SW7070920_CURRENT PERMIT_20071113

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW �//% ZV !
DOC TYPE
CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
l
YYYYMM DD

A TF90
Michael F. Easley, Governor
��\ G
William G. Ross Jr., Secretary
® r
North Carolina Department of Environment and Natural Resources
<
Coleen H. Sullins, Director
Division of Water Quality
November 13, 2007
Mr. Peter Rascoe. Legal Council
Edenton Chowan Development Corporation
PO. Bo)ctQ3Q .
Edenton, NC 27932
Subject: Stormwater Permit No. SW7070920
Edenton-Chowan Airport Industrial Park, Phase
IIA
High Density Project
Chowan County
Dear Mr. Rascoe:
The Washington Regional Office received a complete Stormwater Management Permit
Application for Aaron Hill Harbor on September 27, 2007. Staff review of the plans and
specifications has determined that the pro)1�ect, as proposed, will comply with the Stormwater
Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW7070920
dated November 13, 2007, for the construction of the subject project.
This permit shall be effective from the date of issuance until November 13, 2017, and shall be
subject to the conditions and limitations as specified therein. Please pay special attention to
the Operation and Maintenance requirements in this permit. Failure to establish an adequate
system..for operation and maintenance of the 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 150E of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. 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 Samir Dumpor, or me at [phone].
XA
cer IHoe©`
Regional Supervisor
Surface Water Protection Section
AH/sd: J:\WPDATA\WQS\ State SW-SD\Permits — Wetlands
cc: James Bowen, PE, Hobbs, Upchurch & Associates, P.A. (PO Drawer 1929, Nags
Head, NC 27959)
,Chowan County Building Inspections
}/Washington Regional Office
Central Files
North Carolina Division of Water Quality Internet: \�tc.nc�cuteraua600rg 7�tOne
943 Washington Square Mall Phone [phone]V_orthCarolina
Washington, NC 27889 Fax [phone] a u/
`/b
An Equal Opportunity/Affrmative Action Employer -50%Recycledll0% Post Consumer Paper (/YK6 yea"

State Stormwater Management Systems
Permit No. SW7070920
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of
North Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Edenton Chowan Development Corporation
Edenton-Chowan Airport Industrial Park, Phase IIA
Chowan County
FOR THE
construction; operation and maintenance of two Extended Detention Wetlands 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
Water Quality and considered a part of this permit.
This permit shall be effective from the date of issuance until November 13, 2017, 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.
This stormwater system has been approved for the management of stormwater
runoff as described in Section 1.6 on page 3 of this permit. The stormwater
control has been designed to handle the runoff from 716,901 square feet of
impervious area in this 76.24 acres development (669,901 square feet of
impervious area within the high density portion of the project — lots 2-6 and 8-27;
and 47,000 square feet of impervious area within the low density portion of the
project — lots 1, 7 and 28) — see Attachment "A".
3. The tract will be limited to the amount of built -upon area indicated on page 3 of
this permit, and per approved plans.
4. No piping shall be allowed except those minimum amounts necessary to direct
runoff beneath an impervious surface such as a road or under driveways to
provide access to lots and the piping that is shown on the approved plans
directing stormwater tot extended detention wetland basins.
Page 2 of 9

State Stormwater Management Systems
Permit No. SW7070920
5. Runoff conveyances, such as perimeter ditches, must be vegetated with side
slopes no steeper than 3:1 (H:V)
6. 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.
7. The runoff from all built -upon area within the permitted drainage area of this
project must be directed into the permitted stormwater control system.
8. The following design criteria have been provided in the extended detention
wetlands and must be maintained at design condition:
Wetland #1 Wetland #2
a. Drainage Area, acres: 25.71 55.00
b. Total Impervious Surfaces, ftZ: 230,370 439,531
C. Design Storm, inches: 1.0 1.0
d. Wetland Forebay Depth, feet: 3.0 3.0
e. TSS removal efficiency: 85%. 85%
f. Permanent Pool Elevation, FMSL: 9.0 9.0
g. Permanent Pool Surface Area, ftZ: 19,440 37,056
h. Permitted Storage Volume, ft3: 32,426 61,168
i. Temporary Storage Elevation, FMSL: 10.5 10.5
j. Controlling Orifice: 2.5" 0 pipe 2.5" 0 pipe
k. Permitted Forebay Surface Area, ftZ: 2,695 4,899
I. Receiving Stream/River Basin: UT to Edenton Bay
M. Stream Index Number: 26-1
n. Classification of Water Body: "C; NSW"
II. SCHEDULE OF COMPLIANCE
1. The stormwater management system shall be constructed in its entirety,
vegetated and operational for its intended use prior to the construction of any
built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of
the system will be repaired immediately.
3. The permittee shall at all times provide the operation and maintenance
necessary to assure the permitted stormwater system functions at optimum
efficiency. The approved Operation and Maintenance Plan must be followed in its
entirety and maintenance must occur at the scheduled intervals including, but not
Page 3 of 9

State Stormwater Management Systems
Permit No. SW7070920 .
limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowiny 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 DWQ. The records will indicate the date,
activity, name of person performing the work and what actions were taken.
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.
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.
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.
Page 4 of 9

State Stormwater Management Systems
Permit No. SW7070920
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. This permit shall be effective from the date of issuance until November 13, 2017.
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.
14. Each lot in the subdivision covered by this permit will maintain a minimum 30 foot
wide vegetative buffer between all impervious areas and surface waters. All roof
drains must terminate at least 30' from the Mean High Water mark.
15. Deed restrictions are incorporated into this permit by reference and must be
recorded with the Office of the Register of Deeds prior to the sale of any lot.
16. Recorded deed restrictions must include, at a minimum, the following statements
related to stormwater management:
a. The following covenants are intended to ensure onggoing compliance with
State Stormwater Management Permit Number SW7070920, as issued by
the Division of Water Quality 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 Water Quality.
e. Alteration of the drainage as shown on the approved plans may not take
place without the concurrence of the Division of Water Quality.
f. The maximum built -upon area per lot is (see BUA Per Lot table) square
feet. These allotted amounts include 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, driveways, and parking areas, but does not include
raised, open wood decking, or the water surface of swimming pools.
g. Filling in, piping or altering any 3:1 vegetated conveyances (ditches,
swales, etc.) associated with the development except for average
driveway crossings, is prohibited by any persons.
h. Filling in, piping or altering any designated vegetated area associated with
the development is prohibited by any persons.
i. A 30' vegetated buffer must be maintained between all built -upon area and
the Mean High Water line of surface waters. All roof drains shall terminate
at least 30' from the Mean High Water mark.
17. The permittee must submit a copy of the recorded deed restrictions within
30 days of the date of recording.
Page 5 of 9

State Stormwater Management Systems
Permit No. SW7070920
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 of Water Quality,
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 of Water Quality, in
accordance with North Carolina General Statute 143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances, which may be imposed by
other government agencies (local, state, and federal) having jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by this Division, such as the construction of
additional or replacement stormwater management systems.
5. The permittee grants DENR 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.
Permit issued this the 13th day of November, 2007.
INA ENVIRONMENTAL MANAGEMENT COMMISSION
L
Division of Water Quality
By Authority of the Environmental Management Commission
Page 6 of 9

State Stormwater Management Systems
Permit No. SW7070920
Edenton-Chowan Airport Industrial Park, Phase IIA
Stormwater Permit No. SW7070920
Chowan County
Designer's Certification
1, , as a duly registered
in the State of North Carolina, having been authorized to observe (periodically/ weekly/
full time) the construction of the project,
(Project)
for (Project Owner) hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the project
construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
Signature
Registration Number
Date
SEAL
Page 7 of 9

State Stormwater Management Systems
Permit No. SW7070920
Certification Requirements:
1. The drainage area to the system contains approximately the permitted
acreage.
2. The drainage area to the system contains no more than the permitted
amount of built -upon area.
3. All the built -upon area associated with the project is graded such that the
runoff drains to the system.
4. All roof drains are located such that the runoff is directed into the system.
5. The outlet/bypass structure elevations are per the approved plan.
6. The outlet structure is located per the approved plans.
7. Trash rack is provided on the outlet/bypass structure.
8. All slopes are grassed with permanent vegetation.
9. Vegetated slopes are no steeper than 3:1.
10. The inlets are located per the approved plans and do not cause short-
circuiting of the system.
11. The permitted amounts of surface area and/or volume have been
provided.
12. Required drawdown devices are correctly sized per the approved plans.
13. All required design depths are provided.
14. All required parts of the system are provided, such as a vegetated shelf,
and a forebay.
15. The required system dimensions are provided per the approved plans.
cc: NCDENR-DWQ Regional Office
Chowan County Building Inspections
Page 8 of 9

State Stormwater Management Systems
Permit No. SW7070920
ATTACHMENT "A" OF SVV7070920
Lot 4 Area of lot (total) Area of lot (upland) Allowable BUA / Lot
In square feet In square feet in square feet
1
62,313
62,313
18,500
2
43,819
43,819
14,500
3
69,233
52,253
14,500
4
62,511
45,351
14,500
5
41,362
41,362
14,500
6
78,964
78,964
14,500
7
29,024
29,024
8,500
8
62,679
62,679
14,500
9
45,931
45,931
14,500
10
44,072
44,072
14,500
11
44,037
44,037
14,500
12
44,713
44,713
14,500
13
46,744
46,744
14,500
14
339,516
339,516
39,500
15
44,045
44,045
27,500
16
43,891
43,891
27,500
17
44,000
44,000
27,500
18
43,782
43,782
27,500
19
51,931
51,931
27,500
20
44,000
44,000
27,500
21
43,891
43,891
27,500
22
44,045
44,045
27,500
23
468,178
433,291
49,000
24
73,135
54,147
27,500
25
57,870
43,962
27,500
26
49,665
43,694
27,500
27
71,578
50,769
14,500
28
67,550
51,876
20,000
Page 9 of 9

OFFICE USE ONLY
Date Received
Fee Paid
Permit Number
- -
� �o�
stnl tinti�aan
RECEIVED State of North Carolina
Department of Environment and Natural Resources
CEP ? 7 2007 Division of Water Quality
!n` ®�SpTORMWATER MANAGEMENT PERMIT APPLICATION FORM
DY dAny, Q-� A U This form may be photocopied for use as an original
GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
EDENTON CHOWAN DEVELOPMENT CORP
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
PETER RASCOE, LEGAL COUNCIL
3. Mailing Address for person listed in item 2 above:
PO BOX 1030, EDENTON, NC 27932 _
City: EDENTON State:__ NC Zip: 27932 _
Telephone Number: (__,_252 ) 482-8431
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
EDENTON—CHOWAN AIRPORT INDUSTRIAL PARK PHASE II —A
5. Location of Project (street address):
SOUNDSIDE ROAD
City: EDENTON County:—CHOWAN
6. Directions to project (from nearest major intersection):
TAKE NC 32 SOUTH OUT OF EDENTON 1.5 MILES TO SOUNDSIDE RD.
TURN RIGHT ONTO SOUNDSIDE ROAD. TRAVEL 2.2 MILES TO SITE.
7. Latitude: 36-01 —51 N _ Longitude: 76-34-25W of project
8. Contact person who can answer questions about the project:
Name: JAMES BOWEN, PE — Telephone Number: ( 252 ( 441 —3913
II. PERMIT INFORMATION:
I. Specify whether project is (check one):
X Nev W A�o CUP Y
_Modification
Form SWU-101 Version3.99 Page Iof4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number-------_--___ and its issue date (if known)
3. Specify the type of project (check one):
Low Density X _ High Density __Redevelop _General Permit __Other
4. Additional Project Requirements (check applicable blanks):
_CAMA Major X Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
Ill. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project .
STORMWATER IS ROUTED TO A FOREBAY OF STORMWATER WETLANDS AND
SLOWLY RELEASED. THERE ARE TWO STORMWATER WETLANDS ON THIS PROJECT.
2. Stormwater runoff from this project drains to the
ALBEMARLE SOUND
River basin.
3. Total Project Area:__8Q: 2-____ _acres 4. Project Built Upon Area:25
5. How many drainage areas does the project have? 2
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
Basin Information
Drainage Area 1
Drainage Area 2
Receiving Stream Name
SEE ATTACHED SPREADSHEET
Receiving Stream Class
FOR THIS INFORMATION
Drainage Area
Existing Impervious* Area
Proposed Impervious Area
% Impervious Area (total)
Impervious Surface Area
Drainage Area 1
Drainage Area 2
On -site Buildings
On -site Streets
On -site Parking
On -site Sidewalks
Other on -site
Ot7-site
Total:
Total:
Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off -site impervious area listed above derived?
EVALUATION
FIELD SURVEY AND ON —SITE
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than square feet of any lot shall be covered by structures or Impervious materials.
Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood
decking or the water surface of swimming pools.
3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings.
4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff front outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms.
Form SWU-102
Wet Detention Basin Supplement
Form SWU-103
Infiltration Basin Supplement
Form SWU-104
Low Density Supplement
Form SWU-105
Curb Outlet System Supplement
Form SWU-106
Off -Site System Supplement
Form SWU-107
Underground Infiltration Trench Supplement
Form SWU-108
Neuse River Basin Supplement
Form SWU-109
Innovative Best Management Practice Supplement
FormSWU-101 Version3.99 Page 3of4

VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
Original and one copy of the Stormwater Management Permit Application Form J H B Akii
One copy of the applicable Supplement Form(s) for each BMP J H B _p(
Permit application processing fee of $420 (payable to NCDENR) J H B
Detailed narrative description of stormwater treatment/management J H B _ Jul
Two copies of plans and specifications, including: JHB JV _
- Development/Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
Mean high water line
Dimensioned property/project boundary
Location map with named streets or NCSR numbers
Original contours, proposed contours, spot elevations. finished floor elevations
Details of roads, drainage features, collection systems, and stormwater control measures
Wetlands delineated, or a note on plans that none exist
Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculation_
Drainage areas delineated
Vegetated buffers (where required)
VIL AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm):_ . PETER RASCOE, LEGAL COUNCIL
Mailing Address: PO BOX 1030
City: EDENTON State: NC Zip: 27932
Phone: ( 252 1 482-8431 Fax: ( 252 ) 482-4925
Vill. APPLICANT'S CERTIFICATION
1, (print or type name of person listed in General Information, item 2)
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000.
Date: / / J-lr763z
Form SWU-101 Version3.99 Page 4of4

State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
EXTENDED DETENTION WETLAND SUPPLEMENT
(This.%rm may be photocopied for use as an original.)
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a Extended Detention Wetland supplement for
each proposed basin, design calculations, plans and specifications showing all basin and constructed wetland
details, and a fully executed operation and maintenance agreement.
1. PROJECT INFORMATION (please complete the following information):
Project Name: EDENTON—CHOWAN AIRPORT INDUSTRIAL PARK PHASE II —A
Contact Person: JAMES BOWEN, PE Phone Number: (252) 441 —3913
For projects with multiple basins, specify which basin this worksheet applies to: 1
11. DESIGN INFORMATION (Attach supporting calculations/documentation):
25.7
Drainage Area ac. (on -site rand off site drainage to the basin) O 3 / y
Impervious Area 5•3 ac. (on -site and off -site drainage to the basil ¢ f ' y,
Permanent Pool Elevation 9.0 ft, F
(elevation of the orifice invert out) ` !fCI
Temporary Pool Elevation 10.5 ft. (elevation of the outlet structure invert in) S N, g't_ _\\%
Permanent Pool Surface Area 19,440 sq. ft. (water smface area at permanent pool elevation)
Forebay Surface Area 2,695 (1 4%) sq. ft. (at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area 8,087 (42%) sq. ft. (at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area
Micro Pool Surface Area
Temporary•PiSol Surface Area
Temporary Pool Volume
SAIDA used
Diameter of Orifice
7,024 (36%) sq. fl. (at permanent pool elevation approximately 35%)*
1,634 (8%) sq
23,381 sq
32,426 cu
1.8
2.5 in.
ft. (at permanen! pool elevation approximately 15%) *
ft. (water surface area at tentpor•ar),pool elevation)
ft. (volume detained on top of the permanent pool)
(surface area to drainage area ratio from DTYQ table) *
(2 to 5 day temporary pool draw -down required))
Extended Detention Wetland Supplement Form
Pagel of4

Ill. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. !f a requirement has not been met, attach an explanation of why. At a minimum,
a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations,
plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully
executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Applicants Initials
JHB J4�' The temporary pool controls runoff from the I inch rain.
JHB
-'W' The basin side slopes are no steeper than 3:1.
JHB ``1'' A planting plan for the marsh areas with plant species and densities is provided.
JHB Vegetation above the permanent pool elevation is specified.
JHB An emergency drain is provided to drain the basin.
JHB JH13
The temporary pool draws down in 2 to 5 days.
JHB 3'-4'3 Sediment storage is provided in the permanent pool.
JHB 34-Agi A sediment disposal area is provided.
JHB J05 Access is provided for maintenance.
JHB J"61 The drainage area (including any offshe area) is delineated on a site plan.
JHB Access is provided for maintenance.
JHB J fd -r:� Plan details for the wed and are provided.
JHB Plan details for the inlet and outlet are provided.
JHB Jog A site specific operation and maintenance agreement, signed and notarized by the
responsible party is provided (see http://h2o.ehnr.state.nc.us/ncwetlands/oandm.doc).
. Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of
the NC DENR Stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.
Extended Detention Wetland Supplement Form
Page 2 of 4

IV. EXTENDED DETENTION WETLAND OPERATION AND MAINTENANCE AGREEMENT
The extended detention wetland system is defined as the wetland detention basin, pretrement including
forebays and the vegetated filter if one is provided.
This system (check one) does X does not incorporate a vegetated filter at the outlet.
This system (check one) does X does not incorporate pretreatment other than a forebay.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the extended detention wetland system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 days as designed.
Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow
grass cover around wetland area to maintain a maximum height of six inches, and remove trash as
needed. Vegetation selection will be of the same species as original plantings.
Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning. Trash and debris will be cleared away from grates, curb cuts, velocity
reduction devices and piping.
Accumulated sediment will be removed from the forebay and deep pool semi-annually or when depth
is reduced to 75% of the original design depth. Removed sediment shall be disposed of in an
appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near treatment system or stream, etc.)
The measuring device used to determine the sediment elevation shall be such that it will give an
accurate depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 6.75 feet in the deep pool, the sediment shall be removed.
When the permanent pool depth reads 6.75 feet in the forebay, the sediment shall be removed.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be
removed to design levels. This shall be performed by removing the upper 6 inches of soil and
stockpiling it. Then the marsh area shall be excavated six inches below design elevations. Afterwards
the stockpiled soil should be spread over the marsh surface to redistribute wetland plant seeds. The
soil should not be stockpiled for more than two weeks.
Wetland planting densities in the marsh areas should be maintained by replanting bare areas as
needed. Wetland plants should be encouraged to grow in the marsh areas.
Extended Detention Wetland Supplement Form
Page 3 of 4

If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
Level spreaders or other structures that provide diffuse flow shall be maintained every six months.
All accumulated sediment and debris shall be removed from the structure, and a level elevation shall
be maintained across the entire flow spreading structure. Any down gradient erosion must be
repaired and/or replanted as necessary.
8. All components of the extended detention wetland system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to
any changes to the system or responsible party.
Print name: PETER RASCOE
LEGAL COUNCIL
Address: PO BOX 1030 EDENTON NC
Phone: [phone]
Signature:
Date: 70
27932
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.
1, SU�SCnf\(2- I `i KA a Notary Public
,Publicf�or the State of N6Jr o 0(ttfdjog County of
G)WOt-S do hereby certify that I ��,f aSCCI e personally appeared before
me this �_ day of SQ.(}� QL A VW and acknowledge the due execution of the forgoing
wet [wetland] detention basin maintenance requirements. Witness my hand and official seal,
a�E STAQz",1
P G�
,J? �o�ARy
C)
AU'D
""��cOUNTV, N�P�.���•
SEAL
My commission expires 5- oL I
Extended Detention Wetland Supplement Form
Page 4 of 4

/ . -N
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
EXTENDED DETENTION WETLAND SUPPLEMENT
(This.fann mat+ be pholocopied for use as an original.)
DWO Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a Extended Detention Wetland supplement for
each proposed basin, design calculations, plans and specifications showing all basin and constructed wetland
details, and a fully executed operation and maintenance agreement.
1. PROJECT INFORMATION (please complete the following information):
Project Name : EDENTON—CHOWAN AIRPORT INDUSTRIAL PARK PHASE II —A
Contact Person: JAMES BOWEN, PE Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheel applies to:
11. DESIGN INFORMATION (Attach supporting calculations/documentation):
Drainage Area
55.0
ac.
(on -site and of -site drainage to the basin) ?� i
Impervious Area
10.1
ac.
(on -site and off -site drainage to the basin)
Permanent Pool Elevation
9•0
ft.
S
(elevation of the orifice invert on() �r
it
Temporary Pool Elevation
10.5
ft.
(elevation oflhe outlet structure invert in)
Permanent Pool Surface Area
37,056 sq. III.
(hater surface area at permanent pool elevation)
Forebay Surface Area
4,899
(13%) sq. It.
(at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area
12,606
(34%) sq. fi.
(at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area
16,427
(44%) sq fl
(at permanent pool elevation opproximatel), 35°/a)*
Micro Pool Surface Area
3,124
(8%) sq. fi.
(at permanent pool elevation approximately 15%)*
Temporary Pool Surface Area 43,750 sq. fi. (water surface area at temporary pool elevation)
Temporary Pool Volume 61 ,1 68
SA/DA used 1.55
Diameter of Orifice 2.5
ft. (volume detained on top ofthe permmuem pool)
(surface area to drainage area ratio from Dli'Q table) *
(2 to 5 day temporary pool drarv-down required))
Extended Detention Wetland Supplement Form
Page I of 4

I . I

111. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. if a requirement has not been met, attach an explanation of w1ry. At a minimum,
a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations,
plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully
executed operation and maintenance agreement. An incomplete submittal package will result in a request foi
additional information and will substantially delay final review and approval of the project.
Applicants Initials
JHB -�4�; The temporary pool controls runoff from the 1 inch rain.
JHB �H5 The basin side slopes are no steeper than 3:1.
JHB JN6 A planting plan for the marsh areas with plant species and densities is provided.
JHB Vegetation above the permanent pool elevation is specified.
JHB J4413 An emergency drain is provided to drain the basin.
JHB --*4g The temporary pool draws down in 2 to 5 days.
JHB .,V13 Sediment storage is provided in the permanent pool.
JHB -W A sediment disposal area is provided.
JHB 33-j Access is provided for maintenance.
JHB JH!3 The drainage area (including any offsite area) is delineated on a site plan.
JHB J+ 19 Access is provided for maintenance.
JHB 1 i f3 plan details for the wetland are provided.
JHB HO Plan details for the inlet and outlet are provided.
JHB ' 44A site specific operation and maintenance agreement, signed and notarized by the
responsible party is provided (see http://h2o.chnr.state.nc.us/ncwetlands/oandm.doc).
* Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of
the NC DENR Stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.
Extended Detention Wetland Supplement Form
Page 2 of 4

IV. EXTENDED DETENTION WETLAND OPERATION AND MAINTENANCE AGREEMENT
The extended detention wetland system is defined as the wetland detention basin, pretrement including
forebays and the vegetated filter if one is provided.
This system (check one) X does does not incorporate a vegetated filter at the outlet.
This system (check one) does X does not incorporate pretreatment other than a forebay.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the extended detention wetland system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow
grass cover around wetland area to maintain a maximum height of six inches, and remove trash as
needed. Vegetation selection will be of the same species as original plantings.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning. Trash and debris will be cleared away from grates, curb cuts, velocity
reduction devices and piping.
4. Accumulated sediment will be removed from the forebay and deep pool semi-annually or when depth
is reduced to 75% of the original design depth. Removed sediment shall be disposed of in an
appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near treatment system or stream, etc.)
The measuring device used to determine the sediment elevation shall be such that it will give an
accurate depth reading and not readily penetrate into accumulated sediments.
When the permanent pool depth reads 6.75 feet in the deep pool, the sediment shall be removed.
When the permanent pool depth reads 6.75 feet in the forebay, the sediment shall be removed.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be
removed to design levels. This shall be performed by removing the upper 6 inches of soil and
stockpiling it. Then the marsh area shall be excavated six inches below design elevations. Afterwards
the stockpiled soil should be spread over the marsh surface to redistribute wetland plant seeds. The
soil should not be stockpiled for more than two weeks.
5. Wetland planting densities in the marsh areas should be maintained by replanting bare areas as
needed. Wetland plants should be encouraged to grow in the marsh areas.
Extended Detention Wetland Supplement Form
Page 3 of 4

6. If the basin must be drained for an emergency or to perform maintenance, the flushing ofsedimenl
through the emergency drain shall be minimized to the maximum extent practical.
Level spreaders or other structures that provide diffuse flow shall be maintained every six months.
All accumulated sediment and debris shall be removed from the structure, and a level elevation shall
be maintained across the entire flow spreading structure. Any down gradient erosion must be
repaired and/or replanted as necessary.
8. All components of the extended detention wetland system shall be maintained in good working order.
1 acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to
any changes to the system or responsible party.
Print name: PETER RASCOE
Title: LEGAL COUNCIL
PO BOX 1030 EDENTON NC 27932
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.
1, 9u:5a ne S 4a inQ 5 , a Notary Public for the State of L16W 001-Aline, County of
+Q.5 do hereby certify that PZ}Q f go,-,C n .e— personally appeared before
me this -I1 day of hQr , a001 , and acknowledge the due execution of the forgoing
wet [wetland] detention basin maintenance requirements. Witness my hand and official seal,
` NE STA44 '
,co �pTAgy J
- a=
_� z=
''.&Nry N01
SEAL
My commission expires '9 -� n-
Extended Detention Wetland Supplement Form
Page 4 of 4

tt„l.
ll,
./ V

NCDENR
N�0
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
The`Requiiedlfe ns;CheckbsG(Perf-'ill) m"usf`he printed?ffllid;out and submitted.'along_w th all;of tt a required.'infoi naffon.
vrolect name
Contact name
Phone number
Date
Drainage area number
Airport Industrial Park Phase II -A
James Bowen - Hobbs Upchurch and Assoc
252A41-3913
November 1, 2007
1
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Ext Detention Wet
Drawdown flow from the BMP 0.184 cfs
For Level Spreaders Receiving Flow from the Drainage Area
Do not complete this section of the worksheet.
Drainage area
ft2
Do not complete this section of the worksheet.
Impervious surface area
flz
Do not complete this section of the worksheet.
Percent impervious
Do not complete this section of the worksheet.
Rational C coefficient
Do not complete this section of the worksheet.
Peak flow from the 1 Whir storm
cis
Do not complete this section of the worksheet.
Time of concentration
min
Rainfall intensity, 10-yr storm
inmr
Do not complete this section of the worksheet.
Peak now from the 10-yr storm
cfs
Do not complete this section of the worksheet.
Where Does the Level Spreader Discharge?
To a biorelention cell?
(Y or N)
To a wetland?
Y
(Y or N)
Do not need to complete filter strip characterization below.
To a filter strip or riparian buffer?
(Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
ft
Width of dense ground cover
it
Width of wooded vegetation
ft
Total width
ft
Slope (from level lip to to top of bank)
%
Are any draws present?
(Y or N)
Level Spreader Design
Forebay surface area
sq ft
Feet of level lip needed per cis
fucfs
Answer "Y' to one of the following:
Length based on the 1 inlhr storm?
Y
(Y or N)
Length based on the 10-yr, 24-hr storm?
(Y or N)
Length based on the BMP discharge rate?
(Y or N)
Design flow
0.18
cis
#VALUE!
Is a bypass device provided?
N
(Y or N)
A bypass device must be provided.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Pans I. and II. Design Summary, page 1 of 2

Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
13 ft #VALUE!
N (Y or N)
Y (Y or N)
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
cfs
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
CARO
? .L SEA
3
Form SW401-1-evel Spreader. Filter Strip, Restored Riparian Buffer-Rev.2 Parts I, and ll. Design Summary, page 2 of 2

,,
.+.
�.>�
.: ��
. !.? N
'� . 's;
_ r, -�
^:�. � - cam•
�T� ,4J _�
y
•{ ',\
„ . (.'�
f��//ff��l
.
i••���

OHO'
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
The RequirediItems:Checklrst;(P�a flll) oust 6JTp ntedsfflled oiJ1 submitted alony;wdh'all,of,the requiied ififoimation
Project name
Contact name
Phone number
Date
Drainage area number
and Assoc
It DESIGNiNFORMATION. - . - _. r v..... I : : . ' "-.'I ; y:;, '....; .h.. _ ' `.I
ror Level apreaoers necemng rlow rrom a omr
Type of BMP Ext Detention Wet
Drawdown Flow from the BMP 0.164 cfs
For Level Spreaders Receiving Flow from the Drainage Area
Do not complete this section of the worksheet.
Drainage area
ft2
Do not complete this section of the worksheet.
Impervious surface area
ftz
Do not complete this section of the worksheet.
Percent impervious
Do not complete this section of the worksheet.
Rational C coefficient
Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm
cfs
Do not complete this section of the worksheet.
Time of concentration
min
Rainfall intensity, 10-yr storm
in/hr
Do not complete this section of the worksheet.
Peak flow from the 10-yr storm
cfs
Do not complete this section of the worksheet.
Where Does the Level Spreader Discharge?
To a bioretenlion cell? (Y or N)
To a wetland? Y (Y or N) Do not need to complete flier strip characterization below.
To a filter strip or riparian buffer? (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width ft
Slope (from level lip to to top of bank) %
Are any draws present? (Y or N)
Level Spreader Design
Forebay surface area
sq ft
Feet of level lip needed per cfs
ft/cfs
Answer 'Y* to one of the following:
Length based on the 1 in/hr storm?
Y (Y or N)
Length based on the 10-yr, 24-hr storm?
(Y or N)
Length based on the BMP discharge rate?
(Y or N)
Design flow
0,164 cfs #VALUE!
Is a bypass device provided?
N (Y or N) A bypass device must be provided.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 1 of 2

Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
13 ft #VALUE!
N (Y or N)
Y (Y or N)
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
It
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
ft
Do not complete this section of the worksheet.
cfs
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
\w"�:
• oFESS%oy• per:
EAL
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and If Design Summary, page 2 of 2