SW8010517_HISTORICAL FILE_20100825

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. I SW e& I 057 rI
DOC TYPE El CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
i DOC DATE
YYYYMMDD
B

A��A
NCDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
August 25, 2010
Mr. R. S. Mall, Sr. Executive Vice President
NC State Employee's Credit Union
1000 Wade Avenue
Raleigh, NC 27605
Division of Water Quality
Coleen H. Sullins
Director
Subject: PERMIT RENEWAL REQUEST
Stormwater Permit No. SW8 010517
SECU Jacksonville
Onslow County
Dear Mr. Hall:
Dee Freeman
Secretary
The Division of Water Quality issued a Coastal Stormwater Management Permit, Number SW8 010517 to SECU
Jacksonville for a High Density project on September 15, 2001. This permit expires on September 15, 2011. Per
15A NCAC 2N.1003(h) (the stormwater rules), applications for permit renewals shall be submitted 180 days prior
to the expiration of a permit and must be accompanied by a processing fee, which is currently set at $505.00. If
this is still an active project please complete and submit the enclosed renewal application prior to March 15, 2011
If this project has not been constructed and a permit is no longer needed, please submit a request to have the
permit rescinded. If you have sold the project, or are no longer the permittee, please provide the name, mailing
address and phone number of the person or entity that is now responsible for this permit. Enclosed is a form for
change of ownership, which should be completed and submitted if the property has changed hands.
Your permit requires that upon completion of construction and prior to operation of the permitted stormwater
treatment system, a certification of completion be submitted to the Division from an appropriate designer for the
type of system installed. This is to certify that the permitted facility has been installed in accordance with the
permit, the approved plans, specifications and supporting documentation. Please include a copy of the certification
with your permit renewal request and processing fee. Enclosed is a copy of a sample certification. Also enclosed
is a new Operation and Maintenance agreement that should be completed and submitted along with your renewal
application.
You should be aware that failure to provide the Designer's Certification and the operation of a stormwater
treatment facility without a valid permit, are violations of NC General Statute 143-215.1 and may result in
appropriate enforcement action including the assessment of civil penalties of up to $10,000 per day.
If you have any questions, please feel free to contact David Cox at 910-796-7318.
Sinc rely,
CD
Georgette colt, Stormwater Supervisor
Surface Water Protection Section
Wilmington Regional Office
Enclosures
GDSldwc S:\WQS\Stormwater\Renewal\Requests\2001\010517.aug10
cc: Wilmington Regional Office File
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One
Phone; 910-796-72151 FAX: [phone]Customer Service: 1-877-623.6746 Nora_h Carob nil
Internet. www.ncwaterqualily.org `J► ��������[� ,
An Equal Opporlunily 4 Affumalive Aclion f mpfoycr � �/ `J

State Stormwater Management Systems
Permit No. SW8 010517
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and
other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
NC State Employee's Credit Union
SECU Jacksonville
Onslow County
FOR THE
construction, operation and maintenance of wet detention pond in compliance with the provisions of 15A NCAC
21-1 .1000 (hereafter referred to as the "stormwater rules' and the approved stormwater management plans and
specifications and other supporting data as attached and on file with and approved by the Division of Water Quality
and considered a part of this permit.
This permit shall be effective from the date of issuance until September 15, 2011 and shall be subject to the
following specified conditions and limitations:
1. DESIGN STANDARDS
This pert -nit is effective only with respect to the nature and volume of stormwater described in the
application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as described on page
3 of this permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from
54,245 square feet of impervious area. This pond must be operated with a vegetated filter.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts
of the permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per
approved plans.
5. The built -upon area for the future development is limited to none.
b. The runoff from all built -upon area within the permitted drainage area of this project must be directed into
the permitted stormwater control system.-

State Stormwater Management Systems
Permit No. SW8 010517
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
SECU Jacksonville
SW8 010517
Onslow County
Mr. R.S. Hall, Sr. Executive Vice President
NC State Employee's Credit Union
1000 Wade Avenue
Raleigh, NC 27605
Application Date: September 15, 2001
Name of Receiving Stream/Index 4: White Oak / Scales Creek / 19-16-4
Classification of Water Body: "SC HQW NSW"
If Class SA, chloride sampling results: n/a
Pond Depth, feet:
Permanent.Pool Elevation, FMSL:
Drainage Area, acres:
Total Impervious Surfaces, ft2:
Offsite Area entering Pond, ft2:
Required Surface Area, ft2:
Provided Surface Area, ft2:
Required Storage Volume, tt':
Provided Storage Volume, III:
Temporary Storage Elevation, FMSL:
Controlling Orifice:
5.25
40.25
1.66
54,245
None, per Engineer
2,694
2,754
4,369
5,848
42
0.75" T pipe
3

State Stormwater Management Systems
Permit No. SW8 010517
11. SCHEDULE OF COMPLIANCE
The stormwater management system shall be constructed in it's entirety, vegetated and operational for its
intended use prior to the construction of any built -upon surface.
During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
The permittee shall at all times provide the operation and maintenance necessary to assure the permitted
stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must
be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited
to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
c. Mowing and revegetation of side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping.
g. Access to the outlet structure must be available at all times.
h. The vegetated filter will be kept grassed with no erosion. The spreader mechanism will be kept free
of sediment and trash, and must distribute the runoff evenly over the width of the filter.
4. Records of maintenance activities must be kept and made available upon request to authorized personnel
of DWQ. The records will indicate the date, activity, name of person performing the work and what actions
were taken.
5. Decorative spray fountains will not be allowed in the stormwater treatment system.
6. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless
the facilities are constructed in accordance with the conditions of this permit, the approved plans and
specifications, and other supporting data.
7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of
this permitted facility, a certification must be received from an appropriate designer for the system installed
certifying that the permitted facility has been installed in accordance with this permit, the approved plans
and specifications, and other supporting documentation. Any deviations from the approved plans and
specifications must be noted on the Certification.
8. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior
to operation as a stormwater treatment device, and prior to occupancy of the facility.
9. A modification must be permitted prior to any construction. The following items will require a modification
to the permit. The Director may determine that other revisions to the project should require a modification
to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or drainage area.
C. Further subdivision, acquisition, or sale of the project area. The project area is defined as all property
owned by the permittee, for which Sedimentation and Erosion Control Plan approval was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
10. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum
of ten years from the date of the completion of construction.
2

State Stormwater Management Systems
Permit No. SW8 010517
11. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the
approved plans, prior to construction. If the proposed BUA exceeds the pemitted amount, a modification
to the permit must be submitted and approved prior to construction.
12. Prior to the sale of any portion of the property, an access/maintenance easement to the stormwater facilities
shall be granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale
of any portion of the property.
13. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable
built -upon area.
14. The Director may notify the permittee when the permitted site does not meet one or more of the minimum
requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written
time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall
provide copies of revised plans and certification in writing to the Director that the changes have been made.
15. The permittee shall notify the Division of any name, ownership or mailing address changes within 30 days.
III. GENERAL CONDITIONS
l . This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there
is a name change of the Permittee, a formal permit request must be submitted to the Division of Water
Quality accompanied by an application fee, documentation from the parties involved, and other supporting
materials as may be appropriate. The approval of this request will be considered on its merits and may or
may not be approved.
2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to
enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute
143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules,
regulations, or ordinances which may be imposed by other government agencies (local, state, and federal)
which have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions,
the Permittee shall take immediate corrective action, including those as may be required by this Division,
such as the construction of additional or replacement stormwater management systems.
The permittee grants DENR Staff permission to enter the property for the purpose of inspecting all
components of the permitted stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a
permit modification, revocation and reissuance or termination does not stay any permit condition.
Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the
guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual.
Permit issued this the 15th day of September, 2001.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Gregory J. Thorpe, Ph. D., Acting Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 010517
5

P. I
c;•
FILE MODE
5b9- MEMORY TX
* . * COMMUNICATION RESULT REPORT ( JUL.11.2001 9:20AM ) * * f
OPTION
------------------------------------------
REASOrl FOR ERROR
E-1) HANG UP OR LIME FAIL
E-3) 1,10 ANSWER
ADDRESS (GROUP)
8-9192338031
TTI NCDENR WIRO
RESULT-PAGE
-----0-� ----------
E-2) BUSY
E-4) NO FACSIMILE CONNECTION
North Carolina
Department of Environment and Natural Resources
Division of Water Quality
Wilmington Regional Office
Michael. F. Easley, Governor
William G. Ross, Jr., Secretary
FAX COVER SHEET
Date: July 11, 2001
To: Jonathan Ealuns, P.L.
Company: McKim and Greed
FAX #: [phone]
DWQ Stormwater Project Number: SW8 SW8 010517
Project Name: SLCU Jacksonville
ABSAGE:
O: 0 rPages:
Y+'rom: Linda Lewis Aj�
Water Quali eet�n - Stormwater
FA 910-350-2004
Phone # [phone]
Dear Mr. Eakins:
The nrniect was received on Mav 15. 2001. I am current]-% runniniz about 60 days for an initial review. Vm sure it

North Carolina
Department of Environment and Natural Resources
Division of Water Quality
Wilmington Regional Office
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
FAX COVER SHEET
Date: July 11, 2001
To: Jonathan Eakins, P.E.
Company: McKim and Creed
FAX #: [phone]
DWQ Stormwater Project Number: SW8 SW8 010517
Project Name: SECU Jacksonville
MESSAGE -
Dear Mr. Eakins:
09"FA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
No. of Pages: I
From: Linda Lewis
Water Quality Section - Stormwater
FAX # [phone]
Phone # [phone]
The project was received on May 15, 2001. 1 am currently running about 60 days for an initial review. I'm sure it
won't be much longer. I'lease remember that by law, we have 90 days to respond.
Thanks, for your patience.
Linda
S:IWQSIS'I'0RMWATIADDINF0ISW8 010517.JUL
127 Cardinal Dr, F,xl., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunily Affirmative Action Employer 50% recycled/10% post -consumer paper

�McKJM&CREED
To: NCDENR
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
ATTENTION: Linda Lewis
LETTER OF TRANSMITTAL
DATE: September 5, 2001
PROJECT NO: 1 51 7-0048
TASK NO:
RE: SECU — Jacksonville
Water Quality Pond
TRANSMITTAL NO:
PAGE 1 OF 1
WE ARE SENDING: ❑ Originals ❑ Prints F1 Shop Drawings Samples
Specifications 0 Calculations ❑ Other -
Quantity
Drawing No.
Rev.
Description
Status
2
LA-4
2
Grading/Storm Drainage and Erosion Control Plan
nwQ
PROD #
Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid
E. Construction F. For Review & Comments G. For Approval H. See Remarks
Action Status Code: 1, No Exceptions Taken 2. Make Corrections Noted 3. Other
4. Amend & Resubmit 5. Rejected - See Remarks
REMARKS:
Ms, Lewis:
Attached are two copies of Sheet LA-4 that have been revised per your comment in a fax dated September
4, 2001. Please respond to this final submittal as soon as possible as the owner and contractor ae ready to
begin construction at the site. Please do not hesitate to contact me if you have any questions or need any
additional information.
5625 DILLARD ROAD, SUITE 117, CARY, NC 27511 9191233-8091 FAX [phone]
cc: Toby Savage, O'Brien/Atkins Architects McKIM & CREED ENGINEERS, PA
Signe
Jon th P. Ins, PE
S:11517\0048\10-CommlTransmittal LLewis - 09-05-01.doc

`�'' Michael F. Easley, Governor
LF
William G. Ross, Jr.,. Secretary
North Carolina Department of Environment and Natural Resources
FAX COVER SHEET
Date: September 4, 2001
To: Jonathan Eakins, P.E.
Company: McKim and Creed
FAX #: [phone]
DWQ Stormwater Project Number: SW8 010517
Project Name: SECU Jacksonville Modification
MESSAGE:
Dear Mr. Eakins:
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
Wilmington Regional Office
No. of Pages: 1 '
From: Linda Lewis
Water Quality Section - Stormwater
FAX [phone]
Phone # [phone]
Please label the required 3:1 or flatter side slopes on the vegetated filter and submit 2 copies of the revised sheet
LA-4.
S:IWQSIST0RMWA'lAADDINF01010517.SE1'
UM rNR-
N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 [phone] Fax [phone] Customer Service E,
800-623-7748

WATER QUALITY POND CALCULATIONS
Project Name
SECU - Jacksonville
Project Number
01517-0048
Date
07-May-01
b�ee�etaQe�aif4
QUO
SAL -
64 -
G�4� a .'
tooAis@%;"N,a
RECEIVED
JUL 3 0 '2001
DWQ
PROJ # SGv 67oioS/ 7
3rd revision
2nd revision
1 st revision
26-J u I-01

Water Quality Pond Drainage Area Data
Project SECU - Jacksonville
Project No. 01517-0048
Date 26-Jul-01
Total site area 96,939 square feet = 2.23 acres
Impervious areas
Drainage
area to pond
Other Drainage Area
Existing
[sf]
Proposed
[sf]
Change
[sf]
Existing
[sf]
Proposed
[sf]
On -site buildings
4,664
7,300
+ 2,636
0
0
On -site streets
0
0
0
2,025
925
On -site parking
37,895
44,185
-}- 6,290
0
0
On -site sidewalks
2,340
2,760
420
0
0
Other on -site
0
0
0
0
0,
Total off -site impervious
0
0
0
0
0
Total Impervious
44,899
54,245
9,346
2,025
925
Non -impervious areas
Drainage
area to pond
Other Drainage Area
Existing
[sf]
Proposed
[sf]
Change
[sf]
Existing
[sf]
Proposed
[sf]
On -site grass/landscape
22,441
17,855
-4,586
0
0
On -site woods
0
0
0
0
0
Other undeveloped
0
0
0
0
0
Total off -site non -impervious
0
0
0
0
0
Total non -impervious
22,441
17,855
-4,586
0
0
Total Drainage Area
67,340
72,100
4,760
2,025 925
Percent Impervious
66.7
75.2
100.0 100.0
Notes:
1. The areas noted in the existing conditions column are based on a survey of the site. These values may differ from
the permitted values/areas.
2. The drainage area to the pond has become larger because some existing area that currently drains away from the
pond is being diverted into the pond.
3. The "Other' Drainage Area currently drains to the storm sewer along Moosehaven Road.
4. The site is currently permitted for 63,876 square feet of impervious area and 80.4% impervious.
Water Quality Pond Calculations 26 July 2001.xls
Site Drainage Area Data Page 2 of 7
Printed 7/27/01 4:45 PM

Water Quality Pond Surface Area Calculations
Project
Project No
Date
SECU - Jacksonville
01517-0048
26-Jul-01
Total drainage area to pond 72,100 square feet
Total impervious area in drainage area 54,245 square feet
Water depth of basin at normal pool 5.25
Location of site Jacksonville, NC
Site region Coastal
% Impervious cover 75.2 percent
If the site is in a coastal area, will a vegetative filter be used?
Surface Area/Drainage Area Ratios:
feet
For a site in the Piedmont 2.2 percent
For a site in a Coastal County wl Vegetative Filter 3.7 percent
For a site in a Coastal County wlout Vegetative Filter 5.1 percent
Required surface area of pond:
For a site in the Piedmont 1,560.0 square feet
For a site in a Coastal County w/ Vegetative Filter 2,700.0 square feet
For a site in a Coastal County w/out Vegetative Filter 3,680.0 square feet
Notes:
1. The site has an existing Vegetative Filter downstream of the pond that will be used.
Water Quality Pond Calculations 26 July 2001.xls
Pond Surface Area Calcs Page 3 of 7 Printed 7/27/01 4:45 PM

Water Quality Pond Stormwater Runoff Volume Calculations
Project
Project No.
Date
Drainage area
Impervious area
Rainfall depth
Percent Impervious
SECU - Jacksonville
01517-0048
26-J u I-01
72,100 square feet
54,245 square feet
1.00 inches
75.2 percent
R(v)=0.05+0.009*(Percent impervious)
Runoff coefficient - R(v) 0.73 in/in
Runoff volume=(Design rainfall)*(R(v))*(Drainage area)
Runoff volume 4,368.8 cubic feet
Notes:
Water Quality Pond Calculations 26 July 2001.xis
Runoff Volume Calcs Page 4 of 7 Printed 7/27/01 4:45 PM

Water Quality Pond Volume Calculations
Stage -Storage Data for Pond
Project SECU - Jacksonville
Project No. 01517-0048
Date 26-Jul-01
Contour ID
Stage
Area
[sq. ft.]
Area
[acres]
Incremental
Area
[sq. ft.]
Incremental
Area
[acres]
Incremental
volume
[cu. ft]
Incremental
volume
[acre-ft]
Cumulative
volume
[cu. ft]
Cumulative
volume
[acre-ft]
35
0
24.0
0.001
24.0
0.0
0.0
0.0
0.0
0.0
36
1
174.0
0.004
-150.0
0.0
99.0
0.0
99.0
0.0
37
2
395.0
0.009
221.0
0.0
284.5
0.0
383.5
0.0
38
3
685.0
0.016
290.0
0.0
540.0
0.0
923.5
0.0
39
4
1,042.0
0.024
357.0
0.0
863.5
0.0
1,787.0
0.0
40
5
2,452.0
0.056
1,410.0
0.0
1,747.0
0.0
3,534.0
0.1
40.25
5.25
2,754.0
0.063
302.0
0.0
650.8
0.0
4,184.8
0.1
41
6
3,235.0
0.074
481.0
0.0
2,245.9
0.1
6,430.6
0.1 "
42
7
3,929.0
0.090
694.0
0.0
3,582.0
0.1
10,012.6
0.1
43
8
4,683.0
0.108
754.0
0.0
4,306.0
0.1
14,318.6
0.2
Water Quality Pond Calculations 26 July 2001.xis
Pond Stage -Storage Data Page 5 of 7 Printed 7/27/01 4:45 PM

Water Quality Basin Dewatering Time Calculations
Project SECU - Jacksonville
Project No. 01517-0048
Date 26-Jul-01
Runoff volume required for storage
5,728
cubic feet
Maximum water surface elevation
42.00
feet
Normal pool elevation
40.25
feet
Maximum head of water above dewatering hole
1.72
feet
Orifice coefficient
0.60
Diameter of each hole
0.75
inches
Number of holes
1
Cross sectional area of each hole =
0.003
square feet
Cross sectional area of each hole =
0.4
square inches
Total cross sectional area of dewatering hole(s) =
0.003
square feet
Total cross sectional area of dewatering hole(s) =
0.4
square inches
Flowrate through orifice
0.02
cfs
Time to discharge design volume
Time to discharge design volume
Time to discharge design volume
Notes:
1. Calculations based on orifice equation.
295768.9
seconds
82.2
hours
3.4
days
Water Quality Pond Calculations 26 July 2001.xis
Basin Dewatering Page 6 of 7 Printed 7/27/01 4:45 PM

Water Quality Pond Summary Information
Project
SECU - Jacksonville
Project No.
01517-0048
Date
26-Jul-01
Drainage area to pond
Impervious area in drainage area
Bottom of pond elevation
Normal pool elevation
Pond volume at normal pool
Required volume for design rainfall
Required surface area for pond
72,100
square feet = 1.66 acres
54,245
square feet = 1.25 acres
35.00
feet
40.25
feet
4,185
cubic feet
4,369
cubic feet
2,700
square feet
Volume provided for storage of design rainfall =
5,828 cubic feet at elevation 42
Surface area provided at normal pool 2,754 square feet
Water Quality Pond Calculations 26 July 2001.xis
Summary Data Page 7 of 7
Printed 7/27/01 4:45 PM

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number !->W Q> c1D0att and its issue date (if known)_JL1PC5 1 k`tc.,
3. Specify the type of project (check one):
Low Density K High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
�CAMA Major _Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
I. 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.
1 ! 1.ta S-rb 2w,L4 y a. r.i u St uk KE Lo WN sm ta)o
11rd2 RJa .�o,an� �l.�,G rsi F��'C�iL � Cy' Ww— ►t ���,�.�F,_ks
2. Stormwater runoff from this project drains to the i4EV-( River basin.
3. Total Project Area: 1 acres
5. How many drainage areas does the project have? Z
4. Project Built Upon Area: $3 %
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 format as below.
Basiri'Iri%rmation �f+`, `�' .A QW
Ar�xi,Sw- ,�»��f :iX V s,
.7A' '=Drainage Aiea�1 " ¢,�� ` Sl�
r. l_i` ese�'r9 {.. «:�fys%,,:. a",. .ti.'�la✓. '�: c s �� .rd.17C�
� , '`4�a,` Drainage Area 2a 6 �`
,-��. so�i+l S Spa. raaLil:_. .._. :,a�Yr,74.:�5x.i>,Y!F it�!3� Sk*'. �.&'.�.4
Receiving Stream Name
Receiving Stream Class
Drainage Area
64 '860 Fri'
I o, `iz 5 FT x`
Existing Impervious* Area
44, 8ri rem
sst> ram`
Proposed Impervious -Area
54 ZA is l'l
1- a vo '
% Impervious* Area (total)
83• boo
- -6. b %
FImpe�ryious SurfaceArearDrainager7l°real�x;Tr,"ADrainageArea2r>,:
On -site Buildings
413C�fl FT
o
On -site Streets
44, S i FT'
On -site Parking
d
On -site Sidewalks
2 V o IT'L-1
44D Fr 7'
Other on -site
0
p
Off -site
d
a
Total: 54, Z45 F-I.7—
Total:917 IL
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
� (2
Form SWU-101 Version 3.99 Page 2 of 4

v
v MCKIN4&CREED
Jul - y 27, 20Q1 Q1517 0048.QR
Ms. Linda Lewis
NCDENR
Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405
RECEIVED
RE: Request for Additional Information JUL 3 0 2001
Stormwater Project No. SW8 010517 DwQ
SECU Jacksonville PEUd #
Onslow County
Dear Ms. Lewis:
McKim & Creed has received your Request for Additional Information dated July 23,
2001 for the above referenced project. Your comments and our responses are
summarized below.
Comment 1
Please provide the name of the receiving stream. Due to liability concerns, I am unable
to provide this information for you. All I can provide is the classification, however, it
appears that this may drain to Elizabeth Lake or Mill Creek. Please verify.
Response
The name and classification of the receiving stream have been added to page 2 of Form
SW-101.
Comment 2
The Division has issued a new project number rather than modify the old one.
Response
The Division's new project number will be included in this and all future. correspondence.
Comment 3
All built -upon area, existing and proposed, must be, directed into the pond prior to
discharging through the vegetated filter. It appears from the proposed plans that over
7,000 square feet of new built -upon area is graded such that the runoff will bypass the
pond. This is not acceptable and must be revised. The original 1990 approved plans
appeared -to allow about 2,100 square feet to bypass the pond. That would be
unacceptable under today's rules, however, since that area is not proposed to be
revised, I will not require it to be collected. Please redirect the proposed curb cut that
currently drains into the filter into the forebay of the pond. Due to this requirement, the
drainage area to the pond will increase. This increase may result in a deficient surface
area.
Response
The area previously draining to the vegetated filter has been collected by'a curb inlet
and directed into the forebay of the pond. In the previous calculations, the impervious
5625 DILLARD DR., SUITE 117, CARY, NORTH CAROLINA 27511
TEL [phone] FAX [phone] www.mckimcreed.com
AA0002667
Wyk

Ms. Linda Lewis
SECU-Jacksonville
Request for Additional Information
July 27, 2001
Page 2
area draining to the vegetated filter was included in the impervious area total, but not in
the drainage area tabulation, thus creating a conservatively large pond area. Therefore,
this 7,000 +/- square feet has not increased the total impervious drainage area, and has
decreased the impervious percentage. The result is a surface area requirement almost
exactly the same as indicated by the previous calculations. The pond as previously
designed is adequately sized for this 7,000 +/- square feet and its resulting new
impervious percentage.
Comment 4
The top of the rise structure is noted as 42, however, the supplement indicates that the
temporary storage elevation is 42.6. Please correct the supplement to 42 or revise the
top of the riser to 42.6 and submit revised documents as required.
Response
The correct temporary storage elevation is 42. This has been revised on page 1 of Form
SW-102.
Comment 5
Please provide a vegetated filter detail. Indicate the type of flow spreader mechanism,
all elevations, slopes and inverts, and the type of grass that exists, or is to be planted in
the filter.
Response
A detail of the existing vegetated filter is shown on Sheet LA-4. The flow spreader
mechanism, elevations, slopes and inverts of the outlet structure and vegetated. filter are
specified on Sheet LA-4.
Comment 6
Please accurately report the temporary pool volume. This pond does not provide 8,524
cubic feet of storage between elevation 40.25 and 42.
Response
The revised temporary pool volume has been shown on page 1 of Form SW-102.
Comment 7
The owner's name and title were not provided in Section I, Part 2 or in Section VII. I
have taken the liberty of adding. If what I have added is incorrect, please revise.
Response
The name added is correct and does not need to be revised.
� �xxKIM&c7tEEv

Ms. Linda Lewis
SECU-Jacksonville
Request for Additional Information
July 27, 2001
Page 3
Comment 8
Please either delineate all wetlands on site, disturbed or undisturbed, or note on the
plans that none exist.
Response
A note regarding the wetlands has been added to Sheet LA-1.
Please do not hesitate to contact me if you have any questions or need any additional
information.
Respectfully,
McKIM & CREED, P.A.
Jonat P. Eakins, PE
Project Engineer
Attachments: 2 Sets of revised drawings
1 set of revised calculations
Revised forms SW-101 and SW-102
46
4t7,4-*A
Z::,�MCKM&CREED

North Carolina
Department of Environment and Natural Resources
Division of Water Qualih7
Wilmington Regional Office.
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Mr. R. S. Hall, Sr. Executive Vice President
NC State Employee's Credit Union
1000 Wade Avenue
Raleigh, NC 27605
Subject
Dear Mr. Hail:
.luly 2'). 2001
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 010717
SECU Jacksonville
Onslow County
The Wilmington Regional Office received a modification to the Stormwater Management Permit
Application for SECU .Jacksonville on May 15, 2001. A preliminary review of that information has determined
that the application is not complete. The following information is needed to continue the stormwater review:
Please provide the name of the receiving stream. Due to liability concerns, I am unable to
provide this information for y6u. All 1 can provide is the classification, however, it appears from
the USGS map that this may drain to Elizabeth Lake or Mill Creek. Please verify.
2. The Division has issued a new project number rather than modify the old one.
All built -upon area, existing and proposed, must be directed into the pond prior to discharging
through tite vegetated filter. It appears from the proposed plans that over 7,000 square feet of
new built -upon area 1s graded such that the runoff will bypass the pond. This is not acceptable
and must be revised. The original 1990 approved plans appeared to allow about 2,100 square feet
to bypass the pond. That would not be acceptable under today's rules, however, since that area is
not proposed to be revised, I will not require it to be collected. Please redirect the proposed curb
cut that currently drains into the filter, into the forebay of the pond. Due to this requirement, the
drainage area to the pond will increase. This increase may result in a deficient surface area.
4. The top of the riser structure is noted as 42, however, the supplement indicates that the temporary
storage elevation is 42.6. Please correct the supplement to 42, or revise the top of the riser to
42.6,. and submit revised documents as required.
Please provide a vegetated filter- detail. Indicate the type of flow spreader mechanism, all
elevations, slopes and inverts, and tile type of grass that exists, or is to be planted in the filter.
Please accurately report the temporary pool volume. This pond does not provide 8,524 cubic feet
of stora'ie between elevation 40.25 and 42.
127 Cardinal Dr. Exi., Wilmington, North Carotin;: 2840i 'telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer S0'%, recycied/10% post -consumer paper

Mr. Hall
.July 23. 2001
Stormwater Project No. SIWS 010517
----------------------------------------------
7. The owners name and title were not provided in Section 1, Bart 2 or in Section VII. I have taken
the liberty of adding. If what l have added is incorrect, please revise.
8. Please either delineate all wetlands on site, disturbed or undisturbed, or note on the plans that
none exist.
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 August 23, 2001, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the
application fee.
If you need additional time to submit the information, please mail or fax your request for a time
extension to the Division at the address and fax number at the bottom of this letter. The request must indicate
the date by which you expect to submit the required information. 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.
Please reference the State assigned project number on all correspondence. Any original documents that
need to be revised have been sent to the engineer or agent. All original documents must be returned or new
originals must be provided. Copies are not acceptable. if you have any questions concerning this matter please
feel free to call me at [phone]. _
Sincerely,
Linda Lewis
Environmental Engineer
RSS/arl: S:IWQSISTOIWMIATIADDINF01010517.JUL
cc: Linda Lewis
.Jonathan Eakins, P.E.
127 Cardinal Dr. Ext., Wilmington. North Carolina 28405 'Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50%, recycled/10% post -consumer naper

OFFTCE•USDONI:Y"r
w a`:.�:�;,-",'.�`
Date Received
Fee Paid
Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
5: fell , fir. Ex. vice f re 5/0/e.'7f
3. Mailing Address for person listed in item 2 above:
IO D 1[S hYJ� 1ti.au_
City: &m—Q. State!_ c Zip: Za- ioo 5
Telephone Number: `t -� '83Ck- 5ocn - -
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
5. Location of Project (street address):
City: County: DtAl L n( _.... _ .,.
6. Directions to project (from nearest major intersection)'.
S �E S �.P �' �1 ►-�fisi>~L�., Sga r' Soar14- Sa to ST DT l�r QS�(sr►v ni
Dle 9i_u 0 Gt +�.+3s�o rJ DaEi-T-
7. Latitude:k! - 4� t k — -- Longitude: W Za of project
8. Contact person who can answer questions about the project:
Name: �NC� a►� EkkL'r-» Telephone Number:
II. PERMIT INFORMATION:
1. Specify whether project is (check one): New Renewal Modification
Form SWU-101 Version 399 Page 1 of 4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number 5 V.t_q> `ty o Raj and its issue date (if known) u EC 5 1 l zi�
Specify the type of project (check one):
Low Density X High Density Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major _Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. 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.
l 1� Sra 2r.1.1lsi'G2 [2y t.l u F _ L� "t4aL . St iE. \.6 u_ K E tow m e
Al�fL NIX Vow x), \.LF_GE:Vr i �: a)p. L f'F� .,. 1k C �_ a LL. RF
-1b t Nta C,
2. Stormwater runoff from this project drains to the 4��4t - River basin.
3. Total Project Area: 1- 4-1 acres
5. How many drainage areas does the project have? 'L
4. Project Built Upon Area: '83 • L %
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 format as below.
Bann Informations ; < Asa F�
.b:•-"x a -t r•r as._ s�. : t..-
Diaina a real= ' , r r-
g i/1 1�Drainage
. r�s;,: x r.zt�aax 1tn
Area 2Z�,
irk k.� tar�,.._i�.a.:; E _ a c_
Receiving Stream Name
Receiving Stream Class
Drainage Area
(.4 51,0 Fri
10, 5Z S Fr
Existing Impervious* Area
44 $ -iYr2
Z S Sb 1�-�
Proposed Impervious*Area
54 Zed 5i 'kff
to F0,
%Impervious" Area (total)
$3• 6101a
1-0• b 2'/u
tk k a
Irnperviaus,SurfaceArea
e�AreaSU_7
�""�.;.r,...a..s.M .�,
J mina e area 2' `� s
On -site Buildings
- -" — "�-�3�Q "'- -
o
On -site Streets
44,
On -site Parking
0
p
On -site Sidewalks
2 4 V FT Z-
4 4 D Fr Z
Other on -site
p
p
Off -site
CJ
p
Total: G4, 745 p T �
Total: ( Q
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

How was the off -site impervious area listed above derived? U�C�I'RZC—D to aJ��pD
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable'state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone].for the status
and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104_.. _
Low Density Supplement __.....
Form SWU-15
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
Form SWU- l01 Version 3.99 Page 3 of 4

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
I. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original and one copy of the Stormwater Management Permit Application Form —It
• One copy of the applicable Supplement Form(s) for each BMP
• Permit application processing fee of $420 (payable to NCDENR)
• Detailed narrative description of stormwater treatment/management
• Two copies of plans and specifications, including:
- Development/Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist
- Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you .wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm): K S t&Z�Cp
Mailing Address: 962s Dtt4xkg1U p&k tFe
City: C&tt. State: W c_ Zip:
Phone: ( 'it Fax: (_'l t �l BD 3 i
VHI. APPLICANT'S CERTIFICATION
I, (print or type name ofperson listed in General Information, item 2)
certify .hat the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the ropo ed project complies with the requirements of 15A
NCAC 2H .1000. /
Signature:
Date:
Form SWU-101 Version 3.99 Page 4 of 4

Ex-i srLN� Permit No. S g "\,0V4,L
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWQ Storrnwater Management Plan Review:_
A complete storrawater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
structure details.
I. PROJECT INFORMATION
Project Name: —
Contact Person: ��N,,rf G4�r ;►.�s Prone Number: `'1 l5
For projects with multiple basins, specify which basin this worksheet applies to:
elevations
Basin Bottom Elevation -SS.a ft.
Permanent Pool Elevation 4p . LS . ft.
Temporary Pool Elevation 4z- I. b ft.
(floor of the basin)
(elevation of the orifice)
(elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area Z_4SA- sq. ft. (water surface area at the orifice elevation)
Drainage Area 1 4 ac. (on -site and off -site. drainage to the basin)
Impervious Area ac. (on -site and off -site drainage to the basin)
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebay Volume
Other parameters
SAIDA 1
Diameter of Orifice
Design Rainfall
Design TSS Removal 2
4tIBS _ cu. ft. (combined volume of main basin and forebay)
155Z4 cu. ft. (volume detained-above:the permanent pool)
'gam cu. ft. (approximately 20% of total volume)
(surface area to drainage area ratio from DWQ table)
DES in. (2 to S day temporary pool draw -down required)
1 in.
'$S % (minimum 85% required)
Form SWU-102 Rev 3.99 Page 1 of 4

Footnotes:
When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the
actual impervious To and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR $MP manual provides design tables for both 85% TSS removal and 90% TSS removal.
II. REQUIRED ITEMS -CI ECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H :1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
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. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in'2 to 5 days.
T e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow
calculations)
_-
f. The basin length to width, ratio is greater than 3:1.
g. The basin side slopes above the permanent pool are no steeper than 3:1.
h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
i. Vegetative cover above the permanent pool elevation is specified.
j. A -trash rack or similar device is provided for both the overflow and orifice.
'k. A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
1. If. -the basin is used -for sediment and erosion control during construction, clean out of the
.basin is specified prior to use as a wet detention basin.
_ . f m. A mechanism is specified which will drain the basin for maintenance or an emergency. -
4 = S GCil.rt.ATrtLE
III. WET 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.
This system (check one) does 0 does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does Pdoes not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Page 2 of 4

Maintenance activities shall be performed as follows:
1. Afterevery significant runoff producing rainfall event and at least monthly;
a. Inspect the wet detention basin 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 be handled in a manner that will not 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 readily penetrate into accumulated sediments.
When the permanent pool depth reads 36•3u feet in the main pond, the sediment shall be removed.
When the permanent pool depth reads feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
17 Permanent Pool Elevation 40•75
SedimentRe oval El.80 r,,\Sediment Removal Elevation 3b' 3 V 75%
Bo[tom Ele anon--------------------------------------------- --------
Bottom Elevation un 25%
TOREBAY 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 practical.
Farm 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
chances to the system or responsible party.
Print name:._. - _ �✓� ! .__-- . - —.
Title: 57'p Yi
Address: O O?O Alt.
PhnP• nr7 ] J — 1 ) O
Signature:
VP v C e e s;
e
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.
I, Fi L° r' , a Notary Public for the State of 1 ui
County of ✓ A-0 iL. j i , do hereby, certify that
personally appeared before me this � . day of Ma t/ G �� , and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my band and official seal,
SEAL
.- My commission expires
Form SWU-1Q2 Rev 3.99 Page 4 of 4

r
t�
STORMWATER
CALCULATIONS
State Employees' Credit Union
Jacksonville, Onslow County, North Carolina
Prepared for:
State Employees' Credit Union
c/o O'Brien Atkins Architects
PO BOX 12037
RTP, NC 27709
[phone]
Date:56 Mpx 7, 2001
t,t�11dI'
SEAT ;
61 2 —
,0 GIN���°�� �1�k
RECEIVED
Prepared by:
McKim & Creed
5625 Dillard Drive
Suite 117
Cary, NC 27511
MAY 15 2001
DWQ
PROD # SW 900 cSl

DESIGN NARRATIVE
1. GENERAL
The project site is located at 100 Western Boulevard Extension, in the city of
Jacksonville, within Onslow County, North Carolina. The project site is 2.23 acres.
Sedimentation and Erosion control measures are not required for this project since the
disturbed area is less than 1 acre. However, sediment and erosion control measures
will be implemented to avoid excessive discharge of sediment into downstream waters.
The intent of this project is to expand the existing State Employees Credit Union
building at the site, and add a remote drive -up facility and required parking and drive
areas to support the expansion and new construction.
2. EXISTING SITE
The existing site is currently developed and used by the North Carolina State
Employees Credit Union. The existing development includes a one-story building and
drive and parking areas to support the existing development.
There are two entrances to the site. One entrance is from Western Boulevard
Extension on the southeast corner of the site, and the other is from Moosehaven Road
on the northwestern corner of the site.
A manmade drainage swale flows generally from east to west across the northern
property boundary. There is a 20 foot drainage and utility easement associated with
this drainage swale.
The site has an existing stormwater collection system that collects surface water runoff
and discharges it to an existing stormwater quality pond. There is an existing 30 foot
long vegetated filter downstream of the pond. The existing water quality pond is
approximately 75 feet long and approximately 40 feet wide.
Under existing topographic conditions, a portion of the existing driveway to the site from
Moosehaven Road does not drain into the pond or into the vegetated swale. The
dimension of this area is approximately 110 feet long and 30 feet wide.
3. PROPOSED IMPROVEMENTS
Most of the stormwater runoff from the proposed improvements will be collected in the
existing curb inlets in the parking lot and drive areas and be discharged to the
stormwater detention pond. The existing vegetated filter will remain downstream of the
pond.

A portion of the stormwater runoff from the proposed development will flow through a
curb cut into the vegetated filter downstream of the pond. Under existing conditions,
the only area currently draining to the pond that is proposed to be diverted into the
vegetated swale is undeveloped.
The intent of the design for this water quality pond was to utilize the existing stormwater
infrastructure, and the existing pond size and location. The pond was designed to
maintain the existing surface area, since the pond was constructed slightly larger than
was required under the previous design, and would provide the required surface area
for the SAMA ratio for the new development. Since the NC DENR office reviewing this
project would likely have recommended that the pond be cleaned out to the original
pond design depth as part of construction, the pond was "re -graded" to insure that the
grades above and below the normal pool elevation are 3H:1V and that the volume of
the forebay is adequate. In addition, the regrading of the pond included a 6:1 planting
shelf which the pond does not currently have.
The existing pond as constructed does not meet the 3L:1W flow path requirement.
However, it could not be improved to the 3:1 requirement because the location of the
existing storm sewer and vegetated filter limit the length of the pond, and the required
surface area and storage volume caused the width of the pond to increase so that the
length -to -width ratio would be less than 3:1.
The detention pond and vegetated filter will provide storm water treatment from the
proposed improvements. The detention pond has been sized to store and gradually
release runoff from 1 inch of rainfall at the site. The surface area of the permanent
water quality pool is 2,754 square feet. The temporary water quality pool will store
4,339 cubic feet of water to be released in a period of two to five days. One forebay is
located at the outlet of the storm sewer system and represents 20% of the pond's
volume. The spillway system will consist of a riser -barrel structure with a 0.75 inch hole
in the riser structure. A 12 inch RCP will drain by gravity to the vegetated filter
downstream of the pond. The spillway will pass the 25-year storm without overtopping
the pond.
4. DRAINAGE CALCULATIONS
A complete set of calculations for outlet protection, water quality detention pond, and
drainage ditch velocities is attached.

WATER QUALITY POND CALCULATIONS
Project Name
SECU - Jacksonville
Project Number
01517-0048
Date
07-May-01
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3rd revision
2nd revision
1st revision

Water Quality Pond Drainage Area Data
Project SECU - Jacksonville
Project No. 01517-0048
Date 7-May-01
Total site area 96,939 square feet = 2.23 acres
Impervious areas
Drainage
area to pond IOther
Drainage Area
Existing
[sf)
Proposed
[sf]
Change
[sf]
Existing
[sf]
Proposed
[sf]
On -site buildings
4,664
7,300
2,636
0
0
On -site streets
0
0
0
0
0
On -site parking
37,895
44,185
6,290
0
7,250
On -site sidewalks
2,340
2,760
420
0
460
Other on -site
0
0
0
0
0
Total off -site impervious
0
0
0
0
0
Total Impervious
44,899
54,245
9,346
0
t 7,710
Non -impervious areas
Drainage area to pond
Other Drainage Area
Existing
[sf)
Proposed
[sf]
Change
[sf]
Existing
[sf]
Proposed
[sf)
On -site grass/landscape
22,441
10,615
-11,826
4,275
3,215
On -site woods
0
0
0
0
0
Other undeveloped
0
0
0
0
0
Total off -site non -impervious
0
0
0
0
0
Total non -impervious
22,441
1 10,615
-11,826
4,275
3,215
Total Drainage Area
67,340
64,860
-2,480
4,275
10,925
Percent Impervious
66.7
83.6
0.0
70.6
Notes:
1. The areas noted in the existing conditions column are based on a survey of the site. These values may differ from
the permitted values/areas.
2. The drainage area to the pond has become smaller because some existing area that currently drains to the pond is
being diverted into the vegetated filter.
3. The "Other" Drainage Area currently does not drain to the pond. It either drains to the vegetated filter or to the
storm sewer along Moosehaven Road.
4. The site is currently permitted for 53,876 square feet of impervious area and 80.4% impervious.
Water Quality Pond Calculations 07 May 2001.xis
Site Drainage Area Data Page 2 of 7 Printed 5/7/01 10:44 AM

Water Quality Pond Surface Area Calculations
Project SECU - Jacksonville
Project No. 01517-0048
Date 7-May-01
Total drainage area to pond 64,860 square feet
Total impervious area in drainage area 54,245 square feet
Water depth of basin at normal pool
Location of site
Site region
% Impervious cover
Jacksonville, NC
Coastal
83.6 percent
5.25 feet
IN
If the site is in a coastal area, will a vegetative filter be used? l�
Surface Area/Drainage Area Ratios:
For a site in the Piedmont 2.4 percent
For a site in a Coastal County wl Vegetative Filter 4.2 percent
For a site in a Coastal County Wout Vegetative Filter 5.7 percent
Required surface area of pond:
For a site in the Piedmont 1,570.0 square feet
For a site in a Coastal County wl Vegetative Filter 2,710.0 square feet
For a site in a Coastal County wlout Vegetative Filter 3,700.0 square feet
Notes:
1. The site has an existing Vegetative Filter downstream of the pond that will be used.
Water Quality Pond Calculations 07 May 2001.xls
Pond Surface Area Calcs Page 3 of 7 Printed 517101 10:44 AM

Water Quality Pond Stormwater Runoff Volume Calculations
Project SECU - Jacksonville
Project No. 01517-0048
Date 7-May-01
Drainage area
64,860 square feet
Impervious area
54,245 square feet
Rainfall depth
1.00 inches
Percent Impervious
83.6 percent
R(v)=0.05+0.009*(Percent impervious)
Runoff coefficient - R(v) 0.80 in/in
Runoff volume=(Design rainfall)*(R(v))*(Drainage area)
Runoff volume 4,338.6 cubic feet
Notes:
Water Quality Pond Calculations 07 May 2001.xis
Runoff Volume Calcs Page 4 of 7 Printed 517/01 10:44 AM

Water Quality Pond Volume Calculations
Stage -Storage Data for Pond
Project SECU - Jacksonville
Project No. 01517-0048
Date 07-May-01
Contour ID
Stage
Area
[sq. ft.]
Area
[acres]
Incremental
Area
[sq. ft.]
Incremental
Area
[acres]
Incremental
volume
[cu. ft]
Incremental
volume
[acre-ft]
Cumulative
volume
[cu. ft]
Cumulative
volume
[acre-ft]
35
0
24.0
0.001
24.0
0.0
0.0
0.0
0.0
0.0
36
1
174.0
0.004
150.0
0.0
99.0
0.0
99.0
0.0
37
2
395.0
0.009
221.0
0.0
284.5
0.0
383.5
0.0
.38
3
685.0
'0.016
290.0
0.0
540.0
0.0
923.5
0.0
39
4
1,042.0
0.024
357.0
0.0
863.5
0.0
1,787.0
0.0
40
5
2,452.0
0.056
1,410.0
0.0
1,747.0
0.0
3,534.0
0.1
40.25
5.25
2,754.0
0.063
302.0
0.0
650.8
0.0
4,184.8
0.1
41
6
3,235.0
0.074
481.0
0.0
2,245.9
0.1
6,430.6
0.1
42
7
3,929.0
0.090
694.0
0.0
3,582.0
0.1
10,012.6
0.1
43
8
4,683.0
0.108
754.0
0.0
4,306.0
0.1
14,318.6
0.2
Water Quality Pond Calculations 07 May 2001.xls
Pond Stage -Storage Data Page 5 of 7 Printed 5/7/01 10:44 AM

Water Quality Basin Dewatering Time Calculations
Project SECU - Jacksonville
Project No. 01517-0048.
Date 07-May-01
Runoff volume required for storage
4,339
cubic feet
Maximum water surface elevation
42.60
feet
Normal pool elevation
40.25
feet
Maximum head of water above dewatering hole
2.32
feet
Orifice coefficient
0.60
Diameter of each hole
0.75
inches
Number of holes
1
Cross sectional area of each hole =
0.003
square feet
Cross sectional area of each hole =
0.4
square inches
Total cross sectional area of dewatering hole(s) =
0.003
square feet
Total cross sectional area of dewatering hole(s) =
0.4
square inches
Flowrate through orifice
0.02
cfs
Time to discharge design volume
192877.3
seconds
Time to discharge design volume
53.6
hours
Time to discharge design volume
2.2
days
Notes:
1. Calculations based on orifice equation.
Water Quality Pond Calculations 07 May 2001.xis
Basin Dewatering Page 6 of 7 Printed 517101 10:44 AM

Water Quality Pond Summary Information
Project SECU - Jacksonville
Project No. 01517-0048-
Date 7-May-01
Drainage area to pond
64,860
square feet = 1.49 acres
Impervious area in drainage area
54,245
square feet = 1.25 acres
Bottom of pond elevation
35.00
feet
Normal pool elevation
40.25
feet
Pond volume at normal pool
4,185
cubic feet
Required volume for design rainfall
4,339
cubic feet _*
Required surface area for pond
2,710
square feet
Volume provided for storage of design rainfall = 4,339 cubic feet at elevation 42.6
Surface area provided at normal pool 2,754 square feet
Water Quality Pond Calculations 07 May 2001.xls
Summary Data Page 7 of 7 Printed 517101 10:44 AM

vIvKIQM£rCREED
TO: NCDENR
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
ATTENTION: Scott Vinson
LETTER OF TRANSMITTAL
DATE: May 14, 2001
PROJECT N0: 1 517-0048
TASK NO:
RE: SECU — Jacksonville
Water Quality Pond
TRANSMITTAL NO:
PAGE 1 OF 1
WE ARE SENDING: [:]Originals ❑ Prints ❑ Shop Drawings ❑ Samples
❑ Specifications ❑ Calculations ❑ Other -
Quantity
Drawing No.
Rev.
Description
Status
1
Stormwater Management Permit Application Form (Original)
1
Stormwater Management Permit Application Form (Copy)
1
Wet Detention Basin Supplement
1
Narrative Description of Water Quality Pond
1
Permit Application Processing Fee of $420.00
1
Set of Calculations
2
Sets of Plans
Issue Status Code:
Action Status Code
REMARKS:
A. Preliminary B. Fabrication Only C. For Information D. Bid
E. Construction F. For Review & Comments G. For Approval H. See Remarks
1, No Exceptions Taken 2. Make Corrections Noted 3. Other
4. Amend & Resubmit 5. Rejected - See Remarks
cc: File — Transmittal only
MAY 15 2001
iawQ
IMoa #
5625 DILLARD ROAD, SUITE 117, CARY, NC 27511 9191233.8091 33-8031
McKIM & CREED ENGINEERS, PA
Sig
Jon than P. Eakins, PE
SA151710048110-CommMansmittal SVinson 05-14-01.doc