20001195 Ver 15_More Info Received_20150911

From:
To:
Alan,
Benton, Charles <chades.benton@aecomzom>
Friday, September ll'ZUl54:UlPK4
Johnson, Alan
8urdette, Jennifer a;[rystai[^Amsch|[e-mail]|
RE: Traffic Control Tower
AE[OK4 Letter to N[DVVR [LTAT[T 0'11'15.pdf
Please find attached a letter and supporting figure with the information you requested. Essentially, we've presented
several security constraints that prevent further reconfiguration of the site layout. We've also noted some additional site
constraints that were considered during the design of this facility.
I will send a hard copy as well. I have an electronic copy of the Airport Layout Plan, but the most I can reduce the size to is
17MB. Please let me know if you are able to receive a file this size via email.
Please let me know if you have any questions regarding this information.
Charlie Benton.PWG
Natural Environment Lead I Senior Project Manager
D 1-919-461-1435 C 1-919-946-3122
16-0-0- Perimeter Park Drive Suite 400
AECOM and URS have joined together as one company. Learn more.
From: Johnson, Alan [mai Ito: kanjohnson@ncdenr.00v]
Sent: Tuesday, September O8, 2015 11:08 AM
To: Benton, Charles
Subject: Traffic Control Tower
Any luck on obtaining the information we discussed at the site on September 2
Thanks
a/an
Alan O Johnson — Senior Environmental Specialist
N[ Dept. ofEnvironment & Natural Resources UNCOEN0
Division of Water Resources - Water Quality Regional Operations

61O East Center Ave, Suite ]O1,Mooresville, NC 28115
E-mail Phone: [phone] Fax: [phone]
correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulation.

AXOM
September 11, 2015
AECOM
1600 Perimeter Park Drive
Suite 400
Morrisville, INC 27560
www.aecom.com
Alan Johnson
Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Re: CLT ATCT project
Mecklenburg County, North Carolina
Dear Mr. Johnson:
919 461 1100 tel
919 461 1415 fax
Thank you for meeting with us on Wednesday, September 2, 2015 to discuss the Charlotte
Douglas Airport (CLT) Airport Traffic Control Tower (ATCT) project. Per our discussion, we
are including in this letter additional information that further discusses the proposed layout of
the ATCT and its associated facilities as it relates to the unavoidable impacts to the on -site
ephemeral and intermittent stream channels. We have also enclosed a figure entitled "CLT
ATCT Site Conditions and Controls Exhibit" that depicts the existing and future site
constraints to aid this discussion.
Please call me at (919) 461 -1435 if you should have any questions regarding this
information.
Very truly yours,
AECOM /URS
a4-ai '� '\ ,
Charles Benton, PWS
Project Manager /Senior Environmental Scientist
Enclosures
cc: Ms. Courtney J. Nolan, FAA
Mr. Chris Petterson, AECOM /URS
Mr. Charles Voorhees, AECOM /URS
Ms. Crystal C. Amschler, USACE
Ms. Jennifer Burdette, NCDWR

AECOM
Mr. Alan Johnson
September 11, 2015
Page 2
Federal Aviation Administration — Charlotte Douglas International Airport Air Traffic
Control Tower Facility Siting Conditions and Constraints that require the unavoidable
impacts to Waters of the U.S.
Avoidance and minimization
As part of the original permit submittal, we included the following information within the
Supporting Documentation:
4.2.1 kvoidance and Minimization
As indicated in the alternative analysis, the site options for the proposed ATCT are limited.
Specific to the preferred alternative Site 2B (the proposed project) an evaluation was made to
attempt to avoid impacts to an intermittent stream. However, the area north of the on -site
intermittent stream is not viable due to the proximity of existing airport facilities and Hanger
Road. The area south of the intermittent stream is not viable due to limited site visibility and
the existing overhead utility line easement. Within the Site 2B area, the site plan was
developed to minimize impacts to wetlands and streams to the greatest extent practicable.
Specific minimization measures include:
• Utilized open areas of the site to locate a dry detention pond (Pond #2) instead of
enlarging the Pond #1 where more stream impacts would be likely.
• Coordinated with the Airport Drainage Master Plan so that site runoff treatment
(required under the Charlotte PCCO) could be handled by another airport facility.
Again, this minimized the size of the detention ponds.
• Shifted Pond #1 closer to the main site so as to reduce stream impacts (reducing
the stream impacts by about 50 feet) subsequent to submitting the permit application.
Construction activities would be conducted in accordance with local, state, and federal
regulations, as well as best management practices (BMPs), including the NCDENR Manual
of Stormwater Best Management Practices, the North Carolina Erosion and Sediment Control
Planning and Design Manual, and the Design Standards in Sensitive Watersheds (15A
NCAC 04B.0124). Construction staging areas would be located away from wetlands, and
preserved wetland areas would be demarcated prior to construction. All work in or adjacent to
stream waters would be conducted so that the flowing stream does not come in contact with
the disturbed area.
During the site visit on September 2, 2015, Mr. Alan Johnson of the NC Division of Water
Resources ( NCDWR) requested some additional information to further understand 1) why
the proposed facility and associated parking could not be located to the adjacent property to
the east of the proposed site location, or 2) why the proposed parking lot and stormwater
basin could not be reconfigured to extend further south of the proposed Terminal Radar
Approach Control (TRACON) base building. Mr. Johnson suggested that either of these
options would allow for the avoidance and minimization of impacts to the existing ephemeral
and intermittent stream channels located in the western portion of the proposed site.

AECOM
Mr. Alan Johnson
September 11, 2015
Page 3
Adiacent Eastern Propertv
The eastern property adjacent to the proposed site location is not an option for any portion
of the ATCT facility. The primary reasons are:
1. This Future Airport Structure (Project Number 2018.20) and its associated parking
area are to be built east of FAA proposed site location and east of the Duke Energy
overhead transmission line easement and will encompass the upland area east of
the FAA site (see enclosed CLT ATCT Site Conditions and Controls Exhibit). This
project has been indicated on the FAA Airport Location Plan (ALP), to be approved
later this year. A copy of the preliminary ALP is enclosed.
2. The Duke Energy overhead transmission line is contained within a 30 foot easement
which cannot be crossed with another property line. FAA security requirements
mandate a fully fenced access - controlled perimeter with leased property rights solely
to FAA. As such, no portion of the proposed ATCT facility can be situated within the
transmission line easement.
Reconfiguration of the Stormwater Basin and Parking Lot
As discussed in the original application, and restated above, the stormwater basin was
reconfigured during the preliminary design to minimize stream impacts. Additional
reconfigurations of the stormwater basin and parking lot are not feasible because of security
reasons, as well as existing site constraints.
Guard Booth Security Constraints:
Reconfiguration of the parking lot to the south or east of the proposed facility is not feasible
due to the security guard booth line of sight constraints. The guard booth is fixed at the
driveway entry point in the northern portion of the proposed site location (see enclosed CLT
ATCT Site Conditions and Controls Exhibit). The FAA driveway entry point cannot be
located on a roadway curve, per FAA criteria. The security personnel require a direct line of
sight from the guard booth to the visitor parking spaces within the secure area. Visitor
parking spaces within the secure area are required to be as far from the TRACON base
building as possible within the guard booth line of sight constraints. Moving the parking area
further to the south or east would prevent the security personnel from being able to view the
furthest parking spaces.
Additional security layout constraints implemented in the design of this facility are as follows:
• As stated above, FAA security requirements mandate a fully fenced access-
controlled perimeter.

AECOM
Mr. Alan Johnson
September 11, 2015
Page 4
• Security regulations for this facility (FAA Order 1600.69B) also require a 20 -foot clear
area on either side of the fence line. The FAA lease boundary must contain the outer
20 -foot clear area as well as any maintenance areas.
• Security regulations for this facility require 100 feet from any point on the structure to
the nearest parking space or property line.
• The TRACON base building is required be situated greater than or equal to 100 feet
from the transmission lines and 100 feet to the tree line adjacent to Hangar Road.
• The cab of the Control Tower was located 50 feet from the transmission lines to
provide separation, per the AFTIL Siting Report.
Future 4t" Runway Security Constraints
A new 4t" parallel runway and taxiways will encroach across Coffey Creek, to the south of
the proposed FAA site location. These features have been indicated on the FAA Airport
Location Plan (ALP), to be approved later this year (see CLT ATCT Site Conditions and
Controls Exhibit). The security area for the new runway and taxiways will be expanded to
the east and north away from the existing security fence location and towards the Duke
Energy easement and the FAA site. The future runway security area restricts the proposed
site location from being shifted further to the south.
Other Existing Site Constraints:
In addition to the security layout constraints, several other features restrict the
reconfiguration of the parking lot and the stormwater basin to the south or east of the facility.
These features are depicted on the enclosed CLT ATCT Site Conditions and Controls
Exhibit.
1. As discussed in the both the NEPA Environmental Assessment and the permit
application, the Duke Energy overhead transmission line easement, as well as a
potential hazardous waste debris area were cited as reasons that restricted the
proposed FAA lease site location area.
2. Coffey Creek bounds the west side of the site. There is an existing 100 -foot Surface
Water Improvement and Management (S.W.I.M.) Buffer on each side of the Creek as
well as the Floodplain Boundary, which varies in distance from the centerline of
creek. This area cannot be developed upon.
3. There is an intermittent stream located directly to the south of the proposed site
location (see photographs , below). This stream originates from a headcut near an
area labeled as non - jurisdictional wetland on the CLT ATCT Site Conditions and
Controls Exhibit. This

AZ-COM
Mr. Alan Johnson
September 11, 2015
Page 5
area was delineated as a potential wetland during the wetland delineation, because it
contained indicators that suggested the area was inundated or saturated for some
duration. However, this area did not meet the vegetation criteria to being considered
a wetland, and US Army Corps of Engineers did not take jurisdiction of this area. The
stream's headcut was located outside of the proposed site location and was not
considered during the jurisdictional determination.
Reconfiguring the parking lot or stormwater basin to the south would impact this
stream to a similar extent as the proposed impacts to the other stream located within
the proposed site location.
Photoaraphs of stream located to south of the proposed FAA site location.
5
71

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n 400 Northpark Town Center,1000 Abernathy Road, NE. / o Y Y u
Suite 900 Atlanta, Georgia 30328 L --j
Tel. No (678)808 -8800 Fax. [phone] APPROVED REDLINE
REV DATE DESCRIPTION JCN DATE APVD
DISCIPLINE: CIVIL B
DEPARTMENT OF TRANSPORTATION
NAME : CHRIS M. PETTERSON, PE FEDERAL AVIATION ADMINISTRATION
NORTH CAROLINA REG. #: 36025
SIGNATURE: p
DATE: T OWB
URS mint m CLT ATCT SITE CONDITIONS AND CONTROLS EXHIBIT
15290056 PREPARED FOR NCDENR DWO
CHARLOTTE CHARLOTTE DOUGLAS INTERNATIONAL AIRPORT (CLT) NC
REVIEWED BY SUBMITTED BY APPROVED BY
A
x 100' 0 100' 200'
1" - 100' — 0" DESIGNED ISSUED BY DATE IJCN
- -- 9/9/2015 1103700
�j DRAWN DRAWING NO REV
Copyright © 2013 URS Corporation, All Rights Reserved CHECKED
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SCALES SHOWN FOR 22" X 34" SHEET. ADJUST SCALES FOR OTHER SIZES. PAGE 1 OF 1
1
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n 400 Northpark Town Center,1000 Abernathy Road, NE. / o Y Y u
Suite 900 Atlanta, Georgia 30328 L --j
Tel. No (678)808 -8800 Fax. [phone] APPROVED REDLINE
REV DATE DESCRIPTION JCN DATE APVD
DISCIPLINE: CIVIL B
DEPARTMENT OF TRANSPORTATION
NAME : CHRIS M. PETTERSON, PE FEDERAL AVIATION ADMINISTRATION
NORTH CAROLINA REG. #: 36025
SIGNATURE: p
DATE: T OWB
URS mint m CLT ATCT SITE CONDITIONS AND CONTROLS EXHIBIT
15290056 PREPARED FOR NCDENR DWO
CHARLOTTE CHARLOTTE DOUGLAS INTERNATIONAL AIRPORT (CLT) NC
REVIEWED BY SUBMITTED BY APPROVED BY
A
x 100' 0 100' 200'
1" - 100' — 0" DESIGNED ISSUED BY DATE IJCN
- -- 9/9/2015 1103700
�j DRAWN DRAWING NO REV
Copyright © 2013 URS Corporation, All Rights Reserved CHECKED
3 I 2 I 1