (Division) received your application requesting a 401 Water Quality
Certification from the Division for the subject project with the appropriate fee received on April 7, 2020. The Divisior
has determined that your application is incomplete and cannot be processed. The application is on hold until the
following items are addressed:
1. Per Condition 9 of GC 4133 (attached), all work must be done in the dry. The permit application indicates that an
"impervious dike and flow diversion" will be utilized for the project. Please provide a detail and a construction sequence
that outlines the method of dewatering to be utilized at the site and the sequence of construction events to be followed
to ensure compliance with this condition. [15A NCAC 02H .0502(b)(3)]
2. This office believes that the permanent bank stabilization (rip rap) proposed along Cullowhee Creek (C) can be
avoided or minimized. The Division would prefer to see a bioengineering approach to bank stabilization at this location.
Please revise the plans to minimize the rip rap impacts or provide a detailed explanation of why this plan for the activity
cannot be practically accomplished, reduced, or reconfigured.
3. Heavy equipment working in wetlands shall be placed on mats or other measures shall be taken to minimize soil
disturbance. [15A NCAC 02H .0506 (b)(3) and (c)(3)] Please provide a detail and a construction sequence that outlines
the method to be utilized at the site and the sequence of construction events to be followed to ensure compliance with
this condition.
4. Please provide the proposed temporary and permanent seed mix to be used in temporarily impacted wetland areas.
[15A NCAC 02H .0506(b)(2) & (c)(2)]
If buffer disturbance is required on Cullowhee Creek (C, Tr), please coordinate with the NC Division of Energy, Mineral,
and Land Resources in the Asheville Regional Office to determine if a trout buffer variance is required for this project.
Pursuant to Title 15A NCAC 02H .0502(c), the applicant shall furnish all of the above requested information by June 30,
2020 for the proper consideration of the application. If all of the requested information is not received, the Division will
be unable to approve the application and it will be returned.
Please let me know if you have any questions.
Amy Annino
Environmental Specialist —Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
2090 U.S. Hwy. 70
Swannanoa, N.C. 28711
828 296 4656 office

984 232 1222 mobile
amy.annino(cancdenr.gov
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Vaughn & Mellon
Consulting Engineers, Inc.
KENTUCKY
606-248-6600
TENNESSEE
865-546-5800
NORTH CAROLINA
828-253-2796
SOUTH CAROLINA
864-574-4775
GEORGIA
770-627-3590
www.vaughnmelton.com
Copyright © 2019
All Rights Reserved
DRAWN: TAR
CHECKED: SSD
JOB NO: 31850-03
SCALE: 1 "=20' H, 1 "=5' V
DATE: JUNE 2020
FILE NAME: SEE PLOT STAMP
DRAWING TITLE:
PERMIT
DRAWINGS
SHEET
1
OF
2
DRAWING NO:

DEWATERING DIAGRAM FOR CULLOWHEE CREEK SEWER LINE CROSSING
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=:-WB WETLAND BOUNDARY
JS JURISDICTIONAL STREAM
NOTE: IMPACT AREAS ARE CALCULATED TO 15' FROM
CENTERLINE OF PROPOSED SEWER LINE.
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GRAPHIC SCALE
8 16
( IN FEET )
1" = 8'

Construction Sequence for Cullowhee Creek Crossing — Dewatering
• Prepare areas outside of stream channel for the installation of 124 linear feet of 20-inch steel
encasement pipe.
• Hand place sandbags on existing rock cross vane structure approximately 50 linear feet upstream
of proposed sewer line crossing in Cullowhee Creek.
• Install pump(s) and by-pass pipe(s) for pump around operation.
• Excavate trench across Cullowhee Creek. Instream materials excavated from stream channel
shall be set aside and used as backfill over the encasement pipe.
• Install encasement pipe/sewer line.
• Backfill streambanks and stream bed. Streambanks shall be backfilled and compacted with clean
soil. Instream backfill shall be with the instream material removed in the excavation of the
trench.
• Re -slope, seed with native vegetation, and stabilize streambanks with an open weave coir fiber
matting.
• Remove pump(s) and by-pass pipe(s).
• Hand remove sandbags from rock cross vane structure.
• Regrade, seed, and mulch all disturbed staging areas.
Construction Sequence for Wetland Area Crossing
• Heavy equipment shall be placed on timber mats when working in wetland areas to avoid
excessive soil disturbance
• Wetland areas will be restored to original contours and seeded with native seed mixes (attached
list).
Native Grass Seeding and Mulching for Environmental Sensitive Areas
Streambanks and Wetlands
Native Grass Seeding and Mulching shall be performed on the disturbed areas of wetlands and
riparian areas, and adjacent to Stream Relocation and/or trout stream construction within a 50
foot zone on both sides of the stream or depression, measured from top of stream bank or center
of depression.
The kinds of seed and fertilizer, and the rates of application of seed, fertilizer, and limestone,
shall be as stated below. During periods of overlapping dates, the kind of seed to be used shall
be determined. All rates are in pounds per acre.
August 1- June 1
18# Creeping Red Fescue
8#
Big Bluestein
6#
Indiangrass
4#
Switchgrass
35#
Rye Grain
500#
Fertilizer
4000# Limestone
May 1—
September 1
18#
Creeping Red Fescue
8#
Big Bluestein
6#
Indiangrass
4#
Switchgrass
25#
German or Browntop Millet
500#
Fertilizer
4000#
Limestone

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Little Savannah Water & Sewer Project Photos
Permit Sites
Permit Site 1 — Streambanks at Sewer Line Crossing of Cullowhee Creek
Permit Site 3 — Wetland Crossing North of NC 107 (Flag Center of Photo)