SW7071105_CURRENT PERMIT_20210512

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW Ydl
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
�_,CA �
YYYYMMDD

ti'l G"
ROY COOPER
Governor
DIONNE DELLI-GATTI
Secretory
BRIAN WRENN NORTH CAROLINA
Duvcmr Environmental Quality
May 12, 2021
Currituck County
Attention: Ben Stikeleather, Manager
153 Courthouse Rd., St. 204
Currituck, NC 27929
Subject: Stormwater Permit No. SW7071105 Renewal
Mainland Water Treatment Plant
High Density Project
Currituck County
Dear Mr. Stikeleather:
The Washington Regional Office received a Stormwater Management Permit
Application for renewal of the subject permit on April 9, 2021. Staff review of the
application has determined that the permit can be reissued. We are forwarding Permit
No. SW7071105 dated May 12, 2021, for the continued operation of the existing
stormwater system.
This permit, upon its effective date, will replace all previous State Stormwater permits for
this project. This permit shall be effective from March 6, 2022 until March 5, 2030 and
shall be subject to the conditions and limitations as specified therein, and does not
supercede any other agency permit that may be required. Please pay special attention to
the Operation and Maintenance requirements in this permit. Failure to establish an
adequate system for operation and maintenance of the stormwater management system
will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you
have the right to request an adjudicatory hearing upon written request within thirty (30)
days following receipt of this permit. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714.
Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please
contact me at [phone].
Sincerely,
Roger K. Thorpe
Environmental Engineer
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional Office 1943 Washington Square Mall I Washington, North Carolina 27889
TM
252946.6481

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North
Carolina as amended, and other applicable Laws, Rules and Regulations
PERMISSION IS HEREBY GRANTED TO
Currituck County
Mainland Water Treatment Plant
Located at 446 Maple Road, Maple, NC
FOR THE
construction, operation and maintenance of a wet detention pond in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and
the approved stormwater management plans and specifications and other supporting
data as attached and on file with and approved by the Division of Energy, Mineral, and
Land Resources (Division) and considered a part of this permit.
This permit shall be effective from March 6, 2022 until March 5, 2030, and shall be
subject to the following specified conditions and limitations:
I. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.6 of this permit. The stormwater control has
been designed to handle the runoff from 50,415 square feet of impervious area.
3. 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.
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
252.946.6481
romvuxuw

U
I
91
1
2.
The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system per
approved plans.
The tract will be limited to the amount of built upon area indicated in Section 1.6
of this permit and per the approved plans.
The following design criteria have been provided in the wet detention pond and
must be maintained at design condition:
a.
Drainage Area, acres:
2.05
b.
Total Impervious Surfaces, ftz:
50,415
C.
Design Storm, inches:
1.0
d.
Pond Depth, feet:
5.5
e.
TSS removal efficiency:
90%
f.
Permanent Pool Elevation, FMSL:
11.5
g.
Permanent Pool Surface Area, ft2:
4,262
h.
Permanent Storage Volume, ft3:
4,465
i.
Permitted Forebay Volume, ft3:
1,764
j.
Temporary Storage Elevation, FMSL:
12.45
k.
Controlling Orifice:
1.0" � pipe
I.
Receiving Stream/River Basin:
North River / Pasquotank
M.
Stream Index Number:
30-2
n.
Classification of Water Body:
"SC"
II. SCHEDULE OF COMPLIANCE
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.
During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
a
Washington Regional Office 1 943 Washington Square Mall I Washington. North Carolina 27889
252.946.6481

The permittee shall at all times provide the operation and maintenance
necessary to assure the permitted stormwater system functions at optimum
efficiency. The approved Operation and Maintenance Plan must be followed in its
entirety and maintenance must occur at the scheduled intervals including, but not
limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and
specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow
spreader, catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon
request to authorized personnel of the Division. The records will indicate the
date, activity, name of person performing the work and what actions were taken.
5. The facilities shall be constructed as shown on the approved plans. This permit
shall become voidable unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other
supporting data.
6. Upon completion of construction, prior to issuance of a Certificate of Occupancy,
and prior to operation of this permitted facility, a certification must be received
from an appropriate designer for the system installed certifying that the permitted
facility has been installed in accordance with this permit, the approved plans and
specifications, and other supporting documentation. Any deviations from the
approved plans and specifications must be noted on the Certification. A
modification may be required for those deviations.
7. 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.
8. Access to the stormwater facilities shall be maintained via appropriate
easements at all times.
9. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to any item shown on the approved plans, including the
stormwater management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the
drainage area.
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
wam uaww
°��•��� 282.946.6481

e. Further subdivision, acquisition, lease or sale of all or part of the project
area. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval or a CAMA
Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
10. The permittee shall submit final site layout and grading plans for any permitted
future areas shown on the approved plans, prior to construction.
11. 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.
12. 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.
13. Decorative spray fountains will not be allowed in this stormwater treatment
system.
III. GENERAL CONDITIONS
This permit is not transferable except after notice to and approval by the Director.
In the event of a change of ownership, or a name change, the permittee must
submit a formal permit transfer request to the Division, accompanied by a
completed name/ownership change form, documentation from the parties
involved, and other supporting materials as may be appropriate. The approval of
this request will be considered on its merits and may or may not be approved.
The permittee is responsible for compliance with all permit conditions until such
time as the Division approves the transfer request.
2. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to enforcement action by the Division, in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state, and federal) having jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by this Division, such as the construction of
additional or replacement stormwater management systems.
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
if _ Washington Regional Office 1943 Washington Square Mall I Washington, North Carolina 27889
�c+ec w 252,9466481

5. The permittee grants DEQ Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted
stormwater management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and reissuance or
termination does not stay any permit condition.
7. Unless specified elsewhere, permanent seeding requirements for the stormwater
control must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
8. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
9. The permittee shall notify the Division of any name, ownership or mailing
address changes within 30 days.
10. This permit shall be effective from March 6, 2022 until March 5, 2030.
Application for permit renewal shall be submitted 180 days prior to the expiration
date of this permit and must be accompanied by the processing fee.
Permit issued this the 12 th day of May 2021.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Permit Number SW7071105
North Carolina Department of Environmental Quality I Division of Energy. Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
omH ow w
-\/ 252.9466481

ntMLK LISI- ONLY
Date Received
Fee Paid
Permit Number
2-
05, 00
,S Lv
NC DEQ Division of Energy, Mineral and Land Resourc
STATE STORMWATER: F�AP
PERMITRENEWAL APPLICATION FORM0 9 2021 lU
In accordance with 15A NCAC 21-1.1045(3), the current permit holder shall renew their high d�
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
1. State Stormwater Permit Number: SW7071105
2. Project name: Mainland Water Treatment Plant RO Expansion-Currituck County
3. Project street address: 446 Maple Rd.
City: Made County: Currituck County
ZIP: 27956
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 fora Major
Modification or Minor Modification Application form available at: httos //dea nc.gov/abouUdivisions/energy-
mineral-land-resou rces/energv-mineral-land-rules/stormwater-program/post-construction.
B. PERMITTEE INFORMATION
If changes to the permittee or project name have been made, please complete either the Permit Update form
or the Permit 7 ransfer form available at: https //deg nc gov/abouUdivisions/energv-mineral-land-
resources/energv-mineral-land-rules/stormwater-program/post-construction. State StormwaterPermits do not
automatically transfer with the sale of the property. ( nj� /1�� �,
1. Current Permit Holder's Company Name/Organization: II�M/L'f� l r— Wku�
2. Signing Official's Name: 2>PI`l S-I kel2q-her
3.
4.
Signing Official's Title:
Mailing Acdr ess: I E
City: Om t-N
5. StreetAdcress: 1'�'
City: Lurr i-UC
6. Phone: (1�) 2aL-
Stormwater Permit Fenewal Form Page 1 of 3 May 11, 2018

C. SUBMITTAL REQUIREMENTS
Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR
Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQW/ORWJ. 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:
6' 1. A permit application processing fee of $505.00 payable to NCDEQ.
05 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 otter 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 feral recorded deed restrictions
and protective covenants will be submitted at a later date.
435 4. O&M Agreements, Please select one:
❑ I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to
keep this on file with the permit; or
[� 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.
435 5. Designer Certifications, Please select one:
[j A copy of the certification(s) confirming that the project was built in accordance with the
approved plans have been previously provided to the Division; or
❑ A copy of the certification(s) confirming that the project was built in accordance with the
approved plans are enclosed; or
❑ The project has not yet been built.
6. [IF APPLICABLE] If the project has been built, one original hard.cooy 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 2H. 1043(3)(b).
https://www.sosnc.gov/ontine services/search/by title/ Business Registration
Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018

D. PE(fR�MITT�EE'S CERTIFICATION
D (1 k� ( e0-�-er_ the person legally responsible for the permit, certify that I have
a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am
responsible for the performance of the maintenance procedures, and the site has been and will be maintained
according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs
or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the
project, SCMs. or ownership All information provided on this permit renewal application is, to the best of my
knowledge, co�re,'cct and co plete.
Signature: .�/ Date. ' I Z I
NOTARIZATION: I, Siclma&ha ! � � vY1
• Fyou-S a Notary Public for the State of
WOO Carolina County of (`,UrOUC K , do hereby certify
that n S 161ea-liwr personally appeared before me
this the 1-7" 1 day of March 20 9-1 and acknowledge the due
ex tr ment. Witness my hand and official seal,
SAMANTHA M. EVANS
Notary Public. North Carclina
Currituck County
( fary Sa9tit;ommission Expires
My commission expiresa / 13I.
County Of Currituck
I hereby cmtlb Qwl ero aDoa aooa, ana „rvioe,, aeve
ti s rec''ei"/d Were In a=adv•xoeptoei•rriw,tetee
(fit!
DepwbnW G
Date �W
Stormwater Permit Renewal Applicatior Form Page 3 of 3 May 11, 2018

Wet Detention Basin Inspection 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. DEC t) 2007
This system (check one): ; ,',.,f) Itl'tw, n,
❑ does ® does not incorporate a vegetated filter at the outlet. ti t1 ' ""
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 inspection and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too
Maintain vegetation at a height of
long.
approximately six inches.

BMP element:
Potential problem:
How I will remediate theproblem:
The inlet device: pipe or
The pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the Swale if necessary to
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
possible. Remove the sediment and
sediment storage.
dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than 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 al al growth.
Cattails, phragmites or other
Remove the plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.

BMP element:
Potentialproblem:
How I will remediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and
beaver activity is present.
consult a professional to remove
beavers.
A tree has started to grow on
Consult a dam safety specialist to
the embankment.
remove the tree.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Division of
damage have occurred at the
Water Quality Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 5.0 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 3.0 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 11.50
9,00 Pe maven Pool
--------------- Volume Sediment Removal Elevation �0 Volume
.00 -ft Min. ------------------ -- --- ----- -- ---
-- -------- ------
Sediment Bottom Elevation � I-ft n
Storage Sedimer
Storage
FOREBAY MAIN POND

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.
Print name: Daniel F. Scanlon II
Title:County Manager
Address:P.O. Box 39, Currituck, NC 27929
Date: to• e-� Q71
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, 1�a-ru S • ( b &-,-+ , a Notary Public for the State of
A o w-47k taro Irn. County of CRPICie,n do hereby certify that
J/1 Vile Ifn =— personally appeared before me this
day of e76 k et- a6 p ry , and acknowledge the due execution of the
forgoing wet detention basin [maintenance requirements. Witness my hand and official
sea],
SEAL
My commission expires (, 0?7 / 69

s Permit No. Sw7071105
\ Ito be provided by DWQ)
�F WATFq
®'L� a2bul_aO
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part /I/) must be printed, filled out and submitted along with all of the required information.
IL PROJECT INFORMATION
Frolect name
Contact person
Phone number
Date
Drainage area number
18-Feb-08
II. DESIGN INFORMATION"Site Characteristics
Drainage area 88,925 ftz
Imperious area 54,070 Ili
% impervious 60 80404836 %
Design rainfall depth 1.0 in
Storage Volume: Non -SR Waters
Minimum volume required
4,465
ft3
Volume provided
15,729
ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth
in
Pre -development l-yr, 24-hr runoff
ft3
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
its
Volume provided
its
Peak Flow Calculations
Is pre/post control of the 1-yr 24-hr peak now required?
N
(Y or N)
1-yr, 24-hr rainfall depth
in
Rational C, pre -development
(unitless)
Rational C, post -development
(unitless)
Rainfall intensity 1-yr, 24-hr storm
inlhr
Pre -development 1-yr, 24-hr peak flow
ft'/sec
Post -development 1-yr, 24-hr peak flow
ft'/sec
PrelPosl l-yr, 24-hr peak flow control
ft'/sec
Basin Elevations
Basin bottom elevation
4.50
ft
Sediment cleanout elevation
550
ft
Bottom of shelf elevation
11.00
It
Permanent pool elevation
11.50
ft
Top of shelf elevation
12.00
it
Temporary pool elevation
12.45
ft
Volume and Surface Area Calculations
SAIDA ratio
4.37
limitless)
Surface area at the bottom of shelf
3005.00
ft'
Volume at the bottom of shelf
6077.00
ft3
Permanent pool, surface area required
3,903
ftZ
Permanent pool, surface area provided
4,262
ftZ
Permanent pool volume
7,343
ft3
Average depth for SAIDA tables
1722900047
it
Surface area at the top of shelf
5685
ftZ
Volume at the top of shelf
9821
f13
Farm SW401-Wet Detention Basin-Rev.3
OK
Minimum of 3 ft jegwred, Increase depth * J7;'
o n I a/2dt 'Lf aGkvk S / F�� c�veia'Ps
�.3 F. 12e%1 r '�oOCOMNfP..rr �e`�FP-r
d4�� alas/o8-.
Parts I. & 11 Design Summary. Page 1 of 2

Permit No
``.
(to be provided by DWQ)
` II. DESIGN INFORMATION
Forebay volume
1,764
@'
Forebay % of permanent pool volume
24
%
Must be approx. 20%, Adjust pond dimensions
Temporary pool, surface area provided
6,624
ft'
Drawdown Calculations
Treatment volume drawdown time
3.69
days
OK
Treatment volume discharge rate
0.01
W/s
Pre -development 1-yr, 24-hr discharge
ft3/s
Post -development 1-yr, 24-hr discharge
ft3/s
Additional Information
Diameter of orifice
1.00
in
Design TSS removal
90
%
Basin side slopes
3
:1
OK
Vegetated shelf slope
10
:1
OK
Vegetated shelf width
10
It
OK
Length of flowpath to width ratio
3
1
OK
Length to width ratio
2
1
OK
Trash rack for overflow & orifice?
Y
(Y or N)
OK
Freeboard provided
1.1
ft
OK
Vegetated filter provided?
N
(Y or N)
Design must be based on 90% TSS removal
Recorded drainage easement provided?
(Y or N)
Capures all runoff at ultimate build -out?
(Y or N)
Drain mechanism for maintenance or emergencies
Pump
Form SW401-Wet Detention Basin-Rev.3 Parts I. & 11. Design Summary, Page 2 of 2

`C Permit No.
(to be provided by DWQ)
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements
have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement
has not been met, attach justification.
Paget Plan
Initials
Sheet No.
cro
1. Plans (1" - 50' or larger) of the entire site showing: DEC 2 Q
Design at ultimate build -out,
Off -site drainage (if applicable), �+,
�1 9tl t0
Delineated D} Vf
drainage basins (include Rational C coefficient per basin), {Q-iA7
Basin dimensions,
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
G/0
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
3. Section view of the dry detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
( Jll1+
C/0
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
3.2
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
7. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
g. The supporting calculations.
A cWD
9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
• U.
10. A copy of the deed restriction.
Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 of 1

S' C-,/, 17 c S'
FINANCIAL RESPONSIBILITY/OWNERSHIPFORM
SEDIMENTATION POLLUTION CONTROL ACT"
No person may initiate any land -disturbing activity on one or more acres as covered by the Act before this
form and an acceptable erosion and sedimentation control plan have been completed and approved by the
Land Quality Section, N.C. Department of Environment and Natural Resources. (Please type or print and, if
the question is not applicable or the e-mail and/or fax information unavailable, place NIA in the blank.)
Part A. RE:
1. Project Name Mainland Water Treatment Plant Reverse Osmosis Expansion Nov 2 1 2007
2. Location of land -disturbing activity: County Currituck City or Township Maple Ap
Highway/Street 446 Maple Road Latitude 36'23'50.75" Longitude 76'01'13.12' D "W Q r��
3. Approximate date land -disturbing activity will commence: February. 2008
4. Purpose of development (residential, commercial, industrial, institutional, etc.): Municipal
5. Total acreage disturbed or uncovered (including off -site borrow and waste areas): 6:05 .
6. Amount of fee enclosed: S 300 . The application fee of $50.00 per acre (rounded up to the next acre)
is assessed without a ceiling amount (Example: a 9-acre application fee is $450).
7. Has an erosion and sediment control plan been filed? Yes No Enclosec X
8. Person to contact should erosion and sediment control issues arise during land -disturbing activity:
Name Eric Weatherly E-mail Address eweatherlv(a)co.currituck.nc.us
Telephone [phone] ext. 242 Cell # Fax # [phone]
9. Landowner(s) of Record (attach accompanied page to list additional owners):
Currituck County
[phone]
[phone]
Name
Telephone
Fax Number
P O. Box 38
153 Courthouse Road
Current Mailino
Address Current Street Address
Currituck
NC
27929 Currituck NC
27928
vlty
State
Zip 'City State
Zip
10. Deed Book No.
534
Page No. 897 Provide a copy
of the most current deed.
243
365
Note:
County is currently recombining this plat.
Part B.
1. Person(s) or firm(s) who are financially responsible for the land-distwbing activiy (Provide a
comprehensive list of all responsible parties on an attached sheet):
Currituck County eweatheriv(a)co.currituck.nc.us
Name mail Address
O Eo Cou thouse 3c

Telephone' [phone] - Fax Number" [phone]' "
2. (a) If the Financially Responsible Party is not a resident of North Carolina, give name and street address
of the designated North Carolina Agent:
Name
Current Mailing Address
City State Zip
E-mail Address
Current Street Address
City
Fax Number
State Zip
(b) If the Financially Responsible Party is a Partnership or other person engaging in business under an
assumed name, attach a copy of the Certificate of Assumed Name. If the Financially Responsible
Party is a Corporation, give name and street address of the Registered Agent:
Name of Registered Agent
Current Mailing Address
City
E-mail Address
Current Street Address
State Zip City
Fax Number
State Zip
The above information is true and correct to the best of my knowledge and belief and was provided
by me under oath (This form must be signed by the Financially Responsible Person if an individual
or his attomey-in-fact, or if not an individual, by an officer, director, partner, or registered agent with
the authority to execute instruments for the Financially Responsible Person). I agree to provide
corrected information should there be any change in the information provided herein.
Eric Weatherly County Enaineer
Type or print name Title or Authority
io�l4���
Signature Date
MQ r u (-" r 1 he r% a Notary Public of the County of 0A ry Coo
State of North Carolina, hereby certify that Fare 77 k/Paf17er" (o, appeared
personally before me this day and being duly swom. acknowledged thaj the above form was
executed by him.
Witness my hand and notarial seal, this I9"�, day of 20 C>9'
r'
I�ra� i
J
Idly commission expires