20151229 Ver 1_Stream Monitoring_20200113

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P I L❑ T ENVI R❑ N M E N T A L, 1 N C
ANNUAL STREAM MONITORING REPORT
HAECO FACILITY IMPROVEMENTS PROJECT
IS-8A LOCATION
GREENSBORO, NORTH CAROLINA
PREPARED FOR:
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1000-A TED JOHNSON PARKWAY
GREENSBORO, NORTH CAROLINA 27409
PREPARED BY:
PILOT ENVIRONMENTAL, INC.
PO BOX 128
KERNERSVILLE, NORTH CAROLINA 27285
JANUARY 13, 2020
PILOT PROJECT 2207.1

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P11WU�
PILOT ENVI RONM E N T A L. I N C
January 13, 2020
Ms. Kimberly Turney
North Carolina Department of Environmental Quality
Division of Energy, Mineral and Land Resources —Land Quality Section
450 W. Hanes Mill Road, Suite 200
Winston-Salem, North Carolina 27105
Reference: HAECO Facility Improvements Project
2nd Annual Stream Monitoring Report
Piedmont Triad International Airport
Greensboro, North Carolina
Pilot Project 2207.1
Dear Ms. Turney:
Pilot Environmental, Inc. (Pilot), on behalf of Piedmont Triad Airport Authority (PTAA), has
completed the post -construction annual stream monitoring report for the unnamed tributary to
Horsepen Creek located downstream of the HAECO project. The monitoring was completed in
accordance with the Monitoring Plan prepared by WK Dickson dated August 30, 2016 and the Letter
of Approval with Modifications, prepared by the North Carolina Division of Energy, Mineral and Land
Resources — Land Quality Section, dated August 31, 2016. The findings from the monitoring events
are enclosed.
If you have questions concerning this report or need additional information, please contact us at
[phone].
Sincerely,
go
David S. Brame, PWS
Senior Project Manager
cc: Mr. Chuck Kirchner, NCDEQ-DEMLR
Ms. Sue Homewood, NCDEQ-DWR
Mr. Alex Rosser, PTAA
Mr. Richard Darling, Michael Baker International
B. J. Linebac , CIEC, LEED AP
Vice President
PO Box 128, Kernersville, NC 27285
www.pilotenviro.com

Annual Stream Monitoring Report
Pilot Project 2207.1
January 13, 2020
Background
In accordance with the 401 Water Quality Certification and the HAECO National Pollutant
Discharge Elimination System (NPDES) Construction Stormwater General Permit NCG0100000 for
the onsite development of the HAECO Facility Improvements Project, visual and analytical
monitoring is required for the unnamed tributary to Horsepen Creek located downstream of the
project. The specific requirements as outlined by the 401 Water Quality Certification and the
HAECO NPDES Construction Stormwater General Permit NCG0100000 and subsequent
Monitoring Plan are summarized below. If monitoring results indicate that the tributary is
unstable, then the Piedmont Triad Airport Authority (PTAA) shall conduct an analysis of the cause
and propose a resolution to the North Carolina Department of Environmental Quality (NCDEQ)
Division.
401 Water Quality Certification Conditions
Conditions 5, 6, and 7 of the 401 Water Quality Certification (included below) shall be followed
for up to seven years following construction to satisfy monitoring requirements. However, if after
three years of monitoring or two documented bankfull events, whichever occurs first, the site
demonstrates that there are no significant stream stability concerns, then the monitoring of the
site will be terminated.
5. In -stream analytical monitoring shall be performed at stream site ISBA as specified in
the most recent version of NCS00050B issued to the PTAA by the Division of Energy,
Mineral and Land Resources (DEMLR) and correspondence between the PTAA and DEMLR
on March 10, 2016. If monitoring results at ISBA indicate exceedances of Turbidity
benchmark values as identified in NCS00050B, the Division WSRO shall be notified in
writing.
6. Visual monitoring of the unnamed tributary shall be conducted at location ISBA. Pictures
shall be taken of the upstream and downstream bank conditions during each monitoring
event. If visual monitoring indicates that banks of the tributary are exhibiting erosion, the
Division WSRO shall be notified in writing.
7. If monitoring conducted pursuant to Condition #5 or #6 above indicate that the
unnamed tributary is unstable or that the banks of the tributary are unstable, then the
Permittee shall conduct a detailed analysis of the cause and propose a resolution to the
Division WSRO. Upon approval by the Division WSRO, the Permittee shall implement the
resolution accordingly.

Annual Stream Monitoring Report
Pilot Project 2207.1
January 13, 2020
HAECO NPDES Construction Stormwater General Permit NCGO100000
A stream monitoring and maintenance plan is required for the section of stream located below
the existing 114" CMP leading to Horsepen Creek. The plan requires that all monitoring
parameters and frequency be followed. Two permanent cross sections have been established
and are monitored quarterly. In addition, bank pins have been installed in several locations along
the outer bends of meanders. Baseline stream monitoring was conducted prior to diverting
water into the new culvert systems, located upstream of Structure #1. In accordance with the
permit, a repair/stabilization plan shall be submitted for approval if repairs become necessary to
adequately stabilize the stream. Based on the results of the stream monitoring, a
repair/stabilization plan has not been submitted at this time and is not proposed.
Monitoring Observations
Pilot completed the second year of stream monitoring in accordance with the Monitoring Plan
prepared by WK Dickson for the unnamed tributary to Horsepen Creek located downstream of
the HAECO Facility Improvements Project at the Piedmont Triad International Airport in
Greensboro, North Carolina. The approximate location of the stream and monitoring location is
depicted on the attached USGS Topographic Map (Drawing 1). During the 2019 monitoring
period, Pilot conducted quarterly visual monitoring of the stream, surveying of two fixed cross
sections along the stream, inspection of bank pins and crest gauge, and preparation of this annual
monitoring report. The annual results of our findings and supporting data, including monitoring
cross section profiles, monitoring observation spreadsheet, and photographs are attached.
Visual Monitoring
Visual monitoring of the project channel was conducted quarterly. Visual assessments of stream
stability included a complete stream walk and channel inspection. Digital images were taken at
fixed representative locations to note any problem areas or areas of concern. Based on the visual
monitoring conducted, notable channel aegradation and degradation and bank erosion were not
observed. It should be noted that visual evidence of erosion is apparent along the stream banks.
However, similar conditions were evident prior to completion of the upgradient HAECO project.
The erosion does not appear to be exacerbating. Visually turbid conditions were observed during
the third quarter monitoring event. Pilot evaluated the adjacent Horsepen Creek and other
nearby streams located upgradient of the project drainage area for comparison. These streams
were observed to be equally turbid and therefore, conditions are likely attributable to heavy
rainfall that occurred prior to monitoring. Digital images compiled during the four quarterly
monitoring events are included as attachments.

Annual Stream Monitoring Report
Pilot Project 2207.1
January 13, 2020
Cross Sections
Two permanent cross sections were installed along the project channel as indicated in the
Monitoring Plan. The cross sections were surveyed during the quarterly monitoring events. Based
on the results of the quarterly cross section surveys, we did not identify significant changes that
could indicate a change in bank stability for Cross Section 1 or Cross Section 2. The results of the
quarterly survey events are depicted on Drawing 2.
Bank Pin Arrays
Bank pin arrays are used as a supplemental method to monitor erosion on selected meander
bends and other locations where there is not a cross section. Bank pin arrays were installed along
the outer bends of the meanders. Bank pins were installed just above the water surface and every
1.5 to two feet above the lowest pin. Bank pin exposure was recorded at each monitoring event,
and the exposed pins were driven flush with the bank. Based on the quarterly monitoring of the
bank pin arrays, significant changes that could indicate a change in bank stability were not
identified. The results of the quarterly survey events are included as an attachment.
Crest Gauge
The crest gauge was checked during each monitoring event. The stage recorded by the crest
gauge was measured and logged. If any debris lines or watermarks were observed, photos were
taken to document the features. There were no readings recorded by the crest gauge nor
watermarks or debris wrack lines observed during the quarterly monitoring events.
Conclusions and Opinions
Based on our findings during the quarterly monitoring events conducted for the unnamed
tributary to Horsepen Creek, we did not identify significant changes to the stream as measured
by the applicable parameters that could indicate a change in stability. It is our opinion that
responsive action to changes in bank stability is not warranted at this time and that stream
monitoring should be continued in accordance with the 401 Water Quality Certification, the
HAECO NPDES Construction Stormwater General Permit NCGO100000 and subsequent
Monitoring Plan.
Attachments: Drawing 1— USGS Topographic Map
Drawing 2 — Wetland Map (including Monitoring Cross Section Profiles)
Monitoring Observation Spreadsheet
Photographs

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Drawing
USG3Topographic Map
Guilford, NC Quadrangle
Scale: 1"=2,000Y
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4.40
LEGEND
Site Boundary
USGSTopographic Map
HAECOFacility Improvements Project
' Post Construction Stream Monitoring
��Nmm���Piedmont Triad International Airport
� �-m~~ ��~�-~.-�. �
"'`"` "°, ROHN' E IL. I A IL. I N C Greensboro, Guilford County, NC
Pilot Project 2ZO7.l

Legend
® Crest Gauge
p Bank Pins
Culvert/Apron
Cross Section 1
Cross Section 2
Stream
825
c
0
ca
820
N
W
815
0.00
5.00
I`'
a
Cross Section 1 Profile
Post Construction
Year 1 Post Construction (2018)
Year 2 Post Construction (2019)
10.00 15.00 20.00 25.00 30.00 35.00
Station (Ft)
Cross Section 2 Profile
825 —
+.7
c
0
m 820 --
Post Construction
N — Year 1 Post Construction (2018)
W
Year 2 Post Construction (2019)
815
0.00 5.00 10.00 15.00 20.00 25.00 30.00
Station (Ft)
Drawing 2 Wetland Map
HAECO Facility Improvements Project
Aerial Imagery from ESRI
and Pilot Field Notes
��. Post Construction Stream Monitoring
- - _ y - ___
Scale: 1" = 50' p���� piedmont Triad International Airport
Date: 11.25.19 C 1 E N V I R 0 N M E N T A t. A N C Greensboro, Guilford County, NC
Pilot Project 2207.1

HAECO Facility Improvements Project
Stream Monitoring Data History - Post Construction
See Monitoring Plan 8/31/2016 for monitoring requirements
Bank Pins Array, Observed erosion reported in inches
Visual Monitoring
Notable observations
Cross Sections
Notable Observations
Crest Gauge
Recorded Stage Measurement
Date
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Q1
1.24.18
0
1
0
0
0
No observed issues
No observed issues
No reading
Q2
4.27.18
0
1.5
1
0
1.5
No observed issues
No observed issues
No reading
Q3
7.12.18
0
1
0
1.5
0
No observed issues
No observed issues
No reading
Q4
111.26.18
0
2
2
2
0
No observed issues
No observed issues
No reading
Q1
2.7.19
0
0
0
0
0
No observed issues
No observed issues
No reading
Q2
4.23.19
0
0.5
0
0
0
No observed issues
No observed issues
No reading
Q3
7.31.19
0
0
1
3
0
No observed issues
No observed issues
No reading
Q4
11.19.19
1 01
01
0.51
31
01
No observed issues
No observed issues
No reading

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