SW7080921_CURRENT PERMIT_20210414

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW?4R9,t
DOC TYPE
CCURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

WCA i7-c>
ROY COOPER
Governor
DIONNE DELLFGATTI
Secretary
BRIAN WRENN
Director
NORTH CAROLINA
Environmental Quality
April 14, 2021
State Employees' Credit Union
Attention: Jonathan Crane, SVP. Facilities Services
P.O. Box 26807
Raleigh, NC 27611
Subject: Stormwater Permit No. SW7080921 Renewal
SECU - Plymouth, NC
High Density Project
Washington County
Dear Mr. Crane:
The Washington Regional Office received a Stormwater Management Permit
Application for renewal of the subject permit on March 19, 2021. Staff review of the
application has determined that the permit can be reissued. We are forwarding Permit
No. SW7080921 dated April 14, 2021, for the continued operation of the existing
stormwater system.
This permit, upon its effective date, will replace all previous State Stormwater permits for
this project. This permit shall be effective from December 31, 2021 until December 30,
2029 and shall be subject to the conditions and limitations as specified therein, and does
not supercede any other agency permit that may be required. Please pay special attention
to the Operation and Maintenance requirements in this permit. Failure to establish an
adequate system for operation and maintenance of the stormwater management system
will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you
have the right to request an adjudicatory hearing upon written request within thirty (30)
days following receipt of this permit. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714
Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please
contact me at [phone].
Sincerely,
F° l Roger K. Thorpe
Environmental Engineer
M,_ North Carolina Departmene or Environmental Quality I Divisionof Energy, Mineral and Land Resources
r//)) Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
252.946.6481

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
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
State Employees' Credit Union
SECU - Plymouth
Located at 880 US Highway 64 West, Plymouth, NC
Washington County
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the
provisions of 15A NCAC 2H .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 Energy, Mineral, and
Land Resources (Division) and considered a part of this permit.
This permit shall be effective from December 31, 2021 until December 30, 2029, and
shall be subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit 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 in Section 1.6. of this permit. The stormwater control has
been designed to handle the runoff from 59,570 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated in Section 1.6.
of this permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either
dedicated common areas or recorded easements. The final plats for the project
will be recorded showing all such required easements, in accordance with the
approved plans.
J North Carolina Department of Environmental Quality I Drviston of Energy. Mineral and Land Resources
Lr/ Washington Regional Office J 943 Washington Square Mall I Washington. North Carolina 27889
n���
oepi°"""�°� � "n10u"�� 282.9488481

5. The runoff from all built -upon area within the permitted
drainage area of this
project must be directed into the permitted stormwater
control system.
6. The following design criteria have been provided in the wet detention basin and
must be maintained at design condition:
a. Drainage Area, acres:
2.17
b. Total Impervious Surfaces, ft2:
59,570
C. Pond Depth, feet:,
8.50
d. TSS removal efficiency:
90%
e. Permanent Pool Elevation, FMSL:
12.50
f. Required Permanent Pool Surface Area,
ft2: 6,931
g. Provided Permanent Pool Surface Area,
ft2: 9,934
h. Permanent Pool Volume, ft3:
35,168
i. Temporary Storage Elevation, FMSL:
13.30
j. Required Storage Volume, ft3:
7,292
k. Provided Storage Volume, ft3:
9,261
I. Controlling Orifice:
1.5" O pipe
M. Receiving Stream/River Basin: Conaby
Creek / Roanoke River Basin
n. Stream Index Number:
23-56
o. Classification of Water Body:
"C; Sw"
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety,
vegetated and operational for its intended use prior to the construction of any
built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
3. 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:
North Carolina Department or Environmental Quality � Division of Energy. Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
252.946.6481

a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow
spreader, catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon
request to authorized personnel of the Division. The records will indicate the
date, activity, name of person performing the work and what actions were taken.
5. Decorative spray fountains will be allowed in the stormwater treatment system,
subject to the following criteria:
a. The fountain must draw its water from less than 2' below the permanent
pool surface.
b. Separated units, where the nozzle, pump and intake are connected by
tubing, may be used only if they draw water from the surface in the
deepest part of the pond.
c. The falling water from the fountain must be centered in the pond, away
from the shoreline.
d. The maximum horsepower for a fountain in this pond is 1/8 horsepower.
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. A
modification may be required for those deviations.
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. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
10. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
��� North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional office 1 943 Washington Square Mall I Washington. North Carolina 27889
am""'"°""anWQi'�� 252.946.6481

b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
11. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
12. A copy of the approved plans and specifications shall be maintained on file by
the Permittee at all times.
13. 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.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director.
In the event of a change of ownership, or a name change, the permittee must
submit a formal permit transfer request to the Division, accompanied by a
completed name/ownership change form, 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.
The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
z. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to enforcement action by the Division, 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) having 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.
5. The permittee grants DEQ Staff permission to enter the property during normal
business hours for the purpose of Inspecting all components of the permitted
stormwater management facility.
North Carolina Department of Environmental Quality I Division of Enei gy, Mineral and Land Resources
u c.nrn wa
Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
p°��11ei1py"evu0i'"�y 252.9466481

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.
7. 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.
8. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address
changes within 30 days.
10. This permit shall be effective from December 31, 2021 until December 30,
2029. Application for permit renewal shall be submitted 180 days prior to the
expiration date of this permit and must be accompanied by the processing fee.
Permit issued this the 14 th day of April 2021.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Gam -
Brian Wrenn, Director For
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Permit Number SW7080921
North Carolina Department or Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington. North Carolina 27889
252.946 6481

State Employees' Credit Union
Facilities Services
March 8, 2021
UU MAR 1 -
NC Department of Environmental Quality 9
943 Washington Square Mall By\
Washington, NC 27889
To Whom It May Concern:
Enclosed is the Stormwater Permit Renewal Application Permit Number SW7O8O921 for the
SCM located at:
SECU
880 US Highway 64 West
Plymouth, NC 27962
A Cashiers Check is also enclosed in the amount of $505.00 for the renewal.
Please let me know if you need any additional information.
Sincerely,
John F. Elliott
SECU Facilities Management
919-839-8011
ielliottP,ncsecu.org
SCM Inspection and Maintenance Certification #3025
NCNC STATE
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4401 Creedmoor Road • P.O. Box 26807 • Raleigh, NC 27611-6807 • 919-856-3340
"Equal EmploymenIlA,ffirmative Action Employer, M/F/Disability/heteran"

DEMLR USE ONLY
Date Received
Fee Paid
Permit Number
3 Iq ;I- I!
S�s.do
swr7ogogi
NC DEQ Division of Energy, Mineral and Land Resources
STATE STORMWATER:
PERMIT RENEWAL APPLICATION FORM
In accordance with 15A NCAC 2H.1045(3), the current permit holders # JWD4titir�i�c(r� ppp permit 180 days
prior to its expiration. Renewed permits are valid fora period of 8 yea er Session Law 2 1 p 8 (SB 781)
Section 60.(c). This application form is for permit renewals only. MAR 19 2021 II
A. PROJECT INFORMATION
1. State Stormwater Permit Number: S W7080921
2. Project name: STATE EMPLOYEES' CREDIT UNION PLYMOUTH - EXPRESS
3. Project street address: 880 US HIGHWAY 64 WEST
City: PLYMOUTH County: WASHINGTON
ZIP: 27962
4. What, if any, changes have been made to the project as permitted? NONE
If the project has changed from the original approved plans, please complete SWU-101 for a Major
Modification or Minor Modification Application form available at: https://deg.nc.gov/about/divsions/energv-
mineral-la nd-resources/energy-mineral-land-rules/stormwater-grogram/post-construction.
B. PERMITTEE INFORMATION
If changes to the permittee or project name have been made, please complete either the Permit Update form
or the Permit Transfer form available at: https://deg.nc.gov/about/divisions/energy-mineral-land-
resources/energy-mineral-land-rules/stormwater-program/post-construction State StormwaterPermits do not
automatically transfer with the sale of the property.
1. Current Permit Holder's Company Name/Organization: STATE EMPLOYEES' CREDIT UNION
2. Signing Official's Name: JONATHAN CRANE
3. Signing Official's Title: SVP FACILITIES SERVICES
4. Mailing Address P.O BOX 26807
City: RALEIGH
5. Street Address: 4401 CREEDMOOR ROAD
NC ZIP : 27611
City: RALEIGH State: NC ZIP: 27612
6. Phone: [phone] Email: FACILITIESSERVICES(a)NCSECU.ORG
Stormwater Permit Renewal Form Page 1 of 3 May 11, 2018

k �
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:Jtl j ,�'
,I t`V' � � 14 i

C. SUBMITTAL REQUIREMENTS
Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR
Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQW/ORW). Only applications packages that
include all required items listed below will be accepted and reviewed.
Initial each item below to indicate that the required information is provided in the application package:
JC 1 A permit application processing fee of $505.00 payable to NCDEQ.
JC 2. One original signed hard copy and one electronic copy of this completed form. The signing official
named on this application to represent the current permittee must meet one of the following:
a. Corporation — a principle executive officer of at least the level of vice-president;
b. Limited Liability Company (LLC) — a manager or company official as those terms are defined
in G.S. 57D "North Carolina Limited Liability Company Act;"
c. Public Entity — a principal executive officer, ranking official, or other duly authorized employee,
d. Partnership or limited partnership — the general partner;
e. Sole proprietor; or
f. Letter of authorization signed by one of the signatories noted in a — e above authorizing the
signature of another entity.
JC 3. One hard copy and one electronic copy of recorded documents required by the original permit that have
not yet been received by DEMLR, including: deed restrictions, protective covenants,
condominium/planned community declaration and easements. If the project has been built, include
documentation that the maximum BUA per lot or maximum total BUA has not been exceeded. If
the project has not been built, include a signed agreement that the final recorded deed restrictions
and protective covenants will be submitted at a later date.
JC 4 O&M Agreements, Please select one:
❑ I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to
keep this on file with the permit; or
® 1 do not have a copy of the current recorded O&M Agreement for all SCMs and am
requesting a copy be sent to me. I agree to keep this on file with the permit.
JC 5 Designer Certifications, Please select one
® A copy of the certification(s) confirming that the project was built in accordance with the
approved plans have been previously provided to the Division; or
❑ A copy of the certification(s) confirming that the project was built in accordance with the
approved plans are enclosed; or
❑ The project has not yet been built.
N/A 6. [IF APPLICABLE] If the project has been built, one original hard copy and one electronic copy of a
signed, sealed, and dated letter from a licensed professional stating that the SCMs have been
inspected, and that they have been built and maintained in accordance with the permit.
N/A 7 [IF APPLICABLE] When the permittee is a corporation or a limited liability corporation (LLC): Provide
one hard copy and one electronic copy of documentation from the NC Secretary of State, or other
official documentation, which supports the titles and positions held by the persons listed in Section
C.2 per 15A NCAC 2H. 1043(3)(b).
https://www.sosnc.gov/online services/search/by title/ Business Registration
Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018

D. PERMITTEE'S CERTIFICATION
I, T N.e J. u [-rcA✓F the person legally responsible for the permit, certify that I have
a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am
responsible for the performance of the maintenance procedures, and the site has been and will be maintained
according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs
or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the
project, SCMs, or ownership. All information provided on this permit renewal application is, to the best of my
knowledge, correct and complete.
Signature. Date: 03/6111z /
NOTARIZATION
I, ...�ose-PH 62Ab cc•r , a Notary Public for the State of
NarerN e_4na. =,,j)3 County of wr4tcc do hereby certify
that A r-H a,a C. A.Jc personally appeared before me
this the t S day of j" LAR4µ 20 Z , and acknowledge the due
execution of the forgoing instrument. Witness my hand and official seal,
(Notary Seal)
Notary Signature: oo
My commission expires 12oZ3
Stonnwater Permit Renewal Application Form Page 3 of 3 May 11, 2018

Permit
(to be provided by DWO)
} W A 7
NCDENR SEP 2 3 2008STORMWATER MANAGEMENT PERMIT APPLICATION FORM o
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
I* PROJECT INFORMATION
Protect name
Contact person
Phone number
Date
Drainage area number
912212008
III. DESIGN:INFORMATION ;
Site Characteristics
/
Drainage area
94, 770.00
ft2 v/
Impervious area
59,570.00
ft'✓✓✓/
% impervious
63 O6
% ✓
Design rainfall depth
Storage Volume: Non -SR Waters
150
in
Minimum volume required
7,29200
ft3
Volume provided
9,261.00
ft'
Storage Volume: SRWaters
1-yr, 24-hr runoff depth
in
Pre -development 1-yr, 24-hr runoff
ft3
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
ft3
Volume provided
ft3
Peak Flow Calculations
(V/A folk S%TE
1-yr, 24-hr rainfall depth
in
Rational C, pre -development
(umtless)
Rational C, post -development
(unitless)
Rainfall intensity. 1-yr, 24-hr storm
/
in/hr
Pre -development 1-yr, 24-hr peak flow
/
ft3/sec
Post -development 1-yr, 24-hr peak flow
ft3/sec
Pre/Post 1-yr, 24-hr peak flow control
ft3/sec
Basin Elevations
Basin bottom elevation
3.00
If
Sediment clean out elevation
Bottom of shelf elevation
400
12.00
It
It
Permanent pool elevation
12.50
It
SHWT elevation
1100
It
Top of shelf elevation
1300
ft
Temporary pool elevation
1330
It
Form SW401-Wet Detention Basin -Rev 4
Parts I. & II Design Summary, Page 1 of 3

"r
Permit No.
-
(to be provided by
1I1. DESIGN INFORMATION , '.- . -
' . ' .. " ,
Volume and Surface Area Calculations
SAtDA ratio
0.07
(unitless)
Surface area at the bottom of shelf
Volume at the bottom of shelf
8,04100
4,49400
it'
it' q
Permanent pool, surface area required
6,93100
vbaJJJr```/
ft2
Permanent pool, surface area provided
9,934.00
ft' OK
V
Permanent pool volume
35,16800
ft"1/
Average depth for SA/DA tables
354
ft OK
Surface area at the top of shelf
12.111.00
ft2
Volume at the top of shelf
5,551.00
ft' LO u" 'rizP oF5VAW
Forebay volume
6,919.00
ft'
Forebay %of permanent pool volume
19.67
% OK
Temporary pool, surface area provided
12.625 00
it'
Drawdown Calculations
/OK
Treatment volume drawdown time
3.66
days
Treatment volume discharge rate
0.03
ft3/s
Pre -development 1-yr, 24-hr discharge
ft3/s
Post -development 1-yr, 24-hr discharge
ft'/s N/q Foy SITE
Additional Information
Diameter of orifice
15
in
Design TSS removal
90
%
Basin side slopes
3.00
:1 OK
Vegetated shelf slope
10.00
:1 OK
Vegetated shelf width
10.00
it OK
Length of flowpath to width ratio
350
1 OK
Length to width ratio
3.00
.1 OK
Trash rack for overflow & orifice?
y
(Y or N) OK
Freeboard provided
1.76
ft OK
Vegetated filter provided?
n
(Y or N) Design must be based on 90% TSS removal
Recorded drainage easement provided?
y
(Y or N) OK
Capures all runoff at ultimate build -out?
y
(Y or N) OK
Drain mechanism for maintenance or emergencies
y:pump required
Form SW401-Wet Detention Basin-Rev.4
Parts 1. & II. Design Summary, Page 2 of 3

Permit
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST.` _
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials Sheet No.
sec 1 Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build -out, C- 1R ez
- Off -site drainage (if applicable), N/A
-Delineated drainage basins (Include Rational C coefficient per basin), CA�C�T tar' roach a Y'
-Basin dimensions, C-t-eca
- Pretreatment system, C- 124j
-High flow bypass system, C - t-2�'A. l C- I-Zo-s
-Maintenance access, c-I-La-2-{ Luot
-Proposed drainage easement and public right of way (ROW), 4/toil C -12o-L
- Overflow device, and C i-Lo l
- Boundaries of drainage easement. L I t o t c- 124-2-
=�f 6 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar, C- 1-.oz.
-Maintenanceaccess, t-/ror I C I
-Permanent pool dimensions, C 1'Lo-6
- Forebay and main pond with hardened emergency spillway, Ct-Le3
- Basin cross-section, Ctzo-4
- Vegetation specification for planting shelf, and L I'jot
-Filter strip. N/FC9oLrse�
3ee� 3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower, CtZo'b
- Pretreatment and treatment areas, and C 1Zo3
-Inlet and outlet structures. C t2o3
SE6 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin. C 17-01
�E.6 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided. � ease-c►1to- tiGTE eaok
sE6 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized. C IZo\
SE6 7. The supporting calculations. - esLco�,rto- r-»E�urt
SE 4 /" A 8. A copy of the signed and notarized operation and maintenance (0&M) agreement
SEA, N /A 9 A copy of the deed restrictions (if required).
SF� 10. A soils report that is based upon an actual field Investigation. soil borings, and infiltration tests County
soil maps are not an acceptable source of soils information.
CA�.CULPThl l�eTE BGOjL
Form SW401-Wet Detention Basm-Rev.4 Part III Required Items Checklist, Page 3 of 3

JACOBS
110 Corning Road
Suite 2500
Cary, North Carolina 27518 USA
1 919.859 5000 Fax 1,919 859 5151
ECIF,II:
Date August 6, 2010
NCDENR — Division of Water Quality AUG 9 2010
Attn: Mr. Samir Dumpor
943 Washington Square Mall
Washington, NC 27889
Re. State Employees' Credit Union — Plymouth Office
NCDENR Permit No SW7080921
Samir
Please find attached for your records a completed Engineer's Certification for the referenced project.
If you need any more information or have any questions, feel free to call me at 919-859-5752 or e-mail me at
Jamie oollinos(5iacobs.com.
Regards,
f' .
Jamie E. Gollings, PE
CC: David Kaiser, OBnen Atkins Associates

State Stormwater Management Systems
Permit No. SW7080921
SECU - Plymouth
Stormwater Permit No. SW7080921
Washington Countv
Designer's Certification
I, JAMXV-- E. Gou-(N6S , as a duly registered ?aOCC-SS40"A . ENG(NEEA in the
State of North Carolina, having been authorized to observe (period/ weekly/ full
time) the construction of the project,
c TrPCTE E1A?Lo`rEES CRea%-r ut--+loa — pLrc AgLsCH OFFICE
(Project)
for STA-m cvxwT un�Ioa (Project Owner) hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the project
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
SEAL
Signature. ()L- £
v
Registration Number 2950k CARo�lii�
Date Ca AQ6 Zolo 0?o ,SS16��2'�
a SEAL
029501 _
Pape 7 of 8

State Stormwater Management Systems
Permit No. SW7080921
Certification Requirements:
1. The drainage area to the system contains approximately the permitted
acreage.
_2. The drainage area to the system contains no more than the permitted
amount of built -upon area. /h?Vg07x+ HArEUr 0, Oz (WZEs OV 1J-%? %noU6
AOpEO CL+E To FIRE Ot4uR r+E.+T LIFE 5AFC" IMPAOVE. -'C g,�p�aE6T5.
✓ 3. All the built -upon area associated with the project is graded such that the
runoff drains to the system.
.% 4. All roof drains are located such that the runoff is directed into the system.
V 5. The outlet/bypass structure elevations are per the approved plan. co.�•�
L-000-"U IDta&=01 4 CM NGOa( 01� Te DSC_K"&C AT AUG.Hr-OF- WAN
6. The outlet structure is located per the approved plans.
J 7. Trash rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
�9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
11. The permitted amounts of surface area and/or volume have been
provided.
✓ 12. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
�14. All required parts of the system are provided, such as a vegetated shelf,
and a forebay.
15. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Washington Regional Office
Washinton County Building Inspections
Panes A of 8

. t'Jg T �^•+T� �'P� �� la 14
i
Permit Number:
SEP 2 3 2008
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
i_;"i`r i W pol t
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
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 ® does not incorporate a vegetated filter at the outlet.
This system (check one):
❑ does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
— Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
— No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
— Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
— If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
— Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf
Best professional practices
Prune according to best professional
show that pruning is needed
practices
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the sediment and
storage depth.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over
Consult a professional to remove
50% of the area.
and control the algal growth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Division of
damage have occurred at the
Water Quality Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
1786.
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 88:5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 5 feet in the forebay, the sediment shall
be removed.
Sediment Removal
Bottom
7_5 I ]
-----------------
BASIN DIAGRAM
(fill in the blanks)
i ft Min.
Sediment
Storage
Permanent Pool Elevation 12.5
Pool
Sediment Removal Elevation 4 Volume
Bottom Elevation 3 1 1-ft
Storage
FOREBAY
MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4

Permit Number:
be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the 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.
Project name: SECU - Plymouth
BMP drainage area number:
Print name:Bobby Hall
Title:Vice - President
Address:1000 Wade Avenue Raleigh, NC 27605
Date: �i/Z r✓�� Si
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.
Qnc�g_R . %S L � - -12 P 5 Notary Public for the State of
�2 i 2�/,n a , County of e. , do hereby certify that
R --.5 b personally appeared before me this
day of s O , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal.
SEAL
My commission expires[ L0i0
Form SW401-Wet Detention Basin O&M-Rev.3 Paoe 4 of 4

oa
' STORMWATER SUBMITTAL REQUIREMENTS
WET DETENTION POND
I. Objective
A. Collect all runoff from all BUA (proposed and/or existing and/or offsite) as the case may be,
by any means including piping or swales, and direct it to the pond.
B. Check the proposed pond design to make sure it meets or exceeds the minimum design
criteria for surface area, volume and drawdown.
it. What makes up a complete wet detention pond application package?
A. Two sets of sealed, signed & dated layout & grading plans with appropriate details.
(Additional sets of plans may be requested for projects in certain counties)
B. Completed application with supplement(s), SWU-101, SW401-Wet Pond, and inspection and
maintenance agreements.
C. Deed restriction document, if applicable (for subdivisions & projects with out parcels)
D. Sealed, signed & dated calculations.
E. Estimated seasonal high water table elevation at all pond locations.
F. Chlorides test results must be provided if the project is within'/2 mile of SR waters (Phase II).
(This is only required to test out of SR water treatment requirements)
III. BIMS entry (for DWQ use only)
Enter & track application acknowledged date, review date, add info requested/received dates, permit
issue dates, and drainage area info. Best done after the add info letter is written and before sending
permit up for signature. ,
IV. Shell documents (for DWQ use only)
Permit shells: s:\wqs\stormwater\shells\highcompond
s:\wqs\stormwater\shells\highsubpond
s:\wqs\stormwater\shells\HDhybrid
Spreadsheet: s:\wqs\stormwater\excel spreadsheets\pond
VI. Review Procedure
A. APPLICATION
v/1. An original si nature is required. Photocopied signatures cannot be accept .
✓2. A complettel wet detention pond supplement and a signed, dated and n rized wet
' /detention pond Inspection and Maintenance Agreement with an original s gnature.
V 3. The numbers on the supplement match up to the numbers used in the calculations and
shown on the plan details.
Built -upon areas are reported in square feet in Section III
5.� Receiving stream name and classification. This is important because in the non -Phase
II counties, a wet pond cannot be used on a project that is within ''/z mile of and draining
to SA waters. For Phase II, a wet pond is allowed within '/z mile of SA waters.
✓6. Section I11.4 is filled in -cannot be left blank. One column must be filled in for each
proposed w t pond.
.� 7. If the applicant is a corporation, partnership or LLC, look it up on the Secretary of State
Corporations Database. Make sure corporation is spelled correctly (capitalization and
punctuation matter) and that the person signing the application is at least a vice-
president in the corporation, a General Partner in the partnership, a member in a
member -managed LLC, or the manager of a manager -managed LLC. Need
documentation to support if the Articles of Incorporation do not list the members or
managers of the LLC. If an agent signs, then a letter of authorization is needed from the
president, vice president, general partner, member or manager.
8�/For subdivided projects, a signed and notarized deed restriction statement must be
provided.
Ttwt eat
Seen Val — 47en7` 4h`4.
b

Wet Detention Pond, cont.
B. CALCULATIONS
�1. The orifice is sized based on drawing down the calculated minimum volume in 2-5
days. The average head to use in the orifice equation is approximately one-third of
the distance between the permanent pool elevation (PPE) and the elevation of the
next available outlet above the permanent pool. The elevation of the next available
outlet must be either the elevation where the minimum volume is provided, or it can
be higher. The temporary pool elevation (TPE) to report on the supplement will be
the elevation of the next available outlet above the PPE. The temporary pool volume
(TPV) to report on the supplement is the volume between the specified PPE and the
TPE.
2J /AFor Phase II projects that are within'/2 mile of and draining to SR waters, the
/( difference in runoff from the predevelopment and post -development conditions for
A� �fhe 1 year 24 hour storm must be controlled and treated.
For Phase II projects, the discharge rate leaving the pond can be no more than the
�pre-development discharge rate for the 1 year 24 hour storm.
AFor Phase II projects draining to SA water, no discharge to surface waters may occur
`from wet ponds. The discharge leaving the orifice must be effectively infiltrated prior to
reaching surface waters.
5. The average pond depth is the permanent pool volume divided by the permanent pool
surface area. The result must be between 3 ft. and 7.5 ft. Parts of the pond can be
deeper than 7.5 ft., but in no case can any part of the pond be less than 3 ft deep.
/6. If the 85% T rt is used a 30' vegetated filter must be provided at the outlet of the
/ pond. If thid
90% S chart is used, no filter is required.
VVV /7. Use the correc SA/DA TSS chart from the BMP Manual noting that there are different
Y/ charts for different areas of the State.
Required surface area at permanent pool.
9. Provided surface area at permanent pool (Based on pond dimensions)
10'equired volume calculation based on 1.5" storm for Phase II projects* and 1" storm for
all others projects. *unless the project is Phase II and within '/2 mile of and draining to
SR waters then the volume calculation must be based on difference between the pre
and post development conditions for the 1-yr 24-hr storm.
11. Table of elevations, areas, incremental volumes and accumulated volumes for overall
pond and for forebay, to verify volumes provided. '
/ 12. Forebay designed to hold 20% of the permanent pool volume. (Range of 18%-22%
V14
OK.)
Non -erosive flow for M yr. storm in the vegetated filter, if using 85% TSS.
. The seasonal high water table must be at or below the ,proposed permanent pool
elevation to assure that the necessary volume will be available above the permanent
pool.
J 15. Rounding numbers off during the calculation process can result in deficiencies. Do not
round the numbers until you get to the final result. - 1�
16. An additional one foot must be excavated below the bottom elevation of the pond. The 1
foot sediment accumulation depth is not included in the average'depth calculation.
•J:
V

i
Wet Detention Pond, cont.
C. PLANS- Due to storage space constraints, plan sheets should be kept to a minimum. For
small commercial single'wet pond projects, the plan set could consist of only 2 or 3 sheets,
la out, grading and details. For larger projects, show as much information as possible on as
w sheets as possible, without cluttering them up.
�I DevelopmenUProject Name
2. Engineer..name and firm.
J/ Legend
North Arrow
Location Map with nearest intersection of two major roads shown. Major road is any 1,
2, or 3 digit NC, US or interstate highway.
6 Scale- standard engineering scale, no off-the-wall stuff.
/7. Date
--- 8. Revision mber and date, if appp cable.
✓9. Origi contours, proposedWtou,rs, spot elpsgitions, finis floor ele ons, pipe
intefts, swale inverts, etc:
✓ 10. Existing drainage (piping, swales, ditches, ponds, etc.), including off -site. Include a map
delineating the drainage areas.
r112.
Property/Projectt boundary lines, bearing &distances.
Mean High Water Line or Normal High Water Line, if applicable.
3--The permanent pool elevation must be above the SHWT and above the lowest
elevation of adjacent wetlands. Evaluate the need for a liner and/or berm/slurry wall to
prevent dewatering the wetland.
J14. Drainage easement widths, pipe sizes and swale inverts are provided.
15. Wetlands delineated, or a note on the plans that none exist. Get a copy of the wetlands
delineation map signed by the Corps of Engineers, or have the applicant include a copy
of the unsigned delineation map submitted to the Corps. Wet ponds may not be located
in wetlands unle i a per,mmit to fill those wetlands h s been obtained.
16. Details for the roads, pSfking, cul-Vysacs, ino: sidewalk width, radii, dimensions &
slopes: vV
711 ftartment / Condo development- Provide a typical building footprint with dimensions
I and note all concrete and wood deck areas.
1 ;The drainage area for each wet pond is clearly delineated and numbered to match up to
the calculations and supplement. Drainage area delineation is best done as a separate
plan sheet.
19. A pond section detai "include the ay, a,10 wide vegetated shelf, pertin t
elevations for th ottom, perm ent pool,�/iem rary pool, and SHWT, 3:1 pes
above the permanent pool, and.the weiWevation between the main pond and the
forebay.
120. The 101vegetated shelf extends • 6" below and 6" at}ove the permanent pool elevation.
21. An outlet structure detail showing a trash rack wi�ja <6" squar openings, the nec sary
orifice inv rt levation (i,e , the U (nanent pool), orifi.size and, tempor pool
`// elevation.
Dimensions for each line and arc formed by the permanent pool contour.
/,t Mere the 85% TSS chart was used, a 30 ft. vegetated filter strip is required to be
1 shown on the plans & detailed (elevations, inverts, slopes, and flow spreader
mechanism). Please note that the filter strip is not a ditch.
24. A forebay is provided for each inlet and located so as to prevent short-circuiting.
✓25. The pond must have a minimum 1.5:1 length to width ratio and a minimum 3:1 flow path
length. Artificial "baffles' of timber, vinyl, or earth can be used to create a longer flow
path. The top elevation of the baffle should be set at the temporary pool elevation or
higher.
26. A Vegetation plan is specified for the pond, including slopes. Wetlands species are
listed for planting on the 10:1 shelf. Weeping Love Grass is not suitable as a permanent
vegetated cover for pond slopes.
27. All roof drainage must be"directed to the pond. Show the roof drain collection lines on
the plan. This is necessaryfor projects where the. buildings back up the property lines
where roof drainage may leave the site prior to going through the pond.

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