20052253 Ver 4_More Info Received_20130412

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Charles Wakild, P. E. John E. Skvarla, III
Governor Director Secretary
March 14, 2013
John Koenig, Inc.
DWQ #: 2005 -2253 v4
Onslow County
235 John Koenig !_N. 0235 Green Street �Fayetteville, NC 28301
Subject: REQUEST FOR ADDITIONAL INFORMATION AP1 2 E�'
Williamsburg Plantation Subdivision ,-
Dear Mr. Koenig:
On February 15, 2013, the Division of Water Quality (Division) received your application requesting a
401 Water Quality Certification for your project. The Division received the February 4, 2013 Public
Notice from the U.S. Army Corps of Engineers on February 7, 2013. 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 would like to have a better overview map of the entire subdivision that shows the
Impacts and their location. The map in the application covers up the impact with the impact
letter. This can be done in two parts and can be sent to the Division digitally so we can print it
out in the appropriate size.
2. The cross sectional drawings need to show a fill slope line or proposed contour lines on the plan
view. The Division needs to identify the toe-of slope for future compliance purposes.
3. The drawings also need to show a riprap pad if one is to be installed on the outlet ends of the
pipes.
4. Show on the drawings the length of pipe to be used and separate out the impacts due to riprap.
Include any temporary impacts that will be required to set the pipes in appropriately (usually
there is a temporary impact necessary to get the pipe to align correctly with the stream and the
area needs to be dug out further than the impact to get the pipe in correctly).
5. Indicate on the drawing with the double pipe that one will be placed at the flood plain level to
catch the storm events and if not indicate if a sill in the pipe(s) will be used to keep the stream
in original channel and to keep the channel from flattening out due to the width of the pipes.
Show a cross section looking down the pipe to show these features. The DOT website has really
good explanations and drawings showing these issues and solutions.
Y.'et w4s, buff, fs, Sion 'ar. - .oml iaw�3 anu Oe -it-g ,Net.wpel Un,i One
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Williamsburg Plantation Subdivision
Page 2 of 2
March 14, 2013
Pursuant to Title 15A NCAC 02H .0502(c), the applicant shall furnish all of the above requested
information for the proper donsideration of the application. If all of the requested information is not
received in writing within 30 calendar days of receipt of this letter, the Division will be unable to
approve the application and it will be returned. The return of this project will necessitate reapplication
to the Division for approval.
Respond in writing within 30 calendar days of receipt of this letter by sending four copies of all of the
above requested information to the Wetlands, Buffers, Stormwater —Compliance and Permitting
(Webscape) Unit, 1650 Mail Service Center, Raleigh, NC 27699 -1650.
Please be aware that you have no authorization under Section 401 of the Clean Water Act for this
activity and any work done within waters of the state may be a violation of North Carolina General
Statutes and Administrative Code.
Contact Joanne Steenhuis 910 - 796 -7215 if you have any questions.
Sincerely,
�&-W l
Karen Higgins, Supery o
Wetlands, Buffers, St ater — Compliance &
Permitting Unit
cc: Samual Adam Carter, Wetland Solutions, LLC, PO Box 244, Bunnlevel, NC 28323
David Bailey, USACE Wilmington Office
Joanne Steenhuis, DWQ —Wilmington Regional Office
File Copy
File name: 052253v4WllliamsburgPlantationSD (Onslow)401_IC_Hold.docx

205-3 Ward Road
Swansboro, NC 26584
Tel: [phone]
Fax: [phone]
To: John L Pierce & Associates
ft Williamsburg Plantation Crossings
From: David K. Newsom
Date: April 8, 2013
❑ Urgent ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle
Attached:
Calcs for Crossings F, I and N
LEG O
APR 1 2 2013

Peak Flow Determination for Large (> 10 Ac) Watersheds
Project: Willamsburg Plantation Crossing "F" Crystal Coast Engineen •PA
. I R
Pipe: Future Street at Crossing "F" 205-3 Ward Road ` Q� O
•� By: DKN Swansboro, NC 28584 ' ���EES ,U
Date: 3/30/2013 910 - 325 -0006 SE
Business License: C -2553 is 8
Using USGS Regression Equations for NC Coastal Plain: �' f
Q10 = 188DA0.eis ;, 90��E3ftvE�Pc•O
Qzs = 281DA0.593
Qso = 367De"'
Area = 66.2 Ac
DA= 0.1034 Sq miles
so:
Qio =
46.6 cfs
Qu =
73.2 cfs
Q100 =
98.7 cfs
Using Rational Method:
Q =CIA
where:
Ccum =
0.40 (Qdev =0.45, Qundev =0.15)
110=
4.38 (at duration= tc)
125=
5.04 (at duration = tc)
1100=
6.13 (at duration = tc)
Tc=0.0078(1.3/h).381
where:
D= 3000
h= 18
Tc=
26.6 say 30 min
so:
Q10 = 116.0
Q25 = 133.5
Q200 = 162.3 /

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PROJECT:,,//// 1 i •'•E ^ �. i !!!,�
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DESIGNER:
`Y
it
DATE:
HYDROLOGIC AND
CHANNEL INFORMATION
SKETCH
STATION
EL.��
;
Q I o= i ,
T WI =
AHW= t; i
.
TW2
EL: F iL• so° �--"?
-T TW
T
/ 0, = DESIGN DISCHARGE
I\
, SAY 025 \
EL ="
MEAN STREAM VELOCITY=
02 CHECK DISCHARGE SAY 050 oR o100 J
MAX. STREAM VELOCITY=
CULVERT
HEADWATER
COMPUTATION
?
r
INLET CON T.
OUTLET CONTROL HW =H + ho -LSo
DESCRIPTION
0
SIZE
0 i
o
COST
COMMENTS
HW
D
HW
K e
H
IC
��
TW
ho
LSO
HW
(ENTRANCE TYPE)
H
o
J
o>
2
v
j
i
`Y

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PROJECT: X,!
DESIGNER:
n
DATE:
HYDROLOGIC AND CHANNEL INFORMATION
SKETCH
t STATION
EL.' t
It
AHW=` 1 rr1
OI = TIN =
T W
I�r. --,
J
=
—
71'7 7 EL
(0, DESIGN DISCHARGE , SAY 025
LIEAN STREAM VELOCITY
Q = CHECK DISCHARGE SAY 0 OR 0
z so loo /
MAX. STREAM VELOCITY=
CULVERT
HEADWATER COMPUTATION
z
T
INLET CONT.
OUTLET CONTROL HW =H + ho -LSO
DESCRIPTION
0
SIZE
s i
5 o
COST
COMMENTS
D
HW
Ke
H
do
dc+D
TW
ho
LSO
HW
(ENTRANCE TYPEI
0;

Peak Flow Determination for Large (>I 0 Ac) Watersheds
Project: Willamsburg Plantation Crossing "I" Crystal Coast Engineering, PA
Pipe: Future Street at Crossing "1" 205-3 Ward Road
By: DKN Swansboro, NC 28584 (N C
Date: 3/30/2013 910-325-0006 •Qp S��M��
Business License: C -2553
Using USGS Regression Equations for NC Coastal Plain: EAL
188DA0.615 5143 f/
Q30
Q25 = 281DA 0.593 '�,G1NE�P. OAS
Qso = 367DAo.s29 K. N�
Iti Z�// T
Area = 63.7 : Ac
DA= 0.0995 Sq miles
so:
010 =
45.5 cfs
(In =
71.5 cfs
Q10 =
96.5 cfs
Using Rational Method:
Q =CIA
025 =
where:
Q100 =
Ccum =
0.36 (Qdev =0.45, Qundev =0.15)
110=
4.38 (at duration = tc)
125=
5.04 (at duration = tc)
1100=
6.13 (at duration = tc)
Tc= 0.0078(I-3/h).385
where:
D= 4000
h= 39
Tc=
27.5 say 30 min
so:
010 =
100.4
025 =
115.6
Q100 =
140.6

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PROJECT— l t" .:1. ?> l
�-- -'
fif 1 ,
� DESIGNER:
?`r `
DATE: !2—,� Z"
HYDROLOGIC AND CHANNEL INFORMATION
SKETCH
STATION
E L. W
f , ,r,
AHW=
02 = , t 11 TW2 —
TW
ELl1JiJ
EL�-
01 o DESIGN DISCHARGE , SAY 025
1
MEAN STREAM VELOCITY=
02 = CHECK DISCHARGE , SAY 0S0 OR 0100
J
MAX. STREAM VELOCITY=
CULVERT
HEADWATER
COMPUTATION
z
,
DESCRIPTION
O
SIZE
0 i
-10
cosy
COMMENTS
INLET CONT.
OUTLET CONTROL HW =H + h° -LSO
p
HW
Ke
H
d°
dc+D
TW
ho
LSO
HW
(ENTRANCE TYPE)
9
°>
2
u
1�
't •l
� .J
L o.�
--V
C• �
.�
�a
Tji1
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✓
1
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8
l
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? • t i --
Y
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Peak Flow Determination for Large (>I 0 Ac) Watersheds
Project: Willamsburg Plantation Crossing "N" Crystal Coast Engineerirwj�M.,,,,
Pipe: Future Street at Crossing "N" 205-3 Ward Road CARO
O P fESSrV�� /y1,
By: DKN Swansboro, NC 28584 ' � •O 9,•yj
Date: 3/30/2013 910-325 -0006 - EA1
JI All
Business License: C -2553 = ' 18148 !/
Using USGS Regression Equations for NC Coastal Plain:
Q10 188DAo.eis O ••• P.: A
Q25 = 281DAo.113
Q100 = 468DA °'566
Area = 453.7 Ac
DA= 0.7089 Sq miles
so:
Ql° = 152.1 cfs
C6 =
229.1.1.
Q10 = 385.2 cfs U
Using Rational Method:
Q =CIA
Q25 =
where:
Q100 =
Ccum =
0.34 (Qdev =0.45, Qundev =0.1!
110=
2.85 (at duration = tc)
125=
3.36 (at duration = tc)
1100=
4.22 (at duration = tc)
Tc= 0.0078(L3/h)"
where:
D= 7600
h= 40
Tc=
57.2 say 60 min
so:
Qio =
439.6
Q25 =
518.3
Q100 =
651.0
u�� TCCxl��it� �IZ�;�UIV
v
j
u�� TCCxl��it� �IZ�;�UIV
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PROJECT: % ' r `° rZ
L4- . "f"l /
DESIGNER:
DATE:
HYDROLOGIC AND CHANNEL INFORMATION
SKETCH
STATION
o t1
E L. ,
AHW =j�T /
TW2 -
EL3 °_� IF TW~
t
/ 01 = DESIGN DISCHARGE , SAY 025
EL <<
MEAN STREAM VELOCITY= J
j\ 02 = CHECK DISCHARGE SAY 050 OR 0 10 i
MAX. STREAM VELOCITY=
CULVERT
j
HEADWATER
COMPUTATION
Z
r
INLET CONT.
OUTLET CONTROL HW =H + h0 -LSO
DESCRIPTION
�0
LL
SIZE
o ;
x
��
H p
COST
COMMENTS
H WW
D
HW
Kg
H
dc
+
TW
h°
LSO
HW
(ENTRANCE TYPE)
,
o
Ll
vt
I

C:
min

G: \Projects \KOENIG WETLANDS 2012 \dwg \LOT_LAYOUF2013.dwg, 4/10/2013 9:32:14 AM, brianjarman