SW8050547_Historical File_20201006

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
BRIAN WRENN
October 6, 2020
NORTH CAROLINA
Envimnmaud Quality
New Hanover County Airport Authority
Attn: Granseur Dick, Facilities Director
1740 Airport Boulevard, Suite 12
Wilmington, NC 2.8405
Subject: State Stormwater Management Permit No. SW8 050547
Wilmington International Airport EDDB
High Density Project
New Hanover County
Dear Mr. Dick:
The Wihmington Regional Office received a complete, iriodified State Stormwater Management Permit
Application for the subject project on October 5, 2020. Staff review of the plans and specifications has
determined that the project, as proposed, complies with the Stormwater Regulations set forth in Title 15A NCAC
02H.1000 (1995 Rules) and subsequently amended on January 1, 2017 (2017 Rules). We are hereby forwarding
modified Permit No. SW8 050547 dated October 6, 2020, for the construction of the built -upon areas (BUA) and
stormwater control measures (SCMs) associated with the subject project.
This permit shall be effective from the date of issuance until June 15, 2027 and the project shall be subject to the
conditions and limitations as specified therein and does not supersede any other agency permit that may be
required. Failure to comply with these requirements will result in future compliance problems. Please note that
this permit is not transferable except after notice to and approval by the Division.
Please refer to Attachment C for a detailed description of the current proposed major modification and a list of all
The past modifications approved during the effective period of the permit.
This cover letter, attachments, and all documents on file with DEMLR shall be considered part of this permit and
is herein incorporated by reference. Please add the attached plans to the previously approved plan set. Please
replace the previous application (SWU-101), supplement, operation and maintenance agreement with the
attached modified versions.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request
an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The
written petition must conform to Chapter I SOB of the North Carolina General Statutes and must be filed with the
OAH within thirty (30) days of receipt of this permit You should contact the OAH with all questions regarding
the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center,
Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless
such demands are made this permit shall be final and binding.
If you have any questions concerning this permit, please contact Garrett Zorda in the Wilmington Regional
Office, at [phone] or [e-mail].
Sincerely,
Brian Wrenn, Director
Division of Energy,. Mineral and Land Resources
Enclosures: Attachment A — Designer's Certification Form
Attachment C — Permitting History\
Application Documents
DES/gdz:%StormwaterTermits & Projects\2005\050547 HD\2020 10 permit 050547
North Carolina Department of Environmental Quality 1 Division of Energy, Mineral and land Resources
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E Wilmington Regional Office 1 l27 Cardinal Drive Extension Wilmington, North Carolina 284405
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State Stormwater Permit No. SW8 050547
Page 2 of 2
cc: Ramon Marconi, PE, Talbert & Bright, Inc.
New Hanover County Building Safety Department.
Wilmington Regional Office Stormwater File

State Stormwater Management Systems
Permit No. SW8 050547
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL RESOURCES
DIVISION OF ENERGY, MINERAL AND LAND RESOURCES
STATE STORMWATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
New Hanover County Airport Authority
Wilmington International Airport Extended Dry Detention Basin No. 1
1740 Airport Boulevard, Wilmington, New Hanover County
FOR THE
construction, operation and maintenance of an extended dry detention basin in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter collectively referred to as the "stormwaterrules') and the
approved stormwater management plans and specifications and other supporting data as attached
and on file with and approved by the Division of Energy, Mineral and Land Resources (the "Division"
or "DEMLR") and considered an enforceable part of this permit.
This permit shall be effective from the date of issuance until June 15, 2027, 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 1.7 of this permit. The "Phase I and II" stormwater control is an extended
dry detention basin that has been designed to handle the runoff from 8,520,835 square feet of
impervious area, including 2,223,812 sf. of future allocation, within a drainage area of 287.63
acres (12,529,107 sf). The "Overall" condition of the dry detention basin has been designed to
handle the runoff from 9,751,185 square feet of impervious area, including 3,454,162 sf. of
future allocation, within a drainage area of 322.34 acres (14,041,075 sf).
3. The tract will be limited to the amount of built -upon area indicated in Section 1.7 of this permit,
and per the application, the approved plans, calculations and other supporting documentation.
4. Where an individual project within the drainage area is being leased or sold, the stormwater
collection system for that project must be located in either dedicated common areas or
easements and the final plats will be recorded showing all such required easements.
5. The runoff from all built -upon area within the permitted drainage area of this project must be
directed into the permitted stormwater control system.
6. All development projects within the permitted contributing drainage area of the extended dry
detention basin BMP must submit plans to the Division for review and approval prior to
construction. Depending on ownership, a permit modification may or may not be required.
Page 1 of 4

State Stormwater Management Systems
Permit No. SW8 050547
7. That portion of the existing airport previously included in the drainage area of the permitted dry
detention basin that is being removed, must be submitted in a future permit application as a
modification or under Session Law 2012-200.
8. The following design criteria have been provided and must be maintained in the "Phase I and
II" extended dry detention basin and in the "Overall" extended dry detention basin.
Phase I & II Overall
a. Drainage Area, acres: 287.63 322.38
Onsite, ft2: 12,529,107 14,041,075
Offsite, ft2: 0 0
b. Total Impervious Surfaces, ft2: 8,520,835 9,751,185
C. Design Storm, inches: 4,552,087 @1" 4,552,087 @1 '
3,968,748 @1.5" 5,199,098 @1.5"
d. Basin Bottom Elevation, feet: 7.0 7.0
e. TSS removal efficiency: 50% 50%
f. Storage Elevation, FMSL: 13.0 13.3
g. Storage Surface Area, ft2: 506,082 602,325
h. Permitted Detention Volume, ft3: 1,058,112 1,274,829
i. Seasonal High Water Table, FMSL: 6.0 6.0
j. Controlling Orifice: 12.0" 0 12.0"0
k. Drawdown Time for 12.0" 0 orifice, hours: 57 64
I. Receiving Stream/River Basin: Smith Creek / Cape Fear
M. Stream Index Number: 18-74-63
n. Classification of Water Body: "C. Sw"
9. Tributary projects outside of the drainage area of the 2 "for -credit" grassed swales, but inside
the drainage area of the dry detention basin, must provide an additional BMP with a sufficient
TSS removal efficiency such that the total TSS removal, including the extended dry detention
basin, is at least 85%.
10. FAA requirements prohibit standing water (i.e., permanent pools) and stipulate that the design
storm must be fully drained within 48 hours. The approved BMP design includes a low flow
device but does not include a permanent pool at the low flow outlet or sediment storage below
the low flow outlet.
11. The "Phase I and II" condition will be the "permitted condition" until such time as a project
within the drainage area is proposed which shall cause the permitted maximum amounts of
drainage area and/or BUA for the Phase I & I I condition to be exceeded. Prior to construction
of that project, the "Overall" condition must be constructed and will become the permitted
condition.
II. SCHEDULE OF COMPLIANCE
The stormwater management system shall be constructed in its entirety, vegetated and
operational for its intended use prior to the construction of any built -upon surface. The Phase
& II condition.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the system
will be repaired immediately.
3. The facilities shall be constructed, operated and maintained in accordance with the provisions
of this permit, the approved plans and specifications, and the supporting documents attached
to this permit and on file with the Division.
4. 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.
Page 2 of 4

State Stormwater Management Systems
Permit No. SW8 050547
5. The permittee shall at all times provide the operation and maintenance necessary to assure
the permitted stormwater system functions at the design condition. The approved Operation
and Maintenance Plan must be followed in its entirety and maintenance must occur at the
scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment removal.
C. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, catch
basins and piping.
g. Access to the outlet structure must be available at all times.
6. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DEMLR. The records will indicate the date, activity, name of person
performing the work and what actions were taken.
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 permitted stormwater facilities shall be maintained via appropriate easements
(as required) at all times.
9. No person or entity, including the permittee, shall alter any component shown in the approved
plans and specifications. Prior to the construction of any modification to the approved plans,
the permittee shall submit to the Director, and shall have received approval for modified plans,
specifications, and calculations including, but not limited to, those listed below. For changes to
the project or SCM that impact the certifications, a new or updated certification(s), as
applicable, will be required and a copy must be submitted to the appropriate DEQ regional
office upon completion of the modification.
a. Any modification to the approved plans and specifications, regardless of size including
the SCM(s), BUA, details, etc.
b. Redesign or addition to the approved amount of BUA or to the drainage area.
C. Further development, subdivision, acquisition, lease or sale of any, all or part of the
project and/or property area as reported in the approved plans and specifications.
d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any
component of the approved SCM(s), the stormwater collection system and/or
vegetative conveyance shown on the approved plan.
e. The construction of any allocated future BUA.
f. The construction of any permeable pavement, #57 stone area, public trails, or
landscaping material to be considered a permeable surface that were not included in
the approved plans and specifications.
g. Other modifications as determined by the Director.
10. 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.
III. GENERAL CONDITIONS
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
Page 3 of 4

State Stormwater Management Systems
Permit No. SW8 050547
2. This permit is not transferable to any person or entity except after notice to and approval by
the Director. The permittee shall submit a completed and signed "Permit Transfer Application
Form" (available on the Division website) accompanied by the required fee and supporting
documentation as listed on the form, to the Division at least 60 days prior to any one or more
of the following events:
a. The sale or conveyance of the project area in whole or in part, except in the case of an
individual lot sale that is made subject to the recorded deed restrictions and protective
covenants;
b. Dissolution of the partnership, corporate, or LLC entity, subject to NCGS 55-14-05 or
NCGS 57D-6-07 and 08;
c. Bankruptcy;
d. Foreclosure, subject to the requirements of Session Law 2013-121;
3. Any individual or entity found to be in noncompliance with the provisions of this stormwater
management permit or the requirements of the Stormwater rules is subject to enforcement
procedures as set forth in NCGS 143 Article 21.
4. In the event that the facilities fail to perform satisfactorily 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 DEQ Staff permission to enter the property during normal business hours
for the purpose of inspecting all components of the permitted stormwater management facility.
6. The permit issued shall continue in force and effect until the permittee files a request with the
Division for a permit modification, transfer, renewal, or rescission; however, these actions do
not stay any permit conditions.
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 at all times.
9. The permittee is responsible for compliance with all permit conditions until such time as the
Division approves the transfer request. Neither the sale of the project, in whole or in part, nor
the conveyance of common area to a third party constitutes an approved transfer of the
stormwater permit.
10. The permittee shall submit a completed "Permit Information Update Application Form"
(available on the Division website) to the Division within 30 days to making any one or more of
the following changes:
a. A name change of the current permittee;
b. A name change of the project;
c. A mailing address change of the permittee;
11. A permit renewal request must be submitted at least 180 days prior to the expiration date of
this permit. The renewal request must include the appropriate application, documentation and
the processing fee as outlined in Title 15A NCAC 02H.1045(3).
Permit modified, updated and reissued this the 6th day of October 2020.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
gyu,�,�- ?1 n J
Brian Wrenn, Director
Division of Energy, Mineral and Land Resources
By Authority of the Environmental Management Commission
Page 4 of 4

State Stormwater Management Systems
Permit No. SW8 050547
Attachment C - Permitting History
Wilmington International Airport EDDB
Permit No. SW8 050547
Approval
Permit
RIMS
Description of the Changes
Date
Action
Version
This original issuance approved the 150 acre area
pocket of high density Phase I, in accordance with
6/15/2005
Original
1.0
SW8 040836, to be treated in an extended dry
Approval
detention basin (EDDB) #1 designed to handle the
runoff from 4,247,100 square feet of impervious
area.
Approved the modification of the permit to include
Phase II, which brought the total project area to
10/28/2009
Modification
1.1
264 acres and increased the size of the EDDB #1 to
handle a total of 8,468,064 square feet of
impervious area.
Approved the modification to include Phase III,
which brought the total project area to 321.35 acres
and increased the size of the EDDB #1 to handle a
10/26/2011
Modification
1.2
total of 8,468,064 square feet of impervious area.
This permit also took into account the impervious
area for SW8 060326 and SW8 060515, which
both drain to EDDB # 1 and were permitted as
Offsite permits to SW8 050547.
Approved the modification to the overall drainage
area to 3 22.3 8 acres and the increased size of
EDDB #1 to handle a total of 9,751,185 square feet
11/29/2012
Modification
1.3
of impervious area. This modification included the
addition of two grassed pre-treatment swales. This
issuance left 3,177,214 square feet of Future
allocation for the Phase I & II area.
Approved the reallocation of 205,202 square feet of
Plan
Future allocation for the development of the Rental
2/8/2013
Revision
1.4
Car Facility within the Phase I & II drainage area.
This issuance left 2,972,012 square feet of Future
allocation.
Approved the reallocation of 32,453 square feet of
Plan
Future allocation for the expansion of the North
8/4/2015
Revision
1.5
General Aviation Apron draining to EDDB # 1.
This issuance left 2,939,559 square feet of Future
allocation for the Phase I & II area.
Page 1 of 2

State Stormwater Management Systems
Permit No. SW8 050547
Approved the reallocation of a total of 129,082
square feet of future allocation, 62,570 square feet
Plan
for the Business Park access road and 66,512
9/9/2015
Revision
1.6
square feet for Lot 9 of the Business Park, both
draining to EDDB # 1. This issuance left 2,810,477
square fcct of Future allocation for the Phase I & II
area.
Approved the reallocation of 122,922 square feet of
future allocation for the North General Aviation
Hanger Taxi line and Corporate Hanger Complex.
6/29/2016
Plan
1
This also took into account the 24,190 square feet
Revision
'7
of impervious area allocated to SW8 150723,
which drains to EDDB # 1 and is permitted as an
Offsite permit to SW8 050547. This issuance left
2,663,295 square feet of Future allocation.
Approved the reallocation of 75,596 square feet of
8/22/2017
Plan
1'8
future allocation for the Avis Car Rental Facility
Revision
draining to EDDB #1. This issuance left 2,587,699
square feet of Future allocation.
Approved the reallocation of 29,337 square feet of
4/18/2018
Minor
1.9
future allocation for the Social Bark Kennel
Modification
draining to EDDB #1. This issuance left 2,558,362
square feet of Future allocation.
Approved the reallocation of 110,358 square feet of
10/5/2018
Minor
2.0
future allocation for the FBO #2 project draining to
Modification
EDDB #1. This issuance left 2,448,004 square feet
of Future allocation.
10/3/2019
Renewal
3.0
This issuance renewed Permit No. SW8 050547
until June 15, 2027.
Approved the reallocation of 224,194 square feet of
future allocation for the Air Carrier Apron
Expansion draining to EDDB # 1. This modification
Major
also adds Pre-treatment Swale #3 as pretreatment
10/6/2020
Modification
3 .:
for EDDB # 1. The submittal also included 9,268
square feet of impervious area that meets NCGS
143-214.7(c4) that does not drain to EDDB #1.
This issuance left 2,223,812 square feet of Future
allocation for the Phase I & 11 area.
Page 2 of 2

State Stormwater Management Systems
Permit No. SW8 050547
Wilmington International Airport
Stormwater Permit No. SW8 050547
New Hanover County
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.
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 1 of 2

State Stormwater Management Systems
Permit No. SW8 050547
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 drainage within the permitted contributing drainage area 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. 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. Required drawdown device is correctly located and sized per the approved plans.
13. All required design depths are provided.
14. All required parts of the system are provided, such as pretreatment devices, outlet
structure and/or forebay.
15. The required system dimensions are provided per the approved plans.
16. The maximum drainage area and/or built -upon area have not been exceeded for the
"Phase I & II" condition.
cc: NCDEQ-DEMLR Regional Office
New Hanover County Building Inspections
Page 2 of 2

Table in Form SWU-101, Section IV. 10.
SW8 050547
Basin Information
Receiving Stream Name
Overall
Drainage Area 1
Smith Creek
Phase I & II
Drainage Area
Smith Creek
Pretreatment Swale #3
Drainage Area
Smith Creek
Future Phase III
Drainage Area
Smith Creek
Stream Class
Stream Index Number
C, Sw
18-74-63
C, Sw
18-74-63
C, Sw
18-74-63
C, Sw
18-74-63
Total Drainage Area (sf)
On -site Drainage Area (sf)
Off -site Drainage Area (sf)
14,041,075
14,041,075
0
12,529,107
12,529,107
0
696,960
696,960
0
1,511,968
1,511,968
0
Proposed Impervious Area (sf)
% Impervious Area (total)
9,751,185
69.4%
8,520,835
68.0%
522,720
75.0%
1,230,350
81.4%
Impervious Surface Area
On -site Buildings/Lots (sf)
Overall
Drainage Area 1
0
Phase I & II
Drainage Area
0
Pretreatment Swale #3
Drainage Area
0
Future Phase III
Drainage Area
0
On -site Streets (sf)
4,252
4,252
4,252
0
On -site Parking (sf)
121,353
121,353
121,353
0
On -site Sidewalks (sf)
0
0
0
0
Other on -site (sf)
0
0
0
0
Future (sf)
3,454,162
2,223,812
298,528
1,230,350
Off -site (sf)
0
0
0
0
Existing BUA (sf)
6,171,418
6,171,418
98,587
0
Total (sf):
9,751,185
8,520,835
522,720
1,230,350

DEMLR USE ONLY
Pate Received I Fee Paid Permit Number
Applicablenules: ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction
(select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ Mgmt Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Air Carrier Apron Expansion Phase I at Wilmington International Airport
2. Location of Project (street address):
1740 Airnort Boulevard
City:Wilmington County:New Hanover Zip:28405
3. Directions to project (from nearest major intersection):
From the Martin Luther King Blvd/US 74 exit to N. 23rd St turn left onto N 23Rd St Travel appox 0.47
miles. Turn right onto Ain2ort Boulevard Main airport entrance). Project accces is a1212ox. 0.21 miles on the
right down the first gravel road (south of Gardner Road) Travel approx. 0.40 miles to project/gate entrance
4. Latitude:34° 15' 53" N Longitude:77° 54' 47" W of the main entrance to the project.
II. PERMIT INFORMATION:
1. a. Specify whether project is (check one): ❑New Modification ❑ Renewal w/ Modification+
tRenewals with modifications also requires SWU-102 - Renewal Application Form
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number SW8 050547 , its issue date (if known) October 3, 2019 , and the status of
construction: ❑Not Started ❑Partially Completed* ® Completed* *provide a designer's certification
2. Specify the type of project (check one):
❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from
DEMLR requesting a state stormwater management permit application, list the stormwater project number,
if assigned, n/a and the previous name of the project, if different than currently
proposed, n/a
4. a. 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):
❑CAMA Major
❑NPDES Industrial Stormwater
®Sedimentation/Erosion Control: 11.0 ac of Disturbed Area
0404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:Air Carrier Apron Expansion Phase I NEWHA-2020-013
5. Is the project located within 5 miles of a public airport? ❑No ®Yes
If yes, see S.L. 2012-200, Part VI: http://portal.ncdenr.org/web/Ir/rules-and-regulations
APR 21 2o2o
BY
Form SWU-101 Version Oct. 31, 2013 Page 1 of 6

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the12roject):
Applicant/Organization: New Hanover County Airport Authority
Signing Official & Title: Granseur Dick, PE, CM Facilities Director
b. Contact information for person listed in item la above:
Street Address:1740 Airport Bouleverd, Suite 12
City: Wilmington State: NC Zip: 28405
Mailing Address (if applicable): 1740 Airport Bouleverd, Suite 12
City: Wilmington State: NC Zip: 28405
Phone: (910 ) 341-4333 Fax: (910 ) 341-3465
Email: [e-mail]
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
❑ Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization:
Signing Official & Title:
b. Contact information for person listed in item 2a above:
Street Address:
City:
Mailing Address (if applicable):
City:
Phone: ( )
Email:
State: Zip:
State:
Fax:
Zip:
a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization: Ramon Marconi. PE / Talbert & Bright Inc
Signing Official & Title: Ramon Marconi, PE, Proiect Engineer
b. Contact information for person listed in item 3a above:
Mailing Address: 4810 Shelley Drive
City: Wilmington State: NC Zip: 28405
Phone: (910 ) 763-5350 Fax: [phone]
Email:[e-mail]
4. Local jurisdiction for building permits: New Hanover County
Point of Contact jgy Graham Phone #: (910 ) 798-7175
Form SWU-101 Version Oct. 31, 2013 Page 2 of 6

rV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
The project will be revising the drainage area to the exisiting permitted Extended Dry Detention Basin No 1
and adding an additional pretreatment swale (PreTreatment Swale #3) Project will utilize 224192 square
feet of the Weviso& permited allocated built -upon area under permit SW8 050547
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
Approval of a Site Specific Development Plan or PUD Approval Date:
❑ Valid Building Permit Issued Date:
❑ Other: Date:
b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
® Coastal SW -1995 ❑ Ph R - Post Construction
3. Stormwater runoff from this project drains to the Cape Fear River basin.
4. Total Property Area:1620.8 acres
5. Total Coastal Wetlands Area: n/a acres
6. Total Surface Water Area: n/a acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project
Area+:322.34 acres
+ Total project area shall be calculated to exclude the following: the normal pool of imimpoundedunded structures, the area
between the banks of streams and rivers, the area below the Normal High Water (N11K line or Mean High Water
(AffgM line, and coastal wetlands landward from the NHW (or MHM line. The resultant project area is used to
calculate overall percent built upon area (BLIAA). Non -coastal wetlands landward of the NHW (or MHK) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 69.4 %
9. How many drainage areas does the project have? 1 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below. Pretreatment
Overall Phase I & II C... ,! !) Future Phase III
Basin Information
Drainage Area 1
Drainage Area _
Drainage Area _
Drainage Area
Receiving Stream Name
Smith Creek
Smith Creek
Smith Creek
_
Smith Creek
Stream Class *
C, Sw
C, Sw
C, Sw
C, Sw
Stream Index Number *
18-74-63
18-74-63
18-74-63
18-74-63
Total Drainage Area (sf)
14,041,075
12,529,107
696,960
1,511,968
On -site Drainage Area (sf)
14,041,075
12,529,107
696,960
1,511,968
Off -site Drainage Area (sf)
0
0
0
0
Proposed Impervious Areas
9,751,185
8,520,835
522,720
1,230,350
Impervious Area"* total
69.4 %
68.0 %
75.0 %
81.4 %
Overall Phase I P. II Pre gwnla q Fntnre Phmco U]
Impervious' Surface Area
Drainage Area 1
Drainage Area _
Drainage Area,
Drainage Area
On -site Buildings/Lots (sf)
0
0
0
_
0
On -site Streets (sf)
4,252
4,252
4,252
0
On -site Parking (sf)
121,353
0
121,353
0
121,353
0
0
0
On -site Sidewalks (sf)
Other on -site (s
0
0
0
0
Future (sf)
3,454,162
2,223,812
298,528
1,230,350
Off -site (sf)
0
0
0
0
Existing BUA*** (sf)
6,171,418
6,171,418
98,587
1 0
Total (sf):
9,751,185
8,520,835
522,720
1 1,230,350
Stream Class and Index Number can be determined at: http://portal.ncdenr.org/web/wq[ps/csu/classi cations
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 Oct. 31, 2013 Page 3 of 6

'Report only that amount of existing BUA that will remain after development. Do not report any existing BLIA that
is to be removed and which will be replaced by new BUEl.
11. How was the off -site impervious area listed above determined? Provide documentation. Tributary area is
entirely on -site.
Proiects in Union County: Contact DEMLR Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that maybe subject to more stringent stormwater requirements as per 1 SA NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
fromhttp://portal.ncdenr.org/web/wq./ws/su/bM-manual.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and
Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application
instruction sheet and BMP checklists are available from
ht!p://portal.ncdenr.org/web/M/ws/su/statesw/forms does. The complete application package should be
submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the
interactive online map athttp://portal.ncdenr.org/web/wq/ws/su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from http://portal.ncdenr.org/web/wq/ws/su/statesw/forms does.
itials
1. Original and one copy of the stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
http://www.gnvhelp.org/-ages/onestopexpress.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/management
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within Y2 mile of the site boundary, include the Y2
mile radius on the map.
7. Sealed, signed and dated calculations (one copy).
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned proper ;T/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
Fonn SWU-101 Version Oct. 31, 2013 Page 4 of 6
for IQ

p. Vegetated buffers (where required).
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify --P A
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verify the SHWT prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: see attached Page No:
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC AIM
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item 1a, 2a, and/or 3a per 15A NCAC 2H.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
http: / /www.secretgU.state.nc.us/Corl2oratims/CSearch.g§Rx
VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from http://l2ortal.ncdenr.org/web/lr/state-stormwater-
forms does. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, 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 NC DEMLR, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer: Ramon Marconi, PE
Consulting Firm: Talbert & Bright, Inc.
Mailing Address: 4810 Shelley Drive
City: Wilmington
Phone: (910 ) 763-5350
Email:[e-mail]
State: NC Zip: 28405
Fax: (910 ) 762-6281
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a) , certify that I
own the property identified in this permit application, and thus give permission to (print or type name of person
listed in Contact Information, item 1a) with (print or type name of organization listed in
Contact Information, item 1a) to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version Oct. 31, 2013 Page 5 of 6

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back
to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and
submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating astormwater
treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility
without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement
action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
Date:
a Notary Public for the State of
do hereby certify that
County of
personally appeared
before me this _ day of and acknowledge the due execution of the application for a
stormwater permit. Witness my hand and official seal,
SEAL
My commission expires.
X. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in Contact Information, item 1a) Granseur Dick, PE, CM
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 the
applicable stormwater rules under 15A NC C 2H .1000 and any other applicable state stormwater requirements.
Signature: >
cf// 4!F (f /4
Date: 7/9(2-&W
I, IS a X M . Q aSK S a Notary Public for the
State of N0)'"k C CD1 IN, , County of
�,u� tAAw>J � do hereby certify that 06dn C : r- )Jt 6k- personally appeared
before me this -6 day of AVC I v'�0 and ackpowledge the due execution of the application for a
stormwater permit. Witness my hand and official seal, f V f ,
Air)sp- M
NOTARY
PUBLIC z
ti9 ��, i
tozR C��
NININ
SEAL
My commission expires I %� 1;-),V
Form SWU-101 Version Oct. 31, 2013 Page 6 of 6

Project Name:
Project Location:
Maintenance
Air Carrier Apron Expansion Phase 1
Wilmington International Airport
rviaur►enance recorus snail De Kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
location. Any deficient BMP elements noted in the inspection will be corrected, repaired, or replaced Immediately. These
deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include (check all that apply & corres
Bioretention Cell Quantity:
Dry Detention Basin Quantity:
Grassed Swale Quantity:
Green Roof Quantity:
Infiltration Basin Quantity:
Infiltration Trench Quantity:
Level SpreaderNFS Quantity:
Permeable Pavement Quantity:
Proprietary System Quantity:
Rainwater Harvesting Quantity:
Sand Filter Quantity:
Stormwater Wetland Quantity:
Wet Detention Basin Quantity:
Disconnected Impervious Area Present:
User Defined BMP Present:
onding
O&M tables wil
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
1
0
No
No
16171,
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Granseur Dick, PE. CM
Facilities Director, New Hanover County Airport Authority
1740 Airport Boulevard, Suite 12
Wilmington, NC 28405
[phone]
dickLN ilm.com
Signature: 1� L- ( l 2/ �dZ
p Date:
I, KD I V ` . '�l S -,a Notary Public for the State of }',JV '�{,� (04- 1 t kg. —
County of KVu, .k-A`,,Oje r , do hearby certify thhatt 1i1VdVJSrWr D ck I� ,CM
personally appeared before me this �� day of C IGl VV-k/L2c:k and
acknowledge the due execution of the Oper ns and Main nance Agreem t .
Witness m���irwd official seal, _ i
a NorARY BAN 2 9�Z(1
PUBLIC
y9y �. BY
d My commission expires
rrrrrom+�
STORM-EZ Version 7.4 12/11/2019
O&M Manual Page 1 of 2

-- __ raSS wa a ntenanee egu rementS
Important maintenance procedures:
- The drainage area of the grassed Swale will be carefully managed to reduce the sediment load to the grassed
Swale.
- After the first-time fertilization to establish the grass in the Swale, fertilizer will not be applied to the grassed
Swale.
The grassed swale will be inspected once a quarter. Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element:
Potential problem:
How to remedlate the problem:
The perimeter of the BMP
Areas of bare soil and/or
erosive gullies have formed.
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
long.
Maintain vegetation at a height of approximately six inches.
The entire length of the
Swale
Trash/debris is present.
Remove the trash/debris.
Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to remove the gully, and then re -sod (or
plant with other appropriate species) and water until established.
Provide lime and a one-time fertilizer application.
Sediment covers the grass at
the bottom of the swale.
Remove sediment and dispose in an area that will not impact streams
or BMPs. Re -sod if necessary.
Vegetation is too short or too
long.
Maintain vegetation at a height of approximately six inches.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
damage have occurred at the
Contact the local NC Department of Environment and Natural
Resources Regional Office.
outlet.
c1v
JAN 2 9 20Z0
BY_
STORM-EZ
12/11/2019
Version 1.4 O&M Manual Page 2 of 2

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
--1-]Project Name ----- -- -
--2 [Project Area (ac)— _ — _ _ _ . _ __._ -•-.---__-'
3 [Coastal Wetland Area (ac)
Surface Water Area (ac) — Is this Project High or Low Density?
Does this project use an off -site SCM?
COMPLIANCE WITH 02H .1003(4)Y —
_ 7 ! Width of vegetated setbacks provided (feet)-
9�S Will the vegetated setback remain vegetated?
_ A other that as listed in .1003(D c d) ciut of the setback?
10 I Is streambank stabilization proposed on this project? i
ILM Air Carrier Apron Expansion Phase I
0 for Swale (Overall Max DA). / 11.95 for Pro
No
Yes
Yes
No -
NUMBER AND TYPE OF SCMs: a r
€ 11
1 Infiltration System
! 12
_
IBioretention Cell
1 13
Wet_ Pond
14
Stormwater Wetland
!� 15
Permeable Pavement _
16
Sand Filter
17
—
JRainwater Harvesting ( EHJ_-
18
(Green Roof
19
—�-
JLevel Spreader -Filter Stri LS-FS
20
JDisconnected Impervious Surface DIS —
21
[Treatment Swale
22
23
Dry Pond
StorvnFllter —_--- - ---•---- .._:�
25
Bayfiker
26 IFilterra
— —
j
I FORMS LOADED
DESIGNER CERTIFICATION
27�Name and Title:
28 Organization: - -- — — —
29 Street address:
30 City, State, Zip: — -- _
32 !Email:
Ramon Marconi, PE / Project Engineer
T F _Talbert & Bripht, Inc._ ` -
- 4810 Shelly Drive
Wilmington, NC 28405 _
_...... ....... t910) 763-5350_..._._.........,.:..:...-.
Certification Statement
I cerfify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or
supervision; that the information provided in the form is, to the best of my knowledge and belief, truc, accurate, and complete; and
that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent
with the information provided here.
z a�
EP 2
Ogg5
�s� 9 s•.�FIVGIN�•. �V ``�
�4;, E
/f�111
Seal
Signature of Designer
Date
L;L.
a,

DRAINAGE AREAS
1 � Is this a high density project?
2 _ If so, number of drainage areas/SCMs
Is all/part of this protect subject to previous rule
3_ Iversions?
FORMS LOADED
AREA INFORMATION
4 ;Type of SCM
5 Total BUA in protect (sq ft)
1New BUA on subdivided lots (subject to permitting)
6 (sq ft)
Yes
No ! ? "
Overall _ ACLX 04
Entire Site
PreTreatment
Swale
522720 sf
propo eve fir-oi a J 're. he. bw R
1
PreTreatment
Swale
224192 sf
'New BUA outside of subdivided lots (subject to�
7 jperrritting) (sf)
8 I Offsite - total area(sqft)_
Offsite BUA (sq
10 iBreakdown of new BUA outside subdivided lots:
- Parking (sq ft) 121353 sf 121353 sf
- Sidewalk (sq ft)
— ; -Roof (sq ft)
^ _ Roadway (sg ft) _ - �- N 4252 sf 4252 sf
-Future (sq ft) 298528 sf
- Other, please specify in the comment box
below (sq ft�_ 113433 sf 113433 sf
New infiltrating permeable pavement on subdivided
_11 Ilots _(sq ft).._
New infiltrating permeable pavement outside of
12 subdivided lots (sq ft)
^I Exisitng BUA that will remain (not subject to _
13 ,permitting) (sq ft)
14 Existing BUA that is already permitted (sq ft)_---
15 Existing BUA that will be removed (sq ft) 14846 sf 14846 sf
16 I Percent BUA 75% 43%
17 Design storm (inches) .75 in_/hr 75 in/hr
18 aDesign volume of SCM (cu ft) 901 cf� 548 cf
19 iCalculation method for design volume Rational Method Rational Method
ADDITIONAL_ INFORMATION
,Please use this space to provide any additional information about the !
20 drainage area_(s):
Existing BUA to be treated and permitted, currently not permitted. _. p�1
J4N29 42 ::gay

TREATMENT SWALE
_1 iDrainag_e area number 3 -
2 jDesign volume of SC_M (cu ft)
GENERAL MDC FROM 02H .1050
i Is the SCM sized to treat the SW from all surfaces
3
lat build -out? Yes
4
_
Is the SCM located away from contaminated soils?
5
What are the side slopes of the SCM (H:V)? 'M ^ 5 1
Dces the SCN! "Eve retaining walls, gabion_walls or
6
other engineered side slopes? No
!Are the inlets, outlets, and receiving stream
7
I protected from erosion (10-year storm)? I Yes
8
Is there an overflow or bypass for inflow volume In
excess of the design volume? No
__ _"
What is the method for dewatering the SCM for
9
maintenance? ! Pump (preferred)
applicable, will the SCM be cleaned out after
10
Ilf
construction? I Yes
iM_D__C,(,8")_?_ - -- - _ _ _
Does the maintenance access comply with General11
Yes
_
Does the drainage easement mply cowith General�
IMDC
12
(9)? Yes
If the SCM is on a single family lot, does (will?) the
13 -plat
comply with General MDC (10)?
_
r
Is there an O&M Agreement that complies with-i
14
-15_
General MDC (11)? Yes_
_
Is there an O&M Plan that complies with General j
MDC (12)? Yes
- 16
Does the SCM follow the device specific MDC? — Yes - -
Was e��AA-designed by an licensed
17
professional? j Yes
TREATMENT
SWALE MDC FROM 02H .1061
18 ISHW_T
elevation (fmsl) _ 7
' -'
19
Bottom of the treatment swale (fmsl) 15.20
treatment swale (feet) _; 6 fit
Is swale trapezoidal in shape?-
20 I.Depthof
21
- 22
Width of bottom of swale (feet)—`6 fit
23
Side slopes of treatment swale (H:U)_ — I- * 5:1
24
Length of swale (feet)
_
25
Flow depth during the 0.75 inch/hour storm (inches) 5.64 in
Velocity during the 0.75 inch/hour storm (feet per ":----'-•-__..-.._.--._
26 'second)
27
` 2.27 cfs
Hydraulic retention time for swale ((minutes) 4 95 min
28
Species of grass that will be used �- Bermuda Grass
i
I6
Will the grass be maintained at an average height of.'-
29
inches?
TO-1Will
the_ grass not 6e cut lower than _4 inches?
i
Velocity during the 10-year storm (feet per second) 4.29 fUs
—Y
_.
jWdfineasures_betaken to preverit erosion cE rmg
32 'the 10-year storm? I Yes
_
ADDITIONAL INFORMATION-�
I Please use this space to provide any additional
33 information about the treatment swale(s):
J
8Y•.�
AN 2 9 2020

DE1YfLR USE ONLY
Date Aeceived
Fee Paid
Permit Number
ao a©
:It 7 `-=
I SW & O
Applicable Rul s: I ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph Il - Post Construction
(select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ Mgmt Plan:
State of North Carolina [-'ECr—JVDelpartment of Environment and Natural Resources E0
Division of Energy, Mineral and Land Resources /
� ,��? Z i fv�f
STORMWATER MANAGEMENT PERMIT APPLICATION F - .._.. .
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Air Carrier Apron Expansion Phase I at Wilminp-ton International Airport
2. Location of Project (street address):
1740 Airport Boulevard
City -.Wilmington County:New Hanover Zip:28405
3. Directions to project (from nearest major intersection):
From the Martin Luther King Blvd/US 74 exit to N. 23rd St turn left onto N 23Rd St Travel appox 0.47
miles. Turn right onto Airport Boulevard (Main airport entrance) Project accces is appox 0.21 miles on the
right down the first gravel road (south of Gardner Road). Travel approx. 0.40 miles to project/gate entrance
4. Latitude:34° 15' 53" N Longitude:77° 54' 47" W of the main entrance to the project.
II. PERMIT INFORMATION:
1. a. Specify whether project is (check one): ❑New ®Modification ❑ Renewal w/ Modificationt
tRenewals with modifications also requires SK i 102 - Renewal Application Form
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number SW8 050547 , its issue date (if known) October 3, 2019 , and the status of
construction: ❑Not Started ❑Partially Completed* ® Completed* *provide a designer's certification
2. Specify the type of project (check one):
❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other
3. If this application is being submitted as the result of a previously returned application or a letter from
DEMLR requesting a state stormwater management permit application, list the stormwater project number,
if assigned, n/a and the previous name of the project, if different than currently
proposed, n/a
4. a. 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: 11.0 ac of Disturbed Area
❑NPDES Industrial Stormwater ❑404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:Air Carrier Apron Expansion Phase I, NEWHA-2020-013
5. Is the project located within 5 miles of a public airport? ❑No ®Yes
If yes, see S.L. 2012-200, Part VI. http://portal.ncdenr.org/web/Ir/rules-and-regulations
Form SWU-101 Version Oct. 31, 2013 Page 1 of 6

III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the project):
Applicant/Organization: New Hanover County Airport Authority
Signing Official & Title: Granseur Dick, PE, Facilities Director
b. Contact information for person listed in item 1a above:
Street Address:1740 Airport Bouleverd, Suite 12
City: Wilmington State: NC Zip: 28405
Mailing Address (if applicable): 1740 Airport Bouleverd, Suite 12
City: Wilmington
Phone: (910 ) 341-4333
Email: gdick®flyilm.com
State: NC
Zip: 28405
Fax: (910 ) 341-3465
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
❑ Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization:
Signing Official & Title:_
b. Contact information for person listed in item 2a above:
Street Address:
City: State: Zip:
Mailing Address (if applicable):
City: State: Zip:
Phone: ( ) Fax: ( )
Email:
3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization: Ramon Marconi. PE / Talbert & Bright Inc
Signing Official & Title: Ramon Marconi, PE, Project Engineer
b. Contact information for person listed in item 3a above:
Mailing Address: 4810 Shelley Drive
City: Wilmington State: NC Zip: 28405
Phone: (910 ) 763-5350 Fax: (910 ) 762-6281
Email:rmarconi®tbiilm.com
4. Local jurisdiction for building permits: New Hanover County
Point of Contact:)ay Graham Phone #: [phone]
APR 2 1 MQ
Form SWU-101 'Version Oct. 31, 2013 Page 2 of 6 BYE

PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
Theyroiect will be revising the drainage area to the exisiting permitted Extended Dry Detention Basin No.1,
and adding an additional pretreatment swale (PreTreatment Swale #3). Project will utilize 224192 square
feet of the previsouly_permited allocated built -upon area under permit SW8 050547
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
Approval of a Site Specific Development Plan or PUD Approval Date:
Valid Building Permit Issued Date:
Other: Date:
b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
® Coastal SW -1995 ❑ Ph II - Post Construction
3. Stormwater runoff from this project drains to the Cape Fear River basin.
4. Total Property Area:1620.8 acres
5. Total Coastal Wetlands Area: n/a acres
6. Total Surface Water Area: n/a acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project
Area+:322.34 acres
+ Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal High Water (N� line or Mean High Water
(MHVV) line, and coastal wetlands landward from the NHW (or MHV� line. The resultant project area is used to
calculate overall percent built upon area (BLIA). Non -coastal wetlands landward of the NHW (orMHV11) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 69.4 %
9. How many drainage areas does the project have? 1 (For high density, count I for each proposed engineered
stormwater BMP. For low density and other projects, use I for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below. Pretreatment
Overall Phase I & II c.... I— n Futiira Phnco III
Basin Information
Drainage Area 1
Drainage Area _
Drainage Area
Drainage Area
Receiving Stream Name
Smith Creek
Smith Creek
_
Smith Creek
_
Smith Creek
Stream Class *
C, Sw
C, Sw
C, Sw
C, Sw
Stream Index Number *
18-74-63
18-74-63
18-74-63
18-74-63
Total Drainage Area (sf)
14,041,075
12,529,107
696,960
1,511,968
On -site Drainage Area (sf)
14,041,075
12,529,107
696,960
1,511,968
Off -site Drainage Area (sf)
0
0
0
0
Proposed Im ervious Area's (so 1
9,751,185
8,520,835
522,720
1,230,350
% Impervious Area** total
69.4 %
68.0 %
75.0 %
81.4 %
Overall Phase I & II Pre Swale 3 Future Phase III
Impervious' Surface Area
Drainage Areal
Drains a .Area _
Drama a Area _
Drainage Area
On -site Buildings/Lots (sf)
0
0
0
_
0
On -site Streets (sf)
4,252
4,252
4,252
0
On -site Parking (sf)
121,353
121,353
121,353
0
On -site Sidewalks (so
0
0
0
0
Other on -site (sf)
0
0
0
0
Future (sf)
3,454,162
2,223,812
298,528
1,230,350
Off -site (sf)
0 1
0
1 0
0
Existing BUA*** (sf)
6,171,418
6,171,418
98,587
0
Total (sf):
9,751,185
8,520,835
522,720
1,230,350
T Stream Class and index Number can be determined at: http. portal.ncdenr.or /wg eb/wq&s/csu/classifications
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 Oct. 31, 2013 Page 3 of 6

'Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that
is to be removed and which will be replaced by new BUA.
11. How was the off -site impervious area listed above determined? Provide documentation. Tributary area is
entirely on -site.
Proiects in Union County: Contact DEMLR Central Ojjice staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent stormwater requirements as per 1 SA NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
from htt2://portal.ncdenr.org/web/wq/ws/su/bmp-manual.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and
Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application
instruction sheet and BMP checklists are available from
h!tg://portal.ncdenr.org/web/wq/ws/­su/statesw/forms dots. The complete application package should be
submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the
interactive online map athlip://portal.ncdeirir.org/web/wq/ws/su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from http://portal.ncdenr.org/web/wq/ws/su/statesw/forms does.
.tials
1. Original and one copy of the Stormwater Management Permit Application Form. 642,
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants LA
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
http://www.envhel�org/pages/onestopexRress.hbnl for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional i-nformatioit and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/management
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2
mile radius on the map.
7. Sealed, signed and dated calculations (one copy).
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the bar Ks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
for
k. Existing contours, proposed contours, spot elevations, finished floor elevations.lee
1. Details of roads, drainage features, collection systems, and stormwater control measures. 42- Or ., ..-A
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who APR 2 2020 i
made the determination on the plans.
n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations. BY i
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
Form aVVU-101 Version Oct. 31, 2013 Page 4 of 6

p. Vegetated buffers (where required). G�
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify G
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verify the SHWT prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: see attached Page No:
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item 1a, 2a, and/or 3a per 15A NCAC 2H.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
hffp://www.secretaiy.state.nc.us/Corporations/CSearch.aspx
VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from http://12ortal.ncdenr.org/web/lr/state-stormwater-
forms does. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, 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 NC DEMLR, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer: Ramon Marconi, PE
Consulting Firm:_ Talbert & Bright, Inc.
Mailing Address: 4810 Shelley Drive
City: Wilmington State: NC Zip: 28405
Phone: (910 ) 763-5350 Fax: (910 ) 762-6281
Email:[e-mail]
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a) . certify that I
own the property identified in this permit application, and thus give permission to (print or type name of person
listed in Contact Information, item 1a) with (print or type name of organization listed in
Contact Information, item 1a) to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version Oct. 31, 2013 Page 5 of 6

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back
to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and
submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater
treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility
without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement
action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
I,
a Notary Public for the State of
do hereby certify that
before me this _ day of
Date:
County of
personally appeared
, and acknowledge the due execution of the application for a
stormwater permit. Witness my hand and official seal,
SEAL
My commission expires
X. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in Contact Information, item 1a) Granseur Dick, PE, CM
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 the
applicable stormwater rules under 15A NC C 2H .1000 and any other applicable state stormwater requirements.
Signature:
R,! CM Date: ��zo Z C%
d > � �
I, RD � r 1 ' • 1✓ a,6 S a Notary Public for the State of Newik 1, ral w, , County of
do hereby certify that 'YaVlS' ur NG�. personally appeared
before me this 1 day of C SMY3 and acknowledge the due execution of the application for a
stormwater permit. Witness my hand and official seal, t
NOTARY
PUBLIC
OVER GG19
Form SWU-101 Version Oct. 31, 2013
SEAL
My commission expires , chi'
ea A"M
rtl.�'. -.
APR' 10
8Y,• r
Page 6 of 6

Project Name:
Project Location:
reement
Air Carrier Apron Expansion Phase 1
Wilmington International Airport
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
location. Any deficient BMP elements noted in the inspection will be corrected, repaired, or replaced immediately. These
deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include (check all that apply & cc
Bioretention Cell
Quantity:
Dry Detention Basin
Quantity:
Grassed Swale
Quantity:
Green Roof
Quantity:
Infiltration Basin
Quantity:
Infiltration Trench
Quantity:
Level SpreaderNFS
Quantity:
Permeable Pavement
Quantity:
Proprietary System
Quantity:
Rainwater Harvesting
Quantity:
Sand Filter
Quantity:
Stormwater Wetland
Quantity:
Wet Detention Basin
Quantity:
Disconnected Impervious Area
Present:
User Defined BMP
Present:
ng O&M tables wil
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
Location(s):
oe aaaea a
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
* Responsible Party:
Title & Organization:
Street address:
City, state, zip:
Phone number(s):
Email:
Granseur Dick, PE, CM
Facilities Director, New Hanover County Airport Authority
1740 Airport Boulevard, Suite 12
Wilmington, NC 28405
[phone]
[e-mail]
Signature: cz� �Pz-
Date: 02a
I, a0, Vi S a Notary Public for the State of I r )el -
County of do hearby certify that
V(-!:A—
L j,L E Ll�
personally appeared before me this l day of X-Y�.tG. (- y— . �Q c� and
acknowledge the due execution of the Operatiggs and Mainlonance Agreement .
Witness my hand and official seal, 0.
.�
NIIIINIgI
was oq�
NOTARY
PUBLIC
3 rt�
ti
�� I
Seal Pve CD MY commission expires
STORM-EZ 12/11/2019
Version 1.4 O&M Manual Page 1 of 2

Grassed ware Maintenance Re au cements
Important maintenance procedures:
_ The drainage area of the grassed swale will be carefully managed.to reduce the sediment load to the grassed
swale.
After the first-time fertilization to establish the grass in the swale, fertilizer will not be applied to the grassed
swale.
The grassed swale will be inspected once a quarter. Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element:
Potential problem:
Flow to remediate the problem:
The perimeter of the BMP
Areas of bare soil and/or
erosive gullies have formed.
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
long.
Maintain vegetation at a height of approximately six inches.
The entire length of the
Trash/debris is present.
Remove the trash/debris.
swale
Areas of bare soil and/or
erosive gullies have formed.
Regrade the soil if necessary to remove the gully, and then re -sod (or
plant with other appropriate species) and water until established.
Provide lime and a one-time fertilizer application.
Sediment covers the grass at
the bottom of the swale.
Remove sediment and dispose in an area that will not impact streams
or BMPs. Re -sod if necessary.
Vegetation is too short or too
long.
Maintain vegetation at a height of approximately six inches.
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose of the sediment off -site.
The outlet device is damaged
Repair or replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Department of Environment and Natural
damage have occurred at the
Resources Regional Office.
outlet.
STORM-EZ 12/11 /2019
Version 1.4 O&M Manual Page 2 of 2

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
:PROJECT INFORMATION
1 1 Pro ect Name
j—__ _ __— —!_ ILM Air Carrier Apron Ex
2 i Project Area ac Max D
-- .—
3 Coastal Wetland Area (ac) i 0
4 Surface Water Area c (a
—� 0
5 .Is this project High or Low Density?
6 i Does this 1ro ect use an off -site SCM?
.-----i--- - P - 1 E90
COMPLIANCE WITH 02H .1003(4)
_ 7 (Width of vegetated setbacks provided (feetZ 50
d; 8 Will the vegetated setback remain vegetated? --- T_Yes
" 9 Is BUA other that as listed in .1003(4)(c d out of the setback? Yes
;, 10 -is streambank stabilization proposed on this project? I No
/ 11.95 for
NUMBER AND TYPE OF SCMw
11 Infiltration System
12 ,BI ioretention Cell _.__----•-
-:.-----_
13
(Wet Pond
i __._...._...._ .. ._.___-__._.
14
z 15
'
;Stormwater Wetland
(Permeable Pavement
ISand Filter
i
i
_._...
_16
f
17
Rainwater Harvesting RWH
18
JGreen Roof
a
19
20
21 (Treatment
Ttvel S reader -Filter Strip (LS-FS)
Disconnected Impervious Surface DIS
Swale
22_
Dry Pond
23
StormFilter—__—
—'
-._..._� ---•_— �__
24
Silva Ce01.--._-
—_—_ _
!__--
-
-
28
_
FORMS LOADED
T10N
28 iO gr anization:— - —�� _ — — _j- Talbert & Bright. Inc.
29 Street address:— _ I -y ~-- 4810 Shelly Drive
30 JCity, State, Zip:
31 1Phone numbers):(910 763-5350-
32 I Email: I -- rmnrmniMhillm mm
Certffication Statement
I certify, under penalty of law that this Supplement-FZ form and all supporting information were prepared under my direction or
supervision; that the information provided in the form ;3, to the best of my knowledge and belief, true, accurate, and complete: end
that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent
with the information provided here.
``����• GA•RO4
R- FE SI
• r.
034503
�i� y•FNGIN;;.•'�V����
�ito
s��'ON E 1 fill iM, %
1
Signature of Designer'~
Date

DRAINAGE AREAS
1 j Is this a high density project?
_2 i If so, -number of drainage are, as/SCM_s_y
i Is all/part of this project subject to previous rule
3 versions?
FORMS LOADED
Yes
1
No
�ver�El 0A
Pi,; e,Qa
__
DRAINACaE AREA INFORMATION
Entire Site
1
I
PreTreatment
PreTreatment
4
Type of SCM
Swale
Swale
5 Total_ BUA in project (sq.ft) _
52272. 0 sf
224192 sf
- _ _
I New BUA on subdivided lots (subject to permitting)
New BUA outside of subdivided lots (subject to
permitting) (sf)
_7_
8_ fOffsite -total area (sq ft),
_
BUA (sq ft _
_-9_IOffsite
10
Breakdown of new BUA outside subdivided lots:
121353 sf
121353 sf
Parking_(sq ft)
_ _ _
Sidewalk (sq ft)
- Roof (sq ft)
- Roadway s� ft)
4252 sf
4252 sf
_: r _�
Future (sq ft)
298528 sf
_ ._ _
- Other, please specify in the comment box
_
below (sq ft) _ _ _
113433 sf
113433 sf
infiltrating permeable pavement on subdivided
lots (sq ft)_`
_11_�New
New infiltrating permeable pavement outside of
12 (subdivided
lots (sq ft)_
_
Exisitng BUA that will remain (not subject to
13___
permitting) (sq ft)_
14
Existing BUA that is already permitted (sq ft)
_
15 ,Exist ng�BUA that will be removed (sq ft)
14846 sfl
14846fsfv
16 I
Percent BUA
75%
43%
17 jDesign storm (inches)
.75 in/hr _
.75 in/hr�
18 iDesign volume of SCM_(cu ft)�
901 cf W�
548 cf -�
1alculation method for design volume
Rational Method
Rational Method
ADDITIONAL_ INFORMATION
j
Please use this space to provide any additional information about the
20
drainage area(s_):
Existing BUA to be treated and--_.�-_e_.� - permitted; currently not permitted.
permitted_

TREATMENT SW_ AL_E__ _
1 Dra_hag_earea number
f D
_ 2 esign_volume of SCM (cu ft)
3 lIs the SCM sized to treat the SW from all surfaces j
at build -out? I
4 lis the SCM located away from contaminated soils? l
-_5• tl What are the side 'slopes of the SCM (H:V)?
Does the SCM have retaining walls, gabion walls or
_6 other engineered side slopes? _
Are the inlets, outlets, and receiving_ st_ream -!
_7 protected from erosion (10-year storm)?
- Ils there an overflow or bypass for inflow volume in `
8 excess of the design volume? _
9 1WIis the method for dewatering the SCM for
ii-fmaintenance? Pump
If applicable, will the SCM be cleaned out after ,
_ 10 construction?
11 !Does the maintenance access comply with General
_ MDC (8)? _
Does the drainage easement comply with General -�
_ 12 (MDC (9)?
_ If the SCM is on a single family lot, -does (will?) the
13_ plat comply with General MDC (10)?
14 lIs there an O&M Agreement that complies with
General MDC (11)? _
Is there an O&M Plan that complies with General
_ 15 1MDC (12)?
16 Does the SCM follow the device specific MDC? -
--TVV'E s the TCM7cresigned by an NC licensed "-"--
17 1 professional?
TREATMENT;
SWALE, MDC FRC
_18
JSHWT elevation (fmsl)
19
_20
21-
_22
I Bottom of the treatment si
Depth of treatmt le swa
en
1Is swale trapezoidal in sh,
Width of bottom of swale,
23
Side slopes of treatment
24
Length of swale (feet)
ale (H:V)
Yes
Yes
5511
No
Yes
No
(pre!
Yes
Yes
Yes
Yes
Yes
Yes
Yes
15-20
25 1 Flow depth during the 0.75 inch/hour storm (inches) _ 5.64 in
!Velocity during the 0.75 inch/hour storm (feet per
26 second) 2.27 cfs
27 Hydraulic retention time for Swale (minutes) _ i 4'95 min
28 `[Species of grass that will be used _ Bermuda Grass
Will the grass be rnamainavera ted'at an ge height of`•:
_ 29 6 inches? i Yes
- 30 Will the grass not be cut lower than 4 inches? -.- i Yes .
_ 31 ( Velocity during the 10-year storm (feet per second) _ _-4 29 ft/s
32 IWildmeasures be taken to prevenf erosion3uring -!'
.the 10-year storm? Yes
ADDITIONAL INFORMATION
33 I Please use this space to provide any additional
information about the treatment swale(s):

5410 Trinity Road
TIC► MONS GROUP Suite102
YOUR VISION ACHIEVED THROUGH OURS. Raleigh. NC 27607
TO:
TRANSMITTAL,
NCDEQ — Christine Hall
Stormwater Department
127 Cardinal Drive Extension
Wilmington, NC 28405
P 919.866.4951
F 919.859.5663
www.timnwns.com
Date: 10/2120 Job#: 37630.054
Circle K — NTI Airport Blvd Wilmington —
Project: NC.115
Reference:
Copies Sent To:
COPIES
DATE
NUMBER
DESCRIPTION
2
10/2/2020
1
Stormwater Management Permit Application
2
10/2/2020
2
Deed Restrictions and Protective Covenants Form
1
10/2/2020
3
SCM Supplements Forms
1
10/2/2020
4
Permit Application Fee Check $505 Check #: 87813
1
10/2/2020
5
Detailed Narrative
1
10/2/2020
6
USGS Ma
1
10/2/2020
7
Calculations Package included SHWT report)
2
10/2/2020
8
Folded 24" x 36" plans
1
10/2/2020
9
Copy of Property Deed
1
10/2/2020
10
NC Secretary of State Registration — Circle K Meredith W Rice
1
10/2/2020
11
Property Agreement between County and Airport
1
10/212020
12
O&M Agreements
1
10/2/2020
13
ILM Stormwater Master Plan
1
10/2/2020
14
Wetlands Documentation
1
10/2/2020
15
CD containing dfs of all documents
THESE ITEMS ARE TRANSMITTED:
If enclosures are not as noted, please notify us at once.
COMMENTS:
Thank You,
Brian Downs
Project Manager
Timmons Group
CIVIL ENGINEERUNG i ENVIROWIENTAL I SURVEYIF;G I GIS I LANDSCAPE ARCHITECTURE j CONSTRUCTION SERVICES

TALBERT & BRIGHT, INC.
ENGINEERING & PLANNING CONSULTA
LETTER OF TRANSMITTAL
To: NC Division of Environmental Quality
Land Resources
127 Cardinal Drive Ext, Wilmington, NC 28405
WE ARE SENDING YOU:
❑ Shop Drawings
❑ Copy of Letter
® Attached
❑ Prints
❑ Change Order
�0
OCT 05 2020
;[§_ V`
Date: 10/05/20 Pro'. No. 3301-1702
Attention: Garrett Zorda
Re: Wilmington International Airport
Air Carrier Apron Expansion Phase 1
Stormwater Permit Modification —
Permit No. SW8 050547
❑
Under Separate Cover via
®
Plans
❑
Other
the following items:
❑ Specifications
ITEM
DATE
NO.
DESCRIPTION
1
Second copy of revised plans and documentation:
1
• TBI response letter dated July 20, 2020 to NCDEQ comment letter dated July 20, 2020
1
• updated table in form SWU-101, Section IV. 10
1
• stand-alone updated table from form SWU-101, Section IV. 10 sent electronically on July
17, 2020
1
• Revised full size plan sheet C1
1
• Revised full size plan sheet ESC3
THESE ARE TRANSMITTED, as checked below:
®
For Approval
❑
No Exception taken
❑
For your Use
❑
Make Corrections Noted
❑
For Review and Comment
❑
Amend and Resubmit
❑
As Requested
❑
Rejected — See Remarks
❑
FOR BIDS DUE ON
REMARKS
❑
Resubmit
Copies for Approval
❑
Submit
Copies for Distribution
❑
Return
Corrected Prints
❑
Prints Returned After Loan to Us
❑
Other
COPY TO Granseur Dick, PE (half size plan sheets) SIGNED Ray Marconi, PE
ENGINEERING & PLANNING CONSULTANTS
4810 Shelley Drive Wilmington, NC 28405 910.763.5350 FAX [phone]

Zorda, Garrett D
From: Zorda, Garrett D
Sent: Friday, October 2, 2020 11:27 AM
To: Ray Marconi; Granseur Dick ([e-mail])
Subject: Wilmington International Airport EDDB (SW8 050547) - Request for Additional
Information
Good Morning All,
I am finishing reviewing the additional information received on July 20, 2020 for the subject project. Everything looks
mostly good to go, however, only one set of the revised plans were submitted. In order to ensure the permittee received
an approved copy of the plans, it is necessary to submit two (2) copies of all revised plans and documentation. As such,
can you please submit a second copy of the revised plans?
With that said, I will begin drafting the permit so that once the revised plans are received, it should be mostly ready to
go. Please ensure the requested information is received by October 19, 2020. In the meantime, if you have any
questions or concerns, please let me know.
Thanks,
Garrett Zorda
Environmental Engineer
Division of Energy, Mineral and Land Resources State Stormwater Program
Department of Environmental Quality
910 796 7215 office
910 796 7343 direct —Please note the change to my direct phone number"*
garrettzordaancdenr.gov
127 Cardinal Drive Ext.
Wilmington, NC 28405
N C�FCn.3rw
111A id th w�e�r
mil C!.'. . _.. 7 ihiS i[. d!'eSS 7S SllbjfF -,t 10 tllr?
ar)d fr � y be (l;. s it15 du .+laird parties.

North Carolina Secretary of State Search Results
Page 1 of 3
• File an Annual Report/Amend an Annual Report • Upload a PDF Filing • Order a Document Online • Add
Entity to My Email Notification List • View Filings • Print a Pre -Populated Annual Report form
Business Corporation
Legal Name
Circle K Stores Inc.
Prev Legal Name
Circle K Convenience Stores, Inc.
Prev Legal Name
The Circle K Corporation
Information
Sosld: 0176043
Status: Current -Active O
Date Formed: 10/25/1985
Citizenship: Foreign
State of Incorporation: TX
Fiscal Month: April
Annual Report Due Date: August 15th
Registered Agent: Corporation Service Company
Addresses
Mailing
1130 West Warner Road, Building B
Tempe, AZ 85284-2816
Reg Office
2626 Glenwood Avenue, Suite 550
Raleigh, NC 27608-1370
Officers
Principal Office
1130 West Warner Road, Building B
Tempe, AZ 85284-2816
Reg Mailing
2626 Glenwood Avenue, Suite 550
Raleigh, NC 27608-1370
https://www.sosnc.gov/online services/search/Business Registration Results 9/2/2020

North Carolina Secretary of State Search Results
Page 2 of 3
Assistant Secretary Senior Vice President Vice President
Kimberly Andrews Brian Bednarz Rodney Blanton
5500 S Quebec St. Suite 100 25 W. Cedar Street, Suite 100 2440 Whitehall Park Dr
Greenwood Village CO 80111 Pensacola FL 35202 Charlotte NC 28273
Assistant Secretary Senior Vice President
Aaron Brooks Kathy Cunnington
305 Gregson Dr. 1130 West Warner Road Building B
Cary NC 27511 Tempe AZ 85284
Treasurer
Kathy Cunnington
1130 West Warner Road Building B
Tempe AZ 85284
Assistant Secretary
Mike Foster
2440 Whitehall Park Drive, Suite 800
Charlotte NO 28273
Assistant Secretary
Kim Kwiatkowski
1130 West Warner Road, Building B
Tempe AZ 85284
Assistant Secretary
Sarah Longwell
495 E Rincon, suite 150
Corona CA 92879
President
Kathy Cunnington
1130 West Warner Road Building B
Tempe AZ 85284
Secretary
KATHY C. CUNNINGTON
1130 WEST WARNER ROAD
TEMPE AZ 85284
Assistant Secretary
Edward Giunta
12911 N Telecom Parkway
Tampa FL 33637
Vice President
Luc Langevin
12911 N. Telecom Parkway
Tampa FL 33637
Vice President
Matt Mccure
2440 Whitehall Park Drive Suite 800
Charlotte NC 28273
Vice President
David G Morgan
12911 N Telecom Parkway
Tampa FL 33637
Vice President
Mark Ostoits
2550 West Tyvola road Suite 200
Charlotte NC 28217
Executive Officer
Darrell Davis
12911 N. Telecom Parkway
Tampa FL 33637
Assistant Secretary
Randy Horne
25 W Cedar Street Suite 100
Pensacola FL 32502
Assistant Secretary
John Little
305 Gregson Drive
Cary NO 27.911
Executive Officer
Alex Miller
1130 West Warner Road Building B
Tempe AZ 85284
Assistant Secretary
Patrick Panzarella
19500 Bulverde Road
San Antonio TX 78259
https://www.sosnc.gov/online services/search/]3usiness Registration Results 9/2/2020

North Carolina Secretary of State Search Results
Page 3 of 3
Vice President
Trey Powell
25W. Cedar Street, Suite 100
Pensacola FL 35202
Vice President
Meredith Will Rice , Jr.
1100 Situs Court Suite 100
Raleigh NC 27606
Senior Vice President Vice President
Dennis Tewell Tim Tourek
1130 West Warner Road, Building B 255 E.Rincon Suite 100
Tempe AZ 85284 Corona CA 92879
Stock
Class: COMMON
Shares: 12000000
Par Value 1
Vice President
Mark Tate
5500 S Quebec St. Suite 100
Greenwood Village CO 80111
Assistant Secretary
Valery Zamuner
4204 Boulevard Industriel
Laval XX H7LOE3
https://www.sosnc.gov/online services/search/Business Rcgistration_Results 9/2/2020

Johnson. Ke
From: Johnson, Kelly
Sent: Thursday, August 27, 2020 12:41 PM
To: 'Stephen Ballentine'
Cc: Snider, Holley, Hall, Christine; Norris, Kellie E
Subject: FW: [External] .054 Airport Blvd - SCM Coordination with NCDEQ Stormwater Express
Review Application Questions
Attachments: SSW-SWU-101-Application-DEMLR-SPU Oct 2013.doc; Stormwater Supplement - Dry
Detention Basin - Phase 3A.xls; O&M Agreement - Dry Pond - Phase 3A.doc; Sheet C2.0
Overall Basin Map ILM Flex Space 2015-07-16.pdf
Holley,
I believe you are handling wetlands now? Mr. Ballentine needs to impact wetlands at the airport. I do not Know if that
would be DWR or the CORPs? See #7 below. If you are not the correct contact, can you please direct him to the
appropriate person?
Stephen,
This is quite a lot of information. It sounds like you want to build a Circle K inside the airport's property and then modify
some of the systems under the airport's agreement from years ago. Are you saying that there was a proposed
stormwater configuration for Phase 3 and that your proposal will re -design Phase 3? You mention "a portion of Phase
3", so what will happen to the portion of Phase 3 that you aren't changing? I do not know the details of the airport's
agreement (and I am not at the office), but I am assuming that the "2 new pre-treatment swales in series with 2 new
extended dry detention basins" is an unusual treatment system that that agreement allows. I have cc'd Christine Hall
and Kellie Beth Norris who work in the Express Program. They can weigh in on whether or not this would be eligible for
Express, as that program doesn't generally review projects with unusual treatment.
As for your questions:
1. Application: I have not gone through the details of the attachments, but if you used the "New Permit/ Maw
Modification Form" then that is the correct one. You only need one application for the modification regardless
of the number of systems that will change.
2. BMP/SCM Checklists: It looks like there used to be a checklist. I do not know what happened to the link. But
dry detention with swales isn't a typical treatment system. This is something that they would have negotiated
with the airport due to water hazard/bird impacts. There is not a checklist for dry detention.
3. Filter Strip: Again, since this is an unusual design we would have to refer to the agreement or the dry pcnd
chapter of the stormwater manual for design guidance.
4. Supplement & O&M Forms: We wound have to go through the file and the agreement and see what the best
path is. (The Supplement EZ is intended tc match up with the 2017 rules. I dcr.'t know how that aligns with
whatever is required by the agreement in order to guide you on which form malties sense.) I would recommend
to submit what you have and the review engineer will have to figure that out.
5. Submlta! List: If your list matches the list on the application then you should be fine.
6. Basin Map: if you have access to the CAD file to update the basin map that would be io4eal. If not, then ave can
:update just your phase. But, you will have to be expiicit in explaining hew your protect Nr--sup with the current
basin map (especially if you do not replace Phase 3 in full.)
7. Wetlands: Please contact Holley Snider with DWR for wetland questions. You Gviii have t!:) shGw them on the
pd
an and you will have to get approval to impact them.
8. Review Fee: That is a cuestion for Christine if the project is eligible for Express.
Thanks;
Kelly

,%_.6L ohvu&ov6
Kelly Johnson
Environmental Engineer
NC Division of Energy, Mineral and Land Resources
Stormwater Permitting
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Phone: [phone]
Note Change in Phone Number
D E
:. -
ue�t�r�en; a,�+�+ariwi aaati�y
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties
From: Stephen Ballentine [mailto:[e-mail]]
Sent: Thursday, August 27, 2020 10:57 AM
To: Johnson, Kelly <[e-mail]>
Subject: [External] .054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Express Review Application
Questions
emar"t as an attachrnenr to
Kelly,
Sorry for this long-winded email. We are preparing to make a request for an Express Review. In order to avoid issues
during the Express Review, please reply to answer the below questions.
Background:
This project will include 4 new SCMs: two pre-treatment swales in series with two extended dry detention basins. All
SCMs will be located on land, which is owned by New Hanover County, and leased by New Hanover County Airport
Authority. These SCMs will not be owned nor operated by Circle K. The applicant will be New Hanover County Airport
Authority. These are "regional" stormwater SCMs for the overall New Hanover County Airport Authority
development. There will be no subdivision of land with this project, which is a part of the airport. The airport has a very
large tract of land, which it leases from the County, with dozens of sub -lessees, such as Circle K, and none of them are
subdivided lots.
SW8 050547 was approved by NCDEQ and included a Phase 3 expansion of the airport's existing regional extended dry
detention basin to the east. However, the basin expansion has not been built to date. Our project proposes to
construct 2 new pre-treatment swales in series with 2 new extended dry detention basins, which will provide regional

stormwater management for a portion of the previously permitted Phase 3 drainage area of the airport's leased
property. This will be a modification of SW8 050547.
Please respond to the following questions:
• Attached is our single application for a Stormwater Management Permit Application for all 4 proposed
SCMs. This will be a modification to SW8 050547. Please reply to confirm that we are using the correct
application form, and that only one application is needed for all 4 SCMs.
• Section VI of the attached application states that we must include BMP checklists, but the weblink on the form is
not valid. Can you please email me the required checklists for an extended dry detention basin and pre-
treatment swale?
• This project drains to C;Sw waters (Smith Creek) in the Cape Fear Basin. Are we required to provide a filter strip
at the outlet of our dry ponds? If yes, then what length?
• Is it okay if we submit the attached Stormwater Supplement spreadsheet? Or are we required to submit the
"Supplement EZ" document on this website:
httys://deg.nc.gov/about/divisions/energy-mineral-and-land-resources/stormwater/stormwater-program/post-
construction
• Is it okay if we submit the attached 0&M agreement document? Or are we required to submit the "O&M EZ"
document on this website:
https://deg. nc.gov/about/divisions/energy-m i ne ra I -and -la nd-resources/stormwater/stormwater-program/post-
construction
• Our package will include the following items. Please let me know if I am missing anything:
o (1) original + (1) copy of Stormwater Management Permit Application.
o (1) original + (1) copy of signed & notarized Deed Restrictions & Covenants.
o (1) original of each SCM supplement form signed/dealed.
o (1) signed O&M agreement for each SCM.
o (1) check for Express Review (please confirm category and amount).
o (1) Express Review Request Form.
o (1) Detailed Narrative.
o (1) USGS Map.
o (1) Stormwater Impact Analysis including calculations.
o (2) sets of full sized plans folded to 8.5"x14"
o (1) SHWT report
o (1) Deed
o (1) document indicating that New Hanover County Airport Authority and Circle K are registered with the
Secretary of State, including the names and titles of signers.
See attached Overall Basin Map, which was part of a 2016 modification to SW8 050547.
o Will we be required to include a similar overall basin map with tables in the upper left corner for Phases
1,2,and 3?
o Or can we just provide a map showing our Phase 3 area?
o Do we also need to tabulate the "Original Permit Conditions" table on our map, as shown on the
attached?
• Note that there are some existing wetlands on the airport's property, which will be impacted with some of the
proposed infrastructure construction. Will this prevent us from obtaining stormwater approval? What do we
need to do in regards to wetland impacts prior to Express Review (if anything).

• Per the below fee chart... Is this a "Major Modification" with $4,000 Express Review Fee? Or a "Minor
Modification" with $1,500 Express Review Fee? Do we just need one single check?
IR 6ae _�.�► 9M .
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Thank for your input.
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen.ballentine(o-_)timmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here
+
v*1.LCsL Lori Dtr.
4

From: Johnson, Kelly <kelly.p.iohnsonP- ncdenr.eov>
Sent: Tuesday, March 10, 2020 11:45 AM
To: Stephen Ballentine <[e-mail]>
Subject: FW: [External] RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Existing Extended Dry
Detention Basin constructed in 12-ft deep cut
Hi Stephen,
I have attached the emais you sent this morning to the thread from last week to keep them ali together. Here are the
answers to your questions:
The SW8 050547 permit is issued to the New Hanover COUnty Airport Authority. if I remember correctly your project
wN be for a gas station (which I assume is a different owner?)
i:a, ries? prc,,00sed SLMs will be regional SC'Mls own-ed and a b t^:' .i�. '; n a' t t .��•
regional _ t;i o;arrr3t;.d ,�� � :L..v i-ler�v+�,.r ..c.;r�y Aii wa t
.,vrthor• tv. he New Fianover Count`.1 .sirpor', Aut' orit- veil! 'Ue the appi?;:art. Circla K is Iot interred tc be dhe app i,_an:
of, these regiona! SO/Is for rea sci1 : described. if _ills will be a-rclalem, their oieasa? I_t m- know. None Or' h— 0-he;'
orso ex;3riilg i-Listar er!,Ide-- elicomer, S on `."re 3 i7pjz;res ov"I- al": de' elopi":lt ^t it3` r3��" t0 �e rl :'i;iC�t?r'; ii � Ei?
past, because their •rreiect's 'created .;y t;a 3:ri arts reaicn3! SCIINI. Oui' i J 'ct i5 into: ded to bE the 53n-'; Way.
-
p J- _
Ste P, h en
If your project is inside the project area permitted under SW8 050547, then the airport can apply to subdivide their
permit to create an offsite lot for the gas station and deed restrict it to a specific amount of impervious.
Tile airPort s policy is to not _ iub&vide their crcpertty,-,nhic,, is owrted. by New Hanever County. They sub-4? se prof, rty
to dozens of custcmers, such as Circle K. Yes. ^ur project is within the area permitted Ur;der Phase 3 of SWS 050547. SF.
are : lany other e:xistirg sub -leased developments, similar to Circle K. Nooe of those prciQcts have-ubdivido ., io*s. -
Stephe
Then the gas station can apply for an offsite permit to drain to SW8 050547.
T c- 'dew -Ha ncver County .'airport Authority is intended to be the aopiic3nt, si:- ce i:hey will be iwr-I ab a� td c pe r iti:,IS tha
SC?.Ys. and because the*,; are .,eg era; SC'Ms, w,ii.t° treat s orm-wzter `„o„r tila overall airp,:vq p!,p ra t jus% C rt.!? �+
4nd s:�'ce pie K does :lot w,,�n t(ie l2tI J 11,4-ii.'1 which tR!a �C ls are 5i+uated.-5tephe
What I do not know are the details of the treatment system for SW8 050547 (design storm, treatment system, other
limitat°fins, etc.). If anything unusual was permitted under that permit their you would have to fol!ow the terms of
whatever was previously decided.
Ti.� _ • , _
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-ir--- c Hasa +�'. i?Ir.i! .:re a 7Z.C?zan S 3!: 'I !" ' k� a t pl 1 g i � i ,,, P t c "J r rie -.
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Kelly
From: Johnson, Kelly
Sent: Thursday, March 5, 2020 4:28 PM
To: Stephen Ballentine<Stephen.BallentinePtimmons.cem>
Cc: Hall, Christine <[e-mail]},">; Brian Downs <Brian.Dos+rns^timmons.com>

Subject: RE: [External] RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Existing Extended Dry
Detention Basin constructed in 12-ft deep cut
Hi Stephen,
This is quite a lot of information to review before we get an application in-house. I have not read through it. But, if this
is in line with something already approved then just go ahead and submit the application. But, if this is a new system
that wasn't covered in the original approval then you will have to demonstrate that it will work. I do not know what the
circumstances were for approving the original system or what alternatives were (or could) be used.
Kelly
From: Stephen Ballentine [ 2i.to:[e-mail]
Sent: Thursday, March 5, 2020 11:15 AM
To: Johnson, Kelly <ke'Iy.p.iohnson@ncc"enr.gov>
Cc: Hall, Christine <[e-mail]>; Brian Downs <[e-mail]>
Subject: [External] RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Existing Extended Dry Detention
Basin constructed in 12-ft deep cut
'Do not --- -open - attachment to 9R
Good morning Kelly,
Attached is one more piece of background information for you. This is a record drawing/plan of the existing Phase 1 & 2
Extended Dry Detention Basin, located to the southeast of our Circle K site, which provides stormwater management for
the majority of the Wilmington International Airport's built -upon area.
Notice how the north end of this basin was constructed in an area with as deed as 12-feet of cut (presumably below the
SHWT). What we are requesting with our Phase 3 basin is consistent with what NCDEQ previously approved within
Phases 1 & 2. The airport's property is large and flat, and NCDEQ was flexible with the airport's design approach with
this existing basin.
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com [nam03.safelinks.t)rotection.outlgok.comj
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen. ballentine(c),ti mmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click hereInam03.safelinks.prctectio-ri.outlook.comI

From: Stephen Ballentine
Sent: Thursday, March 5, 2020 11:02 AM
To: Johnson, Kelly <[e-mail]>
Cc: Hall, Christine <[e-mail]>; Brian Downs <[e-mail]>
Subject: RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Pre -Treatment Swales Design Criteria
Kelly,
Please refer to the attached items:
Previously approved Pretreatment Grass Swales Sheet C3.0.
o This plan shows that two 150-LF grass swales were constructed in areas of 10-ft deep excavation
(presumably below the SHWT) for the Phase 1 and Phase 2 drainage areas.
o Question: Our proposed Phase 3 with Circle K intends to provide similar grass pre-treatment swales
(150 LF and below SHWT) as the existing Phase 1&2 swales described above. Please reply to let us know
if this approach will be acceptable in order to meet NCDEQ's requirements for the grass pre-treatment
swales for Phase 3.
• Total Proposed Grass Swale Length = 150'
• Proposed Grass Swales constructed in areas of excavation (likely below SHWT).
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com [nam03.safelinks. protection. outlook. corn]
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen. ballentine(dtimmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here [nam03.safelinks.protection.outlook.comI
From: Stephen Ballentine
Sent: Thursday, March 5, 202010:44 AM
To: Johnson, Kelly <keiiy.p.iohnson([e-mail]>
Cc: Hall, Christine <[e-mail]>; Brian Downs <[e-mail]>
Subject:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater
Kelly,
See attached previously approved stormwater permitting items for your reference:
• SW8 050547 approved modification including Phase 3 drainage area.
o Phases 1, 2, & 3 drainage areas of the airport property are approved for high density. Refer to the tables
on page 8 of the attached permit for the BUA area allowances for each phase.
• Approved Phase 3 Extended Dry Detention Basin Modification Plan
• DA Map showing Phase 3 drainage area and our proposed Circle K site.

Our Circle K project is located within the "Phase 3" drainage area of the airport. See attached SW8 050547 modification,
which NCDEQ approved in 2011. See attached Phase 3 modification of the existing extended dry detention basin, which
was approved, but the Phase 3 expansion of the existing basin to the east of our site was not built.
Our project would be submitting a modification to SW8 050547, which would include the construction of a new Phase 3
extended dry detention basin and pre-treatment grass swales located in the southwest corner of the Phase 3 drainage
area. Due to the existing flat topography, the extended dry detention basin and the grass swales would need to be in
areas of cut, and could be below the SHWT. (This is similar to SCMs, which NCDEQ previously approved in Phases 1 & 2
with the existing grass swales and existing dry basin to the east.)
NCDEQ approved the Airport's Stormwater Master Plan with alternative measures to allow the airport flexibility to
achieve their goals. The airport's existing dry basin was constructed in a deep cut, which likely encroached into the
SHWT in areas. We are asking NCDEQto show us the same flexibility with our SCM design, and to allow the same type
of alternative measures, which NCDEQ previously approved with Phases 1 & 2, including grass swales and extended dry
detention basins in deep cuts, which may be below the SHWT.
We would like to have you onboard with the above issues before we proceed with our full design & submittal. I am
available via email or phone.
Thanks for your assistance.
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com fnam03.safelinks.Protection, outlook. coml
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen. ballentineCcr�.timmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here[nam03.safelinE,s.protection.outloo!t.comI
From: Johnson, Kelly <[e-mail]>
Sent: Thursday, March 5, 2020 8:59 AM
To: Stephen Ballentine<[e-mail]>
Cc: Hall, Christine <Christine.Hall @ncdenr.gov>; Brian Downs <[e-mail]>
Subject: FW: [External] Dry Pond Below SHWT with clay liner
Stephen,
I issue stormwater permits in the regular program. I am not familiar with this: document. I didn't read it in detail, but a
quick skim looks like it was developed to let the airport develop as low density to 30% with pockets of high density. It
establishes 13 sub -basins and discusses some specific dry detention systems. Would this be to implement something
that has already been approved? Or would this modify something that wGs previously approved? Or wouid it be
something completely new? If you are adding impervious will the project remain at/below 30;? Is this inside the
original project area of the permit?
As for the clay liner question, I have been told by soil scientists over the years that liners do a better joa of keeping
water inside a pond than they do keeping water out of a pond. I have been told that the bentonite cracks under the

hydraulic pressure of trying to keep water from seeping into a lined system. But, I am not an expert in this
department. I think you would have to demons rate that the liner would function indefinitely in the proposed capacity.
Also, again, I do not know anything about this permit. (Are we talking about SW8 040836?) We would have to see how
that permit is written, what area it covers, etc. As Christine has pointed out, this wouid be a deviation under the current
stormwater rules.
Kelly
From: Hall, Christine
Sent: Thursday, March 5, 2020 8:24 AM
To: Johnson, Kelly <[e-mail]>
Subject: FW: [External] Dry Pond Below SHWT with clay liner
From: Stephen Ballentine[mailto:[e-mail]
Sent: Wednesday, March 4, 2020 5:30 PM
To: Hall, Christine <[e-mail]>
Cc: Brian Downs <Brian.Downs Cftmmons.com>
Subject: RE: [External] Dry Pond Below SHWT with clay liner
al email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Christine,
Thanks for your message. Please provide me with a name, email, and phone number of someone in the regular
stormwater program, who I should discuss this with.
The Wilmington International Airport's Stormwater Masterplan was approved back in 2004 with alternative stormwater
measures.
• Per pages 17 and 18, the following SCMs will be proposed:
• Grass pre-treatment swales in series with Extended Dry Detention Basin.
This is consistent with the existing stormwater SCM's constructed to serve the overall airport property.
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com[ram03.safelirts.arr,eati-on.outloon.corn?
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
s:aphen. ballentine-5&timmons.com
Your Vision Achieved Through Ours
Ta send me files greater than 20NTS click here f*tar:z03.safelinics.crotection.:jui;Icok.ccmI
9

From: Hall, Christine <[e-mail]>
Sent: Wednesday, March 4, 2020 5:06 PM
To: Stephen Ballentine<[e-mail]>
Subject: RE: [External] Dry Pond Below SHWT with clay liner
Stephen,
I'm not aware that a dry detention basin is considered to be a primary SCM per 15A NCAC 02H.1002(37). How is the
project intending to demonstrate compliance with the stormwater rules?
I cannot comment on the acceptability of a clay liner until the full design is presented as part of a submittal
package. However, the dry detention basin section of the design manual does net appear to support setting dry
detention basins any lower than 6" above the SHWT.
15A NCAC 02H.1003(6) addresses projects that propose any variations from the rules or established minimum design
criteria. Please note that projects proposing alternative designs must be submitted to the regular program. The fast
track and express programs are net set up for these types of projects.
Christine
C_il'aif C iit?SpGnCis:'-e toir" f ; ?7 "': i c '!re;3s is SLla G : s� t:'t?
�i;o?.f' vA'_;.'"?JOU rtci: ro. A —Y. `c; .:i2✓.,8JtSCrUSeC;
From: Stephen Ballentine[mailto:[e-mail]]
Sent: Wednesday, March 4, 2020 2:19 PM
To: Hall, Christine <[e-mail]>
Subject: [External] Dry Pond Below SHWT with clay liner
External email. Do not click finks or open attachments unless you verify. Send al# suspiciouMail as ailt to
Good afternoon Christine,
Are you okay with us using an extended dry dentention basin, which is below the SHWT, if we use a clay liner?
Thanks,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com [na m03. safelin ks. proecticn.outlook. coml
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen. ballentineCo)-timmons.com
Your Vision Achieved Through Ours
10

PIEDM NT
ENVIRONMENTAL
ASSOC I A T E S° P. A.
7/31/2020
Timmons Group
5410 Trinity Rd., Suite 102
Raleigh, NC 27607
Project # 1775
This report details the findings of a seasonally high-water table evaluation for the
Wilmington Airport site in New Hanover County, NC. Your office gave the location of
the proposed storm water control measures (SCM) and requested boring locations. G.
Christopher Murray, Licensed Soil Scientist #1284, conducted the evaluation on July
27th, 2020. The results were as follows:
Seasonally High -Water Table Soil Borings
Soil boring were completed within the proposed stormwater control measure at the
locations shown on the attached map. The depth to the seasonally high-water table
(SHWT) was determined by observing soil indicators, also known as redoximorphic
features.
Boring 1:
Signs of a seasonally high-water table were observed from 8 inches to 120 inches. The
native elevation at our boring location was approximately 22'.
Boring 2:
Signs of a seasonally high-water table were observed from 10 inches to 120 inches. The
native elevation at our boring location was approximately 23'.
Boring 3:
Signs of a seasonally high-water table were observed from 12 inches to 120 inches. The
native elevation at our boring location was approximately 23'.
Boring ID
SHWT Depth inches
SHWT Elevation feet
1 '
8-120
21.3-12
2
10-120
22.2-13
3
12-120
22-13
216 S. Swing Rd., Suite 1 Greensboro, NC 27409 336-662-5487

I,-

Piedmont Environmental Associates, PA is pleased to perform this work for you. If you
have any questions, please feel free to call [phone].
Sincerely,
G. Christopher Murray
N.C. Licensed Soil Scientist #1284

k1l

Timmons Group - Wilmington Airport Project (TG 37630.054)
PIEDMONT Job#:1775
EN V'�i RON u N TILL 216 S. Swing Rd. Suite 1 Date: 7/31120
ASSOCIATES, P. A Greensboro, NC 27409 Client: Timmons Group
I *Vpiedmontsoil.com County: New Hanover
- � - � - - � .. � ` y. - - � � .. � � � � •- mar �.
k
A ilk
_- -
OP He,
H-&&�7
s, 4 �. -1.
rF, X 4 :r = :. Legend
® Boring Locations
123�

TALBERT & BRIGHT
Jul. 2 0 2020
July 20, 2020
Mr. Garrett Zorda
NC Department of Environmental Quality
Division of Energy, Mineral and Land Resources
Wilmington Regional Office
127 Cardinal Drive Ext, Wilmington, NC 28405
RE: Wilmington International Airport
Air Carrier Apron Expansion Phase 1
Stormwater Project No. SW8 050547
TBI No. 3301-1702
Dear Mr. Zorda:
This follow up provides response to the stormwater review/comments included in the letter dated July
17, 2020. The comments are addressed below.
Comment
1. 15A NCAC 02H.1042(2)(a)(iv): In an effort to better document the complete approved design
condition and prevent future disconnect between the "Phase I & II" condition and the "Overall"
condition, please update the table in Section V.10 of the submitted application and plan sheet C1
to include a fourth column for the "Future Phase III", as represented in the provided "Overall Basin
Map" plan sheet. Please also provide an electronic copy of this table so that it can be included as
an attachment to the issued permit.
Response
Plan sheet C1 and the table inform SWU-101, Section IV.10. have been updated to include "Future
Phase Ill". An electronic copy of the updated table was sent via email on July 17, 2020 to your
email address, [e-mail]. Attached are revised plan sheet C1 and updated page
3 of form SWU-101.
Comment
2. 15A NCAC 02H.1042(2)(g)(iii): Please provide the boundaries of all surface waters, wetlands,
regulatory flood zones, protected vegetated setbacks, and protected riparian buffers, or a note
on the plans that none exist. If a note is already provided on the plans, please provide a citation
of where it can be located.
Response
The note at the bottom of plan sheet C1 has been revised to state, "No surface waters, wetlands,
regulatory flood zones, protected vegetated setbacks, or protected riparian buffers exist."
Attached is revised plan sheet C1.
ENGINEERING & PLANNING CONSULTANTS
4810 SHELLEY DRIVE WILMINGTON, NC 28405 910.763.5350 FAX [phone]

TALBERT & BRIGHT
Comment
3. 15A NCAC 02H.1050(7): Every SCM impacted by sedimentation and erosion control during the
construction phase shall be cleaned out and converted to its approved design state. Please
provide a note on the plans for this issue.
Response
A note (note 17) on plan sheet ESC3 has been added to state, "Once construction is complete and
the site is stabilized, the Contractor shall be responsible to clean out the newly constructed
treatment swale and existing basin, and convert them to their approved design state." Attached
is revised plan sheet ESC3.
If you should have any further questions, please call.
Sincerely,
tAcc.,j
Ray Marconi, PE
Enclosures: (Revised Plan Sheets C1 and ESC3, updated table on page 3 of Form SWU-101, Section IV. 10.)
C: Mr. Granseur Dick, PE, CM
ENGINEERING & PLANNING CONSULTANTS
4810 SHELLEY DRIVE WILMINGTON, NC 28405 910.763.5350 FAX [phone]

ROY COOPER.
;.;0
iivil(MAEL S. REGAN
s~ y
BRIAN WRENN
DOW1w
July 17, 2020
Via email only: gdicJi(a�,flyilm.com
New Hanover County Airport Authority
Attn: Granseur Dick, PE, Facilities Director
1740 Airport Boulevard, Suite 12
Wilmington, NC 28405
NORTH i.AROUNA
;Ei na"W QK0*
Subject: Request for Additional Information
Stormwater Project No. SW8 050547
Wilmington International Airport EDDB
New Hanover County
Dear Mr. Dick:
The Wilmington Regional Office received and accepted a modified State Stormwater Management Permit
Application for the subject project on April 21, 2020. A preliminary in-depth review of that information has
determined that the application is not complete and that additional information is needed. To continue the review,
please provide the following additional information in a single, hard cony submittal package:
15A NCAC 02H.1042(2)(a)(iv): In an effort to better document the complete approved design condition
and prevent future disconnect between the "Phase I & 11" condition and the "Overall" condition, please
update the table in Section V.10 of the submitted application and plan sheet C 1 to include a fourth column
for the "Future Phase III", as represented in the provided "Overall Basin Map" plan sheet. Please also
provide an electronic copy of this table so that it can be included as an attachment to the issued permit.
2. 15A NCAC 02H.1042(2)(g)(iii): Please provide the boundaries of all surface waters, wetlands, regulatory
flood zones, protected vegetated setbacks, and protected riparian buffers, or a note on the plans that none
exist. If a note is already provided on the plans, please provide a citation of where it can be located.
3. 15A NCAC 02H.1050(7): Every SCM impacted by sedimentation and erosion control during the
construction phase shall be cleaned out and converted to its approved design state. Please provide a note
on the plans for this issue.
Please remember to confirm that any revised information is presented consistently throughout the application
documents including calculations, supplements, narrative, and plans. Please also remember to provide two hard
copies of any updated documents per 15A NCAC 02H.1042(2).
All of the requested information listed above should be received in this Office by August 3, 2020, or the
application will be returned as incomplete. If additional time is needed to submit the requested information,
please email your extension requestyrior to this due date to the email address provided below with a justification
and a date of when the requested information will be submitted, which shall be no later than 15 days past the
original due date. Please note that only two letters requesting additional information is allowed in the State
Stormwater Program for a total of 30 days to submit the requested additional information. If the information is
not satisfactorily provided after either the second request or 30 days, the project will be returned. If the project is
returned and you wish to re -submit later, you will need to resubmit all required items at that time, including the
application fee.
The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation
Erosion Control Plan, is a violation ofNCGS 143-215.1 and is subject to enforcement action pursuant to NCGS
143-215.6A.
NtM'L}l Ca"+.d''o� _"art111fRt at F_-"OY11S1L'f31J( amft'Fi DmBiafl :.)f;r'71Ci* ~oi:xl�K�f and Resewri,
$ 4VYlmingtcfn i i,�t`�:r Q. iardlrk)t "Drive Eversion Wlhnaryyr�+� .ticortn�a roiaw �IS�U"+
>�� ��➢G!Almai Yua4� a�1'� '�'l�M.q=.'I.f..

State Stormwater Permit No. SW8 050547
Page 2 of 2
Please reference the State assigned project number on all correspondence. If you have any questions concerning
this matter, please feel free to call me at [phone] or email me at [e-mail].
Sincerely,
V4ne& 5nd4
Garrett Zorda
Environmental Engineer
DES/gdz: 111Stormwater\Permits & Projects120051050547 HD12020 07 addinfo 050547
cc: Ramon Marconi, PE, Talbert & Bright, Inc.; via email: [e-mail]
Wilmington Regional Office Stormwater File

Zorda, Garrett D
From:
Zorda, Garrett D
Sent:
Friday, July 17, 2020 11:50 AM
To:
[e-mail]; Ray Marconi
Subject:
Wilmington International Airport (SW8 050547) - Request for Additional Information
Attachments:
2020 07 addinfo 050547.pdf
All,
Attached is a pdf of the request for additional information for the subject project. There are just a few items that need
to be addressed. Please let me know if you have any questions or concerns.
Thanks,
Garrett Zorda
Environmental Engineer
Division of Energy, Mineral and Land Resources — State Stormwater Program
Department of Environmental Quality
910 796 7215 office
910 796 7343 direct "Please note the change to my direct phone number""
garrett.zorda4mcdenr. ov
127 Cardinal Drive Ext.
Wilmington, NC 28405
01MINIMW oft �'Ilw

Zorda, Garrett D
From: Zorda, Garrett D
Sent: Wednesday, July 8, 2020 11:20 AM
To: Christine Hall ([e-mail])
Subject: Airport "overland stormwater flow" - G.S. 143-214.7(c4)
Good Morning Christine,
I am reviewing the modification for ILM Airport (SW8 050547) and just want to get some clarification so I can better
understand if what they are proposing meets the rules or not. This modification proposed two areas of the air carrier
apron where the aircraft maneuver and park. The first, larger expansion, is being collected (along with some of the
existing apron) and directed to a new proposed treatment swale that leads to a dry basin. The second area (which is on
the other side of the apron from the first area) proposes to add 9,268 sf of BUA, but they are claiming that "As
previously discussed, this area has "overland stormwater flow" that meets the N.C.G.S 143-214.7(c4) criteria and no
further treatment is necessary." The "As previously discussed" refers to a scoping meeting Linda had with them on May
21, 2019. 1 tried to find notes or something from that meeting in the file, but did not find anything.
The proposed second area in question does drain to a grassed area for roughly 180' before it goes into an existing drop
inlet. I believe this drop inlet currently directs runoff under the taxiway and runway to further grassed areas, although I
am still trying to confirm that on older plans. If that can be confirmed, and it isn't directed to an existing system, it
appears that they would meet that statute, but I do not have any experience with approving this statute, so I was hoping
to get a little more insight on this statute, its applicability, etc. before proceeding. I checked the clarification documents
and did not find any relevant information. I am pretty deep in the weeds with this project and just want to make sure I
am not heading down a rabbit hole.
Any information you can share would be much appreciated.
Thanks,
Garrett Zorda
Environmental Engineer
Division of Energy, Mineral and Land Resources State Stormwater Program
Department of Environmental Quality
910 796 7215 office
910 796 7343 direct *"Please note the change to my direct phone number"*
garrett.zordaftncdenr.aov
127 Cardinal Drive Ext.
Wilmington, NC 28405
E.rri3i% i:{,'... '' s1r;G`N; �Wt== cC' of7C1 7 !?? tili,y fs iubject to the
!'JOrth f�afi7S`1f7: bfic ��e.'�=•f'r iaL' i�litl may beC7ltiGl[i,S if third i r/ !v'S.

Burd, Tina J
From: Burd, Tina J
Sent: Friday, April 24, 2020 10:18 AM
To: [e-mail]; [e-mail]
Subject: SW8 050547 - Air Carrier Apron Expansion Phase I at Wilmington International Airport
The Wilmington Regional Office of the Division of Energy, Mineral and Land Resources (Stormwater Section)
accepted the Stormwater Permit Application and $505.00 fee for the subject project on April 21, 2020. The
project has been assigned to Garrett Zorda and you will be notified if additional information is needed. Please
be advised that the construction of built -upon area may not commence until the Stormwater Permit is issued.
Best Regards,
Tina Burd
Administrative Associate II
Wilmington Regional Office
Division of Environmental Assistance & Customer Service
Phone [phone]
NCDEQ
Wilmington Regional Office
127 CardinaR Drive Ext.
Wilmington, NC 28405

Application Completeness Review Checklist (Non -Transfers) - Short Version
Project Name: W a , Ale-r _ Date Dei:vered to WIRO: r zi c
Project County/'Location: mc-,J Aq ooy E d,�� M _ SIMS Receiven!Accep,ed Date.
Fiuie(s): ❑?_017 Coasts' ❑2D08 Coastal ®1995 Coastai SIMS Acknowledged Date::
Phase II Universal F-11988 Coastal
Permit Action: New
Major Mod Minor Mod Renewal
Permit Type HD LD j l_D Overa+l / !D &LD Come;o
New Permit #2:
Existing Permit #:: 7
Expriation Date: lr, 15 Z7
General Permit / Offsne / Exempt / Rescission DOffsite to 5W8:
Development Type: Commercial / Residential / Other IndElnt is in Maste' PerrnitP
Subdivided;: Subdivision or Single Lot r•}Yi4 EIPE Cert on File?
Peermrttee Type & Documents Needed:
jPropertu Owner(s) M Purchaser
El Lessee
`viable?
D iab+e?
Viable?
Deed
0 Purchase Agmt
Lease
Not Subdivided:
'Deed
Flu`id.vision Cornrnon
Area Deed
Paperwork
Application
1:1110-4 FiDeveloper
❑!'iaaie? Fiviaaie?
Election Minutes
[$50S (within 6mo) Check#(s): [ - (, J 7
supplement (I new form or for older forms: 1 original per SCM)
InSoiIs Report (lnfil or PP)
k2jCairulations (signed/sealed)
Deed Restrictions, if subdivided
®Project Narrative
USGS Map (or on fily) Subject to SA?: Y CN Subject to ORW?-
Plans (2 Sets)
FIPE Certification
Electronic Copies
Easements, Recorded l2017 Rules)
NOTES:
'Enter B I M 5 Acknowledged Date on this Sheet
2For New Projects -Enter New Permit # on Supplements & Deed Restiction Templates.
3If w/in 6 months and they are requesting a rnod, STOP. Needs a renewal first.
EMAILED ENGINEER DATE: Comments:
REVIEWER NAME: C7 or 1>.�
WG.•,,,Rererence-ibrary\Pr• cecures\C`+ecklist5l0omple?eness Review Checklist 2020 02 31
DNo Fee
Y/C�

TALBERT & BRIGHT, INC.
ENGINEERING & PLANNING CONSULTANTS
LETTER OF TRANSMITTAL
To: NC Division of Environmental Quality
Land Resources
127 Cardinal Drive Ext, Wilmington, NC 28405
Date: 4/21/20 Pro'. No. 3301-1702
Attention: Garrett Zorda
Re: Wilmington International Airport
Air Carrier Apron Expansion Phase 1
Stormwater Permit Modification —
Permit No. SW8 050547
WE ARE SENDING YOU:
®
Attached
❑
Under Separate Cover via
❑ Shop Drawings
❑
Prints
®
Plans
❑ Copy of Letter
❑
Change Order
❑
Other
the following items:
❑ Specifications
ITEM
DATE
NO.
DESCRIPTION
2
Stormwater Management Permit Application - SW8 050547 1 Original & 1 co
2
Operation & Maintenance Agreement 2 Originals) ., r�
2
Supplement EZ form 2 Originals)
2
Narrative with Impervious and Swale Calculations R 2 1 2020
0
2
Phase I Drainage Area Revised Boundary _
2
Full Size Plan Sheets Al, A2, A4, A5, C1, SC1, EX1, EX2, EX3, G1, G2, G3, G5,
ESC1, ESC2, ESC3, ESC4, D1, D3, D4, D5, P1, X3
1
$505 Check for Permit Fee Check No.: 66773
THESE ARE TRANSMITTED, as checked below:
®
For Approval
❑
❑
For your Use
❑
❑
For Review and Comment
❑
❑
As Requested
❑
❑
FOR BIDS DUE ON
REMARKS
No Exception taken
Make Corrections Noted
Amend and Resubmit
Rejected — See Remarks
❑ Resubmit Copies for Approval
❑ Submit Copies for Distribution
❑ Return Corrected Prints
❑ Prints Returned After Loan to Us
❑ Other
.fir........._. _
COPY TO Granseur Dick, PE (half size plan sheets) SIGNED Ray Marconi, PE
ENGINEERING & PLANNING CONSULTANTS
4810 Shelley Drive Wilmington, NC 28405 910.763.5350 FAX [phone]

Jvtz
APR 71 2020
BY•
Stormwater Narrative
Wilmington international Airport
Wilmington, North Carolina
Air Carrier Apron Expansion
Phase I
December 5, 2019
G A Roo 6,.,
SEA►-
.
034503
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The project involves the expansion of the Air Carrier Apron at Wilmington International
Airport (ILM). The primary expansion (Area 1 & 1A) is on the southwest side of the existing
apron. This expansion is intended to provide aircraft maneuvering and parking space
associated with the expanded hold room and new boarding gates. The secondary area (Add
Alternate - Area 2) is a small apron expansion at the southeast corner of the existing apron,
intended to ease aircraft maneuvering constraints at existing boarding gates. This project
with the proposed stormwater treatment concepts was discussed during a scoping meeting
with Linda Lewis on May 21, 2019.
The Air Carrier Apron Expansion project will involve a net increase of impervious surfacing on
the airfield. Currently, the site drains toward to Smith Creek without treatment. The project
drainage design is to include new storm drainage inlets and pipes, conveying the runoff to a
new pre-treatment swale, then to the existing forebay area of the airport's Extended Dry
Detention Basin No. 1 facility (Permit No. SW8 050547). The basin has been previously sized
and permitted for future allocations. This development will utilize 224,192 sf of that future
BUA allocation.
Prior to directing the runoff to the existing Extended Dry Detention Basin, the runoff must be
treated through an additional SCM to achieve the required pollutant removal. A new pre-
treatment swale (Pre -Treatment Swale #3) has been designed to accommodate this project
and future development. The overall design capacity for the new swale is 696,690 sf (16.0
ac) with 522,720 sf (12.0 ac) of Built Upon Area. This development will utilize 224,192 sf of
the 522,720 sf BUA allocation. 113,433 sf of the 224,192 sf is existing BUA that is currently
not being treated.
Based on the approved permit SW8 050547, a portion of this project's proposed drainage
area is outside the 'overall basin map'. The overall basin drainage map has been revised to
include the portion of the project currently not included and remove other areas to offset the
=� difference. The overall drainage area and impervious totals from permit SW8 050547 will
remain the same.
z.
The secondary area (Add Alternate - Area 2) at the southeast corner of the existing apron has
net increase of 9,268 sf. As previously discussed, this area has "overland stormwater flow'
at meets the N.C.G.S. 143-214.7(c4) criteria and no further treatment is necessary.
A revised Overall Basin Map and Swale Calculations (0.75 in/hr, 10-yr, & 100-yr) are attached.

Wilmington International Airport
Air Carrier Apron Expansion Phase I
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Wilmington International Airport Area 2
Air Carrier Apron Expansion Phase I
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TBI No.: 3301-1702
Wilmington International Airport
Air Carrier Apron Expansion Phase 1 December 5, 2019
Areas and Weighted C
Pre
Built Upon
Area in
Drainage
Drainage Drainage
Percent of
Weighted
Inlet ID
Area ID
Area Area
BUA
C
See Note E1
Pre 1
218,538 sf 30,944 sf
14.16%
0.26
See Note E7
Pre 2
50,936 sf 30,259 sf
59.41%
0.63
See Note E4
Pre 3
51,723 sf 51,723 sf
100.00%
0.95
See Note NA
Pre 4
321,335 sf 11,842 sf
3.69%
0.18
Overall Total
642,532 sf 124,768 sf
19.42%
0.31
Note: Existing Drainage Area currently
does not outfall to existing
Basin
C Number
Sandy Soils
Percent of Drainage Area
100%
Rooftops and pavement
0.95
Lawns, sandy soil, average (2-7%)
0.15
J:\3301 (Wilmington)\1702 Air Carrier Apron Expansion -Phase I\Permits\NCDEQSW\
Areas.xlsx
areas 19 1205 SW

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TBI No.: 3301-1702
Wilmington International Airport
Air Carrier Apron Expansion Phase 1 December 5, 2019
Areas and Weighted C
Post (Proposed Project)
Built Upon
Area in
Drainage
Drainage
Drainage
Percent of
Weighted
Inlet ID
Area ID
Area
Area
BUA
C
See Note E1
Post 1
97,317 sf
5,763 sf
5.92%
0.20
See Note E7
Post 2
8,849 sf
1,868 sf
21.11%
0.32
DI P2
Post 8
133,531 sf
3,070 sf
2.30%
0.17
DI E3
Post 5
125,591 sf
125,591 sf
100.00%
0.95
DI E4
Post 3
51,723 sf
51,723 sf
100.00%
0.95
DI P3
Post 7
18,471 sf
2,755 sf
14.92%
0.27
DI E5
Post 6
37,434 sf
37,434 sf
100.00%
0.95
NA
Post 4
153,993 sf
3,619 sf
2.35%
0.17
Overall Total
626,909 sf
231,823 sf
36.98%
0.45
Total to
Swale & Basin
520,743 sf
224,192 sf
43.05%
0.49
Note: Drainage Area Outfall remains unchanged; Not included in Swale &
Basin
C Number
Sandy Soils
Percent of Drainage Area
100%
Rooftops and pavement
0.95
Lawns, sandy soil, average (2-7%)
0.15
J:\3301 (Wilmington)\1702 Air Carrier Apron Expansion - Phase I\Permits\NCDEQ Sw\
Areas.xlsx
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Wilmington International Airport
Air Carrier Apron Expansion Phase 1
Areas and Weighted C
Max DA for Proposed PreTreatment Swale #3
TBI No.: 3301-1702
December 5, 2019
Maximum Drainage
Maximum Built Upon
Percent of
Weighted
Area
Area
BUA
C
Maximum Area to Swale 696,960 sf (16.00 ac)
522,720 sf (12.00 ac)
75.00%
0.75
C Number Sandy Soils
Percent of Drainage Area 100%
Rooftops and pavement 0.95
Lawns, sandy soil, average (2-7%) 0.15
J:\3301 (Wilmington)\1702 Air Carrier Apron Expansion -Phase I\Permits\NCDEQ SW\
Areas.xlsx
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TBI No.: 3301-1702
Wilmington International Airport
Air Carrier Apron Expansion Phase 1
Swale Calculations
Max Drainage Area to Proposed PreTreatment Swale #3
Swale dimensions and drainage information
Max Drainage Area= 16.00 ac
C= 0.75
Base width(b)= 6.0 ft Z = 5.0 d = depth 7.8 ft
high= 17.00 ft low= 15.20 ft length= 225 ft
Slope(S) = 0.0080
IDEQ 0.75 in/hr
Design QDEQ = 9.00 cfs
Bermuda Grass d
Capacity of Swale 7.80 ft
Flow Conditions .47 ft
Freeboard 7.33 ft
December 5, 2019
A=bd+(zd)^2
P=b+2dx((z)"2+1)^.5
A P R n V Qact Comments
351.00 sf 85.54 ft 4.10 ft 0.030 11.39 fps 3,998.20 cfs Qact>QDEQ OK V<5 fps X
3.96 sf 10.83 ft .37 ft 0.030 2.27 fps 9.00 cfs Qact>QDEQ OK V<5 fps OK
110 7.23 in/hr
Design Q10 = 86.76 cfs
Bermuda Grass d A P R n V Qa, Comments
Capacity of Swale 7.80 ft 351.00 sf 85.54 ft 4.10 ft 0.030 11.39 fps 3,998.20 cfs Qact>Q10 OK V<5 fps X
Flow Conditions 1.50 ft 20.21 sf 21.28 ft .95 ft 0.030 4.29 fps 86.76 cfs Qat>Q10 OK V<5 fps OK
Freeboard 6.30 ft
1100 9.60 in/hr
Design Q100 = 115.20 cfs
Bermuda Grass d
Capacity of Swale 7.80 ft
Flow Conditions 1.71 ft
Freeboard 6.09 ft
A
P
R
n V
Qa«
Comments
351.00 sf
85.54 ft
4.10 ft
0.030 11.39 fps
3,998.20 cfs
Qact>Q1oo OK V<5 fps X
24.91 sf
23.45 ft
1.06 ft
0.030 4.62 fps
115.20 cfs
Qact>Q1oo OK V<5 fps OK
J:\3301 (Wilmington)\1702 Air Carrier Apron Expansion - Phase I\PermitsW CDEQ SW\
Swales DEQ SW.xlsx
Swale SW Max 1205 19

TBI No.: 3301-1702
Wilmington International Airport
Air Carrier Apron Expansion Phase 1
Swale Calculations
Current project Drainage Area to Proposed PreTreatment Swale #3
Swale dimensions and drainage information
Max Drainage Area= 11.95 ac
C= 0.49
Base width(b)= 6.0 ft Z = 5.0 d = depth 7.8 ft
high= 17.00 ft low= 15.20 ft length= 225 ft
Slope(S) = 0.0080
IDEA 0.75 in/hr
Design QDEQ = 4.39 cfs
Bermuda Grass d
Capacity of Swale 7.80 ft
Flow Conditions .32 ft
Freeboard 7.48 ft
December 5, 2019
A=bd+(zd)^2
P=b+2dx((z)^2+1)^.5
A P R n V Qad Comments
35 1. 00 sf 85.54 ft 4.10 ft 0.030 11.39 fps 3,998.20 cfs Qad>QDEQ OK V<5 fps X
2.42 sf 9.25 ft .26 ft 0.030 1.82 fps 4.39 cfs Qad>QDEQ OK V<5 fps OK
110 7.23 in/hr
Design Qlo = 42.35 cfs
Bermuda Grass d A P R n V Qact Comments
Capacity of Swale 7.80 ft 351.00 sf 85.54 ft 4.10 ft 0.030 11.39 fps 3,998.20 cfs Qad>Qlo OK V<5 fps X
Flow Conditions 1.06 ft 11.96 sf 16.80 ft .71 ft 0.030 3.54 fps 42.35 cfs Qad>Qlo OK V<5 fps OK
Freeboard 6.74 ft
I100 9.60 in/hr
Design Q100 = 56.23 cfs
Bermuda Grass d
Capacity of Swale 7.80 ft
Flow Conditions 1.22 ft
Freeboard 6.58 ft
A
P
R
n
V Qad
Comments
351.00 sf
85.54 ft
4.10 ft
0.030
11.39 fps 3,998.20 cfs
Qact>Q1oo OK V<5 fps X
14.71 sf
18.41 ft
.80 ft
0.030
3.82 fps 56.23 cfs
Qact>Qloo OK V<5 fps OK
J:\3301 (Wilmington)\1702 Air Carrier Apron Expansion - Phase I\Permits\NCDEQ SW\
Swales DEQ SW.xlsx
Swale SW Ph 1 1205 19

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DECEMBER 2019
Sd. V— 500'
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Project No.
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SCALE IN FEET
1"= 500'

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
BRIAN WRENN
Acting Director
March 31, 2020
NORTH CAROLINA
Enytrww entulQuality
New Hanover County Airport Authority
Attn: Granseur Dick, Facilities Director
1740 Airport Boulevard, Suite 12
Wilmington, NC 28405
Subject: PROJECT RETURN
Stormwater Management Project No. SW8 050547
Wilmington International Airport EDDB
New Hanover County
Dear Mr. Dick:
The Wilmington Regional Office received and accepted a State Stormwater Management Minor
Modification Permit Application for the subject project on January 29, 2020. A review of the information
submitted with the application indicates that the requested minor modification is increasing the size of the
SCM. Any increase In the size of the SCM is considered a major modification to the permit per 15A
NCAC 02H.1002(23) and (25).
Per the requirements of Title 15A NCAC 02H.1042(3)(a)(ii) of the Stormwater Management Rules, this
Office is hereby returning the subject application as incomplete.
If you wish to pursue construction of this proposed project, you must reapply to the Division. Your
application package must include a completed and signed application form; supplement form; signed
O&M agreement; application fee; signed, sealed and dated calculations; and 2 sets of signed, sealed and
dated site layout and grading plans with details.
Please note that the permit issued on October 3, 2019 remains in full force and effect. Please be aware
that the construction of any changes to the originally approved and permitted plans prior to the receipt of
a modified permit is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to
NCGS 143-215.6A.
If you have any questions concerning this matter, please contact Garrett Zorda at [phone] or via e-
mail at [e-mail].
Sincerely,
Brian Wrenn, cting Director
Division of Energy, Mineral and Land Resources
DES/gdz: \\\Stormwater\Permits & Projects\2005\050547 HD\2020 03 return_project 050547
cc: Ramon Marconi, PE, Talbert & Bright, Inc.
New Hanover County Building Safety Department.
Wilmington Regional Office
I North Carolina Department of Environmental Quality I Division of Energy. Nflneral and Land Resources
Q. E I
Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington. North Carolina 28405
NQUaLgaaam
°p1b�g°°' \ 401�4 910.796.7215

Zorda, Garrett D
From: Zorda, Garrett D
Sent: Thursday, March 26, 2020 1:24 PM
To: Ray Marconi; [e-mail]
Cc: Sams, Dan
Subject: RE: [External] FW: SW8 050547 - Wilmington International Airport EDDB
All,
I am currently reviewing the subject project, which was submitted as a lhftor Modification. Per 15A NCAC 02H.1002(25),
a minor modification is defined as "a change of a state stormwater pel mit that does not increase the net built -upon area
within the project or does not increase the ove -all size of the stormwater control measures that have been approved for
the project." The submitted application package, however, indicates that a new SCM (Pre -Treatment Swale #3) is being
proposed to meet Permit Condition 1.9. Adding this SCM would require this modification to be submitted as a Major
Modification, which includes the appropriate application, fee, plans and other supporting documentation as part of a
complete major modification package. As such, this minor modification application will need to be returned and a new,
complete major modification application package will need to be submitted.
Please let me know if you have any questions or concerns.
Thanks,
Garrett Zorda
Environmental Engineer
Division of Energy, Mineral and Land Resources — State Stormwater Program
Department of Environmental Quality
910 796 7215 office
910 796 7345 direct
aarrett.zorda(ci)-ncdenr.aov
127 Cardinal Drive Ext.
Wilmington, NC 28405
EmailIl -2t'.0 fr}�ri: t0is c'ClCiio,'*S' iz,, s b';9 t to t7!e
fiJ•�r`!,; Carolina i rr. <'t of-d._ L3: 3;:C .,''13`r prU 1=a14i�°
From: Ray Marconi [mailto:[e-mail]]
Sent: Tuesday, March 24, 2020 9:03 AM
To: Zorda, Garrett D <[e-mail]>
Cc: Eric Stumph <[e-mail]>
Subject: [External] FW: SW8 050547 - Wilmington International Airport EDDB
erria>. Do not click [inks or open attachments urs
Garrett,

I received an email from Tina stating you were assigned to the Stormwater Review for the Air Carrier Apron Expansion
Phase I project at Wilmington International Airport.
Given the Airport's more complex stormwater permitting history and multiple permits, a scoping meeting with Linda
Lewis was held on May 21, 2019 to review the basic concepts of our proposed development and treatment. We are also
the Engineer that developed the Airport's stormwater master plan and assisted with several other permit approvals. If
you have any questions, I would be happy to assist.
Will you please provide estimated time when you expect to have the review completed?
Thank you for your time,
Ray Marconi, PE
4810 Shelley Drive
Wilmington, NC 28405
[phone] / Phone
From: Burd, Tina J <[e-mail]>
Sent: Thursday, February 06, 2020 4:11 PM
To: [e-mail]; Ray Marconi <rmarconi([e-mail]>
Subject: SW8 050547 - Wilmington International Airport EDDB
The Wilmington Regional Office of the Division of Energy, Mineral and Land Resources (Stormwater Section) accepted
the Stormwater Permit Minor Modification Application for the subject project on January 29, 2020. The project has
been assigned to Garrett Zorda and you will be notified if additional information is needed. Please be advised that the
construction of built -upon area may not commence until the Stormwater Permit is issued.
Best Regards,
Tina Burd
Administrative Associate II
Wilmington Regional Office
Division of Environmental Assistance & Customer Service
Phone [phone]
NCDEQ
Wilmington Regional Office
127 Cardinal Drive Ext.
Wilmington, NC 28405
Erm # ,;'J?"-es''?onclr: nog fi .. ;i :"t ! "�:aS 9�t to., t3
North vurC l'IT) t�UrJli � F'_ '7f _ 3l7C7 !" ;;Si t78 C! ��:IiJ;S :s tQ 1:�1 r rJ' iCic^r(V& s.

Johnson, Kelly
From: Stephen Ballentine<[e-mail]>
Sent: Friday, March 13, 2020 9:06 AM
To: Johnson, Kelly
Cc: Brian Downs
Subject: RE: [External] .054 Circle K Airport Blvd, Wilmington - NCDEQ Stormwater Permit
Application Form (SW8 050547)
Attachments: Sheet C3.0 Phase 3 Basin Expansion Plan.pdf; SW8 050547 Ph 3 Approved Modification
2011-10-26.pdf; Phases 1 & 2 Dry Pond Sheet P-2 Extended Dry Detention Basin 1.pdf
ail, Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Hi Kelly,
See my comments below in green.
Thanks,
-Stephen
From: Johnson, Kelly <[e-mail]>
Sent: Wednesday, March 11, 2020 4:29 PM
To: Stephen Ballentine <SteDhen.Ballentine &timmons.com>
Subject: FW: [External] .054 Circle K Airport Blvd, Wilmington - NCDEQ Stormwater Permit Application Form (SW8
050547)
Hi Stephen,
I wanted to follow up on our call from yesterday. I read through the information you sent. I think there are three main
areas of discussion:
Dry Pond #3: It looks like the 2004 Stormwater Master Plan was something negotiated before the first permit
was issued in 2005. The State "approved" it in November 2004 and they probably applied for their first permit
shortly thereafter. Page 2 of the stormwater plan refers to two basins. The first permit was issued in 2005 and
it only has one basin. It appears that they had not designed the second one yet, but that they had envisioned it
when they wrote the master plan. Perhaps a third was added later?
I know that a single extended dry detention basin was constructed for Phases 1 and 2. See attached PDF
plan. (It is possible that there might be another, smaller pond somewhere else on the airport's property, which I
am not aware of. However, since it is not near our Circle K drainage area, it should not be relevant to our Circle
K project.)
-Stephen
That could also be why the 2011 version of the permit shows Phase III at 1.5" rather than 1.0" per the 2004
Master Plan? I have not gone through the file carefully enough to determine whether or not there is a
permitted dry pond for the Phase III area or the details of that design.
Yes. Attached is the Phase 3 approved permit and the construction drawing showing the expansion of the
existing Ph 1 & 2 extended dry detention pond to accommodate Phase 3. This phase 3 pond expansion has not
been constructed to date.
-Stephen

From our conversation it seems that there is, and that you want to modify it because a modified one would work
better for the location you have decided to build.
Our current intent is to not construct the attached Phase 3 expansion of the existing Phase 1 & 2 dry
pond. Rather, we intend to construct a new, separate Phase 3 extended dry detention pond.
-Stephen
The cover page of the 2011 permit says, "The project name is changed to remove the Phase 1, 11 and 111
designation. The phases refer to the construction of the dry detention basin, not to any particular stage of BUA
development within the airport. This permit contains design information for the "Phase 1 and 11" dry detention
basin serving a 28Z63 acre drainage area and for the "Overall built -out dry detention basin serving a 322.34
acre drainage area." The current (2019) permit only lists two dry basins called "Phase 1 & II" and "Overall". I do
not know that there is a designed/permitted third dry pond?
Currently, there is not a designed/permitted third extended dry detention pond. However, Timmons Group is
designing the separate Phase 3 extended dry detention pond.
-Stephen
2. Type of System: Page 16 of the 2004 Stormwater Management Plan says that the airport will use dry ponds
(50% TSS) and grass swales (35%TSS) for a total of 85% TSS, as was required by law. This was because many
years ago that is how treatment trains were calculated. The goal was to reduce potential issues with birds as
discussed on Page 2 of the Plan. Page 18 of the 2004 Stormwater Management Plan says that, "to the extent
possible, position the bottom of the basin above the seasonal high water table." Page 25 describes that the plan
is conceptual, and that it could be modified over time. Your design can use a dry pond + swale as discussed in
the plan, but you would have to demonstrate that if you intercept the water table that you have minimized the
impact "to the extent possible". That would mean that you have considered other options that do not intercept
the water table such as a larger surface area of dry pond that is more shallow, or a system other than a dry pond
that does not have a permanent pool of water.
Understood. We will address this in our stormwater report narrative, which we will include with our application.
-Stephen
Land Ownership: I think this took a turn yesterday because there were so many moving parts. In thinking this
through today, if the airport owns the land and they lease land to Circle K, and the airport wants the gas station
to fall directly under their permit (SW8050547) as opposed to getting a second permit for the Circle K then there
is a way to do that. But, the airport should be aware that if Circle K does not build per this plan that the airport
will be the one that would be found in violation and not Circle K. This would become a civil matter between
them. So, the airport could apply for a modification to add the Circle K as you have described.
Understood/agreed. Circle K will coordinate with the airport as needed on this.
-Stephen
If you have further questions, please let me know.
No further questions at this time. Thank you.
-Stephen
Thanks,
Kelly
From: Stephen Ballentine fmailto:[e-mail]]
Sent: Tuesday, March 10, 2020 3:00 PM

To: Johnson, Kelly <[e-mail]>
Subject: [External] .054 Circle K Airport Blvd, Wilmington - NCDEQ Stormwater Permit Application Form
CAUTION:
Good afternoon Kelly,
FYI, here is some additional information for you:
• The Circle K site, pond site, and surrounding areas are on land owned by New Hanover County, but controlled by
Wilmington International Airport.
• The land will continue to be owned by New Hanover County.
• Circle K will have a lease agreement with New Hanover County and/or the Airport, but Circle K will not actually
own land.
• The Wilmington International Airport will be the applicant on our NCDEQ Stormwater Permit Application, and
the SCMs will be owned and maintained by the airport. These are regional SCM's, which will treat runoff from
Circle K and other future developments on the airport controlled land.
My understanding is that we will need to submit for a modification of SW8 050547 using Stormwater Management
Permit Application Form SWU-101, and that this must be submitted via standard review.
https:Hdeg.nc.goy/about/divisions/energy-mineral-and-land-resources/stormwater/stormwater-program/post
construction [nam03.safelinks. protection.outlook.coml
If you believe otherwise; then nlease let me know.
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com rnam03.safelinks.protection.outlook.comI
jnam03. safelin ks. protection. outlook.coml
5410 Trinity Rd, Suite 1021 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen.ballentineO-timmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here [nam03.safelinks.protection.outlook.comI
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From: Johnson, Kelly <[e-mail]>
Sent: Tuesday, March 10, 202011:45 AM
To: Stephen Ballentine <[e-mail]>
Subject: FW: [External] RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Existing Extended Dry
Detention Basin constructed in 12-ft deep cut
Hi Stephen,
I have attached the emails you sent this morning to the thread from last week to keep them all together. Here are the
answers to your questions:

The SW8 050547 permit is issued to the New Hanover County Airport Authority. If I remember correctly your project
will be for a gas station (which I assume is a different owner?) If your project is inside the project area permitted under
SW8 050547, then the airport can apply to subdivide their permit to create an offsite lot for the gas station and deed
restrict it to a specific amount of impervious. Then the gas station can apply for an offsite permit to drain to SW8
050547. What I do not know are the details of the treatment system for SW8 050547 (design storm, treatment system,
other limitations, etc.). If anything unusual was permitted under that permit then you would have to follow the terms of
whatever was previously decided.
Kelly
From: Johnson, Kelly
Sent: Thursday, March 5, 2020 4:28 PM
To: Stephen Ballentine<[e-mail]>
Cc: Hall, Christine <[e-mail]>; Brian Downs <[e-mail]>
Subject: RE: [External] RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Existing Extended Dry
Detention Basin constructed in 12-ft deep cut
Hi Stephen,
This is quite a lot of information to review before we get an application in-house. I have not read through it. But, if this
is in line with something already approved then just go ahead and submit the application. But, if this is a new system
that wasn't covered in the original approval then you will have to demonstrate that it will work. I do not know what the
circumstances were for approving the original system or what alternatives were (or could) be used.
Kelly
From: Stephen Ballentine [mailto:[e-mail]]
Sent: Thursday, March 5, 202011:15 AM
To: Johnson, Kelly <[e-mail]>
Cc: Hall, Christine <Christine.Hall @ncdenr.eov>; Brian Downs <[e-mail]>
Subject: [External] RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Existing Extended Dry Detention
Basin constructed in 12-ft deep cut
• - not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Good morning Kelly,
Attached is one more piece of background information for you. This is a record drawing/plan of the existing Phase 1 & 2
Extended Dry Detention Basin, located to the southeast of our Circle K site, which provides stormwater management for
the majority of the Wilmington International Airport's built -upon area.
Notice how the north end of this basin was constructed in an area with as deed as 12--feet of cut (presumably below the
SHWT). What we are requesting with our Phase 3 basin is consistent with what NCDEQ previously approved within
Phases 1 & 2. The airport's property is large and flat, and NCDEQ was flexible with the airport's design approach with
this existing basin.
Regards,
4

Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com [nam03. safelin ks. protection. outlook. coml
[nam03. safelin ks. protection. outlook. coml
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.23671 Fax: [phone]
Cell: 919.812.8887
stephen.ballentineCcDtimmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here [na m03.safel inks. Protection.outlook.coml
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From: Stephen Ballentine
Sent: Thursday, March 5, 202011:02 AM
To: Johnson, Kelly <[e-mail]>
Cc: Hall, Christine <[e-mail]>; Brian Downs <[e-mail]>
Subject: RE:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater - Pre -Treatment Swales Design Criteria
Kelly,
Please refer to the attached items:
Previously approved Pretreatment Grass Swales Sheet C3.0.
o This plan shows that two 150-LF grass swales were constructed in areas of.10-ft deep excavation
(presumably below the SHWT) for the Phase 1 and Phase 2 drainage areas.
o Question: Our proposed Phase 3 with Circle K intends to provide similar grass pre-treatment swales
(150 LF and below SHWT) as the existing Phase 1&2 swales described above. Please reply to let us know
if this approach will be acceptable in order to meet NCDEQ's requirements for the grass pre-treatment
swales for Phase 3.
• Total Proposed Grass Swale Length =150'
• Proposed Grass Swales constructed in areas of excavation (likely below SHWT).
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com rnam03.safelinks. protection. outlook. coml
[nam03.safelinks.protection.outlook.comI
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984:255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen.ballentineCcDtimmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here [nam03.safelinks.protection.outlook.com1
[nam03.safelinks.protection.outlook.com1

From:'Stephen Ballentine
Sent: Thursday, March 5, 202010:44 AM
To: Johnson, Kelly <[e-mail]>
Cc: Hall, Christine <Christine.Hall @ncdenr.eov>; Brian Downs <[e-mail]>
Subject:.054 Airport Blvd - SCM Coordination with NCDEQ Stormwater
Kelly,
See attached previously approved stormwater permitting items for your reference:
• SW8 050547 approved modification including Phase 3 drainage area.
o Phases 1, 2, & 3 drainage areas of the airport property are approved for high density. Refer to the tables
on page 8 of the attached permit for the BUA area allowances for each phase.
• Approved Phase 3 Extended Dry Detention Basin Modification Plan
• DA Map showing Phase 3 drainage area and our proposed Circle K site.
Our Circle K project is located within the "Phase 3" drainage area of the airport. See attached SW8 050547 modification,
which NCDEQ approved in 2011. See attached Phase 3 modification of the existing extended dry detention basin, which
was approved, but the Phase 3 expansion of the existing basin to the east of our site was not built.
Our project would be submitting a modification to SW8 050547, which would include the construction of a new Phase 3
extended dry detention basin and pre-treatment grass swales located in the southwest corner of the Phase 3 drainage
area. Due to the existing flat topography, the extended dry detention basin and the grass swales would need to be in
areas of cut, and could be below the SHWT. (This is similar to SCMs, which NCDEQ previously approved in Phases 1 & 2
with the existing grass swales and existing dry basin to the east.)
NCDEQ approved the Airport's Stormwater Master Plan with alternative measures to allow the airport flexibility to
achieve their goals. The airport's existing dry basin was constructed in a deep cut, which likely encroached into the
SHWT in areas. We are asking NCDEQ to show us the same flexibility with our SCM design, and to allow the same type
of alternative measures, which NCDEQ previously approved with Phases 1 & 2, including grass swales and extended dry
detention basins in deep cuts, which may be below the SHWT.
We would like to have you onboard with the above issues before we proceed with our full design & submittal. I am
available via email or phone.
Thanks for your assistance.
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com [nam03.safelinks.protection.outlook.com1
rnam03.safelinks. protection.outlook.comj
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen.ballentinehtimmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here [nam03.safelinks.protection.outlook.com1
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From: Johnson, Kelly <[e-mail]>
Sent: Thursday, March 5, 2020 8:59 AM
To: Stephen Ballentine<[e-mail]>
Cc: Hall, Christine <Christine.Hall @ncdenr.eov>; Brian Downs <[e-mail]>
Subject: FW: [External] Dry Pond Below SHWT with clay liner
Stephen,
I issue stormwater permits in the regular program. I am not familiar with this document. I didn't read it in detail, but a
quick skim looks like it was developed to let the airport develop as low density to 30% with pockets of high density. It
establishes 13 sub -basins and discusses some specific dry detention systems. Would this be to implement something
that has already been approved? Or would this modify something that was previously approved? Or would it be
something completely new? If you are adding impervious will the project remain at/below 30%? Is this inside the
original project area of the permit?
As for the clay liner question, I have been told by soil scientists over the years that liners do abetter job of keeping
water inside a pond than they do keeping water out of a pond. I have been told that the bentonite cracks under the
hydraulic pressure of trying to keep water from seeping into a lined system. But, I am not an expert in this
department. I think you would have to demonstrate that the liner would function indefinitely in the proposed capacity.
Also, again, I do not know anything about this permit. (Are we talking about SW8 040836?) We would have to see how
that permit is written, what area it covers, etc. As Christine has pointed out, this would be a deviation under the current
stormwater rules.
Kelly
From: Hall, Christine
Sent: Thursday, March 5, 2020 8:24 AM
To: Johnson, Kelly <[e-mail]>
Subject: FW: [External] Dry Pond Below SHWT with clay liner
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Stephen Ballentine[mailto:[e-mail]]
Sent: Wednesday, March 4, 2020 5:30 PM
To: Hall, Christine <[e-mail]>
Cc: Brian Downs <[e-mail]>
Subject: RE: [External] Dry Pond Below SHWT with clay liner
Christine,
Thanks for your message. Please provide me with a name, email, and phone number of someone in the regular
stormwater program, who I should discuss this with.

The Wilmington International Airport's Stormwater Masterplan was approved back in 2004 with alternative stormwater
measures.
• Per pages 17 and 18, the following SCMs will be proposed:
• Grass pre-treatment swales in series with Extended Dry Detention Basin.
This is consistent with the existing stormwater SCM's constructed to serve the overall airport property.
Regards,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com lnam03.safelinks. protection.outlook.coml
Inam03.safelinks.protection.outlook.comI
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen.ballentineO-timmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here fnam03.safelinks.protection.outlook.com1
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From: Hall, Christine <[e-mail]>
Sent: Wednesday, March 4, 2020 5:06 PM
To: Stephen Ballentine <[e-mail]>
Subject: RE: [External] Dry Pond Below SHWT with clay liner
Stephen,
I'm not aware that a dry detention basin is considered to be a primary SCM per 15A NCAC 02H.1002(37). How is the
project intending to demonstrate compliance with the stormwater rules?
I cannot comment on the acceptability of a clay liner until the full design is presented as part of a submittal
package. However, the dry detention basin section of the design manual does not appear to support setting dry
detention basins any lower than 6" above the SHWT.
15A NCAC 02H.1003(6) addresses projects that propose any variations from the rules or established minimum design
criteria. Please note that projects proposing alternative designs must be submitted to the regular program. The fast
track and express programs are not set up for these types of projects.
Christine
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

From: Stephen Ballentine[mailto:[e-mail]]
Sent: Wednesday, March 4, 2020 2:19 PM
To: Hall, Christine <Christine.Hall @ncdenr.eov>
Subject: [External] Dry Pond Below SHWT with clay liner
CAUTIO
ter{ amn�. c
Good afternoon Christine,
Are you okay with us using an extended dry dentention basin, which is below the SHWT, if we use a clay liner?
Thanks,
Stephen Ballentine, PE
Project Manager
TIMMONS GROUP I www.timmons.com fnam03.safelinks. protection. outlook. coml
[nam03.safelinks. protection. outlook. corn'!
5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607
Office: 984.255.2367 1 Fax: [phone]
Cell: 919.812.8887
stephen.ballentineO-)timmons.com
Your Vision Achieved Through Ours
To send me files greater than 20MB click here [nam03.safelinks.protection.outlook.com1
Inam03.safeli nks. protection.outlook.coml
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Burd, Tina J
From: Burd, Tina J
Sent: Thursday, February 6, 2020 4:11 PM
To: '[e-mail]'; '[e-mail]'
Subiect: SW8 050547 - Wilmington International Airport EDDB
The Wilmington Regional Office of the Division of Energy, Mineral and Land Resources (Stormwater Section) accepted
the Stormwater Permit Minor Modification Application for the subiect project on January 29, 2020. The project has
been assigned to Garrett Zorda and you will be notified if additional information is needed. Please be advised that the
construction of built -upon area may not commence until the Stormwater Permit is issued.
Best Regards,
Tina Burd
Administrative Associate II
Wilmington Regional Office
Division of Environmental Assistance & Customer Service
Phone [phone]
NCDEQ
Wilmington Regional Office
127 Cardinal Drive Ext.
Wilmington, NC 28405
I

Application Completeness Review Checklist (Non-Transtersi - Short version
Project Name: KJG f{fisJL: J� C:�w+T sZf�l?T i/ 7r
_ { AL) Hfl� i y bate Deiivered to WIRO: t � Z
Project County/Location: JE L ] �tA r� �-fie q,,� P 6 Z r RIMS Received./Accepted Date:
Rule(s): El2017 Coasta' 1:12008 Coastal r"1995 Coastal BiMS Acknowledged Date:
0Phase Il Universal �1988 Coasta+
Permit Action: New FN ew Permit #z:
Major Mod KyMinor):j Renewal ®i=xisting Permit#: 5 Jam, -52547
Permit Type. HD i LD / LD Overall / HD &LD Combo Expriation Date r,;`it AIZ7
General Permit / Offsite / Exempt / Rescission
Development Type: Commercial / Residential the, (n."ki kkZPbe_T
Subdivided?: Subdivision or Single Lot
Permittee Type & Documents Needed:
� Rroperty Owner(s) Purchaser
❑LesseE
F-11Jiable? ElViabie?
E]V'iabie%
Deed ElPurchase Agmt
01.ease
[]Not Subdivided Reed
17Subdivision7 Common Area Deed
E]$505 (within 6mo) Cheek#(s):
DI)ffsite to SW&
ElLot is in Master Permit"
Ell Cert. on :pie'
❑HOA MDeveiaoer
Viable? Viable%
Election Minutes
(1 new form or for older forms: 1 original per SCM)
Report (Infli or PP)
Calculations (signed/sealed)
Deed Restrictions, if subdivided'
®Project Narrative
"l1SGS Map (or on fife?) Subject to 50Y / N
0Plans (2 Sets)
®PE Certification
EElectronic Copies
Easements. Recorded (2017 Rules)
NOTES:
Elva Fee
Subject to ORW?: Y / N
'Enter BIMS Acknowledged Daze on this Sheet
For New Projects -Enter New Permit # on Supplements & Deed Restiction Temoiaies.
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WAILED ENGINEER DATE:
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TIM ONS GROUP
YOUR VISIGN ACHIEVED THROUGH OURS.
Project Name: Circle K— NTI Airport -Wilmington
Timmons Project #: 37630.054
Date: 2019-12-04
Stormwater Management Feasibility
Background:
We have been asked to study whether or not the stormwater for this project can be accommodated by
multiple existing pond features located approximately 1,500 feet to the east of the Circle K site. We
have been asked to design a proposed drainage ditch, which extends from the Circle K site to the
existing pond features. To date, we have not been provided with any record stormwater calculations &
record engineering drawing/details of the existing pond features. We understand that there is the
intent to develop a large tract of property to the east of the Circle K property.
Issues:
• The existing upper pond feature has existing 72-inch RCP storm pipes entering and exiting the pond
features. Therefore, there is a very large drainage area and flow entering the existing pond from the
north.
• Without having a copy of the approved stormwater report for the existing pond features, it is
unknown whether or not the existing pond features were designed to handle stormwater from the
Circle K site.
• It is unknown when the existing pond features were constructed. If they were not constructed
within the past 15 years, then it is unlikely that they were designed to comply with current NCDEQ
stormwater requirements for new development, including the Circle K project.
• The existing Circle K property does not drain towards the existing pond features in the existing
condition. Therefore, it is unlikely that the existing pond features were designed/sized to handle
flow from the Circle K property.
• Based on our surveyed topography of the existing upper pond feature, it appears to be very small in
proportion to the overall drainage area. Therefore, we understand that it was not designed to meet
the requirements of the NCDEQ Stormwater BMP Manual.
• The existing upper pond feature appears to have a top of dam elevation of 24.
o Although we have not designed a grading plan for the Circle K site to date, we anticipate
that the Circle K grades will be in the range of 23 to 26.

o Based on the above information, if we were to extend a drainage conveyance from the
Circle K site to the existing pond features, then there is the potential during large storms for
stormwater to back up through the ditch, and inundate the Circle K parking lot.
o The existing topography is not conducive for sending the Circle K stormwater to the existing
storm features, because the existing pond features are too high in elevation, as related to
the Circle K site.
• If Circle K were to attempt to utilize the existing stormwater pond features to meet the NCDEQ
stormwater requirements, then we anticipate that NCDEQ would require that all existing pond
features be as -built surveyed, and that the pond(s) be significantly expanded/retrofitted to meet
current NCDEQ stormwater requirements. We anticipate that NCDEQ would require the existing
ponds to be fully re -designed per current standards. A new stormwater study of the entire existing
and ultimate drainage area (potentially >100 acres) to the existing pond(s) would be required.
• The limited survey data, which we have of the existing upper pond feature does not show any riser
in the pond. We have very little survey data of the existing lower pond feature.
• Our preliminary ditch design might not be feasible due to the following issues:
o The prelim ditch design crosses an existing 15"RCP storm pipe. There is a wetland nearby. It
is possible that this drainage feature might be a jurisdictional riparian buffered stream. This
would need to be investigated/confirmed. The ditch also crosses over an existing 36"RCP. It
is an unusual practice to cross over a storm pipe with a ditch.
o The prelim ditch design crosses over an existing paved access drive. As shown, the existing
access drive would be severed. This might not be allowed. We do not currently know
who/what this access drive serves. It is likely that we would have to pipe our ditch under
this access drive.
o Our survey shows that the ditch runs through an existing 8" water main and an existing
gravity sewer main. Although our limited survey information does not show it, it is likely
that these are public water and sewer mains, with public water and sewer easements. The
municipality would likely require the ditch to be piped through the water and sewer
easement at a 90 degree angle. We may need subsurface utility locate information on the
existing utilities at the crossing in order to design our storm pipe to avoid pipe conflicts.
o The prelim ditch is designed at 1/2 percent slope. This is not recommended, because at this
flat slope, in our experience, the ditch will likely accumulate several feet depth of sediment
over the course of 10 years, potentially causing stormwater to backup on Circle K property.
Routine excavation of the sediment from the ditch would be needed.
o The prelim ditch design would cause stormwater from the existing pond feature to be
circumvented during large storms, due to the topography_ The ditch crosses a low area of
elevation 19. The existing pond feature has a top of dam elevation of 24.
■ In order to avoid circumventing the pond feature, a 1,400 foot long berm adjacent
to the ditch would need to be constructed at elevation 24 or higher.
• This 1,400 foot long ditch/berm would effectively become a part of the existing
pond. The ditch would elongate the pond by 1,400 feet. During large storms, this
elongated ditch/berm would cause a significant area of inundation/flooding on the

future development area between the Circle K property and the existing pond
features unless a large volume of dirt were imported from offsite in order to raise
the elevation of the future development.
o The prelim ditch design would cause a large drainage area to be re -directed away from its
existing drainage pattern. This is not recommended, and generally not allowed from a
legal/liability standpoint, as it could have adverse drainage & flooding impacts to
downstream properties.
o The cost to grade the 1,400 ft long drainage ditch and earth berm would be significant.
o An offsite drainage easement would be needed.
o This drainage ditch could reduce the development potential of adjacent properties to the
east of Circle K.
Conclusions:
For the above reasons, we do not believe it is feasilble for the Circle K project to construct a 1,400 foot
long drainage ditch to utilize the existing pond features located 1,500 feet to the east for Circle K
stormwater management.
Recommendations:
In order to meet the current NCDEQ stormwater requirements for the Circle K project, we recommend
exploring the following stormwater alternatives:
• In the existing condition, the majority of the Circle K property drains to the south, through an
existing 24" RCP culvert under N 23rd Street. In order to maintain the existing drainage pattern, we
recommend that a stormwater SCM be designed to the south of the Circle K property, just southeast
of the proposed "Private Street" driveway intersection of N 23rd Street, near the existing 24"RCP
culvert. Options for this stormwater SCM could include a proposed wet detention pond,
bioretention, sand filter, stormwater wetland, ConTech Stormfilter, and/or underground detention.
• We recommend that the future overall development around Circle K be master plan designed, and
include regional stormwater facilities for the master planned overall project. We anticipate that this
would include multiple stormwater SCMs, based on the existing topography. The topography
indicates the need for a new stormwater SCM located approximately 500 feet to the southeast of
the Circle K property. This additional SCM should not be needed for the Circle K project, but is
anticipated to serve the future development to the east of Circle K.
• Given the above issues, we do not anticipate that the existing pond features should be used to
handle the comprehensive stormwater needs of the overall future master planned area. It is
possible that the existing pond features could be utilized to handle a portion of the future master
planned area, far to the east of the Circle K project. However, given the issues above, it might be
more practical to construct new stormwater SCMs than to analyze and retrofit/expand the existing
pond features.

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