2222_001

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
Stormwater runoff will be VilZtd throw h a ro osed storm pipe collections stem to an infiltration basin on
the project site.
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
❑ Approval of a Site Specific Development Plan or PUD Approval Date:
[] Valid Building Permit Issued Date:
❑ Other: Date:
b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
❑ Coastal SW -1995 ❑ Ph II - Post Construction
3. Storm w this project drains to the Cape Fear River basin.
otal Property Area: 6.65 acres 5. Total Coastal Wetlands Area: 0.00 acres
6. Total Surface Water Area: 0 acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project
Area+:6.65 acres
+ Total project area shrill be calculated to exclude the fralloxving: the normal pool of inipFounded structures, the area
between the banks of stretams and rivers, the area below the Normal Hi h Water (NHW) line orMean High Water
(MHW) line, and coastal wetlands landward from the NHW (or MHA) line. The resultant project area is used to
calettlate oz)erall percent lit+ilt ttlxotr area (BUA). Nair -coastal zt etlartds larrdzotn'd of the N TW (or MHm lir:e niait
be included in the total project area. 4�4#
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 50.4 al '/
s
9. How many drainage areas does the project have?1 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole properly/ area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Basin Information Drainage Area 1 Drainage Area _ Drainage Area _
Drainage Area _
Receiving Stream Name Beaver Creek
32,931
Stream Class * C
Stream Index Number * 18-31-24-5-1
109,535
Total Drainage Area (so 269,619 10"' •
3,706
On-site Drainage Area (sf) 269,619
Off-site Drainage Area (sf)
Proposed Impervious Area** (so 146,172
% Impervious Area** total 54.20
Impervious' Surface Area
Drainage Area 1 1 Drainage Area _ Drainage Area _ Drainage Area _
On-site Buildings/Lots (so
32,931
On-site Streets (sf)
On-site Parking (sf)
109,535
On-site Sidewalks (so
3,706
Other on-site (so
Future (sf)
Off-site (sf)
Existing BUA*** (so
Total (sf):
146,172
* Stream Class and Index Number can be determined at: ]ty�(lre�rfal,nccleatr.nr� iHb/zurl/7s/csn/rlassrficatiort
Inzpervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 06Aug2012 Page 3 of 6

INFILTRATION BASIN STORAGE CALCULATIONS
PROJECT: DATE PREPARED:
SMOKE BOMB HILL REDEVELOPMENT 6/4/2014 REV. 3/30/15
DESCRIPTION: PREPARED FOR:
INFILTRATION BASIN CALCULATIONS FORT BRAGG DPW-WMB
ENGINEER: & PREPARED BY: REVIEWED BY:
N iV1viC7t.l EM JBS CN
PROJECT NO. 6048-0003
Design Volume
Drainage Area
6.19
ACRE
Value from CAD
Impervious Drainage Area
3.35
ACRE
Value from CAD
Impervious Cover
54.2%
SF
Impervious Cover --(Impervious Drainage
Bypass Elevation
271.00
FMSL
Area)/(Total Drainage Area) 100/
Runoff Coefficient, Rv
0.538
IN/IN
Rv=0.05+0.009'(% Impervious)
Total Required Design Volume
21,752
CF
1.8)"Runoff Volume= 1,Binch'Rv"1 foot/12
Top of Dam Elevation
275.00
FMSL
inch"(Total Drainage Area)
Infiltration Basin Information
SHWT
265.40
FMSL
Value from S&ME Testing
Bottom Elevation
267.50
FMSL
Elevation of the bottom of the basin
Bottom SA
3,212
SF
Surface area at the bottom of the basin
Bypass Elevation
271.00
FMSL
Temporary pool elevation
Bypass SA
7,993
SF
Surface area at the temporary pool
Provided Storage Volume
22,484
CF
See Hydraflow Results
Top of Dam Elevation
275.00
FMSL
Infiltration Rate
1.71
IN/HR
Value from S&ME Testing Report
Drawdown Time
4.5
DAYS
See Drawdown Spreadsheet
McKim Creed, Inc.
243 N Front Street
Wilmington, North Carolina 28401
[phone]
1 of 1

Permit No
(to be provided by DWQ)
f W +5 YQ9
A�-*�
/�
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
a
NCDENR 401 CERTIFICATION APPLICATION FORM
INFILTRATION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) most be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATiON
Project Name Smoke Bomb Hill AAFES Mini -Mall Express
Contact Person Branch Smith I McKim & Creed
Phone Number 910-343-1048
Date 30 -Mar -2015
Drainage Area Number DA -1
II. DESIGN INFORMATION
days OK
4.00
Site Characteristics
267.50
i
Drainage area
269,619.00
•
ft2
Impervious area
146,172.00
ft2
3.
Percent impervious
54.21
%
Design rainfall depth
1.80
in
Peak Flow Calculations
1 -yr, 24 -hr rainfall depth
NA
in
1 -yr, 24 -hr intensity
in/hr
Pre -development 1 -yr, 24 -hr discharge
ft3/sec
Post-development 1 -yr, 24 -hr discharge
ft3/sec
Pre/Post 1 -yr, 24 -hr peak flow control
ft/sec
Storage Volume: Non -SA Waters
Minimum design volume required
Design volume provided
Storage Volume: SA Waters
1.5' runoff volume
Pre -development 1 -yr, 24 -hr runoff volume
Post -development 1 -yr, 24 -hr runoff volume
Minimum required volume
Volume provided
Soils Report Summary
Soil type
Infiltration rate
SHWT elevation
Basin Design Parameters
Drawdown time
Basin side slopes
Basin bottom elevation
Storage elevation
Storage Surface Area
Top elevation
Basin Bottom Dimensions
Basin length
Basin width
Bottom Surface Area
E
ft3ft3 OK for non -SA waters
N/A ft3
ft3
ft3
ft3
—ft3
Lakeland Sand
1.70 in/hr
265.40 fmsl
4.50
days OK
4.00
:1 OK
267.50
fmsl OK
270.93
fmsl
7,993.00
ft2
275.50
fmsl
178.00 ft
40.00 ft
3,212.00 ft2
Form SW40 1 -Infiltration Basin -Rev 5 11Apr2011 Parts I & 11 Design Summary, Page 1 of 2

Form SW401-Infiftration Basin-Rev.5 11Apr2011 Parts I. & II. Design Summary, Page 2 of 2
Permit No
(to be provided by DWQ)
Additional Information
Maximum runoff to each inlet to the basin?
2.00
ac -in
OK
Length of vegetative filter for overflow
NIA
ft
OK
Distance to structure
NIA
ft
OK
Distance from surface waters
NIA
ft
OK
Distance from water supply well(s)
NIA
ft
OK
Separation from impervious soil layer
2.00
ft
OK
Naturally occuring soil above shwt
2.00
ft
OK
Bottom covered with 4 -in of clean sand?
Y
(Y or N)
OK
Proposed drainage easement provided?
NIA
(Y or N)
OK
Capures all runoff at ultimate build -out?
NIA
(Y or N)
OK
Bypass provided for larger storms?
Y
(Y or N)
OK
Pretreatment device provided
Storm Inlets
Form SW401-Infiftration Basin-Rev.5 11Apr2011 Parts I. & II. Design Summary, Page 2 of 2

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