20221068 Ver 1_More Info Received_20220909

Moore, Andrew W
From: Jeff Golladay <[e-mail]>
Sent: Friday, September 9, 2022 8:26 AM
To: Moore, Andrew W
Cc: [e-mail]; Brown, David W SAW; Leslie, Andrea J; Winston, Joey
Subject: [External] RE: Request for Additional Information, CDMAT, LLC Storage Addition, Henderson County
(DWR Project #20221068)
Attachments: 22203_BASE_082422-STORMWATER PLAN.pdf
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Andrew,
Thank you for the comments. Please see below for our response to each comment in order below:
1. The Division believes the stream impact may be avoided and/or minimized by constructing a retaining wall at the
southeastern end of the project area, relocating the stream, or a combination of the two. Please revise the plans
to include a retaining wall and/or stream relocation or clearly explain why these avoidance and minimization
measures cannot reasonably be achieved. [15A NCAC 02H .0506(b)(1)]
The proposed culvert extension is necessary to appropriately grade the site and building pads. Due to the steep
slopes along the stream banks, an 8-10' retaining wall for 200 feet would be required to avoid the stream,
incurring significant additional costs to the developer. The costs associated with the installation of a retaining
wall in the suggested location is estimated to exceed the cost of the proposed culvert by 5+ times. Additionally,
the proposed culvert ties into an existing culvert, which is called out and highlighted on the attached site plan.
The developer intends to utilize the existing culvert crossing to access the south adjacent parcel to obtain fill
material for use in the initial grading the subject property. Given these considerations, the developer believes
the installation of a retaining wall is not reasonably achievable and that the proposed culvert impact is the
minimum achievable.
Please do not hesitate to call if you have any additional questions.
Thank you,
Jeff Golladay
Biologist
CLearWaLer
An EnviroScience Company
145 7th Avenue West, Suite B
Hendersonville, NC 28792
Office: 828-698-9800 ext. 304
Mobile: [phone]
[e-mail] WWW.CWENV.COM
WWW.EnviroSciencelnc.COM
OH I TN I VA I WV I NC 1■ CHID
From: Moore, Andrew W <[e-mail]>
Sent: Thursday, September 1, 2022 4:49 PM
1

To: Jeff Golladay <[e-mail]>
Cc: [e-mail]; Brown, David W SAW <[e-mail]>; Leslie, Andrea J
<[e-mail]>; Winston, Joey <[e-mail]>
Subject: Request for Additional Information, CDMAT, LLC Storage Addition, Henderson County (DWR Project #20221068)
Jeff,
On August 8, 2022, the Division of Water Resources (Division) received your application requesting a 401 Water Quality
Certification from the Division for the subject project. The Division has determined that your application is incomplete
and cannot be processed. The application is on -hold until all of the following information is received:
1. The Division believes the stream impact may be avoided and/or minimized by constructing a retaining wall at
the southeastern end of the project area, relocating the stream, or a combination of the two. Please revise the
plans to include a retaining wall and/or stream relocation or clearly explain why these avoidance and
minimization measures cannot reasonably be achieved. [15A NCAC 02H .0506(b)(1)]
Pursuant to Title 15A NCAC 02H .0502(e), the applicant shall furnish all of the above requested information for the
proper consideration of the application. Please provide your response by September 30, 2022. If all of the requested
information is not received, the Division will be unable to approve the application and it will be denied as incomplete.
The denial of this project will necessitate reapplication to the Division for approval, including a complete application
package and appropriate fee.
Feel free to contact me if you have any questions.
Andrew W. Moore, PG
Environmental Specialist II — Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
828 296 4684 office
email: [e-mail]
2090 U.S. Hwy. 70
Swannanoa, N.C. 28778
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
2

0
Plotted on:
(DENNIS DORN)\DWG\22203_BASE_082422.dwg
SUGARLOAF STORAGE FACILITY
Z:\2022\22203
wing name:
0
Total drainage area(Acres)
Impervious drainage (Acres)
First Flush depth (in)
Percent Impervious
RUNOFF VOLUME — SIMPLE METHOD
Rv= 0.05 + 0.9*IA
Where:
302,742
196,456
64.892086
Rv= Runoff coefficient [storm runoff (in /storm rainfall (in)], unitiess
IA= Impervious fraction [impervious portion of drainage area (ac)/drainage area (ac),
Rv = 0.63
VOLUME OF CELL DETERMINATION
V = 3630*RD* Rv*A
Where:
V = Minimum volume of pond from perm pool to temp pool (ft3)
RD = Design storm rainfall depth (in)
A = Watershed area (ac)
Min Vol. (cuft) = 15996
SURFACE AREA REQUIRED - SA/DA AVERAGE DEPTH METHOD
SA/DA Required from Table 1 of BMP Manual:
Surface Area Required =
Surface Area Provided =
1.77
5358.5334 sf
0 sf
This is the Surface Area Provided at Elevation 780. The vegetated shelf is not submerged
Elevation Area
2152
2154
2156
2158
2160
6089
8400
10131
11945
2900
Inc. Vol
7244.5
9265.5
11038
7422.5
LUFItC1: /L.JJU
Total Vol
0
7244.5
16510 permanent pool
27548 shelf top
34970.5 temporary pool
Storage vol above
temp pool
NOTE: MINIMUM SURFACE AREA $
VOLUME REQUIRED forBIVPWET POND
THE SURFACE AREA AND VOLUIVE FOR THE
CONVERSION FROM SEDIMENT BASIN TO
WET POND WITH FOREBAY IS ACHIEVABLE.
i PP
I
I
I
I
I I
I I
I I
I I
3/4" El
0.' above group
•
EX 5" HOLE IN CAPPE
1 2" HDPE PIPE SHALL
BE REPLACED WITH 3X3
PRECAST BOX WITH SKIMMER
ATTACHED AT INV. 2 15 I .00
x
x
x
39. I\
41 .4'
\ PT
\
\ Building
\
\
15" CMP
—x—
Gate
\ Gravel
7
7
7
C/B
Crosswalk
\ ■
\\\
\
\1
11
Metal Building
Approx. 12,700 ;,c;t. Ft.
CD -Mat LLC
of D.B. 1496, Pg. 698
Plat 51ide
/CD -MAT, LLC
D.6. 1496, Pg. 698
I / Plat- Slide 8423
/
:....,' li:e n cap
.-0
7
/
///
/// /
// /
///
/ /
7
7
7
7
Column
Gate
Contrml
Panel
Qo
7
❑ Mailbox
7
Concrete
7
7
/
/ /
o / /
/ c
/ e?ma
i
/ /
/ /
/ /
60 / /
/ /
/
/
/
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7
//
2170
0X70 SITE TRIANGLE
(TYPICAL)
ermanert Wetland Impact
Wetland Impact W2
0.002 AC
2170
7
7
Berm
X
0
Column
Conerete
/
Column W/ Contr/ol Panel
7
/
PROP AB # I with
INLET PROTECTION
RIM = 2163.75
INV IN =
Grct .INV OUT = 2155.75
f-oncrete
/
/
/
7
7
A
k
Lo_ A
O
/
/
/
/
/
FT 1 0X70 SITE TRIANGLE
(TYPICAL)
/
/
2166
i
2164
Ll/P �� ohu
-40.8' 21 62/
NDP� @ .35*
— g"0
-12/\-ofi
.,�.- �__- _•
al. WI'
�— r
/
/ ,....,..../)(
/X
*
2I84 /
ERMANENT STREAM IMPACT
STREAM IMPACT 5 I
108 LF (0.010 AC)
FOR NEW 36" HDPE PIPE
INSTALLATION
Thompson
D.B. 1599, Pg. G7I
Zoned: RI 5
GRAPHIC SCALE
1 INCH = 30 FEET
JOB NUMBER:
22203
I HEREBY CERTIFY THAT THIS
PLAN AND SPECIFICATION
WAS PREPARED BY ME OR
UNDER MY DIRECT
SUPERVISION AND THAT I AM
A DULY REGISTERED
ARCHITECT OR ENGINEER
UNDER THE LAWS OF THE
STATE OF NORTH CAROLINA
AS SIGNIFIED BY MY HAND
AND SEAL.
SCALE: I " = 40'
DATE: 06/03/2 2
DRAWN BY: BSR
CHECKED BY: DWO
PROJECT MGR: BSR
SHEET: