20120348 Ver 1_More Info Received_20121009

Civil & Sanitary Engineering
Land Planning
Land Surveying
a. EdwauI6 d eem p an*
333 Wade Avenue — PO Box 10422
Raleigh, North Carolina 27605
October 8, 2012
Karen Higgins
NCDENR
1650 Mail Service Center
Raleigh, NC 27699 -1650
Marquee Station (S2716)
Karen:
Tel: 919 - 828 -4428
Fax: [phone]
Email: �i a(a�iueca cam
Please find the responses below corresponding to the numbers for request for more information.
1. The plans have been revised to correct a typo and now matches the supplemental form. WQv
calculations have been included in submittal which are based on 2.4 Ac total drainage area
with 1.6 Ac. being impervious and 0.8 Ac. managed areas (includes 0.55 Ac. offsite
drainage).
2. Proposed bioretention does not have an IWS, revised supplemental form has been included.
3. See sheet CE -3 for the bioretention details.
4. The attached stormwater calculations include routing calculations for the bioretention and
velocity leaving the outflow pipe for the I Oyr storm. The velocity was found to be less than
2fps, or non - erosive.
Please feel free to contact me if you have questions or require additional information.
Sincer ,
Jon Callahan

Permit Number
(to be provided by DWQ)
r ► �F W ATgq
AN
NC®ENR T
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information
I. PROJECT INFORMATION
Project name Village at Marquee Station
Contact name Jon Callahan
Phone number 919- 828-4428
Date 8162012
Drainage area number
II. DESIGN INFORMATION ;
Site Characteristics
Drainage area 104,544 ft2
Impervious area 67,953 ftZ
Percent impervious 650% %
Design rainfall depth 10 inch
Peak Flow Calculations
Is prelpost control of the 1 -yr, 24 -hr peak flow required?
n (Y or N)
1 -yr, 24 -hr runoff depth
in
1 -yr, 24 -hr intensity
m/hr
Pre - development 1 -yr, 24 -hr peak flow
ft' /sec
Post - development 1 -yr, 24 -hr peak flow
ft' /sec
PrelPost 1 -yr, 24 -hr peak control
ft' /sec
Storage Volume: Non -SA Waters
Minimum volume required
5,082 0 ft'
Volume provided
5,726 0 ft'
OK
Storage Volume: SA Waters
15' runoff volume
ft'
Pre - development 1 -yr, 24 -hr runoff
ft'
Post - development 1 -yr, 24 -hr runoff
ft'
Minimum volume required
0 ft'
Volume provided
ft'
Cell Dimensions
Ponding depth of water
12 inches
OK
Ponding depth of water
100 ft
Surface area of the top of the bioretention cell
5,726 0 ft'
OK
Length
11011
OK
Width
59 ft
OK
-or- Radius
ft
Media and Soils Summary
Drawdown time, ponded volume
6 hr
OK
Drawdown time, to 24 inches below surface
15 hr
OK
Drawdown time, total
21 hr
In -situ soil-
Soil permeability
4 00 in/hr
OK
Planting media soil.
Soil permeability
2 00 in/hr
OK
Soil composition
% Sand (by volume)
85%
OK
% Fines (by volume)
10%
OK
% Organic (by volume)
5%
OK
Total
100%
Fo SW 01 -8io t n o R v 8
Phgfipr�gls2x (�- �n�ez� o media
20 (unitless)
OK
Parts I and II Design Summary, Page 1 of 2

Basin Elevations
Temporary pool elevation
Type of bioretention cell (answer 'Y' to only one of the two
following questions)
Is this a grassed cell?
Is this a cell with trees /shrubs?
Planting elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
Permit Number
(to De provided by DWQ)
385 00 fmsl
y (Y or N) OK
n (Y or N)
384 fmsl
0 Inches Insufficient mulch depth, unless Installing grassed cell
3815 fmsl
2511
Oft
Are underdrams being Installed?
y (Y or N)
How many clean out pipes are being Installed?
6
OK
What factor of safety Is used for sizing the underdrams? (See
2
OK
BMP Manual Section 12 3 6)
Additional distance between the bottom of the planting media and
1 It
the bottom of the cell to account for underdrains
Bottom of the cell required
380 5 fmsl
SHWT elevation
378 5 fmsl
Distance from bottom to SHWT
2 ft
OK
Internal Water Storage Zone (IWS)
Does the design Include IWS
N (Y or N)
Elevation of the top of the upturned elbow
fmsl
Separation of IWS and Surface
384 ft
Planting Plan
Number of tree species
0
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the
y (Y or N)
OK
bioretention cell
Does volume in excess of the design volume flow evenly distributed
n (Y or N)
Excess volume must pass through filter
through a vegetated filter?
What Is the length of the vegetated filter?
ft
Does the design use a level spreader to evenly distribute flow?
n (Y or N)
Show how flow is evenly distributed
Is the BMP located at least 30 feet from surface waters (50 feet If
(Y or N)
OK
SA waters)
y
Is the BMP located at least 100 feet from water supply wells?
y (Y or N)
OK
Are the vegetated side slopes equal to or less than 3.1?
y (Y or N)
OK
Is the BMP located in a proposed drainage easement with access
(Y or N)
OK
to a public Right of Way (ROW)
y
Inlet velocity (from treatment system)
1 ft /sec:
OK
Is the area surrounding the cell likely to undergo development in
n (Y or N)
OK
the future)
Are the slopes draining to the bioretention cell greater than 20 %?
n (Y or N)
OK
Is the drainage area permanently stabilized?
y (Y or N)
OK
Pretreatment Used
(Indicate Type Used with an 'X" in the shaded cell)
Gravel and grass
(81inches gravel followed by 3-5 ft of grass)
Grassed Swale
OK
Forebay
x
Other
Form SW401- Bioretenton -Rev 8
June 25, 2010 Parts I and 11 Design Summary, Page 2 of 2

Bio Retention Design
10.8.2012
Project: Marquee Station Phase 3
BioRetention
la =
0.65
(Impervious fraction, urntless)
Rv =
064
(Runoff Coefficient, unitless)
Rd =
100
(Design storm depth, inches)
A =
240
(Watershed Area, Acres)
V =
5532.12
(WQv minimum, cf)
Bio Retention dimensions = variable
Area provided = 5726 00 sf
Volume provided @ 1.0' depth = 5726 00 cf
# of clean -outs required= 6
D = 792 ft (total underdrain pipe dia)
2 (# of 6" pipes required, Table 5 -1)

Watershed Model Schematic Hydraflow Hydrographs by Intehsolve v9 2

Hydrograph Return Period Recap HydraflowHydrographsbylntelisolvev92
Hyd.
No.
Hydrograph
type
(origin)
Inflow
Hyd(s)
Peak Outflow (cfs)
Hydrograph
description
1 -Yr
2 -Yr
3 -Yr
5 -Yr
10 -Yr
25 -Yr
50 -Yr
100 -Yr
1
2
Rational
Reservoir
1
8 825
0 000
—
—
1143
0 597
—
POND
bioretention
Proj. file blo retention A gpw
Monday, Oct 8, 2012

M
Hydrograph Summary Report HydraflowHydrographsbylntelisolvev92
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
peak
(min)
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(tuft)
Hydrograph
description
1
Rational
11.43
1
10
6,859
—
—
—
POND
2
Reservoir
0.597
1
19
372
1
38508
6,545
bioretention
bio retention A gpw
Return Period. 10 Year
Monday, Oct 8, 2012

Hydrograph Report '
Hydraflow Hydrographs by Intelisolve v9 2
Hyd. No. 2
Hyd. volume
bioretention
Max. Elevation
Hydrograph type
= Reservoir
Storm frequency
= 10 yrs
Time interval
= 1 min
Inflow hyd. No.
= 1 -POND
Reservoir name
= SYSTEM 1
Storage Indication method used Exhitration extracted from Outflow
Q (cfs)
1200
10.00
m
. IO
400
mm
bioretention
Hyd No. 2 — 10 Year
Monday, Oct 8, 2012
Peak discharge = 0.597 cfs
Time to peak
= 19 min
Hyd. volume
= 372 cuft
Max. Elevation
= 385.08 ft
Max. Storage
= 6,545 cuft
Q (cfs)
1200
1000
W
1111�1
4.00
2.00
0.00 a, 1 I V ' 000
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38
Time (min)
Hyd No 2 � Hyd No. 1 I I I 1 111 I, Total storage used = 6,545 cult

Channel Report
\"-rl ( - cWtArl 0 qS
Hydraflow Express Extension for AutoCADQD Civil 3130 2012 by Autodesk, Inc
<Name>
Circular
Diameter (ft) = 1.25
Invert Elev (ft)
Slope ( %)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
382 00
381.50
381.00
38050
38000
0
= 380.50
= 0.05
= 0.012
Known Q
= 0.60
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Section
Monday, Oct 8 2012
= 0.54
= 0.600
= 0.51
= 1.18
= 1.79 de � S
= 0.31
= 1.24
= 0.56
1 2 3
Reach (ft)

SITE ACREAGE:
23.53 ACRES
PIN NUMBER(S):
0677 -24 -9112, 0677 -34 -3487,
0677 -34 -1776
ZONING(S):
CDF II CU
4`
- -g
FEMA FIRM. MAP NUMBER(S):
3720067700
PLAT /DEED REFERENCES:
BM 2001, PG 902
DB 12610, PG 1828, PG 1825 & PG 1822
CURRENT LAND USE:
VACANT
ARQUEE STATION
j , 1 ,` ♦ ' A
F
w3

/
/
/
\
�
^�
�
\
\
/
/
/
/
/
oESPw
oa /
PIN 06
R
`
\
\
`
`
\
\
\
�
`
� \
Ca /
C,��
�
Vo /
ca� �
�
w /
/
'
'
/
/
/
________________
--_--__-� -_____-- _----'- -'-________'-___'_-_-_-____-____'_____'--_-_-_--_-___-__-'_______-__-_-___---_
_________-__------'-------------------------- ----- /
__-___--___ ---------------------------------------------------------------------------------------------------------------------
--------------------------------------------------- /'-------------------------------------------------------'---------------
| � _----'-----------�---�--
| /
| ' /
|
______
�
�
cA000n FAMILY LLc
\ oo 6797 po 573
`
`
\�
\
` `
�
'-- -- euVacnrL
�
/ cAoom/ FAwLrLLc `
IDEAL xvmznxENrpnv»
PIN 0677-03-42-83 2*
/
/
/
\
�
^�
�
\
\
/
/
/
/
/
oESPw
oa /
PIN 06
R
`
\
\
`
`
\
\
\
�
`
� \
Ca /
C,��
�
Vo /
ca� �
�
w /
/
'
'
/
/
/
________________
--_--__-� -_____-- _----'- -'-________'-___'_-_-_-____-____'_____'--_-_-_--_-___-__-'_______-__-_-___---_
_________-__------'-------------------------- ----- /
__-___--___ ---------------------------------------------------------------------------------------------------------------------
--------------------------------------------------- /'-------------------------------------------------------'---------------
| � _----'-----------�---�--
| /
| ' /
|
______
|
cA000n FAMILY LLc
\ oo 6797 po 573
~'~^^-~`-
'-- -- euVacnrL
\ ADCOCK, WATSON o
/ cAoom/ FAwLrLLc `
IDEAL xvmznxENrpnv»
PIN 0677-03-42-83 2*
| �ww ~ ~ W
' JAMES o
PC 1762
/
|
ccc
na 12643 PC 779
\ R30 ZONING
08 5231 PC 7 1 |
DB
PIN 0677-03-33-0829
/
R30 ZONING
nwmsm wn{INIx /
PIN 0677-03-3,322207
exo ZONING
| '
PIN 0677-03-23-7239
R,30 ZONING
/
/ LIT
/
PIN o
R30 ZONING
�
\
|
ann*owez� |
`
\
oe 9374 PC 76* .
wm
wm
m*
/
____-_-___ -_--
____--___----'------------------'--------- __-_-----� /'-
--__-'--____- '_--__--'--_-__-___----'_-_--__---_-____----________--_'___-_-_______---_----_____-_'_-'____ --_____-__--__----------_'----_--_---_-________--____ \--'__-
_---'__-_ _'----_-_________----_--________-'---_____-__---__-___--___'__'-___--_________-___-_-____-'___'
_________________________________________________________________________
7----'-----------'--------------
______
___.-----'-F
|
'
------------ T--'
|
\ ADCOCK, WATSON o
/ cAoom/ FAwLrLLc `
.
' \
|
|
oa&�u�c«
nwoa«�nm�»
0677-011 44
pwoa/o�p��/3J
PIN 0677-03-33-0829
R30 ZONING \
R30 ZONING
nwmsm wn{INIx /
nanZOwwa
\
|
x^wcsrn/owAs !
\
|
ann*owez� |
`
\
oe 9374 PC 76* .
/ \
|
PIN 0677-01-45-2636
CH ZONING |
\
/
|
BROADWELL, ALLEN v
oa 5982po545
nw 0677-03-4*-3432
nmu ZONING
a
FEET )
o
TINmENaROADWELL
|
rAmuYLLn
\
oo 8480 po /uxo
��T� �[� T/` �(` �T �
�w om,r-oo-**-*o**
n:n ZONING
FEET )
o

X
a
c
a
3
a
E
0
3
3
'v
u.
Z
O
K
w
_,,.
w"
J
m
N
W
3
5
i<

N
O
X
a
a
v
a
3
3
3
P
Z
O
CL
W
2 -
W
m
0
3
X
Kelm
- \ EXISTING CONTOURS
--a / FINAL CONTOURS
�.•/ PROPOSED STORM DRAIN PIPE
NOTE:
SHOWN RETAINING WALLS ON PLAN TO BE DESIGNED BY STRUCTURAL
INSPECTION ENGINEER AND APPROVED AS A SEPARATE PERMIT BY THE TOWN OF FUOUAY
VARINA • REOUIRED.
INLET PIPE _______
310- RETENTION AREA DETAIL
(NOT TO SCALE)
RIP RAP DISSAPATOR AND BERM
ELEV = 384.5'
BIORETENTION MINIMUM GRASS SURFACE
AREA = 5082 SF
MINIMUM STORAGE =5082 CF GRASSED SURFACE MUST BE SOD
HYBRID BERMUDA OR CENTIPEDE ELEV =
FOREBAY 384.0'
ELEV = 383.0'
DI TOP
ELEV = 385.00'
OF-7
,ELEV = 384.0'
+ +
+ t - + t + + + t
#57 STONE --
6" PERFORATED PIPE N5 GFAVEL
JACKET INV ELEV = 380.50'
CHOKING STONE ELEV = 381.5'
8� FRCP OUTLET PIPE Q EXTEND PIPE TO OF -8
INV ELEV = 379.24' V SHWT = 378.50'
BIORETENTION SOIL SPECIFICAT'ON:
SAt,DY LOAM (85 -88% SAND, 8 -12% FINES, 3 -59 ORGANIC)
P -INDEX = 10 -30
CONSTRUC770N SEQUENCING: UPON STABILIZATION OF ENTIRE SITE, SKiVMER BASIN TO BE MUCKED OUT AND CLEANED PRIOR TO INSTALLATION OF BIORETENTION UNDERDRAINS, SOIL MEDIA,
AND GRASSED TOP SURFACE.
Up Stream
+
+
+
+
+
Top Elevation
ZU
-.11
Stream Invert
+
+
+
+
Structure
Z�t�i1
(ft/ft)
(in)
(ft)
(ft)
Invert (ft)
+
+
+
+
+
CB -97
+
+
+
+
387.4
387.28
0.15
0.6
0.65
0.65
CB -97
0
+
+
+
390.9
+
386.77
0.2
0.6
0.87
1.52
+
t
+
15
98
+
+ t
386.28
.
0.6
0.69
0.69
It
CHOKING STONE ELEV = 381.5'
8� FRCP OUTLET PIPE Q EXTEND PIPE TO OF -8
INV ELEV = 379.24' V SHWT = 378.50'
BIORETENTION SOIL SPECIFICAT'ON:
SAt,DY LOAM (85 -88% SAND, 8 -12% FINES, 3 -59 ORGANIC)
P -INDEX = 10 -30
CONSTRUC770N SEQUENCING: UPON STABILIZATION OF ENTIRE SITE, SKiVMER BASIN TO BE MUCKED OUT AND CLEANED PRIOR TO INSTALLATION OF BIORETENTION UNDERDRAINS, SOIL MEDIA,
AND GRASSED TOP SURFACE.
Up Stream
Down Stream
Slope
Pipe Size
Length of RCP
Top Elevation
Up Stream
-.11
Stream Invert
Upstream Inlet
C factor
Local Flow
Total Flow
Structure
Structure
(ft/ft)
(in)
(ft)
(ft)
Invert (ft)
Area (acres)
(ftA3 /s)
({t,3 /s)
\
CB -96
CB -97
0.005
15
24
390.9
387.4
387.28
0.15
0.6
0.65
0.65
CB -97
DI -98
0.005
15
102
390.9
387.28
386.77
0.2
0.6
0.87
1.52
DI -98
DI -102
0.005
15
98
390
386.77
386.28
0.16
0.6
0.69
0.69
DI -99
DI -102
0.019
15
80
390.8
387.8
386.28
0.32
0.6
1.38
1.38
DI -100
DI -101
0.005
15
69
390.3
387.3
387
0.11
0.6
0.48
1.86
DI -101
D1 -102
0.005
15
73
390
387
386.28
0.13
0.6
0.56
4.63
DI -102
Di -105
0.0108
15
155
389.9
386.28
384.6
0.17
0.6
0.74
5.37
CB -103
CB -104
0.005
15
74
388.2
385.2
384.83
0.1
0.6
0.43
0.43
CB -104
D1 -105
0.005
15
54
388.4
384.83
384.6
0.19
0.6
0.82
115
DI -105
DI -106
0.005
18
64
387.5
384.6
384.3
0.75
0.6
3.25
9.87
DI -106
OF -7
0.005
18
53
387.5
384.3
384
0.13
0.6
0.56
10.44
DI -107
OF -8
0.005
18
48
385
379.5
379
2.41
0.6
0.29
10.44
FES 108
FES 109
0.015
36
78
N/A
3853
384.5
34
0.25
52.1
52.1
- -. ♦ •� - • -' Y • - lam
-
GRAPHIC SCALE
20 0 10 20 40 80
( IN FEET )
1 inch = 20 ft.