SW6101104_401 Certification Application_20121221

Permit No.
Ito be provided by DWQ)
®yy or0, WATego
&*0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM o7
NCDENR 401 CERTIFICATION APPLICATION FORM
DRY EXTENDED DETENTION BASIN 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 the required information.
I.':,,,PROJECTiINFORMATION '4 `r&'v'F1 kS:+"r
Project name TUAS Support Facility at Fat Bragg
Contact person Nick Rightmyer
Phone number 252-519.2135
Date 802010
Drainage area number 1 «2 (Bio Pond overflow discharges into this pond)
II.'SDESIGN''INFORMATIONF..f.'�5,..�.:i`'�.y,4es_`,:ar+.,,- .v"'Sv ._a:x.rq`7 ��4.:�`"ia;"*3 °'?»P.�s;a
Site Characteristics
Drainage area
139,291.00
ft' (t2"1, 1154- t 2, 016)
Impervious area
66,422.00
ft3(4afa 2.1b
Impervious
0.48
Design rainfall depth
1.00
in
Peak Flow Calculations
1-yr, 24-hr rainfall depth
3.11
in
Rational C, pre -development
0.30
(unitless)
Rational C, post -development
0.60
(unitless)
Rainfall intensity: 1-yr, 24-hr storm
0.13
inmr
Predevelopment 1-yr, 24-hr peak flow
0.12
ft'Isec
Post -development 1-yr, 24-hr peak flow
0.24
ft'lsec
Pre/Post 1-yr, 24-hr peak control
0.12
ft'/sec
Storage Volume: Non -SA Waters
Minimum required volume
Provided volume
14,357.00
18,825,00
fl' \
ft' OK ( t 3, 2 ZZ-}5lrb3)
Sediment storage volume provided
N
ry3 OK
Storage Volume: SA Waters
1.5' runoff volume
rya
Pre -development 1-yr, 24-hr runoff volume
It
Post -development 1-yr, 24-hr runoff volume
ft3
Minimum required volume
If
Provided volume
rya
Sediment storage volume provided
rya
Basin Design Parameters
Drawdown time
3,00
days OK
SHWT elevation
first
Basin bottom elevation
229.00
fmsl OK
Storage elevation
228.50
fmsl
Basin side slopes
3.0
:1 OK .
Top elevation
234.00
fist OK
Freeboard provided
1.00
it OK
Basin Bottom Dimensions
Basin length
115.00
it
Basin width
15.00
It
Length to width ratio
8.00
:1 OK
Form SW401-Dry &tended Detention Basin-Rev.3 Parts 1.811, Design Summary, Page 1 of 2

Permit
(to be provided by DWQ)
Additional Information
Total runoff volume captured by basin
Forebay provided
Is basin in a recorded drainage easement?
Does basin capture all runoff at ultimate build -out?
Is a sediment depth indicator included?
Does the basin include a drain?
ac-in
N
(Y or N)
Y
(Y or N) OK
Y
(Y or N) OK
Y
(Y or N) OK
Y
(Y or N) OK
Form SVJ401-Dry Extended Detention Basin-Rev.3 Pans I. & II. Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
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.lf a
requirement has not been met, attach justification.
Pagel Plan
Initials
Sheet No.
C I.'A
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),
- Basin dimensions,
- Pretreatment system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
C 1 JA
2. Plan details (V = 30' or larger) for the bioretention cell showing:
- Basin dimensions
- Pretreatment system,
- Maintenance access,
- Outlet structure,
- Overflow device,
- Flow distribution detail for basin inflow, and
- Vegetation specifications.
No7
5 How 0
3. Section view of the basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
Q�
C )• S
6. A construction sequence that shows how the dry detention basin will be protected from sediment until the
entire drainage area is stabilized.
++.
T The supporting calculations.
/�) 4 •
8. A copy of the signed and notarized operation and maintenance (O&M) agreement.
Y� A
9. A copy of the deed restrictions (if required).
�n
A i4 •
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Dry Extended Detention Basin-Rev.3 Part III. Required Items Checklist, Page i of 1

Lgin
NCDENR
urd be provided by DM)
Of WATflO
m �
o
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 fll) must be printed, filled out and submitted along with all of the required information.
Project name TUAS Support Facility at Fort Bragg
Contact name - Nick Rightmyer
Phone number 252-519-2135
Date August2,2010
Drainage area number 1,.
II.DESIGNINFORMATION tZ1'::s;av "�'1;,^'
.;P"'r`M`'..:;`. �,`.r �, c^.,.•:,;^;4%I.ar�€'"°,�.cF'.r`z'"'st>i?, r
Site Characteristics
Drainage area
127,195 It'
Impervious area
66,216 ft'
Percent impervious
52.1% %
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is preipost control of the 1-yr, 24-hr peak flow required?
- N (Y or N)
1-yr, 24-hr runoff depth
3.11 in
1-yr, 24-hr intensity
0.13 inmr
Pre -development 1-yr, 24-hr peak flow
-0.120 tt'Isec
Post -development 1-yr, 24-hr peak flow
0.240 ft'Isec
Pre/Post 1-yr, 24-hr peak control
0.120 ft'Isec
Storage Volume: Non -SA Waters
-
Minimum volume required
--5,496.0 Ili
Volume provided
5.603.0 it'
OK
Storage Volume: SA Waters
1.5' runoff volume
If
Pre -development 1-yr, 24-hr runoff
- ff'
Post -development 1-yr, 24-hr runoff
W
Minimum volume required
0 ft3
Volume provided
It'
Cell Dimensions
Fording depth of water
12 inches
OK
Pending depth of water
1.00 it
Surface area of the top of the bioretention cell
6,394.0 ft'
OK
Length:
170 ff
OK
Width:
30 It
OK
-or- Radius
It
Media and Soils Summary
Drawdown time, pendent volume
hr
Drawdown time, to 24 inches below surface
m
Drawdown time, total:
0 hr
In -situ soil:
Soil permeability
10.00 in/hr
OK
Planting media soil..
Soil permeability
2.00 inmr
OK
Soil composition
%Sand (by volume)
86%
OK
% Fines (by volume)
10%
OK
Form SW401-eioretention-Rev.8
June 25, 2010
Pads I and II. Design Summary. Page 1 of 3

ms consultants, Inc.
engineers, architects, planners
336 B Carthage Street
Sanford, NC 27330
[phone]
FAX: [phone]
www.msconsultants.com
DRY DETENTION POND CALCULATIONS
Runoff Volume using Simple Method (Section 3.3)
Rainfall Depth
Drainage Area =
139291 SF
Drainage Area =
3.20 Ac
Impervious Area =
66422 SF
Impervious Fraction (IA) =
0.48
Runoff Coefficient (Rv) =
0.48
Rainfall Depth to control =
1 "
Volume =
5562.029 cf
Pre/Post Development Differece
lyr 24 hr Rainfall Depth =
3.11 "
Predev Drainage Area =
139291 sf
Predev Impervious Area =
4870
Impervious Fraction =
0,034963
Predev Rv =
0.081466
Volume =
14357 cf
Project Name :
TUAS
Project Number:
64-1281U ..
Project Location :
Fort Bragg, NC
Designed by:
NSR
Date :
2-Aug-10
= Drainage Area / Impervious Area
=0.05+(0.9'IA)
= 3630' Depth' Rv' Area
= Drainage Area / Impervious Area
=0.05+(0.9`IA)
= 3630 ' Depth ` ( Rv post -.Rv pre) ' Area

Permit
(to be provided by DWQ)
% Organic (by volume)
Phosphorus Index (P-Index) of media
4% OK
Total: 100%
20 (unitless) OK
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and II. Design Summary, Page 2 of 3

Permit Number:
fro be provided by DWq)
Basin Elevations
Temporary pool elevation
232.00 fmsl
Type of bioretention cell (answer 'Y" to only one of the two following
questions):
Is this a grassed cell?
(Y or N)
Is this a cell with trees/shrubs?
y (Y or N) OK media depth
Planting elevation (top of the mulch or grass sod layer)
231 fmsl
Depth of mulch
4 inches OK
Bottom of the planting media soil
228 fmsl
Planting media depth
3 ft
Depth of washed sand below planting media soil
0 it
Are underdrains being installed?
N (Y or N)
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
0 ft
the bottom of the cell to account for underdrains
Bottom of the cell required
228 fmsl
SHWT elevation
fmsl
Distance from bottom to SHWT
228 it . 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 231 ft
Planting Plan
Number of tree species 1
Number of shrub species 3
Number of herbaceous groundcover species 3 OK
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 or N) Excess volume must pass through filler.
through a vegetated filter?
What is the length of the vegetated filled? 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
(Y or N)
OK
SA waters)?
Is the BMP located at least 100 feel from water supply wells?
Y
(Y or N)
OK
Are the vegetated side slopes equal to or less than TV
Y
(Y or N)
OK
Is the BMP located in a proposed drainage easement with access to
Y
(Y or N)
OK
a public Right of Way (ROW)?
Inlet velocity (from treatment system)
ft/sec
Is the area surrounding the cell likely to undergo development in the
N
(Y or N)
OK
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
X
OK
Forebay
Other
Form SW401-Bioretention-Rev.8
June 25, 2010 Parts I and 11. Design Summary, Page 3 of 3

Permit No:
(to be assigned by DWQ)
III. REQUIRED ITEMS CHECKLIST
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.
Pagel Plan
Initials Sheet No.
C 1.4 1. Plans IV - 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),
- Cell dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROM,
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
C- t't,1 2. Plan details (1" = 30' or larger) for the bioretention cell showing:
- Cell dimensions
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
- Indicate the P-Index between 10 and 30
C II-18 3. Section view of the bioretention cell (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower
- Underdrain system (if applicable), and
- Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
(A+il rljed SHWT level(s), and overflow structure]
4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWO, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
- Soil permeability,
- Soil composition (%sand, %fines, %organic), and
C jig
- P-index.
5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
- A variety of suitable species,
- Sizes, spacing and locations of plantings,
- Total quantity of each type of plant specified,
- A planting detail,
- The source nursery for the plants, and
- Fertilizer and watering requirements to establish vegetation.
C 1' 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
n ' ' entire drainage area is stabilized.
1r4+ 7. The supporting calculations (including underdrain calculations, if applicable).
'2'.ZL `>`', S. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
<24 a 9. A copy of the deed restriction.
Form SW401-Bioretention-Rev.7 Part III, Page 1 of 1

so

DRAINAGE AREA 1
TO BIORETENTION
DA = 127195 SF
DRAINAGE AREA 3
FLOWS OFFSITE
\DA = 17680 SF
DRAINAGE AREA 2
TO DRY POND
DA = 12096 SF
9 POST -DEVELOPMENT D.A.M.
DRAINAGE AREA 4
FLOWS OFFSITE
DA = 128879 SF
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