20201288 Ver 2_More Info Received_20240108

January 8, 2024
NC Division of Water Resources
401 and Buffer Permitting Unit
Attn: Sue Homewood
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: North Creek Village Phase II - +/- 84.716 acres
17705 Davidson -Concord Rd Huntersville, NC 28078
Nationwide Permit 29, 39, and 58 Application
Action ID: SAW-2008-02707 / DWR Project #: 2020-1288
Sue,
1. A site visit has been scheduled with DWR and the USACE to verify jurisdictional features on site
and to verify intermittent/perennial stream determinations. Modifications may be necessary
and/or additional information may be required upon conclusion of the site visit.
• The site visit occurred on December 05, 2023. No modifications were requested.
2. Impact drawings provided do not indicate that riprap dissipators will be installed at culvert
outlets. It is DWR's experience that energy dissipation is typically required by NCDEML or local
government Sediment and Erosion Control program. Please clarify if riprap aprons are proposed
and if so, please clearly show them as a separate entity in the table of impacts and on impact
plan sheets and culvert profiles.
• Revised drawings including the dissipater pad and impact table has been included
within this response package.
3. The culvert at impact S2 does not appear to be in alignment with the stream channel at the
outlet. Poor alignment typically results in streambank erosion and downstream sediment
deposition. Please revise the culvert installation to provide better alignment with the stream
channel. If proper alignment results in changes to impact lengths, please adjust the impact table
and mitigation requirements accordingly.
• The revised drawings include a revision to this culvert alignment.
4. The temporary impact S7 shows sewer line installation immediately downstream of the
road/culvert installation. Please explain why the sewer line could not be installed within the
roadway impact area to reduce impacts to the stream.
• The sewer line has been designed in its proposed location due to the construction
sequence and for maintenance/accessibility. The sewer line will be installed before
the construction of the roadway. Additionally, if maintenance is required installing
the designed alignment would prevent damage to the road. Charlotte Water will be
operating the line once construction is completed. The line will be serving
apartments in Phase 2 before the road construction.
ATLAS Environmental, Inc.
338 S. Sharon Amity Road, #411
Charlotte, North Carolina 28211
704-512-1206 (o) / 828-712-9205 (m)
www.atlasenvi.com / Offices in Asheville and Charlotte

S.7 ,
Please clarify the purpose of Impact S3. It appears that the pond grading does not match the
impactshading.
• Impact S3 is for the permanent fill associated with the pond grading. Impact S9 is
identified as secondary impacts.
Please provide plans sheets and construction details which clearly show that all instream work
will be conducted "in the dry". The impact table does not list any temporary impacts for
dewatering during culvert installation.
• All proposed in stream work will be completed in the dry by establishing a de -watering
zone by using a pump around system to prevent flowing water in the work area. The
pump around system includes one pump to move water around the work area and a
second smaller pump to de -water seepage from the work area. The coffer dam will be
constructed from non-erodable materials and will not alter the bed or banks of the
channel. A pump around detail has been included within this response package.
7. For sewer line crossings of streams, where temporary impacts are proposed, please provide a
stream restoration detail sheet.
• A stream restoration detail sheet has been included within this response package.
Best regards,
Jacob Sinclair P.G., PWS
Atlas Environmental Inc.
Senior Environmental Specialist
ATLAS Environmental, Inc.
338 S. Sharon Amity Road, #411
Charlotte, North Carolina 28211
704-512-1206 (o) / 828-712-9205 (m)
www.atlasenvi.com / Offices in Asheville and Charlotte

EXAMPLE OF PUMP -AROUND OPERATION
NOTES:
1) All excavation shall be performed in only dry or isolated
areas of the work zone.
2) Impervious dikes are to be used to isolate work from
stream flow when necessary.
3) Maintenance of stream flow operations shall be incidental
to the work. This includes polyethylene sheeting, diversion
pipes, pumps and hoses.
4) Pumps and hoses shall be of sufficient size to dewater
the work area.
EW&KWAL
VV 61
- •
Silt Bag
IMPERVIOUS DIKE
(SEE PROJECT SPECIAL PROVISIONS)
TEMPORARY
FLEXIBLE HOSE
Siff Bag
1 DEWATERING PUMP
1
1
1
1
1 EXISTING STREAM
� CHANNEL
I
I
CULVERT
1
I
1
ow
PUMPAROUND
TOP OF BANK
SEQUENCE OF CONSTRUCTION FOR TYPICAL WORK AREA
1. INSTALL SPECIAL STILLING BASIN(S).
2. INSTALL UPSTREAM PUMP AND TEMPORARY FLEXIBLE HOSE.
3. PLACE UPSTREAM IMPERVIOUS DIKE AND BEGIN PUMPING
OPERATIONS FOR STREAM DIVERSION.
4. PLACE DOWNSTREAM IMPERVIOUS DIKE AND PUMPING
APPARATUS. DEWATER ENTRAPPED AREA.AREA TO BE DEWATERED SHALL
BE EQUAL TO ONE DAY'S WORK.
5. INSTALL CULVERT(S) IN ACCORDANCE WITH THE PLANS.
6. EXCAVATE ANY ACCUMULATED SILT AND DEWATER BEFORE REMOVAL
OF IMPERVIOUS DIKES. REMOVE IMPERVIOUS DIKES, PUMPS, AND
TEMPORARY FLEXIBLE HOSE. (DOWNSTREAM IMPERVIOUS DIKES FIRST).
7. REMOVE SPECIAL STILLING BASIN(S) AND BACKFILL. STABILIZE DISTURBED AREA
WITH SEED AND MULCH.
IMPERVIOUS DIKE
Project Name: North Creek Village Phase II
Location: 17705 Davidson -Concord Road Huntersville, NC 28078
For: Magnolia Huntersville II LLC Attn: Stephen Vinson
Coordinates: 35.453766,-80.800917 Date: November 10, 2023

Notes:
Not to scale.
Stream Restoration Plan for Temporary Sewer Line Trenching
Lengths and widths may vary depending
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on channel dimensions.
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Plan View
Existing channel substrate/material will
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be stockpiled for use in restored channel.
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Matting will be coir fiber and secured with
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hardwood stakes.
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A pump around zone will be established
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using non -erosive materials to prevent
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flowing water in the work area as
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Channel Bed and OHWM
necessary. A de -watering pump may be
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restored to preexisting condition
required if seepage is present.
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No stilling basins are proposed.
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The OHWM and channel substrate will be
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2:1 slope
restored at the preexisting condition
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includingslope, cross sectional area, and
p
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elevation.
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Existing ground and
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entrenched channel
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Matting to stabilize
temporary impact area
Banks sloped to — 2:1 after
Channel Bed and OHWM
temporary impact
restored to preexisting
Profile
condition
Project Name: North Creek Village Phase
II
RQ C
Location: 17705 Davidson -Concord Rd Huntersville,
NC 28078
ONMENTAL
For: Magnolia Huntersville II LLC Attn:
Stephen Vinson
Coordinates: 35.453766°,-80.800917'
Date: November 10, 2023
Figure:

�OPp P EXISTING RIGHT OF WAY /
EXISTING TREE LINE
C7
Qe�Sj 'O� STREAM CH 600 ±66 LF /
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±0.047 AC
o EXISTING BUILDING
WETLAND WL 1200
±0.002 AC
° STREAM CH 500 ±96
LF
TH jai
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RTH CREEK PHASE 1
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STREAM CH 100 ±3,177 LF
STREAM CH 400 ±72 LF
PROPERTY LINE /
- STREAM CH 300 ±65 LF /
T WETLANDS WL 1000 ±0.001 AC
— HIGH WATERMARK
11
STREAM CH 200 ±1,934 LF t
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/
— —
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IMPACTS
COleJenest&Stone NORTH CREEK
BOLTON & NENK,INC. 12.07.23
0 400 800
HORZ.
SCALE FEET Z

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CLEAN WATER
BYPASS SYSTEM TO
MAINTAIN STREAM
HYDROLOGY
Colelenest&Stone
BOLTON & MENK,INC.
Al
FUTURE COMMERCIAL
DEVELOPMENT
PROPOSED1'CONTOURS
STREM MPAT
300L F,10.0 3CAcS1
LIMITS OF STREAM IMPACT
OHWM
wiviom
/ PROPOSED RETAINING
WALL, TYP.
Stream Impact S10
Embedded R1prap
— 20 LF, 0.001 Ac
0
I M PACT S1 0 50 100
NORTH CREEK HORZ. Z
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740 740
FINISHED ROAD GRADE
EXISTING GRADE
PROPOSED CLEAN
WATER STORM SYSTEM
TO MAINTAIN STREAM
HYDROLOGY
0+00 1 +00 2+00
SECTION S1 0 80 160
(D Colelenest&Stone NORTH CREEK HORZ.
BOLTON & MENK,INC. 12.07.23 SCALE FEET

LIMITS OF
STREAM IMPACT
Stream Impact S13
40 LF (20' above 20' below)
PROPOSED
------------------
STORM CULVERT
STREAM IMPACT S2
67 LF, 0.005 Ac
TEMPORARY STREAM
IMPACT S7 ±17 LF
±0.0008 AC (36 SF)
OHWM \
Stream Impact S11
Embedded 1 Ac
15 LF, 0.001 Ac
PROPERTY LINE
LIMITS OF \
STREAM IMPACT \
\
0
Stream Impact S3
Permanent Fill
28 LF, 0.001 Ac
Stream Impact S9
Secondary Impacts
53 LF, 0.003 Ac
i
Colelenest&Stone
BOLTON & MENK,INC.
IMPACT S2 0 40 80
NORTH CREEK HORZ.
Z
12.07.23 SCALE FEET

SECTION S2 0 60 120
Colelenest&Stone NORTH CREEK HORZ.
/ 1 BOLTON & NEN141NC. 12.07.23 SCALE FEET

\
SANITARY SEWER
LINE, TYP.
ORDINARY HIGH PROPOSED
WATER MARK _ STORM CULVERT \
STREAM IMPACT S4
/ ±68 LF
±0.009 (402SF)
Stream Impact S14
40 LF (20' above 20' below)
a
LIMITS OF
STREAM IMPACT
Stream Impact S12
Embedded Riprap
16 LF, 0.002 Ac
i
Colelenest&Stone
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I M PACT S4 0 40 80
NORTH CREEK HORZ.
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12.07.23 SCALE FEET

SECTION S4 0 80 160
Colelenest&Stone NORTH CREEK HORZ.
1 BOLTON & MENIC,INC. 12.07.23 SCALE FEET

i
58 STREAM IMPACT S5 55
5LF,0.001Ac 54 53 52
� \ STREAM IMPACT S6
\\ \ Temporary Trenching
\ \ - 20 LF, 0.001 Ac
\
\
Stream Impact S8 LIMITS OF STREAM /
Temporary Trenching IMPACT /
1 \
ORDINARY HIGH
WATER MARK
LIMITS OF
STREAM IMPACT / \
\ \
\ \ PROPOSED SANITARY
\ \ SEWER, TYP
IMPACT S5
Colelenest&Stone NORTH CREEK
BOLTON & MENK,INC. 12.07.23
0 50 100
HORZ.
z
SCALE FEET 4 )

Impact
Name
Flow
LF
Ac
Duration
Reason
S1
CH 100
Intermittent
300
0.013
Permanent
Culvert
S2
CH 100
Intermittent
67
0.005
Permanent
Culvert
S3
CH 500
Intermittent
28
0.001
Permanent
Fill
S4
CH 100
Perennial
68
0.009
Permanent
Culvert
S5
CH 400
Intermittent
5
0.001
Permanent
Fill
S6
CH 300
Intermittent
20
0.001
Temporary
Sewer Installation
S7
CH 100
Intermittent
17
0.001
Temporary
Sewer Installation
S8
CH 400
Intermittent
28
0.001
Temporary
Sewer Installation
S9
CH 500
Intermittent
53
0.003
Permanent
Secondary Impacts
S10
CH 100
Intermittent
20
0.001
Permanent
Embeddd Riprap
S11
CH 100
Intermittent
15
0.001
Permanent
Embeddd Riprap
S12
CH 100
Perennial
16
0.002
Permanent
Embeddd Riprap
S13
CH 100
Intermittent
40
n/a
Temporary
De-Watering/Pump Around
S14
CH 100
Perennial
40
n/a
Temporary
De-Watering/Pump Around