SW5120101_401 Certification Application_20120402

Permit Number; S �'v 201 ` Of
(to be provided by DWQ)
O�Of wAr�94G
ARA
� y
NCDENR p 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 (Pad 111) must be printed, filled out and submitted along with all of the required information,
I. PROJECT INFORMATION
Project name Camp Butner Cantonment Trailer Relocations
Contact name Eric Tweed, PE
Phone number 919-788-0224 j
Date April 3, 2013
Drainage area number 1
II, DESIGN INFORMATION
Site Characteristics
Drainage area
128,208 ft'
impervious area
66,856 ft7
Percent impervious
52.1% %
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is prelpost control of the 1-yr, 24-hr peak flow required?
y (Y or N)
1-yr, 24-hr runoff depth
7 in
1-yr, 24-hr intensity
3.53 inlhr=`�----
Pre-development 1-yr, 24-hr peak flow
7.130 ft3lsec
~
Post -development 1-yr, 24-hr peak flow
3.600 ft/sec
--�
Pre/Post 1-yr, 24-hr peak control
-3.530 ft3lsec
Storage Volume: Non -SA Waters
a
Minimum volume required
5,548.0 ft'
Volume provided
6,413.0 ft,
OK
a
Storage Volume: SA Waters
1.5" runoff volume
ft3
+ r
Pre -development 1-yr, 24-hr runoff
ft3
�.� .
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
0 ft3
Volume provided
ff3
Cell Dimensions
Ponding depth of water
9 inches
OK
Ponding depth of water
0.75 ft
Surface area of the top of the bioretention cell
9,283.0 ft'
OK
Length:
130 ft
OK
Width:
60 ft
OK
-or- Radius
ft
Media and Soils Summary
Drawdown time, ponded volume
7.5 hr
OK
Drawdown time, to 24 inches below surface
12 hr
OK
Drawdown time, total:
19.5 hr
In -situ soil:
Soil permeability
0.55 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%
Phosphorus Index (P-Index) of media
15 (unitless)
OK
Form SW401-9ioretention-Rev,B
June 25, 2010
Parts I and II. Design Summary, Page 1 of 2

4
Permit Number:
(to be provided by D WQ)
Basin Elevations
Temporary pool elevation
487.75 fmsi
Type of biorelention cell (answer 'Y' to only one of the two
following questions):
Is this a grassed cell?
y (Y or N) OK
Is this a cell with treesishrubs?
n (Y or N)
Planting elevation (top of the mulch or grass sod layer)
487 fmsi
Depth of mulch
0 inches Insufficient mulch depth, unless installing grassed cell.
Bottom of the planting media soil
485 fmsl
Planting media depth
2 ft
Depth of washed sand below planting media soil
0 ft
Are underdrains being installed?
y (Y or N)
How many clean out pipes are being installed?
10
OK
What factor of safety is used for sizing the underdrains? (See
3
OK
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
1 ft
the bottom of the cell to account for underdrains
Bottom of the cell required
484 fmsi
SHWT elevation
473 fmsi
Distance from bottom to SHWT
11 ft
OK
Internal Water Storage Zone (IWS)
Does the design include IWS
y (Y or N)
Elevation of the top of the upturned elbow
484.75 fmsi
Separation of IWS and Surface
2.25 ft
OK
Planting Plan
Number of tree species
0
Number of shrub species
0
Number of herbaceous groundcover species
1
Recommend more 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
y (Y or N)
OK
through a vegetated filter?
What is the length of the vegetated filter?
0 It
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 (Y or N)
OK
SA waters)?
Is the BMP localed 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 (Y or N)
OK
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
0.5 fusec
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 bloretention 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
(flinches gravel followed by 3-5 ft of grass)
n
Grassed swale
y
Forebay
y
Other
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and It. Design Summary, Page 2 of 2

Permit Number; S �'v 201 ` Of
(to be provided by DWQ)
O�Of wAr�94G
ARA
� y
NCDENR p 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 (Pad 111) must be printed, filled out and submitted along with all of the required information,
I. PROJECT INFORMATION
Project name Camp Butner Cantonment Trailer Relocations
Contact name Eric Tweed, PE
Phone number 919-788-0224 j
Date April 3, 2013
Drainage area number 1
II, DESIGN INFORMATION
Site Characteristics
Drainage area
128,208 ft'
impervious area
66,856 ft7
Percent impervious
52.1% %
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is prelpost control of the 1-yr, 24-hr peak flow required?
y (Y or N)
1-yr, 24-hr runoff depth
7 in
1-yr, 24-hr intensity
3.53 inlhr=`�----
Pre-development 1-yr, 24-hr peak flow
7.130 ft3lsec
~
Post -development 1-yr, 24-hr peak flow
3.600 ft/sec
--�
Pre/Post 1-yr, 24-hr peak control
-3.530 ft3lsec
Storage Volume: Non -SA Waters
a
Minimum volume required
5,548.0 ft'
Volume provided
6,413.0 ft,
OK
a
Storage Volume: SA Waters
1.5" runoff volume
ft3
+ r
Pre -development 1-yr, 24-hr runoff
ft3
�.� .
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
0 ft3
Volume provided
ff3
Cell Dimensions
Ponding depth of water
9 inches
OK
Ponding depth of water
0.75 ft
Surface area of the top of the bioretention cell
9,283.0 ft'
OK
Length:
130 ft
OK
Width:
60 ft
OK
-or- Radius
ft
Media and Soils Summary
Drawdown time, ponded volume
7.5 hr
OK
Drawdown time, to 24 inches below surface
12 hr
OK
Drawdown time, total:
19.5 hr
In -situ soil:
Soil permeability
0.55 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%
Phosphorus Index (P-Index) of media
15 (unitless)
OK
Form SW401-9ioretention-Rev,B
June 25, 2010
Parts I and II. Design Summary, Page 1 of 2

4
Permit Number:
(to be provided by D WQ)
Basin Elevations
Temporary pool elevation
487.75 fmsi
Type of biorelention cell (answer 'Y' to only one of the two
following questions):
Is this a grassed cell?
y (Y or N) OK
Is this a cell with treesishrubs?
n (Y or N)
Planting elevation (top of the mulch or grass sod layer)
487 fmsi
Depth of mulch
0 inches Insufficient mulch depth, unless installing grassed cell.
Bottom of the planting media soil
485 fmsl
Planting media depth
2 ft
Depth of washed sand below planting media soil
0 ft
Are underdrains being installed?
y (Y or N)
How many clean out pipes are being installed?
10
OK
What factor of safety is used for sizing the underdrains? (See
3
OK
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
1 ft
the bottom of the cell to account for underdrains
Bottom of the cell required
484 fmsi
SHWT elevation
473 fmsi
Distance from bottom to SHWT
11 ft
OK
Internal Water Storage Zone (IWS)
Does the design include IWS
y (Y or N)
Elevation of the top of the upturned elbow
484.75 fmsi
Separation of IWS and Surface
2.25 ft
OK
Planting Plan
Number of tree species
0
Number of shrub species
0
Number of herbaceous groundcover species
1
Recommend more 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
y (Y or N)
OK
through a vegetated filter?
What is the length of the vegetated filter?
0 It
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 (Y or N)
OK
SA waters)?
Is the BMP localed 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 (Y or N)
OK
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
0.5 fusec
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 bloretention 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
(flinches gravel followed by 3-5 ft of grass)
n
Grassed swale
y
Forebay
y
Other
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and It. Design Summary, Page 2 of 2

r
! + .SLV-S7Z4ID j
O n n n Permit Number:
(to be provided by DW4)
oaDF W A L�R
FEB - 6 2012 � iQ6E,
HCDENR T
DENR - WATER QUALITY
STORMWAITERifMMAG.EMEOTRERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required items Checklist (Part tit) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name Camp Butner Cantonment Trailer Relocations
Contact name Eric Tweed, PE
Phone number 919-788-0224
Date February 3, 2012
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area
128,208 It2
Impervious area
66,856 ft 2
Percent impervious
52.1% %
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is pre/post control of the 1-yr, 24-hr peak flow required?
y (Y or N)
1-yr, 24-hr runoff depth
7 in
1-yr, 24-hr intensity
3.53 inihr
Pre -development 1-yr,.24-hr peak flow
7.130 ff'lsec
Post -development 1-yr, 24-hr peak flow
3.600 ft'/sec
PrelPost 1-yr, 24-hr peak control
-3.530 ft'/sec
Storage Volume: Nan -SA Waters
Minimum volume required
5,548.0 It
Volume provided
6,413.0 ft3
OK
Storage Volume: SA Waters
1.5' runoff volume
ff3
Pre -development 1-yr, 24-hr runoff
ft3
Post -development 1-yr, 24-hr runoff
It
Minimum volume required
0 ft3
Volume provided
ft3
Cell Dimensions
Pending depth of water
9 inches
OK
Ponding depth of water
0.75 ft
Surface area of the top of the bioretention cell
9,283.0 ft2
OK
Length:
130 ft
OK
Width:
60 ft
OK
-or- Radius
ft
Media and Soils Summary
Drawdown time, pondod volume
6 hr
OK
Drawdown time, to 24 inches below surface
24 hr
OK
Drawdown time, total:
30 hr
in -situ soil.
Soil permeability
0.55 in/hr
OK
Planting media soil:
Soil permeability
1.50 in/hr
OK
Sol composition
% Sand (by volume)
85%
OK
% Fines (by volume)
10%
OK
% Organic (by volume)
5%
OK
Total: 100%
Phosphorus Index (P-Index) of media
15 (unitless)
OK
Form SW401-Biaretention-Rev.8
June 25, 2010 Parts I and II. Design Summary, Page 1 of 2

Permit Number:
(10 be provided by DWO)
Basin Elevations
Temporary pool elevation
487.75 fmsi
Type of bioretention cell (answer'Y' to only one of the two
foliovring questions):
Is this a grassed cell?
y (Y or N) OK
Is this a cell with trees/shrubs?
n C7 or N)
Planting elevation (top of the mulch or grass sod layer)
487 fmsl
Depth of mulch
0 inches Insufficient mulch depth, unless installing grassed cell.
Bottom of the planting media soil
485 fms4
Planting media depth
2 it
Depth of washed sand below planting media soil
Q It
Are underdrains being installed?
y (Y or N)
How many clean out pipes are being installed?
.10
OK
What factor of safely is used for sizing the underdrains? (See
3
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
484 fmsi
SHWT elevation
473 fmsi
Distance from bottom to SHWT
11 It
OK
Internal Water Storage Zone (IWS)
Does the design include IWS
y - (Y or N)
Elevation of the top of the upturned elbow
484.75 fmsl
Separation of IWS and Surface
2.25 It
OK
Planting Plan
Number of tree species
0
Number of shrub species
0
Number of herbaceous groundcover species
1
Recommend more 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
y (Y or N)
OK
through a vegetated filter?
What Is the length of the vegetated filter?
0 it
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 feel it
y (Y or N)
OK
SA waters)?
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 or N)
OK
Is the BMP located in a proposed drainage easement with access
y (Y or N)
OK
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
0.5 fVsec
OK
Is the area surrounding the cell likely to undergo development to
n (Y or N)
OK
the future?
Are the slopes draining to the bioretention cell greater than 20%7
n (Y or N)
OK
Is the drainage area permanently slabitized?
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 It of grass)
n
Grassed Swale
y
Forebay
Other
Farm SW401-e10retention-Rev.8
June 25, 200 Parts I and 11, Design summary, Page 2 of 2

.;
Permit Number: _5k4P2_0 J 01
fro be provided by DWQ)
O�O� VV ATFAQ
.==*A,
NCDENR p Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This Form must he filled out, printed and submitted.
rho Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
PROIECTONFQRMATION ..i
Project name Camp Butner Cantonment Trailer Relocations
Conlacl name Eric Tweed, Pr;:
Phone number 919.788-0224.�::.:.`:
Date February 6, 2012
Drainage area number 2 (North) .......
If jR SIGKINFORMATION —h.., .'..YI'%S9i. .f-•. ,,f .J_t."w.l,� r> e3 ,.. w a !l, Ye,...U.� �-1 r.5:31X:f4 'P. >s4{.$bn Y��-F.�v
Site Characteristics
Drainage area
176,272 III
ImperviousImper
Percent im vious
76,057 %
43.1°h
PD
Design rainfall depth
1.0 Inch
Peak Flow Calculations
FEB _ 6 2012
Is prelpost control of the 1-yr, 24-hr peak flow required?
y (Y or N)
1-yr, 24-hr runoff depth
7,2 In
DENR-WATER QUALITY
1-yr, 24-hr intensity
4.3 €Nhr
1NETLANDSAND ST0RMWATER BRANCH
Pre -development 1-yr, 24-hr peak flow
4.300 ft'isec
Post-devolopmenl 1-yr, 24-fir peak flow
2.330 ft3lsec
PfelPost 1-yr, 24-hr peak control
-1.970 ft'Isec
Storage Volume: Non•SA Waters
Minimum volume required
::. 6,439.0 It'
Volume provided
7,042.0 i13
OK
Storage Volume: SA Waters
1.9 runoff volume
fl'
Pre -development 1-yr, 24-hr runoff
ff
Post -development 1-yr. 24-hr runoff
ft'
Minimum volume required
0 It,
Volumo provided
It'
Coll Dimensions
Ponding depth of water
9.6 inches
OK
Pond'tng depth of water
0.80 ft
Surface area of the top of the biorelenlion cell
9,523.0 le
OK
Length:
180It
OK
Width:
55 it
OK
-or- Radius
It
Medla and Solis Summary
Drawdown time, ponded volume
8 hr
OK
Drawdown time, to 24 inches below surface
24 hr
OK
Drawdown time, total:
32 hr
In -situ soil:
Soil permeablhly
0,551M1r
OK
Planting media soil:
Soil permeability
1.50 €o tr
OK
Soil composition
% Sand (by volume)
85%
OK
% Fines (by volume)
10%
OK
% Organic (by volume)
5%
OK
Total:
100%
Phosphorus index (P Index) of media
15 (unilless)
OK
Form SW401-131oretenlion-Rev.8
June 25, 2010
Pads I and it. Design Summary, Page 1 of 2

Permit Numbw:
(to be provided by DWQ)
Basin Elevations
Temporary pool elevation
477.60 fmsl
Type of btoretenlion cell (answer "Y' to only one of the two
following questions):
Is this a grassed cell?_
(Y or N)
OK
Is this a cell with lreWshrubs?
n (Y or N)
Planting elevation (top of the mulch or grass sod layer)
476.8 fmsl
Depth of mulch
1 0 Inches
Insufficient mulch depth, unless installing grassed cell.
Bottom of the planting media soil
474.8 fmsl
Planting media depth
2 ft
Depth of washed sand below ptanl{ng media sail
-Oft
Are underdrains being installed?
:y (Y or N)
How many dean out pipes are being installed?
10
OK
What factor of safety is used for sizing the underdrains? (See
3
OK
BMP Manual Section 12,3.6)
Additional dislanco between the bottom of the planting media and
1 it
the bottom of the cell to account for underdrains
Bottom of the cell required
473.8 fmsl
SHVY7 elevation
464.3 fmsl
Distance from bottom to SHWT
9.6 ft
OK
Internal Water Storage Zone (IWS)
Does the design include IWS
y
: (Y or N)
Elevation of the top of the upturned elbow
474.75 fmsl
Separation of IWS and Surface
2.05 ft
OK
Planting Plan
Number of tree species
0
Number of shrub species
0
Number of herbaceous groundcover species
Z
Recommend more species.
Additional Information
Dees volume in excess of the design volume bypass the
y
.; : (Y or N)
OK
bioretention cell?
, ,
Does volume in excess of the design volume Row evenly distributed
Y
" (Y or N}
OK
through a vegetated filter?
What Is the length of the vegetated filter?
a0 ft
Does the design use a towel spreader Io evenly distribute flow?
y
.`: (Y or N)
Submit a level spreader supplement.
Is the BMP located at least 30 feet from surface waters (50 feet if
y
(y or N)
OK
SA waters)?
Is the BMP located at least 100 feet from water supply wells?
y
L (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)?
Inlet velocity (from Ireatment system)
0.49 fYsec
OK
Is the area surrounding the cell likely to undergo development in
(Y or N)
OK
the future?
Are the slopes draining to the bloretontion cell greater than 20%?
n
(Y or N)
OK
Is Iho drainage area permanently stabilized?
Y (Y or N)
OK
Pretreatment Used
(Indicate Type Used with an'X' in the shaded cell)
Gravel and grass
(B1nches gravel followed by 3.5 ft of grass)
n
Grassed swa!e
Y
Forebay
y
Other
Form SW401-81oretention-Rev.8
June 25, 2010 Parts I and 11, Qeslgn Summary, Page 2 of 2

_W-571 ZOto
e o`�o� wATF�pr
� r
NCDENR p
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
I. PROJECT INFORMATION „
Project name Camp Butner Cantonment Trailer Relocation
Contact name Eric Tweed, PE
Phone number 919-788-0224
Date January 26, 2012
Drainage area number 2
II. DESIGN INFORMATION
The purpose of the LS-VFS PoUtant removal: 40% TSS, 30% TN, 35% TP
Stormwater enters LS-VFS from A BMP
Type of VFS Engineered filter strip (graded & sodded, slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS•VFS from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 inlhr storm
Time of concentration
Rainfall intensity, 10-yrstorm
Peak flow from the 10-yr storm
Design storm
Maximum amount of flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peak discharge from the BMP during the 10-year storm
Maximum capacity of a 100-foot long LS-VFS
Peak flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Length of level tip provided
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
ftz
Do not complete this section of the form.
ft2
Do not complete this section of the form.
%
Do not complete this section of the form.
Do not complete this section of the form.
cfs
Do not complete this section of the form.
min
Do not complete this section of the form.
inlhr
Do not complete this section of the form
cfs
Do not complete this section of the form.
cfs
Do not complete this section of the form.
(Y or N)
Do not complete this section of the form.
Other; Explained below
0,47 cfs
2 cfs
10 cfs
2 cfs
y (YorN)
Bioretention Basin 2
50
sq ft No forebay is required
9
in
9
in Depth is appropriate.
10
ft/cfs
20
ft
40
it
30
ft
472.75
fmsf
470.90
fmsl
Form SW401 - LS-VFS - 27Ju12011 - Rev.9 page 1 of 3

N
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
6.17 %
n (Y or N) OK
ri (Y or N)
Y" (Y or N)
y (Y or N) Please provide plan details of flow splitter 8 supporting talcs.
4,00
ft
5.50 '
ft
16.00
ft
0.20
ft
1.30
ft
0.40
fUsec
Pick one:
W
n_.. (Y or N)
y . (Y or N)
n
i a i
III. REQUIRED ITEMS CHECKLIST
EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the
following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been
met, attach justification.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build -out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
High flow bypass system,
One foot topa lines between the level lip and top of stream bank,
Proposed drainage easement, and
Design at ultimate build -out.
Initials
Form SW441 - LS-VFS - 27Jul2a11 - Rev.9 page 2 of 3

Permit dumber.
(to be provided by DWQ)
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
Are underdrains being installed?
487.75 fmsl
y� (Y or N)
n (Y or N)
487 fmsl
0 inches
485 fmsl
2 ft
0 ft
y (Y or N)
How many clean out pipes are being installed?
10
What factor of safety is used for sizing the underdrains? (See
3
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
1 ft
the bottom of the cell to account for underdrains
Bottom of the cell required
484 fmsl
SHWT elevation
473 fmsl
Distance from bottom to SHWT
11 ft
Internal Water Storage Zone (IWS)
Does the design include IWS
y (Y or N)
Elevation of the top of the upturned elbow
484.75 fmsl
Separation of IWS and Surface
2.25 ft
Planting Plan
Number of tree species
0
Number of shrub species
0
Number of herbaceous groundcover species
1
Additional Information
Does volume in excess of the design volume bypass the
y (Y or N)
bioretention cell?
Does volume in excess of the design volume flow evenly distributed
y (Y or N)
through a vegetated filter?
What is the length of the vegetated filter?
0 ft
Does the design use a level spreader to evenly distribute flow?
n (Y or N)
Is the BMP located at least 30 feet from surface waters (50 feet if
y (Y or N)
SA waters)?
is the BM localed at least 100 feet from water supply wells?
y (Y or N)
Are the vegetated side slopes equal to or less than 11?
y (Y or N)
Is the BMP located in a proposed drainage easement with access
y (Y or N)
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
0.5 fUsec
is the area surrounding the cell likely to undergo development in
n (Y or N)
the future?
Are the slopes draining to the bioretention cell greater than 20%?
n (Y or N)
Is the drainage area permanently stabilized?
y (Y or N)
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
n
(flinches gravel followed by 3-5 ft of grass)
Grassed Swale
y
Forebay
- y
Other
M
Insufficient mulch depth, unless installing grassed cell.
OK
OK
OK
OK
Recommend more species.
OK
OK
Show how flow is evenly distributed.
OK
OK
OK
OK
OK
OK
OK
OK
Form SW401-Bioretention-Rev.8
June 25, 2010
Parts I and II. Design Summary, Page 2 of 2

3. Section view of the level spreader (1' = 20' or larger) showing: C2
- Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downstope filter fabric.
4. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from � C1
sediment until the entire drainage area is stabilized. I
6. If a non -engineered VFS is being used, then provide a photograph of the VFS showing NA
that no draws are present
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
Form SW401 - LS-VFS - 27NI2011 - Rev.9 page 3 of 3