20001195 Ver 17_Proposed NEAT Basin Monitoring Locations_20220323_final_20220328

Memo
Date: Monday, March 28, 2022
Project: Charlotte Douglas International Airport North End Around Taxiway Project
To: Sue Homewood, North Carolina Department of Environmental Quality — Division of Water
Quality
From: Charlotte Douglas International Airport
Subject: DWR Project No. 20001195 V17 Proposed Monitoring Locations
Dear Ms. Homewood
In 2018, the U.S. Army Corps of Engineers (USACE) requested that Charlotte Douglas
International Airport (CLT) submit a phased Clean Water Act (CWA) Section 404/401 Individual
Permit (IP) application to permit projects proposed for the next five plus years that would
propose impacts to jurisdictional streams and wetlands. HDR prepared and submitted a CWA
Section 404/401 IP application in January 2020 to permit near -term impacts to streams and
wetlands associated with the North End Around Taxiway (NEAT) Project.
The CWA Section 401 Individual Water Quality Certification was approved by the North Carolina
Division of Water resources (NCDWR) on August 21, 2020 (WQC004233) and CWA Section
404 Individual Permit was approved by the U.S. Army Corps of Engineers (USACE) on
December 15, 2020 (USACE Action ID No. SAW-2018-01071). A condition of both the Section
404 and 401 permit approvals was to monitor the proposed in -line regional detention basin on
Ticer Branch for pre- and post -construction baseline conditions and ongoing routine monitoring
after construction is complete. A monitoring plan (dated August 4, 2020) to conduct this work
was approved by the USACE and NCDWR permit approvals as a condition of the permits.
Approval by NCDWR of the proposed monitoring locations is a required condition of the 401
Water Quality Certification. Construction of the NEAT Project commences in June 2022 with Old
Dowd Road construction (part of the NEAT basin) beginning in September 2022.
Basis for Selection of Monitoring Locations
The CLT NEAT Project area is located in the Southern Outer Piedmont ecoregion, which is
characterized by lower topographic elevations, less relief, irregular plains, less precipitation, red,
clayey soils, and more cropland than the Inner Piedmont regions to the east and west (Griffith et
al. 2002). Rosgen type "C" and "E" streams are typical in the Piedmont region (Doll et al. 2003,
SCDNR 2020), which are generally low -gradient, slightly entrenched riffle/pool streams
exhibiting moderate -to -high sinuosity (Rosgen 1996).
Bankfull discharge, the point at which the water begins to overflow the channel onto a
floodplain, is the single most important parameter used in Rosgen Level 11 stream classifications

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Memo
(Rosgen 1996). The stage of bankfull discharge is related to channel dimensions such as width,
width/depth ratio, and entrenchment ratio, which are all metrics used to make Level II Rosgen
classifications. The appropriate location for the determination of bankfull channel widths for type
C and E streams are at riffle locations. Riffles are channel bed features where the greatest
elevation changes occur with water surface and thalweg slopes approximately parallel. The
presence of "deflectors" such as rocks, logs, other debris, nickpoints, or unusual constrictions
that make the stream especially narrow, or that create exceptionally wide backwater conditions
must also be considered and avoided if at all possible.
Induced change in channel stability can be determined by implementing a quantitative,
comparative analysis approach that identifies the differences due to climate, geology, and
morphology from management impacts on streams (Rosgen 1996). A monitoring program which
includes pre- and post -construction monitoring will capture existing (baseline; pre -construction)
conditions of streams subject to detention and the ability to detect any changes post -
construction. Ideally, the post -construction conditions of streams remain the same as the
baseline, pre -construction condition. All monitoring locations will have established baseline
condition for comparison to post -construction condition.
A second element of the monitoring program should also include a comparison of
measurements outside of the area of effect (Rosgen 1996). If a significant storm event or other
natural incident occurs and causes changes in the channel morphology, it is important to be
able to determine the cause of effect (i.e., storm event versus stream management). Therefore,
in order to decipher effects from the NEAT Project versus natural events, monitoring location
S1-04 on Ticer Branch has been located outside of the detention basin grading and flood limits.
Proposed Monitoring Locations
On January 13, 2022, a site visit of the NEAT Project area was conducted by CLT personnel
and HDR Engineering of the Carolinas, Inc. (HDR). The weather was partly cloudy and
approximately 50OF at the time of survey. No significant rainfall events occurred within the week
prior to survey and Mecklenburg County was experiencing moderate drought conditions
following a period of severe drought, therefore flow conditions in the surveyed streams were
relatively low.
The NEAT Project area consists of a forested area with species composition typical of urban
(disturbed) areas, dominated by sweet gum (Liquidambar styraciflua), white oak (Quercus albs),
red oak (Quercus rubra), and Eastern cottonwood (Populus deltoides), with other species
consisting of tulip tree (Liriodendron tulipifera), American sycamore (Platanus occidentalis), and
loblolly pine (Pinus taeda). The understory comprises saplings and shrubs of sweet gum, green
ash (Fraxinus pennsylvanica), American beech (Fagus grandifolia), and red maple (Acer
rubrum), and invasive Chinese privet (Ligustrum sinense) and autumn olive (Elaeagnus
umbellate). The herbaceous layer consists of non-native and nuisance species such as
Japanese stiltgrass (Microstegium vimineum), Japanese honeysuckle (Lonicera japonica), and
poison ivy (Toxicodendron radicans). A maintained sewer line easement bisects the NEAT
Project area.
E

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Memo
Five monitoring locations were identified during the site visit: four along Ticer Branch (S1-01 to
S1-04) and one on Stream 2 (a tributary to Ticer Branch [S2-01 ]) (Figure 1). All sites were
located at stream riffles. A summary of site characteristics and justification is provided in
Table 1. Justifications provided describe reasoning behind the proposed locations based on
potential effects from detention basin flooding or other confounding effects, such as a temporary
stream crossing, stream confluences, debris jams, etc.
Table 1. Proposed Stream Locations for NEAT Project Basin Monitoring
Monitoring Coordinates
Location Numbers
Stream 1 • Within detention basin flood limits
(Ticer Branch) S1-01 35.238210-80.963577 • Upstream of planned temporary Is
stream crossing
Stream 1 • Within detention basin flood limits
(Ticer Branch) S1-02 35.237453-80.965157 • Outside (downstream) of influence 3-4
of S2 confluence
Stream 1 • Within detention basin flood limits
(Ticer Branch) S1-03 35.237266-80.965789 • Outside (downstream) of influence 5-6
of large log jam
Stream 1 • Outside (downstream) of detention
(Ticer Branch) S1-04 35.236790-80.967622 basin flood limits 7-8
• Outside of grading limits
Stream 2 S2-01 35.237179-80.964087 : Upstream of confluence with S1 Within detention basin flood limits 9-10
•
In summary, the proposed stream monitoring locations consist of three locations along Ticer
Branch and one location on Stream 2 to provide sufficient pre- and post -construction monitoring
of stream geomorphology within the bounds of the construction and flood limits. One additional
location is proposed for outside of these limits in order to monitor for confounding effects due to
natural events. As stated above in the Basis for Selection of Monitoring Locations, all monitoring
locations would be established at riffles, as this is the most appropriate location for the
determination of bankfull channel widths for Rosgen C and E type streams. The exact locations
chosen were selected with consideration (avoidance) of deflectors such as rocks, log jams, nick
points, etc. which could potentially affect monitoring results and obscure NEAT Project effects.
HDR, on behalf of CLT, submits this summary of proposed monitoring locations and in
accordance with 401 Water Quality Certification No. WQC004233, requests concurrence and
approval of the proposed monitoring locations as a requirement of the 401 Water Quality
Certification. A site map and photos of the proposed stream locations are attached. Please
contact Jimmy Jordan (Environmental Manager, CLT) or Erin Settevendemio (Senior
Environmental Scientist, HDR) with any questions or concerns.
3

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Memo
Sincerely,
Erin Settevendemio
Project Manager
Attachments
A Site Figure
B Representative Photographs
Eric Rysdon
Aviation Project Manager
0

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
References
References
Doll, B.A., G.L. Grabow, K.R. Hall, J. Halley, W.A. Harman, G.D. Jennings, and D.E. Wise.
2003. Stream Restoration: A Natural Channel Design Handbook. NC Stream Restoration
Institute, NC State University. 128 pp.
Griffith, G., J. Omernik, and J. Comstock. 2002. Ecoregions of North Carolina, Regional
Descriptions. Corvallis, OR.
Rosgen, D. 1996. Applied River Morphology. Wildland Hydrology, Pagosa Springs, CO. 378 pp.
South Carolina Department of Natural Resources (SCDNR). 2020. South Carolina Piedmont,
Ecoregion 45 Stream Morphology Results. Accessed January 2022. [URL]:
https://www.dnr.sc.gov/environmental/docs/piedmontsummarymay2020.pdf.
A

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References
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Charlotte Douglas Internatioanl Airport I NEAT Basin Monitoring Locations
Appendices
Site Figure

Charlotte Douglas Internatioanl Airport I NEAT Basin Monitoring Locations
Appendices
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Charlotte Douglas Internatioanl Airport I NEAT Basin Monitoring Locations
Appendices
Representative
Photographs

Charlotte Douglas Internatioanl Airport I NEAT Basin Monitoring Locations
Appendices
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Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Representative Photographs J
Photograph 1 Monitoring location S1-01 —downstream.
Photograph 2 Monitoring location S1-01 — upstream.

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Representative Photographs J
Photograph 3 Monitoring location S1-02 — downstream.
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Photograph 4 Monitoring location S1-02 — upstream.
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Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Representative Photographs J
Photograph 5 Monitoring location S1-03 — downstream
Photograph 6 Monitoring location S1-03 — upstream

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Representative Photographs J
Photograph 7 Monitoring location S1-04 —downstream
Photograph 8 Monitoring location S1-04 — upstream
rd

Charlotte Douglas International Airport I NEAT Basin Monitoring Locations
Representative Photographs J
Photograph 9 Monitoring location S2-01 (tributary) — downstream.
Photograph 10 Monitoring location S2-01 (tributary) — upstream.

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Representative Photographs
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FN
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