SW7080611_CURRENT PERMIT_20081006

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
DOC TYPE
CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE��Q(J�
YYYYMMDD

1(
T F9 wa:R V Michael F. Easley, Governor
OG William G. Ross Jr, Secretary
rNorth Carolina Department of Environment and Natural Resources
1
Y Coleen H. Sullins Director
Division of Water Quality
October 6, 2008
Craven County Regional Airport Authority
Attn: Mr. Tom Braaten
PO Box 3258
New Bern, NC 28564
Subject: Stormwater Permit No. SW7080611
Craven County Regional Airport
2008 Parking Lot Expansion
High Density Stormwater Project
Craven County
Dear Mr. Braaten:
The Washington Regional Office received a completed Stormwater Management Permit Application
for the subject project, located off Airport Road near New Bern, NC on August 25, 2008. Staff
review of the plans and specifications has determined that the project, as proposed, will comply
with the Stormwater Regulations set forth in Title 15A NCAC 21-1.1000. We are forwarding Permit
No. SW7080611 dated October 6, 2008. for the subject project.
This permit rescinds the previous permit SW7990825, and shall be effective from the date of
issuance until October 6, 2018, 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 and in the submitted application. 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
either Bill Moore, or me at [phone].
in ely,
A Ho
Regional Supervisor
Surface Water Protection Section
cc: The LPA Group of NC
Craven County Building Inspections
rrWashington Regional Office
Central Files
North Carolina Division of Water Quality
Internet: h2o.enr.state.nc.us
943 Washington Square Mall
Phone: [phone]
One
Washington, NC 27889
FAX [phone]
Nort iCarolliina
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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
Craven County Regional Airport Authority
Craven County
FOR THE
construction, operation and maintenance of a wet detention basin 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 rescinds the previous permit SW7990825, and shall be effective from the date of
issuance until October 6, 2018, 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 on page 3 of this permit. The stormwater controls have been
designed to handle the runoff from 6.6 acres 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 and permit.
4. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
5. The runoff from all built -upon area within the permitted drainage areas of this project
must be directed into the permitted stormwater control system.
Page 2 of 7

6. The following design criteria have been provided in the wet detention basin and must be
maintained at design condition:
a.
Drainage Area:
10.1 acres
b.
Total Impervious Surfaces:
6.60 acres
C.
Design Storm:
1.0 - inch
d.
Pond Depth:
3.77 ft average
e.
TSS removal efficiency:
90 %
f.
Permanent Pool Elevation, FMSL:
9.50 ft
g.
Permanent Pool Surface Area Required:
29,038 sf
h.
Permanent Pool Surface Area Provided:
35,207 sf
i.
Permanent Storage Volume Required:
23,611 cf
j.
Permanent Storage Volume Provided:
27,002 cf
k.
Temporary Storage Elevation, FMSL:
10.2 ft
I.
Small Diameter Controlling Orifice:
3.00 - inch pipe
M.
Receiving Stream/River Basin:
UT -Scotts Creek/Neuse
n.
Classification of Water Body:
SC;sw,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 Plans 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 bypass structure, filter media, flow spreader,
catch basins, piping and vegetated filter.
g. A clear access path to the bypass structure must be available at all times.
Page 3 of 7

4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
5. 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.
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 at all times.
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 October 6, 2018.
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.
Page 4 of 7

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.
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. A copy of the approved plans and specifications shall be
maintained on file by the Permittee for the life of the project.
9. The permittee shall notify the Division of any name, ownership or mailing address
changes within 30 days.
Permit issued this the 6 th day of October, 2008.
LINA ENVIRONMENTAL MANAGEMENT COMMISSION
for
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW7080611
Page 5 of 7

Stormwater Permit No. SV 7080611
Wet Pond System
Craven Regional Airport, Parking Lot Expansion
New Bern, NC
Designer's Certification
I, , 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.
Note: The checklist on the following page must be included with this Certification. Any changes
or deviations from the approved plans and specifications must be explained in detail, and may
require a permit modification. The certification forms should be submitted to the Division of
Water Quality at the appropriate Regional office.
Signature
Registration Number
Date
SEAL
Page 6 of 7

y
Complete this checklist for each system and includewith Certification:
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 bypass structure elevations are per the approved plan.
6. The bypass structure is located per the approved plans.
7. A 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. All required design depths are provided.
13. All required parts of the system are provided.
14. The required system dimensions are provided per the approved plans.
Page 7 of 7

Fee Paid
State of North Carolina 6WAcg- 6/19/M
Department of Environment and Natural Resources S� f o i�
Division of Water Quality (ins
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied far use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Craven County Regional Airport Authority
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Tom Braaten -Director, Craven County Regional Airport
3. Mailing Address for person listed in item 2 above:
Post Office Box 3258
City: New Bern State. NC Zip: 28564-3258
Phone: ( 252 ) 638-8591 Fax: ( 252 ) 638-5930
Eiiiail:—[e-mail]
4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Craven County Regional Airport - Parking Lot Expansion
5. Location of Project (street address):
200 Terminal Drive
City: New Bern County: Craven Zip: 28562-6455
6. Directions to project (from nearest major intersection):
'rake US Route 70 south from New Bern. Turn right onto Airport Road. "Cake right onto Terminal Entance
Road. Stay right onto Loop Access Road Parking lot area will be on the left
7. Latitude: 35° 04' 37.5" N Longitude: 77' 01' 58.4" W of project
8. Contact person who can answer questions about the project:
Name: Jason Elliott (THE LPA GROUP of NC p.a.) Telephone Number: ( 919 ) 954-1244
Email: [e-mail]
Il. PERMIT INFORMATION:
Tonn SWIJ-101 Version 03.27.08
Pagel of 4

1. , Specify whether project is (check one): ®New ❑Renewal ❑Modification
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number N/A and its issue date (if known) N/A
3. Specify the type of project (check one):
❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑LAMA Major ®Sedimentation/Erosion Control ❑404/401 Permit ❑NPDES Stormwater
III. 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 from this project will be treated using a wet detention pond designed for 90% TSS Removal
2. Stormwater runoff from this project drains to the Neuse River basin.
3. Total Property Area: 549 acres
4. Total Wetlands Area: 0 acres
5. 100' Wide Strip of Wetland Area: N/A acres (not applicable if no wetlands exist on site)
6.. Total Project Area**: 10.1 acres 7. Project Built Upon Area: 66 %
8. How many drainage areas does the project have? 1
9. 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.
For hi h densi ro'ects, com lete the table with one drama e area for h d
T3asm lnf"
.
Receiving Stream Name
1 r ,Drainage,Area4e1_.i « °
Scott's Creek
eac en meere Stormwater d vac
�rea 2�m ;M „1
Stream Class & Index No.
SC; Sw, NSW
Total Drainage Area (so
440,524 I v.
On -site Drainage Area (so
440,524
Off -site Drainage Area (so
0
Existing Impervious* Area (so
108,450 2 49
.6 .- G�
Proposed Impervious*Area (so
180,217 4. A
% Impervious* Area (total)
66 V
76 Z S�
rl)
'Lnpernoasl,Surface'Area
.... _ ... ,.
On -site Buildings (so
Dramage,Aregll '. µ
..
.M... try v, .E. _�. u. .� .�, :9a. . c..
129
r 2
et Drainage tieat2, n µ'r 'r`
�'_� .�
On -site Streets (so
32,493
On -site Parking (so
255,275
On -site Sidewalks (so
770
Other nn-sife W)
n
Off -site (so
0
Total (so:
288,667
nnperunous 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 03.27.08 Page 2 of

**Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area
percentage calculation. This is the area used to calculate percent project built upon area (BUA).
10. How was the off -site impervious area listed above derived?
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following 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. Forms can be
downloaded from litto://h2o.enr.state nc us/su/bmp forms htm - deed restrictions.
Form DRPC-1
High Density Commercial Subdivisions
Form DRPC-2
High Density Developments with Outparcels
Form DRPC-3
High Density Residential Subdivisions
Form DRPC-4
Low Density Commercial Subdivisions
Form DRPC-5
Low Density Residential Subdivisions
Form DRPC-6
Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded deed restrictions and protective covenants for this
project shall include all the applicable items required in the above form, 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. Forms can be downloaded from http://h2o.enr state nc us/su/bmp forms htm.
Form SW401-Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW40'1-Infiltration Basin
Form SW401-Infiltration Trench
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
Low Density Supplement
Curb Outlet System Supplement
Off -Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement
Form SWU-101 Version 03.27.08 Page 3 of

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 Office. (Appropriate office may be found by locating project on the
interactive online map at littp://ii2o.eiir.state.ilc.us/su/nisi maps 1itm)
1. 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
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/management
• Copy of any applicable soils report
• Two copies of plans and specifications (sealed, signed & dated), including:
- 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 calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. 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. (ex. designing engineer or firm)
Designated agent (individual or firm): The LPA GROUP of North Carolina p.a.
Mailing Address: 5000 Falls of Neuse Road Suite 304
City:
Phone: ( 919 ) 954-1244
Email: [e-mail]
VIII. APPLICANT'S CERTIFICATION
State: NC Zip: 27609
Fax: ( 919 ) 954-1345
I, (print or type name of person listed in General Information, itea 2) Tonn Braaten
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. ^ g
Signature�tL (\VUSJJ/;j� Dates! vU%t
Form S W U-101 Version 03.27.08 Page 4 of 4

Craven County, NEW BERN, NC 3380 NCDENR
228553
NV DATE INVOICE P.O. ACCOUNT
6/10/08 PARK. LOT EXPAND 834. 9500. 478. 7508
JUN 18 2008
Craven County
406 CRAVEN STREET
NEW BERN, NORTH CAROUNA 28560
IJ
PAY
To THE ORDER NCDENR
OF WASHINGTON REGIONAL OFFIC
943 WASHINGTON SQUARE MAL
ll
WASHINGTON NC 27889
PmvWon for Payment of this Instrument has been -7 Q QCl O 6 r /
Oproved as required by the Local Government
Budget and Fiscal Control Act.
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DATE 0/OB CHECK NO.
228553
114002285531Ie 1:0531i003001e0011b23890911e
AMOUNT
505.00
505.00
228553
VOID IF NOT PRESENTED FOR PAYMENT
WITHIN 60 DAYS
rINPLu
505.00
r
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THE LPA GROUP of North Carolina, p.a.
Transportation Consultants
5000 FALLS OF NEUSE ROAD ■ SUITE 304 ■ RALEIGH, NORTH CAROLINA 27609 In 919-954-1244 ■ FAX [phone]
June 16, 2008
Mr. Bill Moore
NCDENR, Division of Water Quality
Washington Regional Office
943 Washington Square Mall
Washington, North Carolina 27889
Re: Craven County Regional Airport
Parking Lot Expansion
Dear Bill:
JUN 18 2008
DkNQ-WARD
Enclosed please find two copies of the plans for the above referenced project for your review
and approval. Also enclosed are two copies of the design calculations, supporting
documentation, soils report, Wet Detention Basin Supplement and Wet Detention Basin
Operation and Maintenance Agreement for the Stormwater Management Permit Application.
The Parking Lot Expansion project is being completed to provide additional long-term
passenger parking the main terminal at the Craven County Regional Airport. As part of the
project, the existing wet detention pond will be expanded to treat runoff both from the current
project, as well as the ultimate build -out of the parking lot.
The required check in the amount of $505.00, to cover the fee for plan review has already been
sent directly to your office. I have enclosed a copy of the check, in case you need it.
If you have any questions or need additional information, please do not hesitate to call.
Sincerely,
THE LPA GROUP of North Carolina, p.a.
J //o/nL. Elliott, El
Aviation Desian
Enclosures
Member of THE LPA GROUP INCORPORATED
ATIANTA ■ BALTIMORE ■ BATON ROUGE • CHARLOTTE ■ COLUMBIA ■ GREENSBORO ■ IRVINE • JACKSONVILLE • KENNESAW • KNOXVILLE ■ LITTLE ROCK
McLEAN ■ MOBILE • NASHVILLE • OCEAN SPRINGS • ORLANDO ■ RALEIGH ■ SARASOTA ■ TALLAHASSEE • TAMPA • WEST PALM BEACH

§_"j JUN 0 G 2008
THE LPA GROUP of North Carolina, .a.
Transportation Consultants
5000 FALLS OF NEUSE ROAD ■ SUITE 304 ■ RALEIGH,
May 29, 2008� t `V
Mr. Tom Braaten U
Airport Director
Craven County Regional Airport
4
200 Terminal Drive
New Bern, North Carolina 28562-6455
Re: Parking Lot Expansion
Dear Tom: (} �
Craven County
406 CRAVEN STREET
NEW BERN, NORTH CAROLINA 28560
PAY
TO THE
ORDER NCDENR
OF WASHINGTON REGIONAL. OF —IC
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McLEAN • MOBILE • NASHVIIIF • OCEAN SPRINGS • ORLANDO • RALEIGH • SARASOTA • TALLAHASSEE • TAMPA ■ WEST PALM BEACH

STORMWATER MANAGEMENT PERMIT
FOR I�`139ys5t
TERMINAL PARKING LOT EXPANSION
AT JUN 18 2008
CRAVEN COUNTY REGIONAL AIRPORT
t�,s%1 ;tPV A a0
PROJECT DESCRIPTION AND PURPOSE
This project is being completed to provide additional long-term parking for the terminal building
at the Craven County Regional Airport. As a result of the ongoing growth of the airport, more
parking is needed to handle the increased traffic. As part of the project, the existing wet
detention pond will also be expanded to treat runoff from the ultimate build -out of the parking
lot. The project will be split into two phases. The first phase will include the initial portion of the
parking expansion and the full expansion of the wet detention pond.
EXISTING CONDITIONS
This project lies within the Neuse River Basin. The site is located inside the terminal area's
Loop Access Road. The road is located next to Scott's Creek. Runoff from this area is drained to
the existing wet detention pond. The outlet pipe for the existing pond runs under the Loop
Access Road and empties directly into Scott's Creek. Scott's Creek is considered a class SC
waterway, with supplemental classifications as Sw (swamp waters) and NSW (nutrient sensitive
waters). The area of the project does not contain- and is not adjacent to- any wetland areas.
PROPOSED DEVELOPMENT
The current phase of development for the Parking Lot Expansion will create an additional 46,762
sq.ft of impervious surface area on the Airport property. Also included in the current phase will
be the expansion of the existing wet detention pond to treat the runoff from all future impervious
area for the site.
Future development in this area includes further expansion of the proposed parking lot. This
future development will add an additional 133,455 sq.ft. of impervious area to the drainage
basin.
STORMWATER QUALITY ANALYSIS
To provide treatment for the entire buildout of the Parking Lot Expansion project, the existing
wet detention pond will be expanded to provide treatment for the development in this area. All
areas draining to the pond are located on -site. The total drainage area to the wet detention pond is
440,524 sq.ft (10.1 acres). The total impervious drainage area at the completion of the full
parking expansion will be 288,667 sq.ft (6.6 acres), which is 65.5% of the total area.
The wet detention pond has been designed to treat the first 1 inch of rainfall, in accordance with
the NCDENR Stormwater BMP Manual. Due to the lack of space to include a vegetative filter
strip, the wet detention pond has been designed for 90% TSS removal. The pond will have an
Parking Lot Expansion I Craven County Regional Airport
June,2008

average depth of 3.77 feet. The treatment volume provided by the pond is 27,002 cu.ft (the
minimum required volume is 23,611 cu.ft). The surface area at the permanent pool elevation is
35,207 sq.ft (the minimum required surface area is 29,038 sq.ft).
Runoff from the area will first enter a forebay that will be used for pre-treatment to slow down
the velocity and allow settlement of large sediment particles before entering the main detention
basin. The bottom elevation of the proposed forebay is 5.0 feet. The volume of the forebay at the
permanent pool elevation is 18.5% of the entire volume of the permanent pool. The stormwater
would then pass over a 50 foot wide spillway, which would have an elevation of 9.5 feet, and
into the main pond. The bottom elevation of the proposed main pond is 2.0 feet. The top of the
pond is approximately 12.5 feet.
The pond would have a permanent pool elevation of 9.5 feet. The permanent pool will be
maintained at or below this elevation by a 3 inch, submerged orifice. The orifice is sized to
release the volume of the temporary pool over a period of 2.8 days. Runoff from the area would
build to an elevation of 10.2 feet in the forebay and main pond before draining through a
rectangular 12 inch by 6 inch orifice opening. Through the rectangular opening, the stormwater
would enter the proposed riser structure and exit through the 24 inch pipe which runs under the
Loop Access Road. The rectangular orifice is used to keep the post -development discharge
below the pre -development discharge. The outlet pipe empties directly into Scott's Creek. The
riser structure will also have an over -flow weir at an elevation of 11.0 feet. The overflow weir
will consist of 4 foot by 8 inch rectangular openings cut into three sides of the structure. This
weir is to release extra stormwater during larger storm events.
The entire drainage area was analyzed using XP-SWMM software. The area was modeled using
the SCS Method to calculate runoff. The area was modeled using both the existing conditions
and the proposed design at full buildout. The existing conditions were modeled in order to keep
the post -development discharge below or equal to the pre -development discharge for the 1-yr, 24
hr storm. The 1-yr discharge from the pond was 1.26 cfs for the existing conditions. The
proposed design yielded a 1-yr discharge of 1.14 cfs. The maximum pond elevation for the 1-yr
storm was 10.69 feet.
The drainage for the site was designed to accommodate runoff from a 10-yr storm event. The
proposed design was analyzed using the 10-yr storm event. The pond elevation was also checked
using the 50-yr and 100-yr storm events to ensure that the overflow weir was enough to keep it
from overtopping under these conditions. Using the XP-SWMM software, the pond elevation
rose to 11.43 feet during the 10-yr storm. This elevation leaves approximately one foot of
freeboard. The 50-yr storm rose to an elevation of 11.88 feet and the 100-yr storm rose to an
elevation of 12.18 feet, which is below the pond's top elevation. The lowest point along the edge
of pavement of the access road adjacent to the pond is 12.84 feet.
The proposed pond is adequately sized to provide treatment for the first 1 inch of runoff from the
10-yr storm event, as well as hold the additional volume from the 100-yr storm without
overtopping. Graphs for the pond, existing and proposed pipes, and the outlet structure are
enclosed for the 10-yr storm. Graphs of the pond elevations are also enclosed for the 1-yr, 50-yr,
and 100-yr storms.
Parking Lot Expansion 2 Craven County Regional Airport
June, 2008

Permit Number:
(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. ` ", [T
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:
JUN 18 2008
I r1A1. nA!p,,s-)0
�d'�4 A w
— 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:
The entire BMP
The perimeter of the wet
detention basin
Potentialproblem:
Trash/debris is present.
Areas of bare soil and/or
erosive gullies have formed.
How I will remediate theproblem:
Remove the trash/debris.
Regrade the soil if necessary to
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
lon
Maintain vegetation at a height of
a roxinately six inches.
Fonn SW401-Wet Detention Basin O&M-Rev.3
Page 1 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate theproblem:
The inlet device: pipe or
swale
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
swale.
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problenis 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 21ants rather than spraying.
The vegetated shelf
Best professional practices
show that pruning is needed
Prune according to best professional
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.
Catta=ls, phragmites cr uuier
invasive plants cover 50. of
the basin surface
Reiiiuve the piduis by wiping them
with pesticide (do not spray).
form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element:
Potentialproblem:
How I will remediate the roblem:
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
the embankment.
Consult a dam safety specialist to
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
Re air 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-
1756.
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 7.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 3__5 feet in the forebay, the sediment
shall be removed.
Sediment Removal
Bottom
6_0' 1
-----------------
FOREBAY
BASIN DIAGRAM
ill in the blanks)
/-ft Min.
Sediment
Storage
Permanent Pool Elevation 9.5'
Pool
\ Sediment Removal Elevation 3_0' Volur
Bottom Elevation
MAIN POND
1-ft
Siuiage
Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4

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: Craven County Regional Airport - Parking Lot Expansion
BMP drainage area number: N/A
Print name: Tom Braaten
Title: Director, Craven County Regional Airport
Address: Post Office Box 3258 New Bern NC 28564-3258
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, Kathleen L. Sunshine , a Notary Public for the Slate of
North Carolina County of Crave , do hereby certify that
Tom n eaten personally appeared before me this 3rd.
day of Tune 9OC)8 and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
My commission expires_ December 4, 2010
Form SW40I-Wet Detention Basin O&M-Rev.3 Page 4 of 4

Permit No.
(to be provided by DWQ)
p? W A TFH
®O"A ow %
h
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 (Pad III) must be printed, filled out and submitted along with all of the required information.
Project name
Contact person
Phone number
Date
Drainage area number
[phone]
Jun-08
N/A
Craven County Regional Airport - Parking Lot Expansion
Jason L. Elliott, El
II11DESIGNIIN FORMATION
Site Characteristics
Drainage area
440,524.00
ftz
Impervious area
288,667.00
ft'
%impervious
65.53
%
Design rainfall depth
1.00
in
Storage Volume: Non -SR Waters
ld"k+ll
Minimum volume required
23,611.00
-ft3
Volume provided
27,002.00
ft3
Storage Volume: SR Waters
JUN 1 8 2008
1-yr, 24-hr runoff depth
in
Pre -development 1-yr, 24-hr runoff
ft3
f f) K:'
Post -development 1-yr, 24-hr runoff
ft3
Minimum volume required
ft3
Volume provided
ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth
3.52
in
Rational C, pre -development
0.35
(unitless)
Rational C, post -development
0.68
(unifless)
Rainfall intensity: 1-yr, 24-hr storm
0.15
dift
Pre -development 1-yr, 24-hr peak flow
0.54
ft3/sec
Post -development 1-yr, 24-hr peak flow
1.04
ft3/sec
Pre/Post 1-yr, 24-hr peak flow control
0.51
ft3/sec
Basin Elevations
Basin bottom elevation
2.00
It
Sediment cleanout elevation
3.00
ft
Bottom of shelf elevation
9.00
It
Permanent pool elevation
9.50
ft
SHWT elevation
-10.00
ft
Top of shelf elevation
10.00
it
Temporary pool elevation
10.20
It
Form SW401-Wet Detention Basin-Rev.4 Parts I. & 11. Design Summary, Page 1 of 2

Permit No.
Ito be provided by D WQ)
tt y DESI GN; IN EORMAT.ION
Volume and Surface Area Calculations
SAIDA ratio
6.60
(unitless)
Surface area at the bottom of shelf
29,913.00
ftz
Volume at the bottom of shelf
116,438.00
ft'
Permanent pool, surface area required
29,038.00
ftZ
Permanent pool, surface area provided
- 35,207.00
ft2
OK
Permanent pool volume
132,700.00
-ft'
Average depth for SAIDA tables
3.77
It
OK
Surface area at the top of shelf
39,889.00
ft'
Volume at the top of shelf
151,462.00
ft'
Forebay volume
24,521.00
ft'
Forebay % of permanent pool volume
18.48
%
OK
Temporary pool, surface area provided
41,819.00
ft2
Drawdown Calculations
Treatment volume drawdown time
2.80
days
OK
Treatment volume discharge rate
0.11
ft'Is
Pre -development 1-yr, 24-hr discharge
1.26
ft'Is
OK
Post -development 1-yr, 24-hr discharge
1.14
ft'/s
OK
Additional Information
Diameter of orifice
3
in
Design TSS removal
90
%
Basin side slopes
3.00
:1
OK '
Vegetated shelf slope
10.00
:1
OK
Vegetated shelf width
10.00
ft
OK
Length of flowpath to width ratio
3.00
; A
OK
Length to width ratio
1.60
:1
OK
Trash rack for overflow & orifice?
Y
(Y or N)
OK
Freeboard provided
1.00
ft
OK
Vegetated filter provided?
N
(Y or N)
Design must be based on 90% TSS removal
Recorded drainage easement provided?
NA
(Y or N)
OK
Capures all runoff at ultimate build -out?
Y
(Y or N)
OK
Drain mechanism for maintenance or emergencies
Pump Out
Form SW401-Wet Detention Basin-Rev.4 Pans I. & II. Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
IIL REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
GO "/ 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build -out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Basin dimensions,
Pretreatment system,
High Flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
S 3 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.
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.
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay,
to verify volume provided.
A
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
Nip 9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1