SW8041220_COMPLIANCE_20050512

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 84�4 Ionic./
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
/v
DOC TYPE
❑ HISTORICAL FILE
❑ MONITORING REPORTS
DOC DATE
❑
YYYYM M DD

Permit No. 5GA)V 0 -Pa24-6__
(to be provided hr DING))
State of North Carolina
Department of Ei-ivirollim m mice Nattlrxl RCSOL,rccs
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICA"I'10N FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
QWQStormwater Management Plan Review:
A c;oml)lete stormwater management plan submittal includes an application form, a wet detention basin
supplement For each basin, design calculations, and plates and specifications showing all basil) and outlet
structure details.
I. PROJECT INFORNIATION
PI- ject 1ti�tlmc: ��%�� �S r'l'J I ---
Contact Person:�OSEj'� f jr"i Phone Number: (�) %_-
1=or 1)rojec:ts with multiple basins, spccify which basin this worksheet applies to:
Basin Bottom Elevation 1� R
1%.1- mic:ltt 11001 Elevation �'0 ft
I Mpor;sry P001 lXvaI.An �- ' U ft
(UTOS
(floor Qhe basin)
(elevar`ion of the orifice)
(elevation of the discharge s11-11cture ovc) low)
Permanent Pool Surface Area L0 I sq. ft. (wader surface area at Me (Woce elcvcuhm)
Drainage Area !1' 1!05 3 ae. (mi-.rite and off -site drainage to the baser))
lmllervious Area 13(-- 3 a S ac. (on -.rite awl off -sire (lr eiincigw ro Me basin)
l�r)i1rrJ1('S'
PCI-111,lnCn[ fool VollfSlZe f�/i yg� cU. R. (corrrbhwd vor mie of main basin cma` f)rvbav)
l erllpOrary P001 VO1LInle cLI. ft. (volume delained above the per'mr -: 1cw pool)
F= ,,rebav Volume d S cu. ft. (approximately 2016 of'loml vohme)
Orher parameters
SAIlJA T (surface area to drailma("e area ratio Trott) D[Vo dahh)
Diameter of 0A ice _ �� �G _ in. (? to -5 day temporary pool drem--clown reriuhvd)
Design Rainfall / in.
UcsiL -l`SS RenlOVal 8-5 %s lrrlirrinrlurr 85r'/n reaerirerll
Form WINE Rev 3.99 Oyu I u C 4

RECEIVED
FEB 2 3 2005
DWQ
PROd #

Footnotes:
l whell using the Division SAMA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the
aC[U2l1 linpervi011S % and permanent pool depth. Linear interpolation should be employed to determine the Correct va1tlC for I1011-
standard table entries.
2 In the 20 coastal COUnties, the regUirement for a vegetative filter may be waived if the wet detentioIl basin is designed to provide
90% TSS removal. The NCDi NR BMP manual provides design tables for both 85% TSS removal and 90°/, TSS removal.
11. REQUIRED ITEMS CHECKLIST
The following checklist OLr[11neS design requirements per the Stormwater Best N1aMagenient PraCtiCCS M',tIltlal
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Codc
Section: 15 A NCAC 21-1 .1005.
Initial in the space provided to indicate the following design requirements have been met and supposing
dOCUmentation is attached. if the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Applicants Initials
a.
b
\~ c.
d.
ADDC-1) ��RFFLEf.
W A-1TS-
g
11.
i.
k.
r
a`
The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
The forebay volume is approximately equal to 20% of the basin volume.
The temporary pool controls runoff from the design storm event.
The temporary pool draws down in 2 to 5 days.
11'required, a 30-foot vegetative filter is provided at the outlet (include non -erosive HOW
calculations)
The basin length to width ratio is greater than 3:1.
The basin side slopes above the permanent pool are no steeper than 3:1.
A submerged and vegetated perimeter shelf with a slope of'6:1 or less (show detail).
Vegetative cover above the permanent pool elevation is specified.
A trash rack or similar device is provided for both the overflow and orifice.
A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
If -the basin is used for sediment and erosion control during construction, clean out of'111C
basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an emergency.
III. W 'f DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
'Phis system (check ogre) does 0 d not incorporate a vegetated filter at the outlet.
'this system (check acre) 0 does does not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

klaintenance activities shall be performed as follows:
4
After every significant runoff producing rainfall event and at least monthly.
a. Inspect the wet detention basin system for sediment accwnnulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occtI1-s within
2 to 5 days as designed.
Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, tnnow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to matritatn
proper functioning.
Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 759/0 of the original design depth (see diagram below). Removed sediment shall be disposed of
in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (Le.
stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give all accurate
depth reading and not rcaddy penetrate into accumulated sediments.
When the permanent pool depth reads _.��feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads { 3 0ect in the forebay, the sediment shall be removed.
Sediment Rea oval El, 710 75
Bottom I:Ir ation- Ci--� 7 %,
1,ORE,BAY
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation -l--Y6
Sediment Removfl Elevation , ,. a 75%
----------------_-------------------------------
--
Bottom Elevation 90,0 25'%
IMAIN.NOND
Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through
the emergency drain shall be minimized to the maximum extent practical.
Form SWU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance -of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name:�/C i`-I M
Title: OVJI'J6
Address:_ i�,1� �vc'y lJ (e c &W ` 4-,D M iD wf}'c' �/�7� /!1 as-5w
Phone:
Signature,
Date: 1
&-c-E4 3 C 2 :200
Note: The legally responsible party should not be a homeowners association unless more than 50% of.the lots have been sold and a
resident of the subdivision has been named the president.
!! r
EP Gj av N�/�c� �� By_l�,a�
I, a Notary Public for the State of _� I'T/�
County of 7' do hereby certify that 1 Im Y_ �� lo4l)
personally appeared before me this fS day of --P6iE"1'3 tX. 2a65' , and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
RI WFOIPIE
My commission expires 3 J'09'v
Form SWU-102 Rev 3.99 Page 4 of

l

WHITE OAK RIVER BASIN
Name of Stream Subbasin Stream Index Number Map Number Class
Little Ramhorn Branch
WOK03
21-4-1
H31SW6
C
Little Run
WOK03
21-2-1
H31SW5
C
Lodge Creek
W0703
21-14
H31SEB
C
Lynch Creek
WOK04
21-35-1-4
H32SW9
SA;HQW
Main Prong
WOK03
21-16-1
H31SE5
C
Mairey Branch
WOK03
21-3-1
H31SW7
C
Margaret Branch
WOK02
19-4-3
H29NW9
C;NSW
Maria Creek
WOK04
21-35-7-13-1
H33SW2
SA;ORW
Meadows Branch
WOK03
21-5
H31SW9
C
Middens Creek
WOK04
21-35-7-24
H32SE9
SA;HQW
Mile Hammock Bay
WOK02
19-41-2
I29SE5
SA;HQW
Mill Creek
WOK02
19-9
H29SWB
SC;NSW
Mill Creek
WOK02
19-30-1
I29NW8
SA;HQW
Mill Creek
WOK02
19-39-3-1
I29SW8
SA;HQW
Mill Creek
WOKO1
19-41-11-1
I30NW7
SA;HQW
Mill Creek
WOKO1
20-29-1-1
I30NE2
SA;HQW
Mill Creek
WOK03
21-19
H31SE9
SA;HQW
Mill Run
WOK02
19-17-7
I29NW5
SC;NSW
Mill Swamp
WOK02
19-3-1
H28NE5
C;NSW
Milldam Branch
WOK03
21-3-6
H31SWB
C
Millis Swamp
WOK03
21-3-2
H31SW7
C
Millstone Creek
WOK02
19-30-3-1
I29SW1
SA;HQW
Mingo Creek
WOK04
21-35-7-10-3
H33NW9
Sc
Mirey Branch
WOK02
19-41-5-3
I29SE3
SA;HQW
Mirey Branch
WOK01
20-7
H30NW7
C
Money Island Bay
WOK03
20-36-13
I32NW4
SA;HQW
Money Island Slough
WOK03
20-36-13-1
I32NW4
SA;HQW
Money Island Swamp
WOK03
21-16-2
H31SE5
C
Morgan Bay
WOK02
19-18
I29NWG
SC;NSW
Matt Creek
WOK02
19-16-3
I29NE1
C;NSW
Muddy Creek
WOK02
19-30-2
I29NW8
SA;HQW
Mulberry Creek
WOK01
20-13
H30SW4
C
Mullet Cove
WOK05
21-35-7-31
I33NW4
SA;ORW
Mullet Gut
WOKO1
20-29-2-1
I30NE1
SA;HQW
Mundine Branch
NEU11
20-6
H29NE6
C
Mundine Branch
WOKO1
20-6
H29NE6
C
NEW RIVER
WOK02
19-.(1)
H28NW3
C;NSW
NEW RIVER
WOK02
19-(7)
H29SWB
SB;NSW
NEW RIVER
WOK02
19-(10.5)
H29SWB
SB;HQW,NSW
NEW RIVER
WOK02
19-(11)
I29NW2
SC;HQW,NSW
NEW RIVER
WOK02
19-(15.5)
I29NW2
SC;NSW
NEW RIVER
WOK02
19-(27)
I29NE7
SA;HQW
NEWPORT RIVER
WOK03
21-(1)
H31SW9
C
NEWPORT RIVER
WOK03
21-(17)
H31SE9
SA;HQW
Negro Creek
WOK05
21-35-7-4
H33SE2
SA;HQW
Nelson Bay
WOK04
21-35-7-10-(1)
H33NW9
SC
Nelson Bay
WOK04
21-35-7-10-(5)
H33NW9
SA;HQW
New River Restricted Area 9 1
WOK02
19-31
I29SW2
SC
New River Restricted Area 4 2
WOK02
19-37
I29SE4
SC
Newby Creek
WOK04
21-35-1-8
I32NW3
SA;HQW
Newport River Restricted Area (Morehead City
WOK03
21-31
I32NW2
SC
Harbor)
North Fork White Oak River
WOKO1
20-2
H29NW6
C
North Leopard Creek
WOK04
21-35-1-7-2
H32SEB
SA;HQW
Page 5 of 8

NC DENR - DIVISON OF WATER QUALITY
.0312 WHITE OAK RIVER BASIN
2B .0300
Classification
Name of Stream
Description
Class
Date
Index No.
Little Northeast Creek
From source to Northeast
C;NSW
08/01/91
19-16-2
Creek
Horse Swamp
From source to Little
C;NSW
08/01/91
19-16-2-1
Northeast Creek
Rocky Run
From source to Little
C;NSW
08/01/91
19-16-2-2
Northeast Creek
Poplar Creek
From source to Little
C;NSW
08/01/91
19-16-2-3
Northeast Creek
Mart Creek
From source to Northeast
C;NSW
08/01/91
19-16-3
Creek
Northeast Creek
From N. C. Hwy.24 to
SC;HQW,NSW
08/01/91
19-16-(3.5}
downstream side of mouth
of Scales Creek
Scales Creek
From source to Northeast
SC;HQW,NSW
08/01/91
19-16-4
Creek
Northeast Creek
From the downstream side
SC;NSW
08/01/91
19-16-(4.5)
of mouth of Scales Creek
to New River
Southwest Creek
From source to Mill Run
C;NSW
08/01/91
19-17-(O.5)
Catherine Lake Creek
From Catherine Lake to
C;NSW
08/01/91
19-17-1
Southeast Creek
Catherine Lake
Entire Lake
B;NSW
06/01/91
19-17-1-1
Deep Run
From source to Southwest
C;NSW
08/01/91
19-17-2
Creek
Harris Creek
From source to Southwest
C;NSW
08/01/91
19-17-3
Creek
Haws Run
From source to Southwest
C;NSW
08/01/91
19-17-4
Creek
Tank Creek
From source to Southwest
C;NSW
08/01/91
19-17-5
Creek
Hicks Run (Hickory Run)
From source to Southwest
C;NSW
08/01/91
19-17-6
Creek
Southwest Creek
From Mill Run to New River
C;HQW,NSW
08/01/91
19-17-(6.5)
Mill Run
From source to Southwest
SC;NSW
08/01/91
19-17-7
Creek
Morgan Bay
Entire Bay
SC;NSW
08/01/91
19-18
Lewis Creek
From source to New River
SC;HQW,NSW
08/01/91
19-19
Wallace Creek
From source to New River
SB;NSW
08/01/91
19-20
Bearhead Creek
From source to Wallace Creek
SB;NSW
08/01/91
19-20-1
Beaverdam Creek
From source to Wallace Creek
SB;NSW
08/01/91
19-20-2
Town Creek
From source to New River
SC;HQW,NSW
08/01/91
19-21
Parnell Bay
Entire Bay
SC;NSW
08/01/91
19-22
Cogdels Creek (Coglin Creek)
From source to New River
SC;NSW
08/01/91
19-23
Frenchs Creek
From source to New River
SC;NSW
08/01/91
19-24
Jumping Run
From source to Frenchs Creek
SC;NSW
08/01/91
19-24-1
2

.. T4
Q�N CA
ones
S°
ti 2OQQOF�ss�oti�,?9
SF..AL
7 J 13301 ; c
`' 7j D of � RECEIVED
APR 2 9 2005
BY:v) USo�rz2d
WET POND REQUIREMENTS
DRAINAGE AREA = ACRES / SF 4.6658 ACRES/203,241 SQUARE FEET
EXISTING AND PROPOSED IMPERVIOUS AREA IN SQUARE FEET:
EXISTING ON -SITE BUILDINGS = 800 SF
EXISTING ON -SITE STREETS = 2,400 SF
PROPOSED NEW BUILDINGS = 48,000 SF
PROPOSID NEW STREETS = 85,133 SF
TOTAL = 13..6,133 SF
I'l.RC1 N"1' IMPERVIOUS { 1) = 136,333/203,241 = 0.67
THEREFORE USE = 70 '%
POOL DEP'1'}-I - 4.0'
`1'SS = 85`%o (Therefore filter is required)
SA/DA `Vo - 136,333/203,241 4.50/,, = (0.0450)
!MINIMUM REQUIRED SURFACE. AREA AT 1'1?RMANE-NT P()()L
= 0.0450 x 4.6658 ACRES = 0.209961 ACRES = 9,146 SQUARE FFIFT
!\MINIMUM REQUIRED VOLUME OF -TEMPORARY POOL
(Simple Method -preferred by DWQ)
Rv _ 0.05 + 0.009 (70 )=0.68
VOLUME = (1" / 12 in/ft) x 0.68 x 4.6658 x 43,560 SF/ACRE = 11,517 CU13IC FEET'
0

•
•
0

0
•
•
TOTAL BASIN SIZE
EI..EVATION
IN FT.
AREA IN
SF.
AVERAGE
AREA IN SF
DEPTH IN
FEET
SUES -TOTAL
STORAGE
IN CF
"DOTAL.
STORAGE
IN CF
90
3866
4218
1
4218
91
4570
4215
4946
1
4946
92
5322
9164
5739
l
5739
93
6156
14903
6581
1
6581
94
7014 permanent
pool side
21484
94
3132 forebay
side
94
total both sides
10146 actual
9146 required
11522 actual
1 1517 required
so ok
l
11522
temporary pool
1 foot deep
95
12998
1
i I
NOTE; THE ABOVE DATA ARE ABSOLUTE VALUES TAKEN FROM 3-1) COMPUTER
DRAWINGS

•
FOREBAY DATA
ELEVATION
IN FT.
AREA IN
SF.
AVERAGE
AREA IN SF
DEPTH IN
FEET
SUB -TOTAL
STORAGE
1N ci=
TOTAL
STORAGE
IN CF
90
196
524
1
524
91
852
524
1165
1
1165
92
1478
1689
1842
1
1842
93
2206
3531
2669
1
2669
94 lorebay side
3132
6200 actual
4297 rcquirvd

•
0
FOREBAY DATA
TOTAL BASIN VOLUME = 21,484 CUBIC FEET
FOREBAV VOLUME REQUIRED = 20'%, THEREFORE
0.2 (21,484) = 4,297 CUBIC FEET REQUIRED
ACTUAL FOREBAY VOLUME = 6,200 CU131C FEET THEREFORE OK
iN`OTE; THE ABOVE DATA ARE ABSOLUTE VALUES TAKEN FROiNI 3-1) COi\IPUTFR
DIIAWINGS
PERM POOL CALCULATIONS
SURFACE AREA PROVIDED FOR I'P = 10,146 SQUARE FEET WHICH 1S GREATER "THAN
REQUIRED 9,146 SQUARE FEET AT ELEVATION OF 94,00'
(AREA AND VOLUME TAKEN FROM COMPUTER MODELING)
TEMP POOL CALCULATIONS
NEED AT LEAST11,517 (USING COMPUTER MODELING DATA) CU131C 1' "ET 01' S'I-OIZA(-,I•_
(I l,522 - 11,517 = L00') TIIEREFOR1, TEMP POOL 1.00' 1)E:EP
SET ELEVATION OF TEMPORARY POOL rr = 95.00'
SURFACE AREA OBTAINED FROM COMPUTER MODELING EQUALS
12,898 SQUARE FEET Gal ELEVATION OF 95.00'.
TOTAL VOLUME PROVIDED ABOVE PERM POOL= 11,522 CUBIC FEET WHICH 1S GREATER
THAN THE REQUIRED AMOUNT OF 11,517 CU131C FEET

0 ORIFICE SIZING
AREA OF 3/4" CIRCULAR ORIFICE = 0.0030079
All FA OF I" CIRCULAR ORIF]CF = 0.0115454 FT,
AREA OF 1.5" CIRCULAR ORIFICE = 0,012272 I,'p,
AREA OF 2" CIRCULAR ORIFICE = 0.021817 FI"
AREA OF 2.25" CIRCULAR ORIFICE, = 0.027612 FT1
AREA OF 2.5" CIRCULAR ORIFICE = 0,034088 FT2
USE REQUIRED VOLUME OF TEMP POOL, NOT ACTUAL VOLUME
(USE 11,517 CF)
Qz wu = 11,517 - 172800 (SECONDS FOR 2 DAY PERIOD) = 0.066649 CFS
(Flo v rate required Fora 2 day draw down)
QS[),\). = 11,517 - 432000 (SECONDS FOR 5 DAY PERIOD) = 0.0266597 CFS
(Flow rate requires[ tiara 5 da), draw clown)
CHOOSE A L50" CIRCULAR ORIFICE
HEAD=''/x'I'I-IE DEPTH OFTEMP. POOL OF (1.00 FEET) OR (0.5 FEET')
COEFFICIENT USED FOR ORIFICE: ENTRANCE = 0.63
EQUATION USED Q = C* A( 2GII)' Q= 0.63*0.012272*(2*32.2*0.5) '' = 0.04387 CFS
TWO DAY DRAW DOWN > VOLUME THROUGH ORIFICE > FIVL' DAY DRAW DOWN
Q=0.0 19454 C FS.......... (0.066649>0.04387>0.0266597) "1' I I E It I: I'O R I: O K
THEREFORE USE 1.50" ORIFICE

WET'DETENTION POND ANALYSIS
FILE NAME:
PROJECT#: SW8 041220.feb05
PROJECT NAME: Adams Mini Storage
S:1WQS1POND1041220.fe1b05.WK1
REVIEWER:
DATE: 13-Feb-05
Receiving Stream: Motts Creek Class: C NSW
Drainage Basin: White Oak Index No.
Site Area 4.67 acres
Drainage Area 2 03T.00:' square feet Area in Acres 4.67
IMPERVIOUS AREAS
Buildings
Parking
SW
TOTAL
SURFACE AREA CALCULATION
48800,00 square feet
85533.00 square feet
square feet
square feet
square feet
square feet
square feet
001 1-53— jsquare feet
Rational C
Rational Cc= 0.07
% IMPERVIOUS
6T08%
SA/DA Ratio
4,30%
Des. Depth
4
Req. SA
8730 sf
TSS:
85
Prov. SA
sf
VOLUME CALCULATION * place a "ll" in the box if Rational is used
Rational ?*
Des. Storm
':
0)
inches
Rv=
0.654
Bottom
90 msl
Perm. Pool
msl
Design Pool
95 msl
Storage met @elev 94,96 msl
ORIFICE CALCULATION
FOREBAY
Perm. Pool Volume= 21484
Req. Forebay Volume= 42C-6.8
Provided Volume= 6200.00
Percent= 11."c��ii!'28,0%:;;
Elevation
94.00
95.00
Area
10146.00
12898.00
.Inc. Vol.
11522.00
Avg. Head =
0.48 ft
Q2 Area =
2.77
sq. inches
Flow Q2, cfs
0.064 cfs
Q5 Area =
1.11
sq. inches
Flow Q5, cfs
0.026 cfs
Orifice Area
0.79
sq. inches
No. of Orifices
!;. .1 .1
Q=
0.018
cfs
Acc. Vol.
0.00
11522.00
Diameter, inches 1.00! weir H x W in x n
Drawdown days Surface Area @DP 12898 sq. ft.
jo!
Falling Head Drawdown = 10.2 days
C: 3.317916667 L= -0.096
COMMENTS
Surface Area and Volume are within Design Guidelines. Orificeistoo small