SW8940120_HISTORICAL FILE_19991130

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 614ok'aL)
DOC TYPE
El CURRENT PERMIT
El APPROVED PLANS
X HISTORICAL FILE
El COMPLIANCE EVALUATION INSPECTION
DOC DATE
liql 11,56
YYYYMMDD

1 4
V
Wizil voll
TRIPP ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: (910)76')-5100- FAX: [phone]
LETTER OF TRANSMITTAL
Job No.qqcll�q
To: Date:
Attention: LI, ylax� Low 15 —Sulbject:14� Vort�y
FAX TRANSMITTAL: NUMBER OF PAGES INCLUDES COVER —
I am sending you: (��TTACHED ( ) UNDER SEPARATE COVER
( ) Prints ( ) Tracings ( ) Copy of letter ( ) Specifications ( ) Other
These are transmitted as checked below:
Z�)'For Approval ( ) For Your Use ( ) Sign & Return Review
Remarks:
cc:
Signed-^�('O-

STATE OF NORTH CAROLINA, Department of Environmental Quality,
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 [phone]
FILE ACCESS PECORD
DFQ SECTION: j>6A&t_& — SL.) REVIEW TIME/ DATE:
4."
NAME: EMAIL: 'l'r)C,. co r�i
REPRESENTING:' PHO E: I
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Payment maV be made by check, moneV order, or cash at the reception desk.
5. FILES MUST BE KEPT IN ORDER YOU FOUND THEM. Files may not be taken from the office. To remove,
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$500.00. No briefcases, large totes, etc. are permitted in the file review area.
6
:::�Necessary large plan copies can be scheduled with Canieroil.We�iver((i)iicdenr,,_,ov 919-796-7475 for a later date/time at
an offsitc location at your expense. Large piaE co ies needed should be attached on top of the file. Allways Gr PLICS
can be contacted to set up payment ptions. Written questions may be left with this completed form and a staff
7. In accordance with General Statue 25-3-512, a $25.00 processing fee will be charged and collected for checks on which
payment has been refused.
FACILITY NAME
2. ?y �r_t
3.
4.
5.
COUNTY
4
12" 05 Lq �'15- qi�'o
Firm/Businc /YY Time In Time Out
rignaturVanidme of Ft
COPIES MADE PAID
I.NVOfCE
GJADM/Shued/Filc Review Access Form rev 2018

7/22199
CDC
JERRY PORTER EXPANSION
Stormwater Calculations
99059
Total Drainage Area
sq. ft. acres
181.210 1 4.16 1
ImporMAMS
I.and Use
sq. ft.
acres
buildings
)92
0.19
parkinglasph ft
1 141
3.31
concrete
365
0.01
1
ITotal
1 152.598
3.50
Stormwatet Calculationsd
Time of Concerdration
Hydraulic Length (L) - 783 ft.
change In Heigh (H) - 3 ft.
To (L3 111) 3" 1 128
11.26 min.
Flow for 10 year, 6 hour Stomn (010)
QfftE CPRE) X (110) 1 (Area)
6,55 cts
Q, (Cmv) x (110) x (Area)
22.01 cfs
boll
CN (98)(% imp.) + (60)(1-% imp.)
93
P- 4.82 in. forlOyr, 6 hr storm
S- I000iCN - 10
0.75
Depth D- [P-(0.2)(S)j' / [P+(0.8)(S)j
4.02 in.
Time to Peak Flow:
T, [(43+ 5)( )(Area I / Qz�
I 33.D5 min�
Detention Pond Design,
Pond Size,
Elevation
(ft.)
Surface Area
(sq. ft.)
Normal Pool
1 31!Tl
7,781
Flood Pool
9.632
Top of B nk
38.00
11,160
Bottom of Pool
28.50
2,430
Provided Storage Volume:
Vol. ((Normal pool SA + Flood Pool SA) 121
x (F.P. olev. - N.P. elov.)
1 14,801 cu. ft,
% impervious - 0.842
- 84.2%
say 85.0%
CPRE 0.25
C,off (% imp.)(.95)+(1-% imp.)(.25)
0.84
110, 6.30 in/hr
1250 7.13 in/hr
Flow for 25 year, 6 hour Storm (025)
OPRE (CPRE) X (125) X too
7.42 cfs
OnST (CMM) X (125) X (Area)
24.92 cis
CN (98)(% imp.)+ (60)(1 -%imp.)
93
P 5.71 in. for 25 yr, 6 hr stomn
S- 1000/CN - 10
0.75
Depth (0)- (P-(0.2)(S)12 / [p+(o 8)(S)l
Time to Peak Flow:
—,143.5)(D)(Area)] I Q,
35.56 min.
5AWA - lj.�jv
(Chart for 90% TSS Removal for Wet Detention
I Pond without Vectotative Filter) I
State Volume Reauired for Stereos of first 1" of runoff
Vol.- [(V12)x(DA)x(%imp.))+
[(1112)x(DA)x(l-%Imp.)xCj
C - 0.2
13,193 cu. ft+
STORMWAT R
L'x
�,\kIDAROQ4%
E C E I V E s'i
f4K.&OT/0"1%
. tZ
JUL 2 7 1999 SEAL
17374 IcL
PR0J # f2A
OGRE
99059POND.xis 1 of 2 1 IV— — -I I
').T

7t22/99 JERRY PORTER EXPANSION
CDC Stannyvater Calculations
Pond Volume�
B or" 2,430 sq. ft.
N rm.�
I pool :A
o A: 7,781 sq. ft.
Vol. : I(N.P. SA + UMGM SA) / 21 x (N.P. al. - Bottom al.)
33,186 cu. ft.
Forebow
Required Volume
1 Vol. 20% of storage volume
6,637 cu. ft.
Fim for 2-day drawdovvr�:
for I st I' of slormwator,
Q Required Vol. 1 172,800 sec. (2-days)
0.076 cfs,
Required Arm of Pipe for 2-day drawdoorn:
A- 01[CdxSQRT(2xgxh)]
Cd - 0.6
9. 32.2 Us2
h - (F.P. eiev.- N.P. elev.) 12
0.85 ft.
A 0.0172 sq. ft.
Diameter of Islas for 2-day drawdovvn
DIA, SORT[(A x 4) / pil
0. 1480 ft.
1 1.78 in.
'Usw 1.75 in diameter pipe
Outlet Structure Check:
Us,ng a Wx Al'Basin,
Perimeter (L) . is ft.
0 CIA
C I% imp.)(.M + (1-% imp.)(.25)
0.154
1 7.13 in. for a 25 yr. Storm
A 4.16 Acres
24.92 cfs
a. CWXLxH5
Cw x L)
H [0 / (Cw x L)j�
Cw= 3
0.65 ft.
1 Peak elevation flood pool elevation + H
37.35 ft.
Provided Volume
Bottom SA -
1,330 sq. ft.
Normal Pool SA -
3,0135 sq. ft.
Vol. -
[(N.P. SA + Bottom SA) / 21 x (N.P. al. - Bottom al.)
8,623 cu. ft.
depth
3 ft.
Flovv for 5-day drowdavvn:
1 for I st I' of stomwater,
0 Required Vol. / 432,::sec (5-da7�-)
0.031 CIS
Required Arm of Pipe for 5-day drawdom:
A- Q/[CdxSQRT(2xgxh)]
Cd - 0.6
g . 32.2 ftj52
h - (F.P. elev. - N.P. olev.) / 2]
A 0.00;9 sq. ft. 0.85 ft.
Diameter of Pipe for 5-d2y drawdootn:
DIA, SORT((A x 4) / pil
0.0936 ft.
1 1.12 In.
M59POND.xis 2 of 2

TRwp ENGMEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] - FAX: [phone]
October 22, 1999
NCDENR
Division of Environmental Management
Water Quality Section
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Linda Lewis
Re: Jerry Porter Lincoln Mercury Isuzu
SW8 940120 Modification
New Hanover County, NC
T99059
Dear Linda:
OCT 2 5 7999
In response to your additional information request letter, dated September 20, 1999,
we offer the following:
I . The math error has been corrected.
2. The cleanout depths for the 0 & M agreement have been revised.
I The outlet structure has been labeled.
4. An additional site plan with highlighted drainage areas has been enclosed.
5. All Correspondence is labeled with the project # SW8 940120.
6. The forebay wall elevation has been raised between DI-2 and the outlet structure to
hell) with short circuiting of the pond.
7. Dimensioning of the pond has been included.
Please contact us with questions or comments, or if you require additional information.
Thank you.
Sincerely,
'I I ripp En ineering, P
Charles 1). Cazier, E.I.
CDC:dcb
Enc.

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Division of Water Quality
September 20, 1999
Mr. Jerry Porter
Jerry Porter Lincoln, Mercury, Isuzu
5501 Market Street
Wilmington, NC 28405
iZ U
NCDENR
NORrH CAROLINA DEPARTMENT OF
EN�RcwmENT AND NATURA� RESOURCES
Subject: ACKNOWLEDGMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 940120 Modification
Jerry Porter Lincoln Mercury Isuzu
New Hanover County
Dear Mr. Porter:
The Wilmington Regional Office received a Stormwater Management Permit Application for Jerry
Porter Lincoln Mercury Isuzu on July 27, 1999. A preliminary review of that information has determined that
the application is not complete. The following information is needed to continue the stormwater review:
There is a math error in the reported amount of built -upon area. Please correct the total.
2. The sediment cleanout elevations on the 0 & M are backwards. The numbers that are supposed
to go in the blanks are the larger numbers, ie., 75% of the design depth. If you put in the smaller
number, you are incorrectly allowing the depth to be reduced to an amount equivalent to 25%
of the design depth.
Please label the outlet structure on the plans.
Please provide a plan which includes the entire drainage area, highlighted, and which shows all
the development previously permitted, including existing grades.
.. 5. Please reference the project number above on all correspondence.
6. Please create a longer flow path for the runoff from DI-2 by raising the elevation of the top of
the forebay wall between DI-2 and the outlet structure. Short-circuiting is a concern.
Please provide dimensions for ALL sides of the pond.
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

Mr. Porter
September 20, 1999
Stormwater Project No. S W8 940120 Modification
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to October 20, 1999, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the
application fee. - The Division is allowed 90 days from the receipt of a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an approved
Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action
pursuant to NCGS 143-215.6A.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAI-�ADDfNFO\940120. SEP
cc: Linda Lewis
Phil Tripp, P.E.
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/I 0% Post -consumer paper

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list
The existing permit number SW8 940120 and its issue date (if known) __1/23/99
3. Specify the type of project (check one):
— Low Density X High Density _ Redevelop
4. Additional Project Requirements (check applicable blanks):
CAMA Major X Sedimentation/Erosion Control
General Permit Other
404//401 Permit _NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
Ill. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
stormwater detention pond
2. Stormwater runoff from this project drains to the Carie Fear River basin.
3, Total Project Area: 4.16 acres
4. Project Built Upon Area: 84.2 %.
5. How many drainage basins does the project have? I-
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same fonnat as below.
Receiving Stream Name
Unnamed trib. to Smith Creek
apt W
-41)raiWa -61W�siht2--' IMP
Receiving Stream Class
C-SW
Drainage Basin Area
181,210 sf
Existing Impervious Area
94,360 sf
Proposed Impervious Area
58,238 sf
% Impervious* Area (total)
84.2%
j*4 W 14 rcax,
aS66AWsl W02,
JKF&FV4_� � 'raiiifn
On-slite Buildings
8,092 sf
On -site Streets �
0
On -site Parking
49,781 sf
On -site Sidewalks
365 sf
Other on -site existing
94,360 sf
Off -site
0
Total:
Y=144,141 sf
Y=
* Impervious 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 3.99 Page 2 of 4

��ainteiiance activities shall be performed as follows:
I . After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall not be handled in a manner that wdl adversely impact water quality
(i.e. 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 an accurate
depth reading and not readdy penetrate into accumulated sediments.
4, �75
When the permanent pool depth reads i.625 feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads -0-35 feet in the forebay, the sediment shall be removed.
T�
m 4L_
BASIEN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 35.0
Sediment Removal Elevation 30.125 75%
------------------------ ----------------------
Bottom Elevation
MAIN POND
5. 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.
6. 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 possible.
Form SWU-102 Rev 3.99
Page 3 of 4

0 TRipp ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] - FAX: [phone]
lao,
O\ P�
July 27, 1999
NCDENR
Division of Environmental Management
Water Quality Section
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Linda Lewis
Re: Jerry Porter
New Hanover County, NC
TE 99059
Dear Linda:
LRECE-4
IVE
BYL
J
JUL 2 7 1999
BY:
Enclosed please find two (2) sets of plans, one (1) signed original and one (1)
copy of the application form with narrative, one (1) wet detention supplement, two (2)
sets of signed sealed calculations and one check for the application fee.
Please review for approval and contact us with any questions or comments.
Thank you.
Sincerely,
Trim) Engineering, P.C.
Phillip G. Tripp, P.E.
PGT:dcb
Enc.