20131200 Ver 6_Year 1 Monitoring Report 2021_20210716

Tryon International Equestrian Center
2021 Monitoring Year 1 Report
Polk County, North Carolina
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DWR# 20131200 v6
Data collected:
July 2021
Submitted on:
July 16, 2021
Prepared for: Prepared by:
CLearWaer
Tryon Equestrian Partners,LLC
ClearWater Environmental Consultants,Inc.
145 7th Avenue W; Suite B,
2659 Sandy Plains Road
Tryon,NC 28782 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(Attachment A)sent by the NC Division of Water Resources. In order to satisfy the
conditions of the permit modification and resolve the NOV, Clearwater Environmental Consultants 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 is the first annual monitoring report(MY1)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.
Now that additional post construction repairs are complete,2021 starts MY1.This annual monitoring report
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 page i
Monitoring Year 1 Report for repairs to UT to White Oak Creek
July 2021

Table of Contents
Introduction
Monitoring project success criteria 1
Methods 1
Geomorphic Surveys 1
Photographic Documentation 1
Results 2
Photographic Documentation Results 2
Geomorphic Monitoring 16
Conclusions 18
References 19
Attachment A
• Longitudinal Profile Survey Visualization and Parameters from"The Reference Reach
Spreadsheet"
• Cross-Sections 1-4 Survey Visualization and Parameters from"The Reference Reach
Spreadsheet"for MY 1 and the As-Built Survey
Tryon International Equestrian Center page ii
Monitoring Year 1 Report for repairs to UT to White Oak Creek
July 2021

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.
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 July 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 the all monitoring features.
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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

Results
Photographic Documentation Results
Visual assessment was performed at the time of the As-Built Geomorphic Survey on November 22,2019,
as well as during the MY1 Geomorphic Survey on July 2, 2021. The visual assessment photos of the As-
Built and MY1 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
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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Photo Point 6 Facing Stormwater confluence with UT to White Oak Creek: MY1 (7/2/2021)
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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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:
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Overview of additional stabilization measures Inner meander bend seed and matting(1/20/2021)
(1/20/2021)
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outlet(1/20/2021) RCP stormwater outlet(1/20/2021)
Live stakes planted April 2020 on the outside meander bend have had a poor rate of establishment.Roughly
half of the live stakes observed did not sprout as of the MY1 site visit.Approximately eight live stakes are
established. Installation of additional live stakes is recommended. Photos of the outside meander bend live
stakes are below:
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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

Geomorphic Monitoring
Cross section surveys were performed during the November 2019 As-Built Assessment and again on July
2,2021 for MY1.MY1 data is compared to geomorphic data collected during the As-Built assessment.Due
to the additional stabilization measures that were installed along both banks since the As-Built survey, and
the results of MY1 geomorphic assessment, there is no significant evidence of widening or incision at
monitoring cross sections,at this time.
Cross section comparison graphs and the longitudinal profile are included in Attachment A.
Cross Section 1 (XS 1)showed slight downcutting(a few inches)at the thalweg. The right bank of XS 1 was
re-stabilized in early 2021 and has a sediment wattle in the cross section.XS2 shows the re-graded left bank
with a new rock toe,and sediment wattle,abutting the stream bed.The right bank at XS2 also had additional
stabilization work completed since the As-Built survey. No significant changed was noted to the stream
bed at XS2. XS3 shows very little change across the entire cross section. The left bank of XS3 was re-
seeded and matted in early 2021. XS4 shows some very minor downcutting along the thalweg and will be
an area of interest during annual year 2 monitoring(MY2).The left bank at XS4 had additional stabilization
work conducted in early 2021.
The table below summarizes Geomorphic Data for the monitoring record:
XS1 XS2 XS3 XS4
Bankfull Dimensions Riffle Run Pool Riffle
Nov-19 Jul-21 Nov-19 Jul-21 Nov-19 Jul-21 Nov-19 Jul-21
x-section area (ft.sq.) 12.6 14.4 20.0 26.5 26.3 30.5 27.5 31.9
width (ft) 7.8 8.5 14.3 19.8 18.5 18.8 17.5 26.4
mean depth (ft) 1.6 1.7 1.4 1.3 1.4 1.6 1.6 1.2
max depth (ft) 2.3 2.6 2.3 2.5 3.3 3.5 2.8 3.0
wetted parimeter(ft) 10.2 11.3 16.2 22.9 20.6 21.7 18.7 27.8
hyd radi (ft) 1.2 1.3 1.2 1.2 1.3 1.4 1.5 1.1
width-depth ratio 4.8 5.0 10.2 14.8 12.9 11.6 11.2 21.8
In addition,photographic documentation of geomorphic cross sections are included below:
Cross Section Photographs
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Cross Section 1 Facing Downstream(7/2/2021) Cross Section 1 Facing Upstream(7/2/2021)
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Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Tryon International Equestrian Center page 17 of 10
Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

Conclusions
The overall geomorphic condition of UT to White Oak Creek appears to be stable within most of the project
area.The recent stabilization work appears to be effective at stabilizing the stream during heavy stormwater
flows. Minor amounts of cobble and boulder mobilization was observed below the stormwater outlet
structure. This area will continue to be an area of interest over the next two monitoring years. 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.
Comparing MY1 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. MY1
indicates that the site generally meets performance standards.
CEC will conduct the MY2 during the summer of 2021 and send the report to DWR for review.
Tryon International Equestrian Center page 18 of 10
Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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 page 19 of 10
Monitoring Year 1 for repairs to UT to White Oak Creek
July 2021

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Attachment A TIEC -Repairs to UT to White Oak Creek
Cross Section Comparison Plots MY1 -July 2021
XS1 - Riffle -0+65
842.5
Q $42
841.5 - ` -
-1 841 -
840.5 •
a
840
839.5 •
m 839
V 838.5
a 838
m 837.5 , 1
w 0 5 10 15 20 25 30 35
Width (feet)
Cross Section Nov-19(As-built) —Cross Section Jul-21 —Bankfull Jul-21
Bankfull Dimensions
Nov-19 Jul-21
x-section area (ft.sq.) 12.6 14.4
width (ft) 7.8 8.5
mean depth (ft) 1.6 1.7
max depth (ft) 2.3 2.6
wetted parimeter(ft) 10.2 11.3
hyd radi (ft) 1.2 1.3
width-depth ratio 4.8 5.0
* 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 TIEC -Repairs to UT to White Oak Creek
Cross Section Comparison Plots MY1 -July 2021
XS2 -Run- 1+04
844 -
x
0
a 843
0_
842
841
0
¢ 840
I
839 838 -
m 837
0 5 10 15 20 25 30 35
Width (Feet)
Cross Section Nov-19(As-built) —Cross Section Jul-21 —Bankfull Jul-21
Bankfull Dimensions
Nov-19 Jul-21
x-section area (ft.sq.) 20 26.5
width (ft) 14.3 19.8
mean depth (ft) 1.4 1.3
max depth (ft) 2.3 2.5
wetted parimeter(ft) 16.2 22.9
hyd radi (ft) 1.2 1.2
width-depth ratio 10.2 14.8
* 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 TIEC -Repairs to UT to White Oak Creek
Cross Section Comparison Plots MY1 -July 2021
XS3 -Pool -1+15
848
0
a 846 —
o_
Q
844
co
m 842
0
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Q 840 -
ii 638 -- - —
2 836 -- - -- - - -
La
w 834
0 5 10 15 20 25 30 35 40
Width(Feet)
•Cross Section Nov-19(As-Built) —Cross Section Jul-21 —Bankfull Jul-21
Bankfull Dimensions
Nov-19 Jul-21
x-section area (ft.sq.) 26.3 30.5
width (ft) _ 18.5 18.8
mean depth (ft) 1.4 1.6
max depth (ft) 3.3 3.5
wetted parimeter(ft) 20.6 21.7
hyd radi (ft) 1.3 1.4
width-depth ratio 12.9 11.6
* 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 TIEC -Repairs to UT to White Oak Creek
Cross Section Comparison Plots MY1 -July 2021
XS4 - Riffle-1+43
841 -
X
2 840.5 - —
a
840 -
J
u) 839.5
839
Q 838.5
0 838
u_
O 837.5
1i 837
N
w 836.5 I
0 5 10 15 20 25 30 35
Width (Feet)
Cross Section Nov-19(As-Built) —Cross Section Jul-21 —Bankfull Jul-21
Bankfull Dimensions
Nov-19 Jul-21
x-section area (ft.sq.) 27.5 31.9
width (ft) _ 17.5 26.4
mean depth (ft) 1.6 1.2
max depth (ft) 2.8 3.0
wetted parimeter(ft) 18.7 27.8
hyd radi (ft) 1.5 1.1
width-depth ratio 11.2 21.8
* 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 TIEC -Repairs to UT to White Oak Creek
Cross Section Comparison Plots MYI -July 2021
Longitudinal Profile-UTto White Oak Creek
tbed —•—water srf —•—bankfull n x-section a riffle crest o pool • run glide
842
a 841
Q
840 +:',..<
co
a)• 839
838 -
a)
u- 837
C
o 836
a)
a)
w 835
0 50 100 150 200
Channel Distance(Feet)
slope(%) slope ratio length(ft) length ratio pool-pool spacing(ft) p-p ratio
reach 1.9 --- 200.0 (15.4 channel widths --- --- ---
riffle 3 1.6 6.8 (0- 13.5) 2.2 (----1) --- ---
pool 1.8 0.9 15.0 (0- 12) 1.2 (----0.9) 42.0 (15-42) 3.2 (1.2-3
run 2.1 1.1 10.0 0.8 --- ---
glide 1.3 0.7 3.3 0.3 --- ---
* 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.