SW7060410_CURRENT PERMIT_20191104

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 7OlOL��
DOC TYPE
� CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
DOC DATE
YYYYMMDD

N6 � )
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
November 4, 2019
Perkins Estates Property Owners' Association, Inc.
Attention: Clyde Pelfrey, President
811 Kylers Way
Elizabeth City, NC 27909
Subject: Permit No. SW060410 Renewal
Perkins Estates
High Density Stormwater Project
Pasquotank County
Dear. Mr. Pelfrey-.
The Washington Regional Office received a Stormwater Management Permit Application
for renewal of permit SW7060410 on September 25, 2019. Staff review of the submittal
has determined that the permit can be reissued. We are forwarding Permit No.
SW7060410 dated November 4, 2019, for the construction and operation of the subject
project.
This permit, upon its effective date, will replace all previous State Stormwater permits for
this site. This permit shall be effective from May 9, 2020 until May 8, 2028 and shall be
subject to the conditions and limitations as specified therein, and does not supercede any
other agency permit that may be required.
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,
Roger K. Thorpe
Environmental Engineer
QNorth� Carolina Department of Environmental Quality 1 Division ofEnergy. Nitneral and Land Resources
D- EWashington Regiona} Office 1 943 Washington Square Mall I Washington, North Carolina 27889
_
252,946.6481

t
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
Perkins Estates Property Owners' Association, Inc.
Perkins Estates Sudivision
Pasquotank County
FOR THE
construction, operation and maintenance of 2 wet detention ponds 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 May 9, 2020 until May 8, 2028 and shall be subject to
the following specified conditions and limitations:
I. 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 in Section 1.5 of this permit.. The subdivision is permitted for
82 lots, each allowed 7,000 square feet of built -upon area.
3. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.

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.
5. The following design elements have been permitted for these wet detention pond
stormwater facilities, and must be provided
in the systems at all times.
Pond 1 Pond 2
a. Drainage Area, acres:
36.36 6.30
b. Total Impervious Surfaces, ac:
15.59 2.25
c. Pond Depth, feet:
5.00 4.00
d. TSS removal efficiency:
90% 90%
e. Design Storm:
1" 1"
f. Permanent Pool Elevation, FMSL:
5.00 5.00
g. Permitted Surface Area @PP, ftz:
65,778 19,676
h. Permitted Storage Volume, ft3:
72,971 11,803
i. Storage Elevation, FMSL:
6.07 5.58
j. Controlling Orifice:
4.50" 2.125"0 pipe
k. Permanent Pool Volume, ft3:
221,711 47,243
1. Forebay Volume, ft3:
42,346 9,735
m. Receiving Stream 1 River Basin:
Charles Creek 1 Pasquotank
n. Stream Index Number:
30-3-11
o. Classification of Water Body:
"C; Sw"

IL SCHEDULE OF COMPLIANCE
No homeowner/lot owner/developer shall fill in, alter, or pipe any drainage feature
(such as swaies) 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.
2. The permittee is responsible for verifying that the proposed built -upon area for
the entire lot, including driveways and sidewalks, does not exceed the allowable
- guilt -upon area. Once the lot transfer is complete, the built -upon area may not be
revised without approval from the Division, and responsibility for meeting the
built -upon area limit is transferred to the individual property owner.
3. If an Architectural Review Board or Committee is required to review plans for
compliance with the BUA limit, the plans reviewed must include all proposed
built -upon area. Any approvals given by the Board do not relieve the lot owner of
the responsibility to maintain compliance with the permitted BUA limit.
4. 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 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, acquisition, 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.
5. 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.

7. 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.
8. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
9. 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.
10. 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.
11. Permanent seeding requirements for the stormwater control must follow the
guidelines established in the North Carolina Erosion and Sediment Control
Planning and Design Manual.
12.. This permit shall be effective from May 9, 2020 until May 8, 2028. 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.
13. Prior to the sale of any lot, the following deed restrictions must be recorded:
a. The following covenants are intended to ensure ongoing compliance with
State Stormwater Management Permit Number SW7060410, as issued by
the Division under NCAC 2H.1000.
b. The State of North Carolina is made a beneficiary of these covenants to
the extent necessary to maintain compliance with the Stormwater
Management Permit.
C. These covenants are to run with the land and be binding on all persons
and parties claiming under them.
d. The covenants pertaining to stormwater may not be altered or rescinded
without the express written consent of the State of North Carolina, Division
of Energy, Mineral and Land Resources.
e. Alteration of the drainage as shown on the approved plans may not take
place without the concurrence of the Division.

The maximum built -upon area per lot is 7,000 square feet. This allotted
amount includes any built -upon area constructed within the lot property
boundaries, and that portion of the right-of-way between the front lot line
and the edge of the pavement. Built upon area includes, but is not limited
to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and
parking areas, but does not include raised, open wood decking, or the
water surface of swimming pools.
g. Lots within CAMA's Area of Environmental Concern may be subject to a
reduction in their allowable built -upon area due to CAMA regulations.
h. All runoff on the lot must drain into the permitted system. This may be
accomplished through providing roof drain gutters, which drain to the
street, grading the lot to drain toward the street, or grading perimeter
swales and directing them into the pond or street. Lots that will naturally
drain into the system are not required to provide these measures.
Built -upon area in excess of the permitted amount will require a permit
modification.
14. A copy of the recorded deed restrictions must be submitted to the Division
within 30 days of the date of recording the plat, and prior to selling lots.
The recorded copy must contain all of the statements above, the signature
of the Permittee, the deed book number and page, and the stamp/signature
of the Register of Deeds.
15. Prior to transfer of the permit, the stormwater facilities will be inspected by
Division personnel. The facility must be in compliance with all permit conditions.
Any items not in compliance must be repaired or replaced to design condition
prior to the transfer. Records of maintenance activities performed to date will be
required.
16. The permittee shall at all times provide the operation and maintenance
necessary to assure that all components of the permitted stormwater system
function 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 structures, orifice, catch basins and
piping.
g. Access to all components of the system must be available at all times.

17. 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.
18. 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.
19. Built upon area includes, but is not limited to, structures, asphalt, concrete,
gravel, brick, stone, slate, coquina and parking areas, but does not include
raised, open wood decking, or the water surface of swimming pools.
III. GENERAL CONDITIONS
This permit is not transferable to any person or entity except after notice to and
approval by the Director. In the event there is either a desire for the facilities to
change ownership, or there is a name change of the Permittee, a
"Name/Ownership Change Form" must be submitted to the Division
accompanied by appropriate documentation from the parties involved. This may
include, but is not limited to, a deed of trust, recorded deed restrictions,
Designer's Certification and a signed Operation and Maintenance plan. The
project mast be in good standing with the Division. The approval of this request
will be considered on its merits and may or may not be approved.
2. The permittee is responsible for compliance with all of the terms and conditions
of this permit until such time as the Director approves the transfer request.
3. 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.
4. 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.
5. 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.
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. Permittee grants permission to staff of the DEQ to access the property for the
purposes of inspecting the stormwater facilities during normal business hours.
8. The permittee shall notify the Division of any name, ownership or mailing address
changes within 30 days.
9. 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.
Permit issued this the 4th day of November, 2019.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
_ for
S. Daniel Smith, Director
Division of Energy, Mineral, and Land Resources
By Authority of the Environmental Management Commission
Permit Number SW7060410 ..

I
Date Received
Fee Paid
Permit Number
�-5- If
5 os, as
c 9 v a
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 holder shall renew their high density permit 180 days
prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781)
Section 60.(c). This application form is for permit renewals only.
A. PROJECT INFORMATION
�� / RECEIVED SEP 2 5 71"
1. State Stormwater Permit �Nfumber: S �V _70 6 0 Z11 0
2. Project name: AL t K /y J
3. Project street address: 811 K'r'C c � S j+v✓�j
City: d, Ty County: e9SL_w►o zip :a7 o9
4. What, if any, changes have been made to the project as permitted? _
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:ildeq.nc.gov_labout/division s/energy-
mineral-land-resourceslenergy-mineral-land-rulesistormwater-programlpost-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/abouVdivisionslenergy-mineral-land-
resources/ener - ineral-land-rules/stormwater- ro ra►nl ost-construction. State Stormwater permits do not
automatically transfer with the sale of the property. 1 Current Permit Holder's Company Name/Or anizatio(n�: f ep kr
2. Signing Official's Name: _C�LV V&- ?Z` -Ft-F
3. Signing Official's Title: Yr-D�/J -r
4. Mailing Address:
City: ' State: /`f L ZIP Q'7 0�
5. Street Address:
city: Chi 0)9 AC J/y �,'�4 state: WE zip tz/ 0 I
6. Phone: (25,2 f ]/U Email: Pt')Z 00772- 004 . C°o/n
Ssornrvvater Permit Renewal Form Page 1 of 3 May 11, 2018

C. SUBMITTAL REQUIREMENTS
Submit the application package to the appropriate DEMLR Re Tonal Office (Coastal, SA Waters) or DEMLR
Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal NQ W/ORM, 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:
�C 1. A permit application processing fee of S505.00 payable to NCDEQ.
CIO
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.
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
r Q and protective covenants will be submitted at a later date.
1� 4. O&M Agreements, Please select one:
1 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
❑ I 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.
n d 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
h ❑ The project has not yet been built.
7
X 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,
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 2N. 1043(3)(b).
https;/lwww.soaag_q v/online services/search/by title/ Business Registration
S<<,rniwater Pawil R.rnewal Application Form Page 2 of 3 Mav 11, 2018

D. PERMiTTEE'S CERTIFICATION
I, �L ��� ��L���1 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 DEVILR of any problems with the SCMs
or built -upon area and to submit the prop ms to modify or transfer the permit prior to any changes to the
project, SCMs, or o shi A in r provided on this permit renewal application is, to the best of my
kriowledge, corre l f' �j
Signature: Date: /�"
NOTARIZATION:
,n (_ t�(o tS a Notary Public for the State of
�County of<q�' > K do hereby certify
that ��. e �.�- f personally appeared before me
this the 1 day of S �'►^ uj �� 20tC)l , and acknowledge the due
execution of the forgoing instrument. Witness my hand and official seal,
'
i
Ui
v-jNota.Sign43rg:
�Od N yommisSexpires
ItsimW
Otor nwi a(er Permit Renewal Application Form Page 3 of 3 May 11. 2018

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Operation & Maintenance Agreement
Project Name:' Perkins Estates
Project Location: JPasquotank County
Cover Page
Maintenance records shall be kept on the following BMP(s). This maintenance record shall 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 pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include (check all that apply & cc
Bioretention Cell
Quantity:
Dry Detention Basin
Quantity:
Grassed Swale
Quantity:
Green Roof
Quantity:
Infiltration Basin
Quantity:
Infiltration Trench
Quantity:
Level SpreaderNFS
Quantity:
Permeable Pavement
Quantity:
Proprietary System
Quantity:
Rainwater Harvesting
Quantity:
Sand Filter
Quantity:
Stormwater Wetland
Quantity:
Wet Detention Basin
Quantity:
Disconnected Impervious Area
Present:
User Defined BMP
Present:
qg O&M tables will be added automatically):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s): P91-215 and P91-216 in Tax Card files
Location(s):
Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Sig
Clyde Pelfrey
President, Perkins Estates Property Owner's Association, Inc.
811 Kyler's Way
Elizabeth City, NC 27909-8757
252-338-1710
Perkins Esta sea Outlook.Com
e of
Date:
1�C7-ACPYO rn
County of ¢�SC•�°hra�+i,�� do hearby certify that
personally appeared before me this _ � day of "'Ll- 1and
acknowledge the due execution of theAperations and Maintenan reement .
Witness my hand and official seal,
0J� RE�EIV E
1, 1�tQ`� My commission expires 2_(zs-zs)
i vi{IV �Z
O&M Manual 9/15/2019
Page 1 of 4

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Wet Detention Pond Maintenance Requirements
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
one is provided.
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.
finer the wet retention 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.
BIMP element:
Potential problem:
How I will remediate the problem:
Tka entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the BMP
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed.
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 approximately six inches.
long.
Tire inlet device
The pipe is clogged.
Unclog the pipe. Dispose of the sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the Swale if necessary to smooth it over and provide erosion
Swale.
control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
Tt;e forebay
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location where
original design depth for
it will not cause impacts to streams or the BMP.
sediment storage.
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 practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or
Determine the source of the problem: soils, hydrology, disease, etc.
dying.
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.
9/15/2019
deli 1.4 O&M Manual Page 2 of 4

Wet Detention Pond Maintenance Requirements Continued
The main treatment area
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location where
original design sediment
it will not cause impacts to streams or the BMP.
storage depth.
Algal growth covers over 50%
Consult a professional to remove and control the algal growth.
of the area.
Cattails, phragmites or other
Remove the plants by wiping them with pesticide (do not spray).
invasive plants cover 50% of
the basin surface.
Ttie embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and consult a professional to remove
beaver activity is present.
beavers.
A tree has started to grow on
Consult a dam safety specialist to remove the tree.
the embankment.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. (if applicable)
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 Department of Environment and Natural
damage have occurred at the
Resources Regional Office.
outlet.
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.
='� 4 O&M Manual 9/15/2019
Page 3 of 4

Wet Detention Pond Design Summary
WET POND ID FOREBAY MAIN POND
Pond 1 Permanent Pool El. 5 Permanent Pool El. 5
Temporary Pool EL Temporary Pool El:
Pretreatment other Yes Clean Out Depth: 2.25 Clean Out Depth: 3.75
than forebay? Sediment Removal El: 2.75 Sediment Removal EL 1.25
Has Veg. Filter? No Bottom Elevation: 2 Bottom Elevation: 0
WET POND ID FOREBAY MAIN POND
Pond 2 Permanent Pool El. 5 Permanent Pool El. 5
Temporary Pool El: Temporary Pool El:
Pietrf;atrnent other Yes Clean Out Depth: 2.25 Clean Out Depth: 3.75
than forebay? Sediment Removal El: 2.75 Sediment Removal El: 1.25
Has Veg. Filter? No Bottom Elevation: 2 Bottom Elevation: 0
rsi•:.; i.•i O&M Manual 9115=19
Page 4 of 4

July 18, 2017
Perkins Estates Property Owners Association
c/o Mr. Jason E. Gillis
1007 Riley Drive
Elizabeth City, NC 27909
Sent via email to: legillis(cDyahoo.com
Subject: Inspection of Wet Detention Basins
Perkins Estates
NCDEQ SW Permit No. SW 7060410
ECE Project No. 170077
Dear Mr. Gillis,
�eT
�� ��� CAR.477LINA
' E11TCINE>iBRIATC, P.C.
RECEIVED SEP 2 S ?t119
Per our agreement, Eastern Carolina Engineering performed a visual inspection of the
two existing wet detention basins located within the Perkins Estates residential
subdivision. The purpose of the inspection was to identify visible deferred maintenance
and to make recommendations for repairs. During the inspection, we found that the
ponds and the site are substantially in compliance with the 'design plans prepared and
permitting by Hyman & Robey, PC in 2006 but they are in need of maintenance. The
following report details the maintenance concerns.
Also attached are copies of the Operation & Maintenance Agreements that are on file
with NCDEQ. These detail the responsibilities of the HOA with regard to maintenance
and inspection of the detention basins.
Please contact me if you have any questions regarding this report.
Sincerely,
Eastern Carolina Engineering, PC
Kimberly D. Hamby, PE
Vice President - Engineering
cc: file
Eastern Carolina Engineehng, PC
P. O. Box 128 Camden, North Carolina 27921
{252) 3,5-1888 License C-4152
www.easlerocaroliriaengineering.com

State Stormwater Management Systems
Permit No, SW7060410
Page 1 of 2
Perkins Estates
Stormwater Permit No. SVV7060410
Pasquotank County
Designer's Certification
1, Sean C. Rob_ey , as a duly registered Professio . in
the State of North Carolina, having been authorized to observe qenodica eekiy/full
time) the construction -of the project,
Perkins Estates
( Project)
for Down East 'D v 1 (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 are a part of this Certification.
Noted deviations from approved plans and specifications:
Signature
Registration Number 185.570
Date 31LI,/.U/A--� .
CAg01"���ii,�i
. fESSI H� is .
SEAL _
3 18650
•S titiF!4QIF15P.'•
/I 1I
FEB 2 5 2013
C�►' ^ARO
Page 8 of 9

T.
State 5tormwater Management Systems
Permit No. SW7060410
Page 2 of 2
Certification Requirements:
X 1, The drainage area to the system contains approximately the permitted
acreage.
X 2. The drainage area to the system contains no more than the permitted
amount of built -upon area.
X 3. All the built -upon area associated with the project is graded such that the
runoff drains to the system.
NIA_4. All roof drains are located such that the runoff is directed into the system.
X 5. The outlet/bypass. structure elevations are per the approved plan.
X _ 6. The.outlet structure is located per the approved plans.
_ X 7. Trash rack is provided on the outlet/bypass structure.
_ ' 8. All slopes are grassed with permanent vegetation.
X 9. Vegetated slopes are no steeper than 3:1.
X 10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
x11. The'permitted amounts of surface area and/or volume have been
provided.
X _- 12.' Required drawdown devices are correctly sized per the approved plans.
X 13: 'All required design depths are provided.
_X -14. All required parts of the system are provided, such as a vegetated shelf, a
forebay, and the vegetated filter.
x 15. The required dimensions of the system are provided,' per the approved
plan.
cc: NCDENR-DWQ Washington Regional Office
Elizabeth City Building Inspections
Page 9 of 9

February 22, 2013
Mr. Scott Vinson
Dept. of Environment and Natural Resources
Land Quality Section
943 Washington Square Mall
Washington, NC 27889
Subject: Engineer's Certification
Perkins Estates
Permit No. SW 7060410
HR Project. #050847
Dear Mr. Vinson:
Enclosed please find the following:
HYMAN
ROBEY-®
r" IVED
FEB 2 5 2013
yri -VARO
1. The original signed State Stormwater Permit Name/Ownership Change Form
2. The original of the Wet Detention Basin O & M Agreement for each of the two ponds
executed by the new owner.
3. One copy of the Bylaws of Perkins Estate Property Owners Association
4. The original Designer's Certification.
Please note that the certification is for both stormwater detention ponds; however, only half of
the subdivision has been constructed. Please note that this certification is based on the
conditions at the time Phase 1 was completed in February 2009, At that time, Hyman & Robey
performed periodic inspections and as -built surveys during construction. No homes were
present at the time of inspection.
If you have any questions, please do not hesitate to contact this office at [phone].
Sincerely,
Hyman & Robey, PC
��
Kimberly D. Hamby
Engineering Project Manager
cc: file
Phillip Harrington
P. 0. Box 339 Camden, North Carolina 27921
[phone] License C-0598
www.hymanrobey.com

"t�1V�Ll
F E 8 2 5 2013
Permit Number:
. (to be provided by DWQ)
Drainage Area Number:
WeQLrQ;1VAR0 Operation and Maintenance Agreement
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 a lication.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.4
Page I of 4

Permit Number:
(to be provided by DPVQ)
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 '
ama ed.
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-RevA 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 re air. if a licable
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 3.0 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 2.25 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom Elevatio
2.75
---------------
FOREBAY
BASIN DIAGRAM
(fill in the blanks)
1 Volume
-ft Min.
Sediment
Storage
Permanent Pool Elevation 5.0
Pool
`------Sediment Removal Elevation 2-0------------ Volum
---------------
Bottom Elevation 1_0
MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 4
1-ft n.
Sediment
Storage

Permit Number:
(to 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: Perkins Estates
BMP drainage area number: # 1
Print name: Troy Meads
Title: President, Perkins Estates Property Owners' Association, Inc.
Address: 1700 Darian Drive, Elizabeth City, NC 27909
Phon
Sign
Date
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, iflCi/tt`PCnGr , a Notary Public for the State of
lin a County of OaM,c/Pn , do hereby certify that
f W enJS personally appeared before me this 2�
day of AAa,(C- , 901 Z , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
NOTARY
PUBU
r+ x
SEAL
My commission expires 11-Z4` 20/6
Form SW401-Wet Detention Basin O&M-Rev.4
Page 4 of 4

-A�7!VLLJ
F E 8 25 2013
Permit Number:
r (to be provided by DWQ)
Drainage Area Number:
Wet Detention •Basin Operation and Maintenance Agreement
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 eresent.
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
ton
approximately six inches.
Form 5W401-Wet Detention Basin O&M-Rev.4 Page 1 of 4

Permit Number:
(to be provided by DIwQ)
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
revent future erosion roblems.
Weeds are present.
Remove the weeds, preferably by
hand. if pesticide is used, wipe it on
the elants rather than s ra in .
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 owth.
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.4 Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
SMP element:
Potentialproblem:
How 1 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. if applicable)
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 3.75 feet in the main pond, the
sediment shall be removed.
When the permanent pool depth reads 2.25 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom El
BASIN DIAGRAM
ill in the blanks)
2.75 Pe maneniN
------------ - volume
2.0 -ft Min.
Sediment
Storage
FOREBAV
Form SW401-Wet Detention Basin O&M-Rev.4
Permanent Pool Elevation 5.0
Pool
i-----_Sediment Removal Elevation 1.25-------- Volum
Bottom Elevation
MAIN POND
Page 3 of 4
1-ft n.
Sediment
Storage

Permit Number:
(to be provided by DWQ)
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: Perkins Estates
BMP drainage area number: #2
Print name: Troy Meads
Title: President, Perkins Estates Property Owners' Association, Inc.
Address: 1700 Darian Drive, Elizabeth City, NC 27909
Phone: [phone]
Signature:
Date: J- n-a 4
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, G knd6L 17�O4c_r , a Notary Public for the State of
/i , County of duy de_� , do hereby certify that
f ro V �Pa d 5 personally appeared before me this 26
day of M&ffh 2612- , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
. y
NOTARY VO
c+� PUS,
SEAL
My commission expires�{r"Z4-2dge
Form SW401-Wet Detention Basin O&M-Rev.4
Page 4 of 4

PERMANENT POOL DETENTION PONDS
DESIGN OF POND
Perkins Estates - Detention Pond 1
10 Yr, 24 Hr Storm
DETENTION POND
Hyman & Robey, PC
150-A Hwy 158 East
Camden, NC 27921
(252)-335-1888
04/05/06
Page I
SAIDA PERCENTAGES FOR 90% TSS REMOVAL WITHOUT VEGETATIVE FILTER
% I MPR V
3.0 FT
3.5 FT
4.0 FT
4.5 FT
5.0 FT
5.5 FT
6.0 FT
10%
1.3
1.0
0.8
0.7
0.6
0.5
0.4
20%
2.4
2.0
1.8
1.7
1.5
1.4
1.2
30%
3.5
3.0
2.7
2.5
2.2
1.9
1.6
40%
4.5
4.0
3.5
3.1
2.8
2.5
2.1
50%
5.6
5.0
4.3
3.9
3.5
3.1
2.7
60°Io
7.0
6.0
5.3
4.8
4.3
3.9
3.4
70%
8.1
7.0
6.0
5.5
5.0
4.5
3.9
80°lo
9.4
8.0
7.0
6.4
5.7
5.2
4.6
90%
10.7
9.0
7.9
7.2
6.5
5.9
5.2
100%
12.0
10.0
8.8
8.1
7.3
6.6
5.8
6.5 FT 7.0 FT
0.3 0.2
1.0 0.9
1.3 1.1
1.8 1.4
2.3 1.9
2.9 2.4
3.4 2.9
4.0 3.4
4.6 3.9
5.1 4.3
WATERSHED AREA:
36.36
ACRES
WATERSHED % IMPERVIOUS:
50
%
PERMANENT POOL ELEVATION:
5
FT
DESIGN PERMANENT POOL DEPTH:
5
FT
SAIDA PERCENTAGE FACTOR:
3.5
% (FROM ABOVE TABLE • TAKEN FROM OF.SIGN OF STORM WATER
POND SURFACE AREA REQ'D:
FOREBAY AREA:
AT WIDTH = 0.33 LENGTH,
WIDTH = 135.934 LF
LENGTH = 407.803 LF
CONTROL FACILITIES WORKSHOP MANUAL. PENC 1988)
55434 SF
16630 SF
(BASED UPON MINIMUM SURFACE AREA)
Use these dimensions: WIDTH 98.17 LF
LENGTH . 670 LF
VOLUME OF I" RAINFALL Normal Pool Elevation 5
AREA OF ROOFS: 10.93 AC
AREA OF PARKING/CONCRETE: 4.66 AC
AREA OF GREEN AREAS: 20.3 AC
VOLUME OF RUNOFF 70483.7 CF VOL (CF)=[(ROOF' 1.0)+(PARKING*.95)+(GRASS*0.2)1*43,560112
STORAGE DEPTH FOR MINIMUM AREA = 1.07 FT
ELEVATION OF 1 " RAINFALL = 6.07
APR 24 20LI�
g/ 4"9EA
i
INE
C. 100
rrnlln+

DRAWDOWN - WATER QUALITY
Q(2 DAYS) = 0.40789 CFS
Q(5 DAYS) = 0.16316 CFS
I" RUNOFF STAGE 1,07 FT
DEPTH OF DRAWDOWN DEVICE BELOW OUTLET 1.5 FT
1 " RUNOFF OUTLET DEVICE: 3,85398 INCH DIA HOLE
----------
DIAMETER OF HOLE TO USE: ; 4.5 INCH DIAMETER
I " STORM RUNOFF DRAWDOWN TIME, 2,09568 DAYS
A=[Q/(Cd*SQRT(2gh))]* 144
Rad.=SQRT(A/PI)
Dia.=2*Rad.
INFLOW HYDROGRAPH
Return Year Storm 10 Yr
Qp = Peak Discharge = 58 cfs
Tc = Time of Concentration = 24 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) = 1600
S =(I000/CN)-10 — 2,04819
CN = approximately same CN from TR-55 — 83
Y = avg. watershed land slope in % = 0.23
S = (1000/CN)-10 = 2.04819
L= 0.87601 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 = 0.0532 hrs
Tp = 0.90261 hrs = 54.1565 min
�'
Volume under Hydrograph = 1.39 * Qp * Tp = 261966 Cubic Feet — At =
1$S50
1
CI1ftos

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
0.09
2
565
0.20
0.10
0.18
6
1885
0.30
0.19
0.27
11
3581
0.40
0.31
0.36
18
5842
0.50
0.47
0.45
27
8858
0.60
0.66
0.54
38
12439
0.70
0.82
0.63
48
15454
0.80
0.93
0.72
54
17527
0.90
0.99
0.81
57
18658
1.00
1.00
0.90
58
18846
1.10
0.99
099
57
18658
1.20
0.93
1.08
54
17527
1.30
0.86
1.17
50
16208
1.40
0.78
1.26
45
14700
1.50
0.68
1.35
39
12816
1.60
0.56
1.44
32
10554
1.70
0.46
1.53
27
8669
1.80
0.39
1.62
23
7350
1.90
0.33
1.71
19
6219
2.00
0.28
1.81
16
5277
2.20
0.21
1.99
12
7802
2.40
0.15
2.17
9
5541
2.60
0.11
2.35
6
4033
2.80
0.08
2.53
4
2902
3.00
0.06
2.71
3
2073
3.20
0.04
2.89
2
1508
3.40
0.03
3.07
2
1093
3.60
0.02
3.25
1
.792
3.80
0.02
3.43
1
565
4.00
0.01
3.61
1
415
4.50
0.01
4.06
0
471
5.00
0.00
4.51
0
0
Volume
under hydrograph =
248830 cf
Based upon runoff volume =
261966 cf
Depth req'd for minimum area =
3.98282

STAGE STORAGE FUNCTION OF POND
Page 4
(FOR RECTANGULER DETENTION POND ONLY)
Pond Side Slope (M) _
Minimum surface area taken
at normal
water level
BASIN AREA INCR
ACCUM
VOLUME VOLUME
STAGE
In s
In Z
Z est Elevation
S
Z
sf cf
cf
ft
65774 0
0
0
Surface area at normal pool
5
68087 33465
33465
0.5
10.42
-0.69
0.58
5.5
70419 34627
68092
1
11.13
0.00
1.08
6
72768 35797
103889
1.5
11.55
0.41
1.56
6.5
75136 36976
140865
2
11.86
0.69
2.03
7
77521 38164
179029
2.5
12.10
0.92
2.50
7.5
79925 39362
218391
3
12.29
1.10
2.97
8
82346 40568
258959
3.5
12.46
1.25
3.44
8.5
84786 41783
300742
4
12.61
1.39
3.92
9
87243 43007
343749
4.5
12.75
1.50
4.40
9.5
89719 44241
387990
5
12.87
1.61
4.89
10
Regression Output:
Constant
9.34346
Ks = SIZ^b = 62292.8
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)
STAGE DISCHARGE
(FOR RISER/BARRELL SPILLWAY W EMERGENCY WEIR)
RISER
Dr =
18
Riser Dia. (in)
Etop -
20.00
Elev. Top Riser (ft)
Cwr =
3.33
Riser weir coeff
Cdr =
0.60
Riser orifice coeff
H l n =
5
Number of Holes
Hid =
2
Hole Dia. (in)
EH =
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 W
15
Barrel Dia. (in)
Einv
9.50
Elev Invert Barrel (ft)
Cdb =
0.60
Barrel orifice coeff
8,98
Barrell Adjustment Factor
3

EMERGENCY WEIR
Page 5
Cw = 3 Weir coeff
Ecr = 6.07 Elev weir coeff (ft)
Lw = 5 Weir Length (ft)
Riser
Riser
Riser
Elevation
Hole
Hole
Hole
Riser
Riser
Barrel
(1)
(2)
(3)
(weir)
(orifice)
5.00
0.0
0.0
0.0
0.0
0.0
0.0
5.00
0.0
0.0
0.0
0.0
0.0
0.0
5.02
0.0
0.0
0.0
0.0
0.0
0.0
5.06
0.0
0.0
0.0
0.0
0.0
0.0
5.13
0.0
0.0
0.0
0.0
0.0
0.0
5.24
0.0
0.0
0.0
0.0
0.0
0.0
5.38
0.0
0.0
0.0
0.0
0.0
0.0
5.58
/ O.o
0.0
0.0
0.0
0.0
0.0
5.81
0.0
0.0
0.0
0.0
0.0
0.0
6.05
0.0
0.0
0.0
0.0
0.0
0.0
6.31
0.0
0.0
0.0
0.0
0.0
0.0
6.55
0.0
0.0
0.0
0.0
0.0
0.0
6.77
0.0
0.0
0.0
0.0
0.0
0.0
6.95
0.0
0.0
0.0
0.0
0.0
0.0
7.11
0.0
0.0
0.0
0.0
0.0
0.0
7.22
0.0
0.0
0.0
0.0
0.0
0.0
7.31
0.0
0.0
0.0
0.0
0.0
0.0
7.36
0.0
0.0
0.0
0.0
0.0
0.0
7.37
0.0
0.0
0.0
0.0
0.0
0.0
7.38
0.0
0.0
0.0
0.0
0.0
0.0
7.36
0.0
0.0
0.0
0.0
0.0
0.0
7.32
0.0
0.0
0.0
0.0
0.0
0.0
7.25
0.0
0.0
0.0
0.0
0.0
0.0
7.16
0.0
0.0
0.0
0.0
0.0
0.0
7.07
0.0
0.0
0.0
0.0
0.0
0.0
6.99
0.0
0.0
0.0
0.0
0.0
0.0
6.90
0.0
0.0
0.0
0.6
0.0
0.0
6.83
0.0
0.0
0.0
0.0
0.0
0.0
6.76
0.0
0.0
0.0
0.0
0.0
0.0
6.70
0.0
0.0
0.0
0.0
0.0
0.0
6.64
0.0
0.0
0.0
0.0
0.0
0.0
6.52
0.0
0.0
0.0
0.0
0.0
0.0
6.43
0.0
0.0
0.0
0.0
0.0
0,0
Principal Emergcy
Spillway Weir
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1.7
5.0
8.8
12.5
15.8
18.6
20.7
21.9
22.3
22.4
22.0
20.9
19.1
17.1
15.1
13.2
'11.4
9.9
8.6
7.5
6.5
4.5
3.2
'1111011tC i 104`1V

ROUTING OF INFLOW HYDROGRAPH THROUGH POND AND OUTFLOW DEVICE
Page 6
Total
Riser
Riser
Riser
Barrel
Emerg
Time
Inflow
Storage
Stage
Outflow
Holes
(weir)
(orifice)
Spillway
t (hr)
cfs
cf
Elevation
cfs
(1+2+3)
cfs
cfs
cfs
cfs
cfs
0,000
0
0
5.00
0.00
0.00
0.00
0.00
0.00
0.00
0.090
2
0
5.00
0.00
0.00
0.00
0.00
0.00
0.00
0.181
6
565.394
5.02
0.00
0.00
0.00
0.00
0.00
0.00
0,271
11
2450.04
5.06
0.00
0.00
0.00
0.00
0.00
0.00
0.361
18
6030.87
5.13
0.00
0.00
0.00
0.00
0.00
0.00
0.451
27
11873.3
5.24
0.00
0.00
0.00
0.00
0.00
0.00
0.542
38
20731.1
5.38
0.00
0.00
0.00
0.00
0.00
0.00
0.632
48
33169.8
5.58
0.00
0.00
0.00
0.00
0.00
0.00
0.722
54
48623.9
5.81
0.00
0.00
0.00
0.00
0,00
0.00
0.812
57
66151.1
6.05
0.00
0.00
0.00
0.00
0.00
0.00
0,903
58
84809.1
6.31
1.73
0.00
0.00
0.00
0.00
1.73
0.993
57
103093
6.55
4,96
0.00
0.00
0.00
0.00
4.96
1.083
54
120138
6.77
8.75
0.00
0.00
0.00
0.00
8.75
1.173
50
134820
6.95
12.48
0.00
0.00
0.00
0.00
12.48
1.264
45
146974
7.11
15.83
0.00
0.00
0.00
0.00
15.83
1.354
39
156530
7.22
18.62
0.00
0.00
0.00
0.00
18.62
1,444
32
163296
7.31
20.67
0.00
0.00
0.00
0.00
20,67
1.534
27
167135
7.36
21,85
0.00
0.00
0.00
0.00
21.85
1.625
23
168703
7.37
22.35
0.00
0.00
0.00
0.00
22.35
1.715
19
168792
7.38
22.37
0.00
0.00
0.00
0.00
22.37
1.805
16
167742
7.36
22:04
0.00
0.00
0.00
0.00
22.04
1.986
12
163970
7.32
20.87
0.00
0.00
0.00
0.00
20.87
2.166
9
158207
7.25
19.12
0.00
0.00
0.00
0.00
19.12
2.347
6
151322
7.16
17.08
0.00
0.00
0.00
0.00
17,08
2.527
4
144254
7.07
15.06
0.00
0.00
0.00
0.00
15.06
2.708
3
137369
6.99
13.16
0.00
0.00
0.00
0.00
13.16
2.888
2
130889
6.90
11.44
0.00
0.00
0,00
0.00
11.44
3,069
2
124959
6.83
9.93
0.00
0.00
0.00
0.00
9.93
3.249
1
119596
6.76
8.62
0.00
0.00
0.00
0.00
8.62
3.430
1
114783
6.70
7.50
0.00
0.00
0.00
0.00
7.50
3,610
1
110476
6.64
6.53
0.00
0.00
0.00
0.00
6.53
4.062
0
100907
6.52
4.53
0.00
0.00
0.00
0.00
4.53
4.513
0
94023.9
6.43
3.23
0.00
0.00
0.00
0.00
3.23
7.37545 = maximum stage elevation
22.3733 = maximum discharge
1 t=u -
��NQINEEP r
���rrrr�lnn+►���`

Perkins Estates
Pasquotank County
10 yr STORM
70
F y �
60
50 �o1 `r }ki Y
> d
40
Y Fyn' } {s 4s<'. —®— INFLOW (cfs)
o.... OUTFLOW (cfs)
20
10
!fi JJ!���i' i ��1 �1;�i��.,[� �.� '�j -•.�! �`'+y FI�I�'�. yam'` `F{+d�'�
.�iLi.`.'J 3. A.. {r4'�1�t4Y`tt�..s�,.ei. 4�a'© �m�j�"A'h_`"�:{{,1�'4� • '�
0 - 7ff60�000ir--.....—......'—'—,....—^ems.."'^--v—^�
0.000 1.000 2.000 3.000 4.000 5.000
Time (hrs)
sFgN cot��1
11110 R ���

POND VOLUME CALCULATIONS
FOR
S:Wyman & Robey '051050847 - Perkins Lane PropertylExce71050847 - (DRY) POND #1 VOLUME CALCULATION.Xls
POND CALCULATIONS
AREA F2
PERMANENT POOL SURFACE AREA
MAIN BASIN SURFACE AREA
FOREBAY SURFACE AREA
AREA AT EDGE OF MAIN BASIN SHELF
AREA OF MAIN BASIN BOTTOM
AREA AT EDGE OF FOREBAY SHELF
AREA OF FOREBAY BOTTOM
SURFACE AREA AT 1" STORAGE
ELEVATIONS
PP ELEVATION
ELEVATION AT EDGE OF MAIN BASIN SHELF
ELEVATION OF MAIN BASIN BOTTOM
ELEVATION AT EDGE OF FOREBAY SHELF
ELEVATION OF FOREBAY BOTTOM
ELEVATION OF 1" STORAGE
65.777.64
K� +.19;058.
,28;168.06=
1 Q 51.1s74F
70;616:89a' ':"
F
VOLUME CALCULATIONS F3
MAIN BASIN VOLUME 179,364.90
FOREBAY VOLUME 42,346.24
PERMANENT POOL VOLUME 221,711.14
FOREBAY PERCENTAGE OF TOTAL PERMANENT POOL VOLUME 19.10%
TEMP. STORAGE VOLUME (1" RUNOFF) 72,971.07
TEMPORARY STORAGE OFFSET
SLOPE (EX: IF 3:1 ENTER 3)�" m'
OFFSET FROM PP 3.21
BASIN DIAGRAM CALC
MAIN POND
SEDIMENT REMOVAL ELEVATION
PP DEPTH READS ... SEDMENT SHALL BE REMOVED
FOREBAY
SEDIMENT REMOVAL ELEVATION
PP DEPTH READS ... SEDMENT SHALL BE REMOVED
•SX
1.25
3.75
4/5/2006 12:14 PM PAGE 1 OF 1

�cx
110
4 4 (3 3 G C6-S
_
110
4 4 (3 3 G C6-S
_

PERMANENT POOL DETENTION PONDS
DESIGN OF POND
Perkins Estates - Pond 2
10 Yr, 24 Hr Storm
DETENTION POND
Hyman & Robey, PC
150-A Hwy 158 East
Camden, NC 27921
(252)-335-1888
04/05/06
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
10%
1.3
1.0
0.8
0.7
0.6
0.5
0.4
20%
2.4
2.0
1.8
1.7
1.5
1.4
1.2
30%
3.5
3.0
2.7
2.5
2.2
1.9
1.6
40%
4.5
4.0
3.5
3.1
2.8
2.5
2.1
50%
5.6
5.0
4.3
3.9
3.5
3.1
2.7
60%
7.0
6.0
5.3
4.8
4.3
3.9
3.4
70%
8.1
7.0
6.0
5.5
5.0
4.5
3.9
80%
9.4
8.0
7.0
6.4
5.7
5.2
4.6
90%
10.7
9.0
7.9
7.2
6.5
5.9
5.2
100%
12.0
10.0
8.8
8.1
7.3
6.6
5.8
6.5 FT
0.3
1.0
1.3
1.8
2.3
2.9
3.4
4.0
4.6
5.1
Page 1
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: 6.3 ACRES
WATERSHED % IMPERVIOUS: 50 %
PERMANENT POOL ELEVATION: 5 FT
DESIGN PERMANENT POOL DEPTH: 4 FT
SAIDA PERCENTAGE FACTOR: 4.3 % (FROM ABOVE TABLE -TAKEN FROM DESIGN OF STORM WATER
POND SURFACE AREA REQ'D:
FOREBAY AREA:
AT WIDTH = 0.33 LENGTH,
WIDTH = 62.7174 LF
LENGTH = 188.152 LF
CONTROL FACILITIES WORKSHOP MANUAL - PENC 1988)
11800 SF
3540 SF
(BASED UPON MINIMUM SURFACE AREA)
Use these dimensions: WIDTH 53.18 LF
LENGTH 370 LF
VOLUME OF 1 " RAINFALL Normal Pool Elevation 5
AREA OF ROOFS: 2.25 AC
AREA OF PARKING/CONCRETE: AC
AREA OF GREEN AREAS: 4.52 AC
VOLUME OF RUNOFF 11449 CF VOL (CF)=((ROOF*1.0)+(PARKING*.95)+(GRASS*0.2)]*43,550112
STORAGE DEPTH FOR MINIMUM AREA = 0.58 FT
ELEVATION OF 1" RAINFALL = 5.58
REGE L! ETE'D'
APR ? I M06
D v,y-vvY:K�L
EAL
18550
i • � �FNQ1Nt;EP r
s
/% 1� 4#rClntt4��y\\\`\`\`

DRAWDOWN - WATER QUALITY
Q(2 DAYS) = 0.06626 CFS
Q(5 DAYS) = 0.0265 CFS
I" RUNOFF STAGE 0.58 FT
DEPTH OF DRAWDOWN DEVICE BELOW OUTLET 1.5 FT
1 " RUNOFF OUTLET DEVICE: 1.80948 INCH DIA HOLE
DIAMETER OF HOLE TO USE: 2.125 INCH DIAMETER
1" STORM RUNOFF DRAWDOWN TI 2.07167 DAYS
INFLOW HYDROGRAPH
Return Year Storm 10 Yr
Qp = Peak Discharge = 13.61 cfs
Tc = Time of Concentration =
Calculation of Tp (Time to Peak)
From SCS NEH 4, page 15-7 Eqn. 15.4
A= [Q/(Cd *S QRT(2 gh)) I * 144
Rad.=SQRT(A/PI)
Dia.=2*Rad.
9.3 min
Lag Time (L) = (1^0.8*(S+1)"0.7)/(1900*Y^0.5) for Lin Hrs
where: 1 = 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 = 1.90476
L= 0,30276 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 = 0.02062 hrs
Tp = 0,31307 hrs = 18.784 min
Volume under Hydrograph = 1.39 * Qp * Tp = 21321.3 Cubic Feet
.625
1.90476
84
0.4
AL _
16550
YQINr

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
46
0.20
0.10
0.06
1
153
0.30
0.19
0.09
3
291
0.40
0.31
0.13
4
476
0.50
0.47
0.16
6
721
0.60
0.66
0.19
9
1012
0.70
0.82
0.22
11
1258
0.80
0.93
0.25
13
1427
0.90
0.99
0.28
13
1519
1.00
1.00
0.31
14
1534
1.10
0.99
0.34
13
1519
1.20
0.93
0.38
13
1427
1.30
0.86
0.41
12
1319
1.40
0.78
0.44
11
1196
1.50
0.68
0.47
9
1043
1.60
0.56
0.50
8
859
1.70
0.46
0.53
6
706
1.80
0.39
0.56
5
598
1.90
0.33
0.59
4
506
2.00
0.28
0.63
4
429
2.20
0.21
0.69
3
635
2.40
0.15
0.75
2
451
2.60
0.11
0.81
1
328
2.80
0.08
0.88
1
236
3.00
0.06
0.94
1
169
3.20
0.04
1.00
1
123
3.40
0.03
1.06
0
89
3.60
0.02
1.13
0
64
3.80
0.02
1.19
0
46
4.00
0.01
1.25
0
34
4.50
0.01
1.41
0
38
5.00
0.00
1.57
0
0
Volume
under hydrograph =
20252 cf
Based upon runoff volume =
21321.3 cf
Depth req'd for minimum area =
1.08358

STAGE STORAGE FUNCTION OF POND
Page 4
(FOR RECTANGULER DETENTION POND ONLY)
Pond Side Slope (M) _
Minimum surface area taken at normal water level
BASIN AREA INCR
ACCUM
VOLUME VOLUME
STAGE
In s
In Z
Z est Elevation
S
Z
sf cf
cf
ft
19677 0
0
0
Surface area at normal pool
5
20955 10158
10158
0.5
9.23
-0.69
0.56
5.5
22252 10802
20960
1
9.95
0.00
1.04
6
23566 11454
32414
1.5
10.39
0.41
1.52
6.5
24899 12116
44530
2
10.70
0.69
2.01
7
26249 12787
57317
2.5
10.96
0.92
2.50
7.5
27618 13467
70784
3
11.17
1.10
3.00
8
29004 14156
84940
3.5
11.35
1.25
3.52
8.5
30409 14853
99793
4
11.51
1.39
4.05
9
31831 15560
I15353
4.5
11.66
1.50
4.59
9.5
33272 16276
131629
5
11.79
1.61
5.14
10
Regression Output:
Constant
9.34346
Ks = S/Z^b
= 19943.45
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)
STAGE DISCHARGE -
(FOR RISER/BARRELL SPILLWAY W EMERGENCY WEIR)
RISER
Dr =
18
Riser Dia. (in)
Etop =
20.00
Elev. Top Riser (ft)
Cwr =
3.33
Riser weir coeff
Cdr =
0.60
Riser orifice coeff
H 1 n =
5
Number of Holes
Hld =
2
Hole Dia. (in)
EH I -
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 =
9.50
Elev Invert Barrel (ft)
Cdb =
0.60
Barrel orifice coeff
6.08
3
ty/{SEAT. _
`7f 18550
F'4N C. RW
Barrell Adjustment Factor

EMERGENCY WEIR
Page 5
Cw
3
Weir coeff
Ecr
=
5.58
Elev weir coeff (ft)
Lw
=
1
Weir Length (ft)
Riser
Riser
Riser
Elevation
Hole
Hole
Hole
Riser Riser
Barrel
Principal
Emergcy
(I)
(2)
(3)
(weir) (orifice)
Spillway
Weir
5.00
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.00
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.01
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.02
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.04
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.07
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.12
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.18
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.25
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.32
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.40
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.47
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.55
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5.61
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.0
5,68
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.1
5.73
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.2
5.78
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.3
5.81
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.3
5.84
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.4
5.87
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.5
5.89
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.5
5.92
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.6
5.94
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.96
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.96
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.97
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.97
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.97
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.96
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.96
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.95
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.7
5.94
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.6
5.93
0.0
0.0
0.0
0.0
0.0
0.0
0.00
0.6
SEAL _-
18560
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ROUTING OF INFLOW HYDROGRAPH THROUGH POND AND OUTFLOW DEVICE
Page 6
Total
Riser
Riser
Riser
Barrel
Emerg
Time
Inflow
Storage
Stage
Outflow
Holes
(weir)
(orifice)
Spillway
t (hr)
cfs
cf
Elevation
cfs
(1+2+3)
cfs
cfs
cfs
cfs
cfs
0.000
0
0
5.00
0.00
0.00
0.00
0.00
0.00
0.00
0.031
0
0
5.00
0.00
0.00
0.00
0.00
0.00
0.00
0.063
1
46.0171
5.01
0.00
0.00
0.00
0.00
0.00
0.00
0.094
3
199,407
5.02
0.00
0.00
0.00
0.00
0.00
0.00
0.125
4
490.849
5.04
0.00
0.00
0.00
0.00
0.00
0.00
0.157
6
966.359
5.07
0.00
0.00
0.00
0.00
0.00
0.00
0.188
9
1687.29
5.12
0.00
0.00
0.00
0.00
0.00
0.00
0.219
11
2699.67
5.18
0.00
0.00
0.00
0.00
0.00
0.00
0.250
13
3957.47
5.25
0.00
0.00
0.00
0.00
0.00
0.00
0.282
13
5384
5.32
0.00
0.00
0.00
0.00
0.00
0.00
0.313
14
6902.56
5.40
0.00
0.00
0.00
0.00
0.00
0.00
0.344
13
8436.47
5.47
0.00
0.00
0.00
0.00
0.00
0.00
0.376
13
9955.03
5.55
0.00
0.00
0.00
0.00
0.00
0.00
0.407
12
11381.6
5.61
0.02
0.00
0.00
0.00
0.00
0.02
0,438
11
12698.5
5.68
0.09
0.00
0.00
0.00
0.00
0.09
0.470
9
13885
5.73
0.17
0.00
0.00
0.00
0.00
0.17
0.501
8
14908.3
5.78
0.26
0.00
0.00
0.00
0.00
0.26
0.532
6
15737.8
5.81
0.34
0.00
0.00
0.00,
0.00
0.34
0.564
5
16405
5.84
0.41
0.00
0.00
0.00
0.00
0.41
0.595
4
16957.4
5.87
0.47
0.00
0,00
0.00
0.00
0.47
0.626
4
17411.1
5.89
0.51
0.00
0.00
0.00
0.00
0.51
0.689
3
18154.1
5.92
0.60
0.00
0.00
0.00
0.00
0.60
0.751
2
18654.1
5.94
0.66
0.00
0.00
0.00
0.00
0.66
0.814
1
18956.7
5.96
0.69
0.00
0.00
0.00
0.00
0.69
0,877
1
19128.5
5.96
0.72
0.00
0.00
0.00
0.00
0.72
0,939
1
19203.6
5.97
0.72
0.00
0.00
0.00
0.00
0.72
1.002
1
19209
5.97
0.72
0.00
0.00
0.00
0.00
0.72
1.064
0
19168.3
5.97
0.72
0.00
0.00
0.00
0.00
0.72
1.127
0
19095
5.96
0.71
0.00
0.00
0.00
0.00
0.71
,190
0
18999.2
5.96
0.70
0.00
0.00
0.00
0.00
0.70
1.252
0
18887.6
5.95
0.69
0.00
0.00
0.00
0.00
0.69
1.409
0
18585.4
5.94
0.65
0.00
0.00
0.00
0.00
0.65
1.565
0
18257.7
5.93
0.61
0.00
0.00
0.00
0.00
0.61
5.96796 = maximum stage elevation
0,72494 = maximum discharge
�g550
OVG
�% ",&4111 IC

Perkins Estates - Pond #2
Pasquotank County
10 yr STORM
16
14
12��s: :, Fib ' ,� �l• �� �S b� ��� ra r r ��
10
,�V• Til— INFLOW (cfS)
8
OUTFLOW (cfs)
��sY y u #�� RyJ-{•j -0' 1$'6""C.�S�'_1..,q,. it � ,
0
0.000 0.500 1.000 1.500 2.000
Time (hrs)
1kt
i eP • �'��, Q1NE�P ��� �� <

POND VOLUME CALCULATIONS
FOR
S: ftrnan & Robey '051050847 - Perkins Lane PropertylExcei1050847 - (DRY) POND##2 VOLUME CALCULATION -xis
POND CALCULATIONS
AREA F2
PERMANENT POOL SURFACE AREA
MAIN BASIN SURFACE AREA
FOREBAY SURFACE AREA
AREA AT EDGE OF MAIN BASIN SHELF
AREA OF MAIN BASIN BOTTOM
AREA AT EDGE OF FOREBAY SHELF
AREA OF FOREBAY BOTTOM
SURFACE AREA AT 1" STORAGE
ELEVATIONS
PP ELEVATION
ELEVATION AT EDGE OF MAIN BASIN SHELF
ELEVATION OF MAIN BASIN BOTTOM
ELEVATION AT EDGE OF FOREBAY SHELF
ELEVATION OF FOREBAY BOTTOM
ELEVATION OF 1' STORAGE
VOLUME CALCULATIONS
ZA 4,451.
9,224.28
6,001.94
2,766.26
1,839.81
21,023.06
F
5.00
3.33
1.00
3.33
2.00
5.58
F3
MAIN BASIN VOLUME 37,507.90
FOREBAY VOLUME 9,735.22
PERMANENT POOL VOLUME 47,243.12
FOREBAY PERCENTAGE OF TOTAL PERMANENT POOL VOLUME 20.61 %
TEMP. STORAGE VOLUME (1" RUNOFF) 11,802.72
TEMPORARY STORAGE OFFSET
SLOPE (EX: IF 3:1 ENTER 3)
OFFSET FROM PP 1.74
BASIN DIAGRAM CALC
MAIN POND
SEDIMENT REMOVAL ELEVATION 2.00
PP DEPTH READS ... SEDMENT SHALL BE REMOVED 3.00
FOREBAY
SEDIMENT REMOVAL ELEVATION �2.75
PP DEPTH READS ... SEDMENT SHALL BE REMOVED `� ��Y '�2.25
— iassa
fC.l `Vol$
4/1212006 10:40 AM PAGE 1 OF 1

A-CL-
HI
0,
(o
3. ce
(o
56 33
IS -
% 1.
SEAL---:—=
18550
e4Af c.

April 12, 2006
Dept. of Environment and Natural Resources
943 Washington Square Mall
Washington, NC 27889
Subject: Express Permitting
Perkins Estates
Project # 050847
To Whom It May Concern:
I hereby grant authority to Down East Developers of NC, LLC to apply for
sediment and erosion control permits and storm water permits on the behalf of Perkins
Lane, LLC. Perkins Estates is owned by both companies and I am the registered agent for
both.
If you have any questions or require additional information, please contact Hyman
and Robey, PC at [phone].
Sincerely,
P """ f
Phillip W. Harrington
APR 2 4 2006
DYVQ_WARO