SW7040517_HISTORICAL FILE_20190812

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW�(i�(%��7
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
DOC DATE
,21,91,9�/9 "
WYYMMDD

Thorpe, Roger
From: Genero, George <[e-mail]>
Sent: Monday, August 12, 2019 11:43 AM
To: Thorpe, Roger
Subject: [External] RE: Stormwater permits - First National Bank
External email. Do not click links or open attachments unless you verify. Send all suspicious email as -an attachment to
[e-mail]
Roger,
Thanks for looking into these sites for us.
We will start coordinating on the sites below with FNB to renew and transfer the permit. Is there a way to pull the
actual stormwater permit from the NC DEQ Permits & Rules webpage?
Thanks,
George A. Genero, P.E. / Principal
Civil & Environmental Consultants, Inc.
530 Howell Rd. • Suite 203 • Greenville, SC 29615
Office: [phone] - Fax: [phone]
Mobile: [phone] • http:/Zwww.cecinc.com
Senior Leadership - Integrated Services - Personal Business Relationships
From: Thorpe, Roger <[e-mail]>
Sent: Monday, August 12, 2019 11:04 AM
To: Genero, George <[e-mail]>
Subject: Stormwater permits- First National Bank
George
Sorry we have missed each other by telephone. Here is some information on srormwater permits that I am aware of that
need action.
Permit SW7000502 — Currituck County. Permit expires 6/3/2004. This permit needs to be transferred to First Nation
Bank (FNB) but does not need to be renewed at this time.
Permit SW7041102 — Southern Shores, NC. This permit expired 3/3/2019. This permit needs to be renewed and
tra nsferred.
Permit SW7040517 — Hertford, NC. This permit expired 6/28/2018. This permit needs to be renewed and transferred.
Each application (both renewal and transfer) requires a separate fee of $505.00.
Our office covers the Northeast part of the State and therefore, I am only looking at facilities in the 21 counties that we
serve. These were East Carolina Banks and are the only ones that I am aware of at this time that need action in this
region. If FNB took over other banks (besides East Carolina Bank), there may be others that need action.
We have a Wilmington regional office that may have some facilities that need action. You can contact Georgette Scott,
Supervisor in that office at 910-796-7215 to see if there are affected facilities in her region.

have tried to send you applications as an attachment, but your e-mail service rejects them as spam. If you have
questions, please call.
Roger
Roger K. Thorpe
Environmental Engineer
Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
252-948-3923 office
roger,thorpe(@ncdenr.gov
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

Thorpe, Roger
From: Thorpe, Roger
Sent: Monday, July 22, 2019 3:26 PM
To: Westbrook, Kimberly
Subject: First National Bank Stormwater Permit.
Kimberly
I have found a couple of other First National Banks that have similar issues with stormwater permits not being
transferred. Can you provide me with a name and address of a corporate contact that I can use to send Notices of
Violation. It looks like we may be headed toward an enforcement action. Thanks
Roger
Roger K. Thorpe
Environmental Engineer
Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
252-948-3923 office
[e-mail]
Washington Regional Office
943 Washington Square Mail
Washington, NC 27889
N-`Z.
!--Nothing Compares._--,_.
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
lnlerim Director
Ms. Kimberly Westbrook,
First National Bank
P.O. Box 5
Hertford, NC 27944
Dear Ms. Westbrook.
VV01Rd
NORTH CAROLINA
Environmental Quality
January 29, 2019
Branch Manager
Subject: Stormwater Permit Renewal
Stormwater Management Permit SW7040517
First National Bank, formerly East Carolina Bank
Hertford, NC, Perquimans County
Thank you for speaking with me today concerning the stormwater permit renewal for the
bank in Hertford. Permit SW7040517 for a stormwater treatment system consisting of a
wet detention pond was originally issued to The East Carolina Bank located on Harvey
Point Road in Hertford, NC. This permit expired on June 28, 2018. Permits are not
automatically transferred when property changes hands. North Carolina General
Statutes and the Coastal Stormwater rules require that this property be covered under a
stormwater permit.
The permit needs to be transferred and renewed. Please submit a completed permit
transfer application with a $505.00 application fee and a permit renewal application
along with another $505.00 fee for permit renewal. Permit application forms for renewal
can be found on our website at:
https://dQgnc.gov/about/divisions/energy-mineral-land-resoui-ces,Lenergy-mineral-land=
rules!stormwater-program/ post-constructioil. For your convenience I am sending these
forms to you electronically.
If you have questions, please feel free to contact me at [phone]. 1 will be glad to
discuss this by phone or meet with you.
Sincerely,
Roger K. Thorpe
Environmental Engineer
North Carolina De»ariment of environmental Quality � Division of Energy, Mineral and Land Itesonrees
Washingtun Regional Office 1 943 Washington Square. Mall 1 Washington, North Carolina 7.7889
151.946.6481

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Thorpe,
Roger
From: Westbrook, Kimberly <[e-mail]>
Sent: Tuesday, January 29, 2019 4:03 PM
To: Thorpe, Roger
Subject: [External] RE: Stormwater Permit Renewal and Transfer - First National Bank, Hertford,
NC
Roger,
Asa follow up to our conversation, the point of contact for this matter is Rachelle Vopal. Her email address
is: [e-mail]. I have sent her the information that you provided tome this morning and she will be
handling from this point. Please let me know if you have any problems or this situation is not resolved in a timely
manner.
Thank you,
Kimberly
limberly Westbrook
Hertford Branch Manager III
NMLS * 664483
First National Sank
1103 Harvey Point Road
Hertford, NC 27944
Office Phone, 252.426—W9
Cell Phone: [phone]
Fags: 2.52--426.3861
v.estbrookkra,Fnb-crnp.00m
From: Thorpe, Roger <[e-mail]>
Sent: Tuesday, January 29, 2019 10:59 AM
To: Westbrook, Kimberly <[e-mail]>
Subject: Stormwater Permit Renewal and Transfer - First National Bank, Hertford, NC
1

WARNING - External email; exercise caution when opening attachments or clicking any
links.
Kimberly
Thank you for speaking with me this morning. Attached is a letter, a renewal application, a transfer application, and a
new Operation and Maintenance agreement. I realize that this may look complicated, but I will be glad to assist whoever
completes the forms.
Thanks
Roger
Roger K. Thorpe
Environmental Engineer
Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
252-948-3923 office
roger. thorpe(c)_r1cde_nr.gov
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
Nt'C'.
-::>-Nothtng Compares
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
CONFIDENTIALITY AND DISCLAIMER NOTICE: This email transmission and any attachment thereto is privileged and
confidential and is only intended for review by the party to whom it is addressed or to whom it was intended to be addressed. If
you have received this email in error, please immediately REPLY to the sender to notify him/her of the error and delete it and
any attachments from your system. The contents of this email and any attachment thereto may be considered material non-
public or forward -looking information and your unintended review may subject you to the requirements of federal securities
laws and regulations. Even if you have authorized access to the intended recipients email, you should refrain from discussing or
disclosing the contents of this email or any attachment thereto. Any unintended or unauthorized receipt by you of this email or
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For more information regarding our policy and practices pertaining to email, text messaging and other electronic
communications please click here-. Email/Text and Other Electronic Messaging Disclosure

AVI
Thorpe, Roger
From: Westbrook, Kimberly <[e-mail]>
Sent: Tuesday, January 29, 2019 4:03 PM
To: Thorpe, Roger
Subject: [External] RE: Stormwater Permit Renewal and Transfer - First National Bank, Hertford,
NC
o [E- f ri al6. ail D'on3ot'click ink�sy openLattachments unless you venfy;tSend all suspicious email as an attachment'to :.
rye' rt:s am n ou �+ 4 ., �: a�•.• �;
Roge r,
As a follow up to our conversation, the point of contact for this matter is Rachelle Vopal. Her email address
is: [e-mail]. I have sent her the information that you provided to me this morning and she will be
handling from this point. Please let me know if you have any problems or this situation is not resolved in a timely
manner.
Thank you,
Kimberly
147mberly Westbrook
Hertford Branch Manager III
NMLS * 664483
First National Bank
1103 Haney Point Road
Hertford, NC 277934
Office Phone: [phone]
Cell Phone: [phone]
Fax: [phone]
Wei tb(0okhfa7 fnb-CoSp.Cm
From: Thorpe, Roger <[e-mail]>
Sent: Tuesday, January 29, 2019 10:59 AM
To: Westbrook, Kimberly <[e-mail]>
Subject: Stormwater Permit Renewal and Transfer - First National Bank, Hertford, NC
1

WARNING - External email; exercise caution when opening attachments or clicking any
links.
Kimberly
Thank you for speaking with me this morning. Attached is a letter, a renewal application, a transfer application, and a
new Operation and Maintenance agreement. I realize that this may look complicated, but I will be glad to assist whoever
completes the forms.
Thanks
Roger
Roger K. Thorpe
Environmental Engineer
Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
252-948-3923 office
roger.thorpeencdenr.gov
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
N_ " a -
Nothing Compares.,
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
CONFIDENTIALITY AND DISCLAIMER NOTICE: This email transmission and any attachment thereto is privileged and
confidential and is only intended for review by the party to whom it is addressed or to whom it was intended to be addressed. If
Kit? have received this email in error, please immediately REPLY to the sender to notify him /her of the error and delete it and
any attachments from your system. The contents of this email and any attachment thereto may be considered material non-
public or forward -looking information and your unintended review may subject you to the requirements of federal securities
laws and regulations. Even if you have authorized access to the intended recipients email, vou should refrain from discussing or
disclosing the contents of this email or any attachment thereto. Any unintended or unauthorized receipt by you of this email or
any attachment thereto shall not constitute a waiver of any applicable privilege.
For more information regarding our policy and practices pertaining to email, text messaging and other electronic
communications please click here. Email/Text and Other Electronic Messaging Disclosure

.. F W A TF Michael F. Easley, Governor
0 qpG William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Coleen Sullins, Deputy Director
Division of Water Quality
O
DIVISION OF WATER QUALITY
June 28, 2004
Mr. Dorson White, Executive Vice President
The East Carolina Bank
1001 Red Banks Road
Greenville, NC 27858
Subject Permit No. SW7040517
The East Carolina Bank - Hertford
High Density Stormwater Project
Perquimans County
Dear Mr. White:
The Washington Regional Office received a completed Stormwater Application for the subject project on May 13,
2004. Staff review of the plans and specifications has determined that the project, as proposed, will, comply with the
Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW7040517 dated June 28,
2004 to The East Carolina Bank for the construction and operation of grassed swales and a wet detention pond to serve the
proposed East Carolina Bank located on Harvey Point Road in Hertford, NC.
This permit shall be effective from the date of issuance until June 28, 2014 and shall be subject to the conditions and
limitations as specified therein. 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 stonnwater 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 wrMen 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 Roger Thorpe at
(252) W-6481, extension 214.
Sincerely,
`Jim Illigan
Water Quality Regional Supervisor
Washington Regional Office
CC: Hyman & Robey, PC
Perquimans County Inspections
Washington Regional Office
Central Files
Washington Regional Office 943 Washington Square Mall, Washington NC 27889 252,946.6481(telephone), 252.946.9215(faz)

State Stormwater Management Systems
Permit No. SW7040517
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
The East Carolina Bank
Perquimans County
FOR THE
construction, operation and maintenance of stormwater management systems in compliance with the provisions of 15A NCAC
2H.1000 (hereafter referred to as the "stormwater rules" j 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 for grassed swales and a wet detention pond to serve the proposed East Carolina Bank located on Harvey Point
Road in Hertford, NC.
This permit shall be effective from the date of issuance. until ,tune 28, 2014 and shall be subject to the following specified
conditions and limitations:
DESIGN STANDARDS
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 on page 2 of this
permit, the Project Data Sheet.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
permit.

Project Name:
Permit Number:
Location:
Applicant
Mailing Address:
Application Date:
Receiving Stream:
Classification of Water Body:
Total Site Area:
Total Impervious:
Wet Pond Depth:
Required Storage Volume:
Provided Storage Volume:
Required Surface Area:
Provided Surface Area:
Controlling Orifice:
DIVISION OF WATER QUALITY
PROJECT DATA
The East Carolina Bank - Hertford
SW7040517
Perquimans County
The East Carolina Bank
1001 Red Banks Road
Greenville, NC 27858
5/13/2004
UT to Perquimans River
SC
2.0 ac
0.78 ac
4.0 ft
3,594 cf
4,064 cf
3,049 sf
4,084 sf
1.0 inch @ elevation 11.8 ft

4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales)
shown on the approved plans as part of the stormwater management system without submitting a revision to the
permit and receiving approval from the Division.
The following items will 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
e. Further subdivision of the project area.
In addition, the Director may determine that other revisions to the project should require a modification to the permit.
6. 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.
II. SCHEDULE OF COMPLIANCE
The permittee will comply with the following schedule for construction and maintenance of the stormwater
management system.
a. 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 surfaces except roads.
b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired
immediately.
The facilities must be properly maintained and operated at all times. The approved Operation and Maintenance Plan
must be followed in its entirety and maintenance must occur at the scheduled intervals.
The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater
system functions at optimum efficiency 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.
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. 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.
Upon completion of construction 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. Mail the Certification to
the Washington Regional Office, 943 Washington Square Mail, Washington, North Carolina, 27889, attention Division
of Water Quality.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five
years from the date of the completion of construction.

III. GENERAL CONDITIONS
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 143-215.6(a) to 143-
215.6(c).
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 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.
.Permit issued this the 28 th day of June, 2004.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
►—Alan W. Klimek, P.E. Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7040517

N
The East Carolina Bank — Hertford, NC
Stormwater Permit No. SW7040517
Designers Certification
1, , as a duly
Registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full
time)
the construction of the project,
(Project)
for (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.
Signature
Registration Number
Date

H man & RobeRober, PC
Consulting Engineers and Land Surveyors [phone] Office
[phone] Office
[phone] Fax
May 10, 2004
Mr. Bill Moore
Dept. of Environment and Natural Resources RECEIVED
Water Quality Section
943 Washington Square Mall MAY 1 3 2004
Washington, NC 27889
DWQ-WARQ
Subject: Stormwater Management Permit
The East Carolina Bank
In Hertford
Proj. # 040009
Dear Mr. Moore:
Enclosed for your review and approval, please find the following items:
1. Two (2) copies of the above referenced plans.
2. The original and one (1) copy of the Stormwater Exemption Application
and Wet Detention Basin Supplement.
Two (2) copies of the project description and calculations.
4. Check in the amount of $420.00 for the required fee.
If you have any questions, please do not hesitate to call this office at
[phone].
cc: file
Gene Rackley
Sincerely,
Sean C. Robey, P.E.
!Kimberly,
D.
Engineering Assistant
150-A US Highway 158 East, Camden, NC 27921

PERMANENT POOL DETENTION PONDS Hyman & Robey, PC
DESIGN OF POND 150-A Hwy 158 East
Camden, NC 27921
East Carolina Bank of Hertford (252)-335-1888
10 Yr, 24 Hr Storm 04/15/04
DETENTION POND
SA/DA PERCENTAGES FOR 90% TSS REMOVAL WITHOUT VEGETATIVE FILTER
% IMPRV
3.0 FT
3.5 FT
4.0 FT
4.5 FT
5.0 FT
5.5 FT
6.0 FT
6.5 FT
10 %
1.3
1.0
0.8
0.7
0.6
0.5
0.4
0.3
20 %
2A
2.0
1.8
1.7
1.5
1.4
1.2
1.0
30 %
3.5
3.0
2.7
2.5
2.2
1.9
1.6
1.3
40 %
4.5
4.0
3.5
3.1
2.8
2.5
2.1
1.8
50 %
5.6
5.0
4.3
3.9
3.5
3.1
2.7
2.3
60 %
7.0
6.0
5.3
4.8
4.3
3.9
3.4
2.9
70 %
8.1
7.0
6.0
5.5
5.0
4.5
3.9
3.4
80 %
9.4
8.0
7.0
6.4
5.7
5.2
4.6
4.0
90 %
10.7
9.0
7.9
7.2
6.5
5.9
5.2
4.6
100 %
12.0
10.0
8.8
8.1
7.3
6.6
5.8
5.1
nECEIVED
MAY Z 3 2004
Page IDWQ-WARO
7.0 FT
0.2
0.9
1.1
1.4
1.9
2.4
2.9
3.4
3.9
4.3
WATERSHED AREA. 2 ACRES
WATERSHED % IMPERVIOUS: 40 %
PERMANENT POOL ELEVATION: 11.8 FT
DESIGN PERMANENT POOL DEPTH: 4 FT
SAIDA PERCENTAGE FACTOR: 3.5 % (FROM ABOVE TABLE - TAKEN FROM DESIGN OF STORM WATER
POND SURFACE AREA REQ'D:
FOREBAY AREA:
AT WIDTH = 0.33 LENGTH,
WIDTH = 31.881 LF
LENGTH = 95.6431 LF
CONTROL FACILITIES WORKSHOP .MANUAL . PENC 1988)
3049 SF
915 SF
(BASED UPON MINIMUM SURFACE AREA)
Use these dimensions: WIDTH 24 LF
LENGTH 170.17 LF
VOLUME OF I" RAINFALL
AREA OF ROOFS: 0. l AC
AREA OF PARKING/CONCRETE: 0.68 AC
AREA OF GREEN AREAS: 1.22 AC
VOLUME OF RUNOFF 3593.7 CF
STORAGE DEPTH FOR MINIMUM AREA =
ELEVATION OF i" RAINFALL = 12.68
Normal Pool Elevation 11.8
VOL (CF)=I(ROOF*1.0)+(PARK.ING-.95)f(GRASS*0.2)]*43,560/12
0.88 FT

DRAWDOWN - WATER QUALITY
Q(2 DAYS) = 0.0208 CFS
Q(5 DAYS) = 0.00832 CFS
I" RUNOFF STAGE 0.88 FT
DEPTH OF DRAWDOWN DEVICE BELOW OUTLET 1.5 FT
1" RUNOFF OUTLET DEVICE: 0.91418 INCH DIA HOLE
DIAMETER OF HOLE TO USE: 1 INCH DIAMETER
1" STORM RUNOFF DRAWDOWN TIME 2.3878 DAYS
A=(Q/(Cd*SQRT(2gh))]* 144
Rad.=SQRT(A/PI)
Dia.=2*Rad.
INFLOW HYDROGRAPH
Return Year Storm 10 Yr
Qp = Peak Discharge = 7 cfs
Tc = Time of Concentration = 36.6 min
Calculation of Tp (Time to Peak)
From SCS NEH 4 , page 15-7 Eqn. 15.4
Lag Time (L) = (1"0.8*(S+1)"0.7)/(1900*Y"0.5) for L in Hrs
where: I = hydraulic length of watershed (ft)
S = (1000/CN)-10
CN = approximately same CN from TR-55
Y = avg. watershed land slope in %
S = (1000/CN)-10 = 2.04819
L = 0.22599 hrs
From SCS NEH 4 , page 16-7 Eqn. 16.7
Tp=D/2+L
where : D = unit of excess duration rainfall (hrs)
L = Lag Time (hrs)
From SCS NEH 4 page 16-8 Eqn. 16,12
D = 0.133 tc
where: Tc = Time of Concentration (hrs) - (See Tr-55 Printout)
THEREFORE: D = 0.08113 hrs
Tp =
0.26656 hrs =
15.9933
min
Volume under Hydrograph
= 1.39 * Qp * Tp =
9336.91
Cubic Feet
626
2.04819
83
0,77

Inflow Hydrograph
SCS Dimensionless Hydrograph
Time
Discharge Time Discharge
Volume
Ratio
Ratio hr cfs
cf
0.00
0.00 0.00
0
0.10
0.03 0.03
0
20
0.20
0.10 0.05
1
67
0.30
0.19 0.08
1
128
0.40
0.31 0.11
2
208
0.50
0.47 0.13
3
316
0.60
0.66 0.16
5
443
0.70
0.82 0.19
6
551
0.80
0.93 0.21
7
625
0.90
0.99 0.24
7
665
1.00
1.00 0.27
7
672
1.10
0.99 0.29
7
665
1.20
0.93 0.32
7
625
1.30
0.86 0.35
6
578
1.40
0.78 0.37
5
524
1.50
0.68 0.40
5
457
1.60
0.56 0.43
4
376
1.70
0.46 0.45
3
309
1.80
0.39 0.48
3
262
1.90
0.33 0.51
2
222
2.00
0.28 0.53
2
188
2.20
0.21 0.59
1
278
2.40
0.15 0.64
1
197
2.60
0.11 0.69
1
144
2.80
0.08 0.75
1
L03
3.00
0.06 0.80
0
74
3.20
0.04 0.85
0
54
3.40
0.03 0.91
0
39
3.60
0.02 0.96
0
28
3.80
0.02 1.01
0
20
4.00
0.01 1.07
0
15
4.50
0.01 1.20
0
17
5.00
0.00 1.33
0
0
Volume under hydrograph =
8869 cf
Based upon runoff volume
= 9336.91 cf
Depth req'd for minimum area - 2.28617

STAGE STORAGE FUNCTION OF POND
(FOR RECTANGULER DETENTION POND ONLY)
Minimum surface area taken at normal water level
BASIN AREA INCR ACCUM
VOLUME VOLUME STAGE In s
S Z
sf cf cf ft
Pond Side Slope (M) =
In Z Z est Elevation
4084 0
0
0
Surface area at normal pool
11.8
4676 2190
2190
0.5
7.69
-0.69
0.50
12.3
5285 2490
4680
1
8.45
0.00
0.96
12.8
5913 2799
7480
1.5
8.92
0.41
1.45
13.3
6558 3118
10597
2
9.27
0.69
1.96
13.8
7222 3445
14042
2.5
9.55
0.92
2.50
14.3
7903 3781
17823
3
9.79
1.10
3.07
14.8
8603 4126
21950
3.5
10.00
1.25
3.68
15.3
9320 4481
26430
4
10.18
1.39
4.33
15.8
10056 4844
31274
4.5
10.35
1.50
5.01
16.3
10809 5216
36491
5
10.50
1.61
5.73
16.8
Regression
Output:
Constant
9.34346
Ks = S/Z"b
- 4885.93
Std Err of Y Est
0.00969
R Squared
0.99962
No. of Observations
7
Degrees of Freedom
5
X Coefficient(s) 1.15215 = b
Std Err of Coef. 0.01009
FOR VERTICAL SIDED DETENTION POND SET b=0, AND Ks = SURFACE AREA (SF)
Page 4
STAGE DISCHARGE
(FOR RISER/BARBELL SPILLWAY
W EMERGENCY WEIR)
RISER
Dr =
23
Riser Dia. (in)
Etop =
12.68
Elev. Top Riser (ft) 14.09
Cwr =
3.33
Riser weir coeff
Cdr =
0.60
Riser orifice coeff
Hln =
5
Number of Holes
Hld =
3
Hole Dia. (in)
E141 =
20.00
Elev. Holes (1)
H2n =
5
Number of Holes
H2d =
2
Hole Dia. (in)
EH2 -
20.00
Elev. Holes (2)
H3n =
0
Number of Holes
H3d =
2
Hole Dia. (in)
EH3 =
20.00
Elev. Holes (3)
BARREL:
Db =
15
Barrel Dia. (in)
Einv -
11.80
Elev Invert Barrel (ft) Barrell Adjustment Factor
Cdb =
0.60
Barrel orifice coeff
3

EMERGENCY WEIR Page 5
Cw
=
3
Weir coeff
Ecr
=
20.00
Elev weir coeff (ft)
Lw
=
10
Weir Length (ft)
Riser
Riser
Riser
Elevation
Hole
Hole
Hole
Riser Riser
Barrel
Principal
Emergcy
(1)
(2)
(3)
(weir) (orifice)
Spillway
Weir
11.80
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
11.80
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
11.81
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
11.83
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
11.87
0.0
0.0
0.0
0.0
0.0
0.1
0.00
0.0
11.92
0.0
0.0
0.0
0.0
0.0
0.1
0.00
0.0
11.99
0.0
0.0
0.0
0.0
0.0
0.3
0.00
0.0
12.09
0.0
0.0
0.0
0.0
0.0
0.5
0.00
0.0
12.21
0.0
0.0
0.0
0.0
0.0
0.9
0.00
0.0
12.33
0.0
0.0
0.0
0.0
0.0
1.3
0.00
0.0
12.46
0.0
0.0
0.0
0.0
0.0
1.8
0.00
0.0
12.58
0.0
0.0
0.0
0.0
0.0
2.3
0.00
0.0
12.71
0.0
0.0
0.0
0.1
2.2
2.9
0.08
0.0
12.82
0.0
0.0
0.0
1.0
5.1
3.4
1.01
0.0
12.90
0.0
0.0
0.0
2.1
6.5
3.9
2.08
0.0
12.96
0.0
0.0
0.0
2.9
7.3
4.2
2.93
0.0
12.99
0.0
0.0
0.0
3.4
7.7
4.3
3.42
0.0
13.00
0.0
0.0
0.0
3.6
7.8
4.4
3.56
0.0
12.99
0.0
0.0
0.0
3.5
7.7
4.3
3.47
0.0
12.98
0.0
0.0
0.0
3.3
7.6
4.3
3.26
0.0
12.96
0.0
0.0
0.0
3.0
7.4
4.2
3.01
0.0
12.93
0.0
0.0
0.0
2.5
6.9
4.0
2.47
0.0
12.89
0.0
0.0
0.0
2.0
6.4
3.8
1.97
0.0
12.86
0.0
0.0
0.0
1.5
5.9
3.7
1.55
0.0
12.83
0.0
0.0
0.0
1.2
5.5
3.5
1.22
0.0
12.81
0.0
0.0
0.0
1.0
5.0
3.4
0.95
0.0
12.79
0.0
0.0
0.0
0.8
4.6
3.3
0.75
0.0
12.78
0.0
0.0
0.0
0.6
4.3
3.2
0.59
0.0
12.76
0.0
0.0
0.0
0.5
4.0
3.2
0.47
0.0
12.75
0.0
0.0
0.0
0.4
3.7
3.1
0.38
0.0
12.74
0.0
0.0
0.0
0.3
3.5
3.1
0.31
0.0
12.72
0.0
0.0
0.0
0.2
2.8
3.0
0.17
0.0
12.71
0.0
0.0
0.0
0.1
2.4
2.9
0.10
0.0

Page 6
ROUTING OF INFLOW HYDROGRAPH THROUGH POND AND OUTFLOW DEVICE
Total
Riser
Riser
Riser
Barrel
Emerg
Time
Inflow
Storage
Stage
Outflow
Holes
(weir)
(orifice)
Spillway
t (hr)
cfs
cf
Elevation
cfs
(1f2t3)
cfs
cfs
cfs
cfs
cfs
0.000
0
0
11.80
0.00
0.00
0.00
0.00
0.00
0.00
0.027
0
0
11.80
0.00
0.00
0.00
0.00
0.00
0.00
0.053
1
20,1516
11.81
0.00
0.00
0.00
0.00
0.00
0.00
0.080
1
87.3236
11.83
0.00
0.00
0.00
0.00
0.02
0.00
0.107
2
214.95
11.87
0.00
0.00
0.00
0.00
0.06
0.00
0.133
3
423.184
11.92
0.00
0.00
0.00
0.00
0.14
0.00
0.160
5
738,892
11.99
0.00
0.00
0.00
0.00
0.29
0.00
0.187
6
1182.23
12.09
0.00
0.00
0.00
0.00
0.53
0.00
0.213
7
1733.04
12.21
0.00
0.00
0.00
0.00
0.87
0.00
0.240
7
2357.74
12.33
0.00
0.00
0.00
0.00
1.30
0.00
0.267
7
3022.74
12.46
0.00
0.00
0.00
0.00
1.79
0.00
0.293
7
3694.46
12.58
0.00
0.00
0.00
0.00
2.33
0.00
0.320
7
4359.46
12.71
0.08
0.00
0.08
2.23
2.89
0.00
0.347
6
4976.2
12.82
1.01
0,00
1.01
5.12
3.43
0.00
0.373
5
5457.36
12.90
2.08
0.00
2.08
6.53
3.87
0.00
0.400
5
5781.72
12.96
2.93
0.00
2.93
7.32
4.17
0.00
0.426
4
5957.49
12.99
3.42
0.00
3.42
7.71
4.33
0.00
0.453
3
6005.07
13.00
3.56
0.00
3.56
7.81
4.38
0.00
0.480
3
5972.22
12.99
3.47
0.00
3.47
7.74
4.35
0.00
0,506
2
5901.53
12.98
3.26
0.00
3.26
7.59
4.28
0.00
0.533
2
5810.01
12.96
3.01
0.00
3.01
7.38
4.19
0.00
0.586
1
5609.16
1293
2.47
0.00
2.47
6.91
4.01
0.00
0.640
1
5414.04
12.89
1.97
0.00
1.97
6.41
3.83
0.00
0.693
1
5232.78
12.86
1.55
0.00
1.55
5.92
3.66
0.00
0.746
1
5079.37
12.83
1.22
0.00
1.22
5.46
3.52
0.00
0.800
0
4949.63
12.81
0,95
0.00
0.95
5.03
3.40
0.00
0,853
0
4840.42
12.79
0.75
0.00
0.75
4.65
3.31
0.00
0.906
0
4750.09
12.78
0.59
0.00
0.59
4.30
3.23
0.00
0.960
0
4674.9
12.76
0.47
0.00
0.47
3.99
3.16
0.00
1.013
0
4612.08
12.75
0.38
0.00
0.38
3.71
3.11
6.00
1.066
0
4559.17
12.74
0.31
0.00
0.31
3.45
3.06
0.00
1.199
0
4448.7
12.72
0.17
0.00
0.17
2.84
2.96
0.00
1.333
0
4383.12
12.71
0.10
0.00
0.10
2.41
2.91
0.00
12.996 = maximum stage elevation
3.56235 = maximum discharge

The Fast Carolina Bank
Hertford, NC
10 yr STORM
liz
6
i+1JIJ
� % t } ' J ��l �'�t _ i y�.r� n' tis [4 %� 7�, �:• rt � I .. -+�,' =1
F) 4
�� i
3 � a r
77
0 C7rr tnr'�gS119r�tj�s',ry;i.5 s!Er'r" �6♦O i�F ..�, —1i i
—"�—"`■—"-
0.000 0.200 0.400 0.600 0.800 1.000 1.200 1.400
Time (hrs)
- ®— INFLOW (cfs)
+ OUTFLOW (cfs)

'RECEIVED
DESCRIPTION ,MAY 3 2004
­­-..,­,—,­-PROJECTb wi. J� °M 4
The East Carolina Bank ®WQ-WARO
Perquimans County - North Carolina
The East Carolina Bank is proposing construction of a new branch office on Lot 1
— Section C — Perquimans Commerce Centre. This is a vacant, 2 acre lot located on the
corner of Harvey Point Road (SR 1336) and Commerce Drive. Public water and sewer
service are available to this lot.
Development on this site will include a 2,784 sf building with a covered porch
and a canopy for the drive through and related parking and drainage. A future parking
expansion of 1,431 sf has been included in all stormwater design calculations. The total
future impervious area will be 34,051 sf or 39.08% of the site. All stormwater will sheet
flow across the parking lot to a curb and gutter collection system. The curb and gutter
will discharge into a flat, grassed swale with 3:1 side slope. The swale will provide pre-
treatment and storage area for the stormwater that it routes to a detention pond designed
for 90% TSS removal.
The soils on site are Augusta. While the permeability rate could possibly support
the use of an infiltration basin, the high water table makes a wet detention basin the more
logical choice for stormwater treatment on this site.
The disturbed area for development is approximately 2 acres.

FRECEIVED
MAY 1 3 2004
* _Generated for use by GRAPHIC method
DINQ-WARO
TR-55 GRAPHICAL DISCHARGE METHOD VERSION 1.11
Project EAST CAROLINA BANK (HERTFORD) User: KDH Date. 03-01 -04
County PERQUIMANS State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND
Data: Drainage Area 2 * Acres
Runoff Curve Number 83
Time of Concentration: 0.61 * Hours
Rainfall Type II
Pond and Swamp Area NONE
Storm Number 1 1 1 2 1 3 1 4! 5 1 6 1 7 1
I----------------------I------1-------I------I------1------I------I------I
I Frequency (yrs) I 1 1 2 1 5 1 10 1 25 1 50 1 100 1
I I I I I I I I
I 24 -Hr Rainfall (in) I 3. 5 1 4 I 5.5 1 6. 3! 7. 1 1 8.3 1 9. 1 1
I I I I I 1 I I I
1 la/P Ratio 1 0.12 I 0.10 1 0.07 1 0.07 1 0.06 1 0.05 1 0.05 1
I I I I I I I I I
Used I 0.12 1 0.10 1 0.10 1 0.1C I 0.10 1 0.10 1 0.10 i
I I I I I I I I I
I Runoff ( in) I 1.86 1 2.29 1 3.63 I 4.37 1 5.12 1 6.26 1 7.03 1
I I I I I I I I I
Unit Peak Discharge f 0. 733 1 0. 742 10.744 1 0. 744 1 0. 744 1 0. 744 10. 744 1
I { c£s/acre/in) I 1 f I I I I
I I I I I I I 1 I
I Pond and Swamp F'actorl 1.00 j 1.00 I 1.00 1 1.00 1 1.00 1 1.00 I 1.00 1
I 0.0% Ponds Used I 1 I I I I I
1----------------------1------I------I------I------I------I------I------I
I Peak Discharge (cfs) I 3 1 3 1 5 1 7 1 8 1 9 1 10 1
* - Value(s) provided from TR-55 system routines
* - Value(s) provided from TR-55 syste

TR-55 CURVE NUMBER COMPUTATION VERSION 1.11
Project EAST CAROLINA BANK (HERTFORD) User: KDH Date: 03-01-04
County PERQUIMANS State: NC Checked: Date:
Subtitle: DRAINAGE TO DETENTION POND
Subarea : 2
-------------------------------------------------------------------------------
Hydrologic Soil Group
COVER DESCRIPTION A B C D
Acres (CN)
----------------------------------_--_----------------------_--------------------
FULLY DEVELOPED URBAN AREAS (Veg Estab. )
Open space ( Lawns, parks etc. )
Good condition; grass cover > 75% - - 1.22(74) -
Impervious Areas
Paved parking lots, roofs, driveways - - 0. 78( 98) -
Total Area
(by Hydrologic Soil
Group)
2
-------------------------------------------------------------------------------
SUBAREA: 2
-------------------------------------------------------------------------------
TOTAL DRAINAGE
AREA: 2 Acres
WEIGHTED CURVE NUMBER:83*
* - Generated for use by GRAPHIC method
TR-55 Tc and
Tt THRU SUBAREA
COMPUTATION VERSION
1.11
Project EAST CAROLINA BANK
(HERTFORD)
User: KDH Date. 03 -01
-04
County PERQUIMANS
State: NC
Checked: Date:
Subtitle: DRAINAGE TO DETENTION
POND
-------------------------------------------------------------------------------
Flow Type 2 year Length
Slope Surface
n Area Wp Velocity
Time
rain (ft)
(ft/ft)
code
(sq/ft) (ft) (ft/sec)
(hr)
-------------------------------------------------------------------------------
Sheet 4 16
.0012
F
0.151
Sheet 50
.01
A
0.014
Shallow Concent'd 250
.0026
P
0.067
Shallow Concent'd 310
.0002
U
0.377
Time of Concentration =
0.611
--- Sheet Flow Surface
Codes ---
A Smooth Surface
F Grass,
Dense
--- Shallow Concentrated ---
B Fallow (No Res.)
G Grass,
Burmuda --- Surface Codes
---
C Cultivated < 20 % Res.
H Woods,
Light
P Paved
D Cultivated > 20 % Res.
T Woods,
Dense
U Unpaved
E Grass -Range, Short