20131200 Ver 6_Year 2 Monitoring Report -12312021_20220104

Tryon International Equestrian Center
2021 Monitoring Year 2 Report
Polk County, North Carolina
DWR# 20131200 v6
Data collected:
November 2021
Submitted on:
December 31, 2021
Prepared for: Prepared by:
2659 Sandy Plains Road
Tryon, NC 28782
CLearWaLer
An EnviroScience Company.
An EnviroScience Company
145 7th Avenue W; Suite B,
Hendersonville, NC 28792

Introduction
The Tryon International Equestrian Center (Site) is located at the intersection of Pea Ridge Road
and US Highway 74 northeast of Tryon in Polk County, North Carolina (Figures 1 and 2).
A permit modification request (DWR 401 Water Quality Certification DWR#20131200 v6) resulted
in a request for additional information in a letter dated August 27, 2018 and a Notification of
Violation (NOV) issued March 29, 2018 (NOV-2018-WP-0002) sent by the NC Division of Water
Resources. In order to satisfy the conditions of the permit modification and resolve the NOV,
ClearWater Environmental, an EnviroScience Company (ClearWater) is conducting monitoring of
a 200 ft stream reach adjacent to a 20 ft stream repair section. Odom Engineering PLLC (Odom)
designed the repairs, which included streambank stabilization at a 60" RCP stormwater outlet,
rock toe and slope stabilization with riparian seed mixture, and coir fabric placed on graded
slopes. The purpose of monitoring is to ensure that the site continues to remain geomorphically
stable following the repairs. This report serves as the second annual monitoring report (MY2) of
three years of post -construction monitoring.
Construction of the initial repairs were complete in the fall of 2019, and an as built geomorphic
survey was performed on November 22, 2019.
Following the As -Built survey, additional matting and live stakes were installed on April 30, 2020.
In January 2021 additional stabilization measures were installed along the stream banks and
below the 60" RCP stormwater outlet. A rock toe was installed along the inside meander bend of
the stream bank, opposite of the stormwater outlet. The inside meander bend was regraded and
stabilized with seed, straw, and matting. Additional energy dissipation measures were installed
on the stream bank between the existing plunge pool and the stream edge. Erosion control wattles
were installed along the stream side to prevent excess sediment entering the stream from the
most recent work areas. Due to the installation of additional measures, geomorphic and
photographic data collected in the fall of 2020 was not used for MY1. The bank stabilization work
completed after the As -Built survey destroyed the original cross section pins and PVC
monuments. The cross sections pins were reestablished, to the best of our ability, in the same
locations as they were in the baseline survey. A survey was completed in July 2021 and submitted
as MY1. Comparing existing conditions to the As -Built survey is a poor reference due to the
additional stabilization work and resetting of cross section monuments; therefore, MY1 will serve
as a new baseline moving forward.
This annual monitoring report (MY2) documents the geomorphic condition of the channel adjacent
to the stabilization efforts. Monitoring components include: geomorphic survey of stream
dimension (cross sections) a longitudinal profile, and photographic reference points (photo -points)
to visually document stream conditions. Please refer to Figure 3 for the location of monitoring
features.
Tryon International Equestrian Center
Monitoring Year 2 Report for repairs to UT to White Oak Creek
December 2021
page i

Table of Contents
Introduction i
Monitoring project success criteria 1
Methods 2
Geomorphic Surveys 2
Photographic Documentation 2
Results 3
Photographic Documentation Results 3
Geomorphic Monitoring 17
Conclusions 19
References 20
Attachment A
• Longitudinal Profile Survey Visualization and Parameters
• Cross -Sections 1-4 Survey Visualization and Parameters for MY1 and MY2
Tryon International Equestrian Center
Monitoring Year 2 Report for repairs to UT to White Oak Creek
December 2021
page ii

Monitoring Project Success Criteria
The project success criteria is evaluated using Photo documentation, and Channel stability
measurements that meet published guidelines for geomorphic assessment under section VI of
the 2016 USACE Wilmington District Wetland Compensatory Mitigation Update. If the repairs
remain geomorphically stable through years one through three, the permit condition will be
considered fulfilled.
Channel Stability (Cross -sections, Longitudinal Profile Surveys): Minimal evidence of
instability (downcutting, deposition, bank erosion, or an increase in fine substrates). Determination
of success should indicate that there is no significant change from the As -Built dimension and
longitudinal profile and should determine that any measurable changes are moving in a direction
of stability rather than instability.
Photo Documentation: Visual assessment should indicate no substation aggradation,
degradation or bank erosion, should demonstrate success of planted riparian vegetation (riparian
seeding and live stakes), effectiveness of erosion control measures, and the absence of
developing instream bars.
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 1 of 10

Methods
Geomorphic Surveys
Stream surveys follow the methodology contained in the USDA forest service manual "Stream
Channel Reference Sites (Harrelson, et al 1994). Both cross-section and longitudinal profile
surveys were conducted on November 2, 2021. All monitoring locations are monumented with
capped rebar and a PVC stake. The additional construction in 2020 resulted in cross section pins
and monuments being reset. New monuments were placed, to the best of our abilities, in the
same location as those in the 2019 As -Built monitoring.
Geomorphic surveys were performed using a laser level, and laser sensor attached to stadia rod,
and measuring tape. Permanent cross sections were established at four locations within the 200
ft reach to represent two riffles, one run and one pool. Cross section locations were established
according to best professional judgement. Cross section data points were collected at all major
changes in slope, including top of bank, bankfull, water surface and channel thalweg locations.
A longitudinal survey was performed with data points collected at major changes in slope,
including at the water surface and channel thalweg, head and tail of riffles, max pool depth and
at bankfull or top of bank locations. Stream channel cross section dimensions and longitudinal
profile slopes were calculated using "The Reference Reach Spreadsheet" version 4.3 L developed
by Dan Mecklenburg. (Ohio Department of Natural Resources). A longitudinal survey will only be
repeated during annual monitoring if visual assessment indicates significant incision or
aggradation within the streambed.
Photographic Documentation
Photographic reference points (photo -points) were used to visually document stream conditions
and included both a downstream facing photo and an upstream facing photo at each photo
reference point. Photo -points were established at six (6) stations along the length of the 200 ft
stream reach. The photographer will make a reasonable attempt to capture the same perspective
in each photo -point location annually.
Figure 3 includes the locations for all monitoring features.
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 2 of 10

Results
Photographic Documentation Results
Visual assessment was performed at the time of the MY1 Survey on July 2, 2021, as well as
during the MY2 Geomorphic Survey on November 2, 2021. The visual assessment photos of MY1
and MY2 are included below for comparison. Photographs of the additional stabilization measures
installed January 2021 and the current conditions of the live stakes installed April of 2020 are
included in the subsequent section.
Photo Points
`•sog
Z•
-
•
ly.
;, Fes• [�^
4 •4
. • . .. e .-'� '
., O'710212?02
•o. ,�
b o f
Photo Point 1 Upstream: MY1 (7/2/2021)
!..
:
_
.:> - :
,� •
.r7• • • .... -r! Y..
go
..,. , g�t..wsy 1- . •• 4', may,. -
- ' .'•;�.ra .^P'.`' ;;�-.-�. tin -."wf •.... •.: },;
.. '' fir. •:.pe,.• •y.asP�:
_ �- ' ..: '.-" -rJ�lL L. L
..� • �:�• y. yam.
> . .
�.>
Photo Point 1 Upstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 3 of 10

Photo Point 1 Downstream: MY1 (7/2/2021)
Photo Point 1 Downstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 4 of 10

Photo Point 2 Upstream: MY1 (7/2/2021)
Photo Point 2 Upstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 5 of 10

Photo Point 2 Downstream: MY1 (7/2/2021)
Photo Point 2 Downstream: MY2 (12/30/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 6 of 10

Photo Point 3 Upstream: MY1 (7/2/2021)
Photo Point 3 Upstream: MY2 (12/30/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 7 of 10

Photo Point 3 Downstream: MY1 (7/2/2021)
Photo Point 3 Downstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 8 of 10

Photo Point 4 Upstream: MY1 (7/2/2021)
11/02/20.2.1 14'13
Photo Point4 Upstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 9 of 10

Photo Point 4 Downstream: MY1 (7/2/2021)
Photo Point 4 Downstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 10 of 10

Photo Point 5 Upstream: MY1 (7/2/2021)
Photo Point 5 Upstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 11 of 10

Photo Point 5 Downstream: MY1 (7/2/2021)
Photo Point 5 Downstream: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 12 of 10

Photo Point 6 Facing Stormwater Outlet Pipe: MY1 (7/2/2021)
Photo Point 6 Facing Stormwater Outlet Pipe: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 13 of 10

Photo Point 6 Facing Stormwater confluence with UT to White Oak Creek: MY1 (7/2/2021)
Photo Point 6 Facing Stormwater confluence with UT to White Oak Creek: MY2 (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 14 of 10

Additional streambank stabilization below the stormwater outlet and on the inside mend bend
were installed in January 2021. Photographic documentation of the installed measures is
presented below:
Overview of additional stabilization measures
(1/20/2021)
Rock toe on inner bend, opposite of
stormwater outlet (1/20/2021)
Inner meander bend seed and matting
(1/20/2021)
Concrete block step structure installed below
60" RCP stormwater outlet (1/20/2021)
Live stakes planted April 2020 on the outside meander bend have had a low rate of establishment.
ClearWater recommends the installation of additional live stakes during the dormant season
(December -March). Between MY1 and MY2 several riprap boulders washed into the stream bed
on the outside meander bend in the vicinity of the concrete block step structure. The riprap stone
was removed from the stream channel in order to prevent an unintentional change to the stream
profile. Photos of the outside meander bend live stakes are included below:
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 15 of 10

Live stake installation on outside meander bend (4/30/2020)
MY2 live stake survival is low and should be supplemented (12/30/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 16 of 10

Geomorphic Monitoring
Four cross section surveys were performed during the November 2021 MY2 site visit. The
geomorphic assessment was compared to MY1 data taken July 2021. Cross section comparison
graphs and the longitudinal profile are included in Attachment A.
The right pin of Cross Section 1 (XS1) was missing during the MY2 assessment. This area
appeared to have been rematted since the MY1 site visit. The cross section pin was reestablished
as close as possible to the same locations as the baseline survey. The MY2 survey of XS1
resulted in a similar profile to the one surveyed during MY1. Minor changes to the bank profile are
possibly the result of replacing the original right pin. XS2 had additional stabilization work
completed on the right bank since the MY1 survey. Slight aggradation (a few inches) was noted
to the stream bed at XS2. This will be an area of interest during annual year 3 monitoring (MY3).
XS3 and XS4 show very little change across the entire cross section. XS4 showed some very
minor downcutting along the thalweg during MY1. This downcutting is not apparent during the
MY2 survey and appears stable.
The table below summarizes Geomorphic Data for the monitoring record:
Bankfull Dimensions
XS1
XS2
XS3
XS4
Riffle
Run
Pool
Riffle
Jul-21
Nov-21
Jul-21
Nov-21
Jul-21
Nov-21
Jul-21
Nov-21
x-section area (ft.sq.)
14.4
12.7
26.5
21.0
30.5
24.9
31.9
31.2
width (ft)
8.5
9.4
19.8
15.8
18.8
17.7
26.4
26.2
mean depth (ft)
1.7
1.4
1.3
1.3
1.6
1.4
1.2
1.2
max depth (ft)
2.6
2.5
2.5
2.7
3.5
3.0
3.0
3.0
wetted parimeter (ft)
11.3
12.5
22.9
19.3
21.7
20.5
27.8
28.1
hyd radi (ft)
1.3
1.0
1.2
1.1
1.4
1.2
1.1
1.1
width -depth ratio
5.0
6.9
14.8
12.0
11.6
12.5
21.8
22.0
In addition, photographic documentation of geomorphic cross sections are included below:
Cross Section Photographs
Cross Section 1 Facing Downstream (11/2/2021)
Cross Section 1 Facing Upstream (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 17 of 10

Cross Section 2 Facing Downstream (12/30/2021)
Cross Section 3 Facing Downstream (11/2/2021)
Cross Section 4 Facing Downstream (11/2/2021)
130l20P1 13'23
Cross Section 2 Facing Upstream (12/30/2021)
Cross Section 3 Facing Upstream (11/2/2021)
Cross Section 4 Facing Upstream (11/2/2021)
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 18 of 10

Conclusions
The overall geomorphic condition of UT to White Oak Creek appears to be stable within most of
the project area. XS2 and the area around the concreate block stormwater outlet will continue to
be an area of interest during MY3. Minor amounts of riprap mobilization was observed below the
stormwater outlet structure and has been removed from the channel. Additional live stake planting
is recommending along the outside meander bend below the stormwater outlet.
As riparian vegetation continues to become established around the recently installed measures,
it is expected that the stream will reach a new equilibrium and geomorphic conditions will move
toward increased stability. MY2 indicates that the site generally meets performance standards.
ClearWater will conduct the MY3 during the summer of 2022 and send the report to DWR for
review.
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 19 of 10

References
Harrelson, Cheryl C; C. L Rawlins; J.P. Potyondy. 1994. Stream channel reference sites: an
illustrated guide to field technique. Gen. Tech. Rep. RM-245. Fort Collins, CO: U.S.
Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment
Station. 61 p.
Dan Mecklenburg & Ohio Department of Natural Resources. Copyright 2006. "The Reference
Reach Spreadsheet" version 4.3 L
Tryon International Equestrian Center
Monitoring Year 2 for repairs to UT to White Oak Creek
December 2021
page 20 of 10

TIEC - UT to White Oak Creek Monitoring
tr
Se"
F Mgnlo�iRK
Legend
Monitoring Reach
TIEC Boundary
Drawn by: AKT Date; 5.18.2020 CEC Project #747
Lei yen L.,
4k
Cam*
41‘
Polk County,
North Carolina
CLearWater
An EnviroScience Company
145 7th Avenue West, Suite B
Hendersonville, NC 28792
Vicinity
Figure 1

TIEC - UT to White Oak Creek Monitoring
'whist do .".
1
AKT Date; 5.18.2020 CEC Project #747
/
Polk County,
North Carolina
CLearWater
An EnviroScience Company
145 7th Avenue West, Suite B
Hendersonville, NC 28792
USGS Topographic Map
Pea Ridge Quad
Figure 2

TIEC - UT to White Oak Creek Monitoring
1
Stormwater
Outlet
1
Photo Point 6
Photo Point 5
Legend
- Monitoring Reach
- Stormwater Infrastructure
1_ TIEC Boundary
+ Photo Points
Cross -sections
Drawn by: AKT Date; 5.18.2020 CEC Project #747
Aim
+
•
Longitudinal
Profile Reach
1Photo Point i
Photo Point 2
IllPhoto Point 3
Photo Point 4
NC OneMap, NC Center for Geographic Information and Analysis, NC 911 Board
A
Polk County,
North Carolina
CLearWater
An EnviroScience Company
145 7th Avenue West, Suite B
Hendersonville, NC 28792
Monitoring Features Map
Figure 3

Elevation (Feet Above MSL (Approx.))
Attachment A
Cross Section Comparison Plots
842.5
842
841.5
841
840.5
840
839.5
839
838.5
838
837.5
TIEC - Repairs to UT to White Oak Creek
MY2 - November 2021
XS1
0 5 10 15 20
Width (feet)
Cross Section July-21 (MY1 New As -built) —Cross Section Nov-21 —Bankfull
Bankfull Dimensions
Jul-21
Nov-21
x-section area (ft.sq.)
14.4
12.7
width (ft)
8.5
9.4
mean depth (ft)
1.7
1.4
max depth (ft)
2.6
2.5
wetted parimeter (ft)
11.3
12.5
hyd radi (ft)
1.3
1.0
width -depth ratio
5.0
6.9
25
30
35
* Elevations are all correct relative to each cross section but may not be the exact elevation above MSL.
Elevations were calculated based on a singular benchmark that is approximately 840 feet above MSL.

Elevation (Feet Above MSL (Approx.)
Attachment A
Cross Section Comparison Plots
844
843
842
841
840
839
838
837
836
TIEC - Repairs to UT to White Oak Creek
MY2 - November 2021
XS2
0
5
10
15
20
25
Width (Feet)
Cross Section July-21 (NewAs-built) —Cross Section Nov-21—Bankfull
Bankfull Dimensions
Jul-21
Nov-21
x-section area (ft.sq.)
26.5
21.0
width (ft)
19.8
15.8
mean depth (ft)
1.3
1.3
max depth (ft)
2.5
2.7
wetted parimeter (ft)
22.9
19.3
hyd radi (ft)
1.2
1.1
width -depth ratio
14.8
12.0
30
* Elevations are all correct relative to each cross section but may not be the exact elevation above MSL.
Elevations were calculated based on a singular benchmark that is approximately 840 feet above MSL.

Elevation (Feet Above MSL (Approx,))
Attachment A
Cross Section Comparison Plots
848
846
844
842
840
838
836
834
TIEC - Repairs to UT to White Oak Creek
MY2 - November 2021
XS3
0
5
10
15
Cross Section July-21 (NewAs-Built)
20 25
Width (Feet)
—Cross Section Nov-21 —Bankfull
Bankfull Dimensions
Jul-21
Nov-21
x-section area (ft.sq.)
30.5
24.9
width (ft)
18.8
17.7
mean depth (ft)
1.6
1.4
max depth (ft)
3.5
3.0
wetted parimeter (ft)
21.7
20.5
hyd radi (ft)
1.4
1.2
width -depth ratio
11.6
12.5
30
35
* Elevations are all correct relative to each cross section but may not be the exact elevation above MSL.
Elevations were calculated based on a singular benchmark that is approximately 840 feet above MSL.

Elevation (Feet Above MSL (Approx.)
840, 5
840
8395
839
8385
838
8375
837
8365
0
Attachment A
Cross Section Comparison Plots
XS4
TIEC - Repairs to UT to White Oak Creek
MY2 - November 2021
�4E
5
10
15
20
25
Width (Feet)
Cross Section July-21 (New As -Built) —Cross Section Nov-21—Bankfull
Bankfull Dimensions
Jul-21
Nov-21
x-section area (ft.sq.)
31.9
31.2
width (ft)
26.4
26.2
mean depth (ft)
1.2
1.2
max depth (ft)
3.0
3.0
wetted parimeter (ft)
27.8
28.1
hyd radi (ft)
1.1
1.1
width -depth ratio
21.8
22.0
30
* Elevations are all correct relative to each cross section but may not be the exact elevation above MSL.
Elevations were calculated based on a singular benchmark that is approximately 840 feet above MSL.

Attachment A
Cross Section Comparison Plots
TIEC - Repairs to UT to White Oak Creek
MY2 — November 2021
Longitudin
UT to White Oak Creek
+bed water srf —•—bankfull
x-section
• riffle crest • pool
■ run a glide
Channel Distance (ft)
slope (%) slope ratio length (ft) length ratio
reach 1.9 -- 200.0 (15.4 channel widths
riffle 3 1.6 2.7 (0 - 12.6) 2.2 (-- - 1)
pool 1.8 0.9 15.0 (0-7) 1.2 (---0.5)
run 2.1 1.1 10.0 (0 - 3) 0.8 (-- - 0.2)
glide 0 (0 - 5) 0 (0 - 2.6) 3.3 (1 - 2) 0.3 (0.1 - 0.2)
pool -pool spacing (ft) p-p ratio
42.0 (15 - 43) 3.2 (1.2 - 3.3)
* Elevations are all correct relative to the longitudinal profile but may not be the exact elevation above MSL. Elevations were calculated based
on a singular benchmark that is approximately 840 feet above MSL.