SW8040836_Historical File_20160104

PAT MCCRORY
Governor
DONALD R. VAN DER VAART
Energy, Mineral
and Land Resources
ENVIRONMENTAL QUALITY
January 4, 2016
Julie Wilsey, Airport Director
New Hanover County Airport Authority
1740 Airport Boulevard
Wilmington, NC 28405
Subject: Updated Master Plan BUA Table
Wilmington International Airport
State Stormwater Management Permit No. SW8 040836
New Hanover County
Dear Ms. Wilsey:
secretary
TRACY DAVIS
Director
On September 9, 2015, the Wilmington Regional Office approved a plan revision for the Extended Dry
Detention Basin #1 permitted under SW8 050647. All of the built -upon area approved under that permit
has been accounted for in the Master Plan permit, as indicated in the attached updated Master Plan BUA
Table for SW8 040836.
The remaining overall amount of built -upon area within the Master Plan is 2,991,489 square feet. Please
be aware that all terms and conditions of the permit issued on November 29, 2012, and all of the
previously approved plan revisions, remain in full force and effect. Please also understand that the
approval of this updated Master Plan BUA Table for the subject State Stormwater Permit is done on a
case -by -case basis. Any other changes to this project must be approved through this Office prior to
construction. The approval of the updated Master Plan BUA Table does not preclude the permittee from
complying with all other applicable statutes, rules, regulations or ordinances which may have jurisdiction
over the proposed activity, and obtaining a permit or approval prior to construction.
If you have any questions concerning this matter, please do not hesitate to call me at [phone].
Sincerely,
/,*�, 06CA...) eY-.1"
Linda Lewis, E.I.
Environmental Engineer III
GDS1arl: G:1WQ1SharedlStormwaterlPermits & Projects120041040836 HD12016 01 permit-pr 040836
cc: Jeremy Blair, P.E., Paramounte Engineering
New Hanover County Building Inspections
Wilmington Regional Office Stormwater File
State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources
127 Cardinal Drive Extension I Wihnington, NC 28405
910 7% 7215 T 1 910 350 2004 F I httn://oortal.ncdenr.ora/web/lr/

SW8 040836 MASTER TABLE
Originally issued November 24, 2004
Last updated
9/9/2015
Total Site Area
1620.8
30% Overall BUA Max.
486.2
Existing BLJA as
of November 24, 2004
260.6
Remaining BUA as of update date
187.675
8175123
Extended Dry Detention Basin (EDDB #1)
Ph 1 & 2 Max BUA =
8520835
Remaining BUA=
2991489
Master
Plan BUA
EDDB #1
Permit #
Date
Project name
BUA Added
Cumulative
BUA Added
Cumulative
SW8 040836
11/24/2004
Master - existing BUA
260.6
4552087
SW8 040918
11/24/2004
Perimeter Road Ph. 1
2
262.6
SW8 040926
10/15/2004
GA Apron Rehab
0
262.6
SW8 991003
12/30/2004
T-Hangars
0.38
262.98
SW8 050547
6/15/2005
EDDB #1
0
262.98
SW8 050801
8/12/2005
GA Apron Expansion
1.45
264.43
151589
4703676
SW8 060326
4/7/2006
Air Wilmington FBO Building
4.52
268.95
196725
4900401
SW8 060425
4/27/2006
Runway 6-24 Rehab
0
268.95
0
4900401
SW8 060515
5/18/2006
Terminal Parking Lots
4.63
273.58
201655
5102056
SW8 040836
8/31/2006
Runway 6-24 ILS
1.56
275.14
0
5102056
SW8 040918
7/18/2007
Perimeter Road Ph. II
4.08
279.22
0
5102056
SW8 060515
5/14/2008
Credit Card Parking Lots
5.18
284.4
225722
5327778
SW8 040836
12/19/2008
Temporary Concrete Batch Plant
0.85
285.25
0
5327778
SW8 050547
10/28/2009
EDDB #1 Expansion
0
285.25
15843
5343621
SW8 040836
7/12/2010
35 MALSR Catwalk, 35 ILS, 6-24 PAPIS
-0.11
285.14
0
5343621
SW8 040836
3/29/2011
Taxiway A, D, F and H Rehab
-0.31
284.83
0
5343621
SW8 040836
1/9/2011
Remove Temp. Conc. Batch Plant
-0.85
283.98
0
5943621
SW8 040836
12/9/2011
Taxiway B, C, J and G paved shoulders
7.74
291.72
0
5343621
SW8 040836
7/23/2022
Runway 17 and Taxiway A Extension
2.12
293.84
0
5343621
SW8 040836
8/6/2012
Security Fencing
0
293.84
0
5343621
SW8 040836
10/4/2012
Air Wilmington Hangar No. 3
0.41
294.25
0
5343621
SW8 050547
2/8/2013
Consolidated Rental Car Facility
4.71
298.96
205202
5548823
SW8 040836
6/11/2014
Runway 24 Wildlife Hazard & NAVAID
0
294.25
0
5343621
SW8 040836
8/4/2015
Apron Rehab
0.745
294.995
32453
5376074
SW8 050547
9/9/2015
ILM Flex Space
1.53
296.525
GRIM
5442586
SW8 050547
9/9/2015
Business Park Access Road
1.44
297.965
62570
5505156
SW8 IS0723
9/15/2015
Air Wilmington Hangar No. 4
0.56
298,525
24190
5529346
298.525
5529346
298.525
5529346
298.525
5529346
298.525
5529346

F DEMLR USE ONLY
Date Received
Fee Paid (express only)
Permit ber
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT PLAN REVISION APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Stormwater Management Permit Number: SW 8 040836
North General Aviation Apron Pavement Rehabilitation, Storm Water Improvements,
2. Project Name: and Apron Expansion (Schedules I. II. III. & V)
3. Permit Holder's name (specify the name of the corporation, individual, etc.):
4. Print Owner/Signing Official's name and title (person legally responsible for per v'
Julie Wilsey, Airport Director JUN 10205
5. Mailing Address for person listed in item 2 above: BY..
1740 Airport Boulevard
City: Wilmington State: NC zip: 28405
Phone: ( 910 ) 341-4333 Fax: ( 910 ) 341-4365
Email:—JW![e-mail]
II. PLAN REVISION INFORMATION
1 _ Summarize the plan revision proposed (attach additional pages if needed):
This proiect will remove 28,219 sf (0.65 ac) of existing impervious area and install 14,063 sf sf (0.32 ac),
resulting a deduction of 14,156 sf (0.33 ac) covered under permit SW8-040836 See additional pages
III. 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. The complete
application package should be submitted to the DEMLR Office that issued the permit.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original & 1 copy of the Plan Revision Application Form_ law
• Two (2) copies of revised plans (must be revisions of original approved plan sheet(s)) mkI
If applying for Express review (only available in 20 coastal counties):
• Application fee of $500.00 (made payable to NCDENR)
VI. APPLICANTS CERTIFICATION
I, (print or type name of person listed in General Information, item 3) Julie Wilse� T
certify that I have authorized these plan revisions and that the information included on this plan revision
application ' , to a best of y knowledge, correct and complete.
Signature: Date: 6 Ndof,5
Plan RevisioiYForm U Rev. Oct. 31, 2013

¢o -93(2
Lewis,Linda
From: Lewis,Linda
Sent: Wednesday, August 26, 2015 3:49 PM
To: '[e-mail]'
Cc: [e-mail]; [e-mail]
Subject: RE: Wilmington al-M) Airport Project and Master Stormwater Permit
I don't understand. Regardless of the amount of disturbance, the Master permit for the airport (SW8 040836) tracks all
of the constructed BUA to ensure that the overall low density aspect of the airport is maintained and to ensure that the
proposed project is not within the drainage area of the permitted BMP's for the Airport.
Was this road part of the recently approved August modification? If not, then it will need to be accounted for.
Linda
From: [e-mail] [mailto:[e-mail]]
Sent: Wednesday, August 26, 2015 3:18 PM
To: Lewis,Linda
Cc: [e-mail]; [e-mail]
Subject: RE: Wilmington (ILM) Airport Project and Master Stormwater Permit
Iv13. Lcwls,
The first phase of the. road has been paved and is complete. As stated below the soil disturbance .was less than an
acre. At this time we still do not know if or when the second part of the road will be built.
Due to funding and runway closure constraints, we are asking if we can delay the removal of the pavement (see red area
in the attachment) to offset the new pavement until at least November 2015 or possibly spring 2016. The second
phase of the road may be built in Spring 2016 so if possible the pavement could be removed at that
time. Nevertheless, we do not want to impact the airport's existing permit and will remove the pavement as required.
I have copied the project's project manager, Barrington Brown. Please advise as to how we should proceed.
Thank you for your assistance,
��kA3
tires\f`��
Karen Dorrell
Senior Environmental Engineer
Parsons/T4
3800 Camp Creek Pkwy
Building 2400, Suite 106
Atlanta, GA 30331
404-762-3586
404-559-1715fax
404-617-5229 cell

From: Lewis,Linda fmailto:[e-mail]]
Sent: Friday, July 10, 2015 11:05 AM
To: Dorrell, Karen CTR (FAA)
Cc: Julie Wilsey
Subject: RE: NPDES questions for upcoming Wilmington airport project
Please talk to Julie Wilsey before you do anything. The Airport usually triages their permit applications depending on
their need and funding availability, so it would be a good thing to make sure that this project fits into her upcoming
permit submission schedule.
I attach the permits and the most recent master tables for tracking the built -upon area, but they are currently both in
review for an Apron Rehab/Expansion project, so the tables will be changing from what is currently on file.
By law, we have 90 days from receipt of a complete application to issue a permit. Depending on the quality of the
application materials, it may take less time than that. There is also an Express review process available for a larger fee
that results in a permit within 30 days. However, if you have never done state stormwater permitting, you may not want
to go that route. It requires quality submissions that are near 100% complete and allows only 2 addinfo request events
(max 5 days turnaround for each) in order to issue a permit within the 30 day express time frame. The consultant and
the owner must attend a submission meeting where the entire application, plans, and calculations are reviewed for
completeness. The consultant must have a very good understanding of the applicable stormwater rules and
requirements, or the $2000 or $4000 fee may be forfeited and the application will have to be resubmitted for review in
the "regular" program.
Linda
From: Karen.CTR.Dorrellca�faa.gov fmailto:Karen.CTR.Dorrell(dfaa.gov]
Sent: Friday, July 10, 2015 10:33 AM
To: Lewis,Linda
Subject: RE: NPDES questions for upcoming Wilmington airport project
Ms. Lewis,
Thanks so much for getting back to me so quickly. We should have plans in the next couple of weeks. I assume the
plans need to be signed and sealed? I have reviewed the Stormwater Management Permit Application form. We will fill
it out as a modification to the existing Master stormwater permit. Once the complete application is submitted about
how long is the review process? Do we submit it to the DEMLR address below?
How do I go about getting a copy of these two permits?
Thanks again,
Karen Dorrell
Senior Environmental Engineer
Parsons/T4
3800 Camp Creek Pkvuy
Building 2400, Suite 106
Atlanta, GA 30331
404-762-3586
404-559-1715fax
404-617-5229 cell

From: Lewis,Linda fmailto:linda.lewis(&ncdenr.gov]
Sent: Friday, July 10, 2015 9:19 AM
To: Dorrell, Karen CTR (FAA); Julie Wilsey
Cc: Scott, Georgette; Gregson, Jim
Subject: RE: NPDES questions for upcoming Wilmington airport project
Ms. Dorrell:
Your email to Jim Gregson was forwarded to me. I'm not sure how helpful I will be, but here goes:
The Wilmington Airport is currently covered by a Master stormwater permit, SW8 040836. This permit accounts for the
overall low density of the airport and includes a high density component, an extended dry detention basin (EDDB) which
is permitted under SW8 050547, to treat the runoff from the "collected" landside built -upon areas (BUA) of the airport.
The runways and existing built -upon area on the airside are covered by the terms of SL 2012-200 (section c4), which I
have copied below:
PART VI. DIRECT THE DEPARTMENT OF ENVIRONMENT AND. NATURAL RESOURCES TO
ACCEPT ALTERNATIVE MEASURES OF STORMWATER CONTROL AT PUBLIC AIRPORTS
SECTION 6. G.S. 143-214.7 is amended by adding two new subsections to read:
"(6) In accordance with the Federal Aviation Administration August 28, 2007, Advisory Circular No. 150/5200-
33B (Hazardous Wildlife Attractants on or Near Airports), the Department shall not require the use of stormwater
retention ponds, stormwater detention ponds, or any other stormwater control measure that promotes standing water
in order to comply with this section at public airports that support commercial air carriers or general aviation
services. Development projects located within five statute miles from the farthest edge of an airport air operations
area, as that term is defined in 14 C.F.R. § 153.3 (July 2011 Edition), shall not be required to use stonnwater
retention ponds, stormwater detention ponds, or any other stormwater control measure that promotes standing water
in order to comply with this section. Existing stormwater retention ponds, stormwater detention ponds, or any other
stormwater control measure that promotes standing water in order to comply with this section located at public
airports or that are within five statute miles from the farthest edge of an airport operations area may be replaced with
alternative measures included in the Division of Water Quality's Best Management Practice Manual chapter on
airports. In order to be approved by the Department, alternative measures or management designs that are not
expressly included in the Division of Water Quality's Best Management Practice Manual shall provide for equal or
better stormwater control based on the pre- and post -development hydrograph. Any replacement of existing
stormwater retention ponds, stormwater detention ponds, or any other stormwater control measure that promotes
standing water shall be considered a minor modification to the State general stormwater permit.
(c4) The Department shall deem runways, taxiways, and any other areas that provide for overland stormwater flow
that promote infiltration and treatment of stormwater into grassed buffers, shoulders, and grass swales permitted
pursuant to the State post -construction stormwater requirements."
Any cumulative disturbances within the airport which are greater than 1 acre, or any additions to the amount of BUA, or
addition of BUA or changes within the permitted drainaee area of the extended dry detention basin, need to be
reviewed for compliance with the Master stormwater plan and permit, the extended detention basin permit (SW8
050547) and/or the Session Law, depending on what the project is and where it is located within the airport.
The master permit is currently set to expire on November 24, 2018. The SW8 050547 permit covering the EDDB will
expire on June 15, 2019. An application for permit renewal must be submitted at least 180 days before the expiration
date. If the road project were added to the permits, then even if the road was not built right away, it would continue to
be "permitted" when the permit is renewed. We would support going ahead and getting all of the road work approved
(both phases) as a modification to SW8 040836 and/or SW8 050547 and then wait for the funding to come through.

We usually work with the permittee, Julie Wilsey, airport director, on all projects within the airport property. Ms. Wilsey
has been copied on this email. All applications for development within the airport would need to be signed by the
permittee of record.
I sincerely hope that addresses your questions. If not, please feel free to email or call me — my contact information is
below.
Linda
Linda Lewis, E.I.
Environmental Engineer III
Division of Energy, Mineral and Land Resources
Wilmington Regional Office
127 Cardinal Drive Ext.
Wilmington, NC 28405
Main Office — 910-796-7215
Direct Line — 910-796-7343
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and maybe disclosed to
third parties.
From: Scott, Georgette
Sent: Thursday, July 09, 2015 4:29 PM
To: Lewis,Linda
Subject: FW: NPDES questions for upcoming Wilmington airport project
Linda, this was forwarded by Morelia. I know you handle most of the airport permits. Can you answer Karen? I believe
she is talking state stormwater not NPDES
Thanks
Georgette
From: Karen.CTR.DorreII(@faa.gov fmaiito:Karen.CTR.Dorrellaafaa.gov]
Sent: Thursday, July 09, 2015 2:35 PM
To: Gregson, Jim
Cc: King, Morelia s
Subject: NPDES questions for upcoming Wilmington airport project
I have a few questions for upcoming FAA projects at the Wilmington airport. There is a road project that will be
constructed probably in two phases. I am not sure about the schedule for the second phase. It could be late 2015, in
2016 or not at all. The first section of the road will have less than an acre of disturbance and is expected to start this
summer. We do not have funding for the second phase at this. time. If we were to go ahead and submit the SW Mgmt
Permit Application for the entire road how long is this stormwater permit valid? If we did do the project next year,
would that be considered a separate project or should the disturbance be considered with the first Phase?
We are just trying to decide if we should submit the permit app now and be ready for when we receive funding or just
wait to see if we will receive funding at all.
If I need to contact someone else to discuss these questions, please let me know.
Thanks,

Karen Dorrell
Senior Environmental Engineer
Parsons/T4
3800 Camp Creek Pkwy
Building 2400, Suite 106
Atlanta, GA 30331
404-762-3586
404-559-1715fax
404-617-5229 cell

8 1 7 6 1 5 4 1 3
2 1 1
----------- --- ------ --------------------------------------- ----- ----
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------ 190SF OBJECT......-.. r,REA (TYP)
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X X L _ — _ OF CONCRETE 404.766.1693
X X PROPOSED REIL (BY OTHERS) 404.559.1715 (Fax)
PCU RACK _
EXISTING (SEE NOTE 7) RELEASED FOR
LOCALIZER SHELTER FINAL SUBMITTAL- 10/07/2014
AMENDED - 06-08-2015
NOT TO BE USED FOR PERMITTING,
LEGEND
A 1 ® DEMOLITION AND REMOVAL OF CONCRETE.
1 SITE PLAN
\Q�Vi50, 0 50' 100,
SCALE: 1" - 50'
7 6 5 -IT6 4 3
NOTES
1. FOR GENERAL NOTES. SEE DWG G004.
2. RUNWAY 06-24 THRESHOLD LATITUDE/LONGITUDE
AND ELEVATIONS ARE BASED ON AMIS DATA SHEETS.
3. THE EXISTING SEWER FORCE MAIN SHALL BE LOCATED AND
PROTECTED DURING CONSTRUCTION.
4. ALL CONDUITS AND CABLES SHOWN ARE APPROXIMATE.
SUBCONTRACTOR TO VERIFY LOCATION ON SITE.
6. REMOVE EXISTING GRAVEL DRIVE THAT WILL BE UNUSED
AFTER THE INSTALLATION OF THE NEW PAVED ACCESS
ROAD. REESTABLISH DISTURBED AREA WITH SOD.
7. NEW REIL TO BE INSTALLED CONCURRENTLY WITH ACCESS
ROAD PROJECT. SEE DRAWING SERIES ILM-D-906013 FOR
REIL CONSTRUCTION PLANS.
8. IN ALL DISTURBED AREAS. INSTALL TOPSOIL TO RESTORE/
MATCH EXISTING GRADE AND SOD PER SPECIFICATION.
9. DIMENSIONS FROM CENTERLINE OF RUNWAY TO ACCESS ROAD
ARE SHOWN AS A MINIMUM. THE ACCESS ROAD CAN BE ADJUSTED
FURTHER AWAY FROM RUNWAY CENTERLINE IF NECESSARY TO
,KEEP GRADING OUT OF RSA.
CONSTRUCT 27 SF \
OF CONCRETE
(BY OTHERS)
tt
A
tt
CONSTRUCT 36 SF
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(BY OTHERS)
I '-- RUNWAY 06
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LAT, N 34" 15142.7932"
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Casmer, Jo
From: Casmer, Jo
Sent: Tuesday, June 23, 2015 3:56 PM
To: '[e-mail]'
Subject: Wilmington International Airport; Stormwater Permits SW8 0505047 and SW8 040836
The Wilmington Regional Office of the Division of Energy, Mineral, and Land Resources (Stormwater Section)
received the Stormwater Permit Plan Revision Applications on June 10, 2015. The projects have been assigned to
Linda Lewis and you will be notified if additional information is needed.
Jo Casmer
Administrative Assistant for DEMLR/Stormwater Section
NC Department of Environment & Natural Resources
127 Cardinal Drive Extension
Wiimington, NC 28405
Phone: [phone]
Fax: [phone]
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and mwy be disdosed to third
parties

TALBERT & BRIGHT, INC.
r
ENGINEERING & PLANNING CONSULTANTS
LETTER OF TRANSMITTAL
To: NC Division of Water Quality
127 Cardinal Drive Ext
Wilmington, NC 28405
WE ARE SENDING YOU:
❑ Shop Drawings
❑ Copy of Letter
® Attached
❑ Prints
❑ Change Order
Date: 6/10/15 Pro'. No. 3301-1303
Attention: Linda Lewis
Re: Wilmington International Airport
North GA Apron Pavement Rehab & SW Impro
Stormwater Permit Application Revisions —
Permit No. SW8 040836 & SW8 050547
❑
Under Separate Cover via
®
Plans
❑
Other
the following items:
❑ Specifications
ITEM
DATE
NO.
DESCRIPTION
1
Plan Revision Application Form no fee SW8 040836 (Original + One Co
2
Two Copies of Narrative with Impervious Calcs
2
Two Copies of Plan Sheets Al, A2, EX1-EX6, G1-G3, G10, & G11
1
Plan Revision Application Form no fee SW8 050547 (Original + One Co
2
Two Copies of Narrative with Impervious Calcs
2
Two Copies of Plan Sheets Al, A2, EX1-EX6, G1-G3, G10, & G11
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 Julie Wilsey SIGNED Ray Marconi
ENGINEERING & PLANNING CONSULTANTS
4810 Shelley Drive Wilmington, NC 28405 910.763.5350 FAX [phone]

Completeness review Checklist
eject Name: � Received Date: 0 Z-6 ��—
P.Dject Location: b Accepted Date: a` ra
Rule(s) El 2008 Coastal LJ1995 Coastal ®Phase II (WiRO.) LjUniversal 1988 Coastal
(Type of Permit: New or Mod !4 PR ) IExcisting Permit # (Mod or PR): n Q ^q,7e j--jPE Certon File?
Density: HD or LD Type: Commercial or Residential
%: (% OK?) Stream Class: SA Map
,NCG:
ite to SW8
ISUDdivided?: Subdivision or Single Lot 11 NORW Map I 8 Mxempt I
Paperwork Emailed Engineer on:
Supplements) (1 original per BMP) BMP Type(s):
O&M with correct/original signatures (1 original per BMP except LS/VFS and swales)
pplication with correct/original signatures Deed
®Corp or LLC: Sig, Auth. per SoS or letter Email Address: Design Engineer
�$505 (within 6mo) Email Address: Owner
Soils Report with SHWT '` `� � Hate to Revd ewer -
Calculations (signed/sealed)
No obvious errors' C� La--
iDensity includes common areas, etc
Deed Restrictions, if subdivided: 3 l ei' �ed'�--•� ��`� 2a&4"'"
Signed & Notarized
Lj
ELJLorreci i empaie ILOMMIKes & MULL)) or Uec. Lovenants & Rest:
11 _ ets Details (roads, cul-de-sacs, curbs, sidewalks, BMPs, Buildings, etc)
FF­nGrading Wetlands: Delineated or No Wetlands
Vicinity Map Eli Layout (proposed BUA dimensions)
Legend Fl===EDA Maps [IProject Boundaries
Crifiltration Wet Pond Offslte
Soils Report ®Soils Report MPE Cert for Master
SHWT: SHWT: Deed Rest for Master
Bottom: PP: BUA Permitted (Master):
Visited: BUA Proposed (Offsite):
Additional information:
Permitted Pd 000sed:
BUA (sf)
DA (sf)
PP (el)
SHWT (el)
Depth (ft)
SA (sf)
p v: po';e
Lot #:
r­ILot # Matches Master
PronaN pd-
sf
sf

North General Avation Apron Pavement Rehabilitation, Stormwater Improvements, and Apron Expansion project
at Wilmington International Airport
As previously discussed in the project scoping meeting on February 19, 2015, the airport is beginning the initial
work necessary to be able to provide a second Fixed Base Operator (FBO) on the north side of the airfield. This
project will allow for rehabilitation of some existing aircraft parking apron pavement and installation of drainage
infrastructure to accommodate this future development.
Project Narrative:
Please seethe attached Exhibit 'Project Area Map' for the Items listed below:
Item 1: The project will consist of rehabilitation of the existing 1940's era concrete aircraft parking apron. The
rehabilitation effort will include construction of an overlay of the existing concrete pavement. This rehabilitation
effort will also remove portions of existing pavement that will not be replaced, resulting in a decrease of the
existing built upon area. The apron currently drains to inlets located within the pavement area and the collected
stormwater is conveyed via drainage pipes to an existing ditch. Please see attached Exhibit 'A'showing the
removal of the existing pavement.
Item 4: As part of a bid alternative, the airport will be removing the existing hangar building where aircraft
currently park. This bid alternative will remove the hangar slab and construct concrete pavement in the location of
the existing concrete slab along with placing concrete pavement in the grassed areas east and west of the hangar
for aircraft parking. The built upon area constructed in the existing grass area will be more than offset by the
removal of existing concrete pavement located adjacent to and immediately west of the apron rehabilitation area.
Drainage patterns from this apron area will not change and the apron area will drain to the same drainage ditch as
it does today. As there is a decrease in BUA and the area will drain as it does historically to the same ditch, no new
BMPs are proposed. Please see attached Exhibit 'A' showing the removal of the existing pavement and installation
of new pavement.
Items 2 & 5: Along the western edge of the apron, a new storm drain, system (Item 2 - shown in red) will be
installed both to bring the apron into compliance with current National Fire Protection Association (NFPA)
standards and to allow for filling of the ditch (Item 5) for redevelopment of the area between the apron and Trask
Drive. Stormwater collected in the new drainage pipe (Item 2) will be conveyed to the existing ditch located north
of the apron being rehabilitated.
Based on our discussions February 19, 2015, Items 1, 2, 4, and 5 will be a Plan Revision covered under existing
Stormwater Master Plan Permit No. SW8 040836.
Item 3: In preparation for the future redevelopment, new drainage pipe (shown in blue) will be installed along the
eastern edge of Trask Drive. The drainage pipe will be connected to the existing drainage system that conveys
stormwater to Extended Dry Detention Basin #1 and the associated pre-treatment swales (Airport's existing
Regional BMPs under Stormwater Permit No. SW8 050547). Based on the approved permit SW8 050547
modification November 29, 2012, the proposed pipeline and drainage area are within Paramounte's'overall basin
map' (map attached with location of Item 3 shown). This system will be primarily utilized to drain the future
redevelopment with the potential for minor connections to the proposed drainage inlets. The future
development is anticipated to include hangars, hangar taxilanes and FBO terminal building in this area. The
pipeline will consist of one manhole and five drainage inlets. The inlets will be collecting a minor amount of runoff
as shown on Exhibit'B'. Due to the minor increase of impervious area (0.75 acres) draining to the existing BMP, a
Plan Revision covered under existing Stormwater Permit No. SW8 050547 is being submitted for this system.
APPHUVED,.A'
0 ��r
NORTH CAROLINA ENVIRONMENTAL JUN 1
MANAGEMENT W v0 03CQI P� BY:
ON
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REMOVED
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THE PROPOSED PROJECT HAS A NET DEDUCTION
OF 14,156 SQUARE FEET (0.33 ACRES) FOR THE
AIRPORT'S MASTER STORM WATER MANAGEMENT
SYSTEM COVERED UNDER PERMIT SW8-040836.
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ABM
Protect No.
3301-1303

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EXISTING STORM 1
PIPE FROM RENTAL �� DIRECTION OF
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B-1 (MANHOLE)
0
B-2 (DROP INLET)
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B-3 (DROP INLET)
9,026 SF (0.21 AC)
B-4 (DROP INLET)
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B-5 (DROP INLET)
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B-6 (DROP INLET)
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IMPERVIOUS AREA
0
4,669 SF (0.11 AC)
5,161 SF (0.12 AC)
2,976 SF (0.07 AC)
13,141 SF (0.30 AC)
6,506 SF (0.15 AC)
TOTAL 68,076 SF (1.57 AC) 32,453 SF (0.75 AC)
ITEM #3
TO EXISTING
SCHEDULE IV
: � ' �r. � •��° �. PLAN SHEETS G10 & G11
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THE PROPOSED PROJECT IS USING 32,453
SQUARE FEET (0.75 ACRES) OF THE PERMITTED
FUTURE BUA ALLOCATED FOR THE AIRPORT'S
MASTER STORM WATER MANAGEMENT SYSTEM
COVERED UNDER PERMIT SW8-050547
DRAINAGE AREA
PER INLET
PER INLET
_ DRAINAGE AREA
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ABM
Pr,o*t No,
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41

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