HomeMy WebLinkAbout20190157 Ver 1_Perry Hill_100093_MY3_2023_20231208
MONITORING YEAR 3
ANNUAL REPORT
FINAL
December 2023
PERRY HILL MITIGATION SITE
Orange County, NC
Neuse River Basin
HUC 03020201
DMS Project No. 100093
DMS Contract No. 7744
DMS RFP No. 16-007576
USACE Action ID No. 2019-00125
DWR Project No. 2019-0157 v1
Data Collection Period: January - October 2023
PREPARED FOR:
NC Department of Environmental Quality
Division of Mitigation Services
1652 Mail Service Center
Raleigh, NC 27699-1652
PREPARED BY:
312 West Millbrook Road, Suite 225
Raleigh, NC 27609
Jason Lorch
jlorch@wildlandseng.com
Phone: 919.851.9986
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL i
PERRY HILL MITIGATION SITE
Monitoring Year 3 Annual Report
TABLE OF CONTENTS
Section 1: PROJECT OVERVIEW .......................................................................................................1-1
1.1 Project Quantities and Credits ................................................................................................... 1-1
1.2 Project Goals and Objectives ..................................................................................................... 1-2
1.3 Project Attributes ....................................................................................................................... 1-4
Section 2: MONITORING YEAR 3 DATA ASSESSMENT .......................................................................2-1
2.1 Vegetative Assessment .............................................................................................................. 2-1
2.2 Vegetation Areas of Concern and Management ....................................................................... 2-1
2.3 Stream Assessment .................................................................................................................... 2-2
2.4 Stream Areas of Concern and Management.............................................................................. 2-2
2.5 Hydrology Assessment ............................................................................................................... 2-2
2.6 Monitoring Year 3 Summary ...................................................................................................... 2-2
Section 3: REFERENCES ...................................................................................................................3-1
TABLES
Table 1: Project Quantities and Credits ..................................................................................................... 1-1
Table 2: Goals, Performance Criteria, and Functional Improvements ...................................................... 1-3
Table 3: Project Attributes ......................................................................................................................... 1-5
Figures
Figures 1-1b Current Condition Plan View
APPENDICES
Appendix A Visual Assessment Data
Table 4 Visual Stream Morphology Stability Assessment Table
Table 5 Vegetation Condition Assessment Table
Stream Photographs
Culvert Crossing Photographs
Vegetation Plot Photographs
Appendix B Vegetation Plot Data
Table 6 Vegetation Plot Data
Table 7 Vegetation Performance Standards Summary Table
Appendix C Stream Geomorphology Data
Cross-Section Plots
Table 8 Baseline Stream Data Summary
Table 9 Cross-Section Morphology Monitoring Summary
Appendix D Hydrology Data
Table 10 Bankfull Events
Table 11 Rainfall Summary
Recorded Bankfull Events Plots
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL ii
Table 12 Recorded In-Stream Flow Events Summary
Recorded In-Stream Flow Events Plots
Appendix E Project Timeline and Contact Info
Table 13 Project Activity and Reporting History
Table 14 Project Contact Table
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 1-1
Section 1: PROJECT OVERVIEW
The Perry Hill Mitigation Site (Site) is located in Orange County, approximately three miles northwest of
Hillsborough, NC. The Site drains to Corporation Lake on the Eno River, which then flows to Falls Lake.
Corporation Lake is a water supply reservoir on the Eno River, which is classified as Water Supply Waters
(WS-II) and Nutrient Sensitive Waters (NSW). Falls Lake is classified as Water Supply Waters (WS-IV), as
well as Nutrient Sensitive Waters (NSW). Table 3 presents information related to the project attributes.
1.1 Project Quantities and Credits
The Site is located on one parcel and a conservation easement was recorded on 26.88 acres. Mitigation
work within the Site included restoration and enhancement I and II of perennial and intermittent stream
channels (Figures 1-1b). Approximately 20 feet (or a total of 0.19 acres) was added alongside both
internal crossings as a maintenance area in Monitoring Year 2. No credit is claimed in the maintenance
area and project credits were reduced accordingly. The credits associated with the stretch of inadequate
stream flow on UT1 Reach 1 have been put “at-risk” and are listed in red, for more information refer to
Sections 2.4 and 2.5. Table 1 below shows updated stream credits by reach and the total amount of
stream credits expected at closeout.
Table 1: Project Quantities and Credits
PROJECT MITIGATION QUANTITIES
Project
Segment
Mitigation
Plan
Footage
As-Built
Footage
Mitigation
Category
Restoration
Level
Mitigation
Ratio (X:1) Credits Comments
Stream
Perry Branch
Reach 1 321 323 Warm R 1.0 321.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
Perry Branch
Reach 2
344 342 Warm EII 3.5 98.286
Grade Control Structures,
Invasive Control, Planted
Buffer, Livestock
Exclusion
20 20 N/A N/A 0.0 N/A Maintenance Area
60 60 N/A N/A 0.0 N/A Culvert Crossing
Perry Branch
Reach 3 691 694 Warm R 1.0 691.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
Perry Branch
Reach 4
634 642 Warm R 1.0 634.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
20 20 N/A N/A 0.0 N/A Maintenance Area
60 60 N/A N/A 0.0 N/A Culvert Crossing
1,284 1,297 Warm R 1.0 1,284.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 1-2
PROJECT MITIGATION QUANTITIES
Project
Segment
Mitigation
Plan
Footage
As-Built
Footage
Mitigation
Category
Restoration
Level
Mitigation
Ratio
(X:1)
Credits Comments
Stream
UT1
Reach 1
222 222 Warm R 1.5 148.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
63 63 Warm R 1.5 42.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
UT1
Reach 2 291 293 Warm R 1.5 194.000
Full Channel Restoration,
Planted Buffer, Livestock
Exclusion
UT2
Reach 1 221 223 Warm EII 2.5 88.400 Bank Stabilization, Planted
Buffer, Livestock Exclusion
UT2
Reach 2 947 941 Warm EI 2.5 378.800
Grade Control Structures,
Bank Stabilization, Planted
Buffer, Livestock Exclusion
UT3 343 319 Warm EII 2.5 137.200
Grade Control Structures,
Bank Stabilization, Planted
Buffer, Livestock Exclusion
Total: 4,016.686
*Credits updated in Monitoring Year 2 to reflect the addition of the maintenance areas and resulting reduction in credits. Twenty
LF of stream fall within each of the maintenance areas, reducing credits on Perry Branch Reach 2 by 5.714 credits and Perry
Branch Reach 4 by 20 credits.
Blue = Restoration Restoration Credits at Risk Yellow = Enhancement I Orange = Enhancement II
1.2 Project Goals and Objectives
The project is intended to provide numerous ecological benefits. Table 2 below describes the project
goals and objectives along with the expected outcomes to water quality and ecological processes.
Additionally, performance criteria for project objectives and a summary of the related monitoring data
results for Monitoring Year 3 (MY3) are included.
Restoration Level Stream
Warm Cool Cold
Restoration 3,166.000
Restoration at Risk 148.000
Enhancement I 378.800
Enhancement II 323.886
Preservation --
Totals 4,016.686
Total Stream Credit 4,016.686
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 1-3
Table 2: Goals, Performance Criteria, and Functional Improvements
Goal Objective/ Treatment Likely Functional
Uplift Performance Criteria Measurement Cumulative
Monitoring Results
Exclude
livestock (i.e.
cattle) from
project
streams and
adjacent
riparian areas.
Exclude livestock from
streams and riparian
areas by installing
fencing around project
area and/or removing
livestock from the
Site.
Reduce and control
sediment inputs;
reduce and manage
nutrient inputs;
contribute to
protection of or
improvement to a
Water Supply
Waterbody.
Exclusion fencing is
installed and
maintained.
Livestock remain
excluded from the
project area.
Visually inspect
the perimeter,
as well as
interior, of the
Site to ensure
there are no
signs of
livestock
entering the
Site.
Cattle are excluded
from project streams.
Improve the
stability of
stream
channels.
Construct and
enhance stream
channels that will
maintain a stable
pattern and profile
considering the
hydrologic and
sediment inputs to the
system, the landscape
setting, and the
watershed conditions.
Reduce sediment
inputs; contribute to
protection of or
improvement to a
Water Supply
Waterbody.
Entrenchment ratio
over 2.2 and bank
height ratios below
1.2 with visual
assessments showing
stability.
Cross-section
monitoring will
be assessed
during MY1,
MY2, MY3,
MY5, and MY7
and visual
inspections will
be assessed
annually.
Cross-sections show
streams are stable and
functioning as
designed. ERs are over
2.2 and BHRs are below
1.2.
Improve
instream
habitat.
Install habitat features
such as constructed
riffles, cover logs, and
brush toes on
restored/enhanced
streams. Add woody
materials to channel
beds. Construct pools
of varying depth.
Improve aquatic
communities in
project streams.
There is no
performance
standard for this
metric.
N/A N/A
Reconnect
channels with
floodplains.
Reconstruct stream
channels with
appropriate bankfull
dimensions and depth
relative to the existing
floodplain.
Reduce and control
sediment inputs;
reduce and manage
nutrient inputs;
contribute to
protection of or
improvement to a
Water Supply
Waterbody.
Four bankfull events
in separate years
within monitoring
period. 30-days of
continuous surface
water flow will be
documented
annually along
intermittent
restoration or
enhancement I
reaches.
Pressure
transducers
recording flow
elevations.
No bankfull events
were documented on
project streams in
MY3. Greater than 30
days of consecutive
flow was recorded on
UT2 and on UT1 Reach
2 but not UT1 Reach 1.
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 1-4
Goal Objective/ Treatment Likely Functional
Uplift Performance Criteria Measurement Cumulative
Monitoring Results
Restore and
enhance
native
floodplain
vegetation.
Convert active
livestock pasture to
forested riparian
buffers along all Site
streams. Protect and
enhance existing
forested riparian
buffers. Treat invasive
species during
monitoring period to
permit establishment
of native plantings.
Reduce sediment
inputs; provide a
canopy to shade
streams and reduce
thermal loadings;
contribute to
protection of or
improvement to a
Water Supply
Waterbody.
Survival rate of 320
stems per acre at
MY3, 260 planted
stems per acre at
MY5, and 210 stems
per acre at MY7.
Vegetation plots will
average 7-ft in height
in MY5 and 10-ft in
height in MY7.
One hundred
square meter
vegetation plots
are placed on
2% of the
planted area of
the Site and
monitored
annually.
Thirteen of the
fourteen vegetation
plots have a planted
stem density greater
than 320 stems per
acre.
Permanently
protect the
Site from
harmful uses.
Establish a
conservation
easement on the Site.
Ensure that
development and
agricultural uses that
would damage the
Site or reduce the
benefits of the
project are
prevented.
Prevent easement
encroachment.
Visually inspect
the perimeter
of the Site to
ensure no
easement
encroachment
is occurring.
No easement
encroachments have
been observed in
MY3.
1.3 Project Attributes
The project includes one parcel that has been managed as pasture and/or crop production, as indicated
by aerial photographs from 1938 to 2017. Portions of the upper watershed historically have been
forested. The stream crossings which existed prior to construction on Perry Branch were installed before
1938. Forested areas within the headwaters of UT2 and UT3 were cleared between 1938 and 1950. The
high-voltage utility transmission line that crosses the downstream extent of Perry Branch was
constructed between 1938 and 1950. Between 1950 and 1955, two ponds were constructed on the
project parcel, including one within the headwaters of Perry Branch Reach 1 and the other an offline
pond adjacent to Perry Branch Reach 4 within the lower portion of the watershed. Table 3 below and
Table 8 in Appendix C present additional information on pre-restoration conditions. Project Activity and
Reporting History, as well as the Project Contact Table are included in Appendix E.
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 1-5
Table 3: Project Attributes
PROJECT INFORMATION
Project Name
Perry Hill
Mitigation
Site
County Orange County
Project Area (acres) 26.88 Project Coordinates 36° 06’ 25.81” N, 79° 07’46.66” W
PROJECT WATERSHED SUMMARY INFORMATION
Physiographic
Province
Carolina Slate
Belt of the
Piedmont
River Basin Neuse River
USGS HUC 8-digit 03020201 USGS HUC 14-digit 03020201030020
DWR Sub-basin 03-04-01 Land Use Classification 68% managed herbaceous cover/pasture; 22% forested; 5% shrub; 3%
grassland/herbaceous; 2% residential area; <1% impervious
Project Drainage
Area (acres) 174 Percentage of Impervious
Area <1%
RESTORATION TRIBUTARY SUMMARY INFORMATION
Parameters Perry Branch UT1 UT2 UT3 Reach 1 Reach 2 Reach 3 Reach 4 Reach 1 Reach 2 Reach 1 Reach 2
Pre-project length (feet) 326 417 732 2,061 388 213 266 974 357
Post-project length (feet)* 323 422 694 2,166 285 293 223 941 319
Valley confinement (Confined,
moderately confined, unconfined) Unconfined Moderately Confined
Confined
to
Moderately
Confined
Moderately
Confined Confined Moderately
Confined Unconfined
Drainage area (acres) 58 66 117 175 9 10 15 23 20
Perennial, Intermittent, Ephemeral Perennial Intermittent
DWR Water Quality Classification WS-II/HQW/NSW
Dominant Stream Classification
(existing) G4c C4 G4c F4 E6b F4b C6 E4 C4
*Includes No Credit Project Stream lengths in internal crossings, the maintenance area, and the downstream end of Perry Branch Reach 4.
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 1-6
RESTORATION TRIBUTARY SUMMARY INFORMATION
Parameters Perry Branch UT1 UT2 UT3 Reach 1 Reach 2 Reach 3 Reach 4 Reach 1 Reach 2 Reach 1 Reach 2
Dominant Stream Classification
(proposed) C4 C4 C4 C4 B4 C4b C6 C4 C4
Dominant Evolutionary class (Simon) if
applicable III V IV III/IV III/IV III/IV V III/IV III/IV
REGULATORY CONSIDERATIONS
Parameters Applicable? Resolved? Supporting Documentation
Water of the United States - Section 404 Yes Yes USACE Nationwide Permit No. 27 and DWQ 401 Water Quality Certification No.
4134. Water of the United States - Section 401 Yes Yes
Endangered Species Act Yes Yes Categorical Exclusion in Mitigation Plan (Wildlands, 2020) Historic Preservation Act Yes Yes
Coastal Zone Management Act (CZMA
or CAMA) N/A N/A N/A
Essential Fisheries Habitat N/A N/A N/A
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 2-1
Section 2: MONITORING YEAR 3 DATA ASSESSMENT
Annual monitoring and site visits were conducted during MY3 to assess the condition of the project. The
vegetation and stream success criteria for the Site follow the approved performance standards
presented in the Mitigation Plan (Wildlands Engineering, 2020). Performance criteria for vegetation,
stream, and hydrologic assessment are located above in Section 1.2 Table 3: Goals, Performance
Criteria, and Functional Improvements. Methodology for annual monitoring is described in the MY0 As-
Built Baseline Report (Wildlands, 2021).
2.1 Vegetative Assessment
The MY3 vegetative survey was completed in September 2023. Vegetation monitoring resulted in an
average density of 526 stems per acre of project planting list species across all vegetation plots, which is
well above the interim success criteria of 320 stems per acre required at MY3. Thirteen of the fourteen
vegetation plots individually met the success criteria and planting list stem densities for each plot range
from 202 to 769 stems per acre. While vegetation plot 10 does not meet the stem density success
criteria, it is not representative of the area surrounding it. There are healthy planted trees around the
plot that seem to be on par with density and growth across the rest of the site. We do not believe it is
currently a concern. Herbaceous vegetation is growing well and other desirable tree species such as
common hackberry (Celtis occidentalis) and hickory (Carya spp.) species are establishing themselves.
Refer to Appendix A for Vegetation Plot Photographs and the Vegetation Condition Assessment Table
and Appendix B for Vegetation Plot Data and Vegetation Performance Standards Summary Table.
2.2 Vegetation Areas of Concern and Management
Wildlands does not believe the area around vegetation plot 10 has low stem density or needs replanting
at this point. As mentioned above, there are healthy planted stems with density and growth that
resemble the rest of the site around the vegetation plot boundary. However, Wildlands will continue to
observe the area to confirm that tree health and density stays at an appropriate level.
As in the previous year, planted trees are growing well but pasture grasses are still dense in areas. To
ensure planted trees remain competitive, herbicide ring sprays were applied around the base of trees
where necessary in April 2023.
Areas where patches of blackberry (Rubus spp.) were competing with trees along UT2 were treated via
mechanical removal or a foliar spray application of triclopyr. Wildlands plans to continue to treat
aggressive blackberry growth as needed in spring of 2024.
Additionally, follow up treatments were done on a few stems of Chinese privet (Ligustrum sinense) along
the west side of UT2 using a cut stump application of triclopyr in May 2023. In 2024, Wildlands plans to
target scattered resprouts of Chinese privet in the wooded area along Perry Branch Reaches 1 and 2 that
was previously treated in 2020. Wildlands will continue to monitor for invasive species and treatments
will be applied as necessary.
While the vegetation across the maintenance areas is no longer a concern, Wildlands is still working to
mark the area appropriately. At the beginning of November, the surveyor was finally able to move the
corners of the Perry Hill II bank conservation easement that shares a boundary with the DMS easement,
and in doing so, marked the edge of the maintenance area as well. Wildlands would like to order
appropriate signs to differentiate the maintenance area from the rest of the conservation easement and
will install them in MY4.
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 2-2
2.3 Stream Assessment
Morphological surveys for MY3 were conducted in April 2023. All streams within the Site are stable and
functioning as designed. Cross-sections show minimal change in max depth and bankfull cross-sectional
area. Bank height ratios are less than 1.2 and entrenchment ratios are over 2.2. Specific entrenchment
ratio numbers are not included in this report template but are available upon request. Cross-sections
show slight deviations from as-built due to sediment deposition and establishment of vegetation. Some
sediment deposition in pools is natural and expected. Pebble count data is no longer required per the
September 29, 2021 Technical Work Group Meeting and is not included in this report. The IRT reserves
the right to request pebble count data/particle distributions if deemed necessary during the monitoring
period. Refer to Appendix A for the Visual Stream Morphology Stability Assessment Table, Current
Condition Plan View maps, Stream Photographs, and Culvert Crossing Photographs. Refer to Appendix C
for the morphological data and cross-section plots.
2.4 Stream Areas of Concern and Management
Wildlands continued to observe flow in the upper part of UT1 Reach 1 after the rock sill repair in
September 2022. Repairs did not have the desired effect and stream flow is similar to previous years.
The credits associated with the stretch of inadequate stream flow have been put “at-risk”, as seen in
Table 1 and Figure 1b. Wildlands will continue to monitor flow on UT1 Reach 1 through flow gauges and
visual observation and reevaluate the “at-risk” credits in MY4.
2.5 Hydrology Assessment
By the end of MY7, four bankfull events must have occurred in separate years within the restoration and
enhancement I reaches. While there were significant flow events, flow does not seem to have crested
top of bank. No bankfull events were recorded on Site during MY3.
In addition, the presence of baseflow must be documented on restored or enhanced intermittent
reaches (UT1 Reach 1 and UT2 Reach 2) for a minimum of 30 consecutive days during a normal
precipitation year. UT2 Reach 2 exceeded baseflow criterion with 154 consecutive and 176 total days of
baseflow. UT1 Reach 1 did not meet baseflow criteria. The original UT1 Reach 1 flow gauge recorded
one consecutive and six cumulative days of flow. UT1 Reach 1 flow gauge B shows four consecutive and
16 total days of flow. However, the crest gauge on UT1 Reach 2 is installed in such a way that it can also
record flow. It shows 54 days of consecutive and 72 total days of flow. Refer to Appendix D for
Hydrology Summary Data.
2.6 Monitoring Year 3 Summary
Vegetation across the Site has exceeded the MY3 interim requirement of 320 planted stems per acre.
Monitoring Year 3 data shows an average density of 526 stems per acre of project planting list species
across all plots. Aggressive vegetation and resprouts of invasive vegetation were treated in MY3 and
additional follow up treatments will be scheduled as necessary. Wildlands is working to mark the
maintenance area with appropriate signage. Project streams are stable and functioning. Cross-sections
show limited deviations from as-built due to sediment deposition and vegetation establishment. No
bankfull events were documented in MY3. UT2 and UT1 Reach 2 achieved more than 30 consecutive
days of baseflow, and while UT1 Reach 1. Rock sill repairs in September 2022 do not seem to have had
the desired effect and stream credits have been put “at-risk” accordingly. Wildlands will continue to
observe this stretch of channel and “at-risk” credits will be reevaluated in MY4. No easement
encroachment or stream crossing issues have been identified in MY3.
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 2-3
Summary information and data related to the performance of various project and monitoring elements
can be found in the tables and figures in the report appendices. All raw data supporting the tables and
figures in the appendices are available from DMS upon request.
Perry Hill Mitigation Site
Monitoring Year 3 Annual Report - FINAL 3-1
Section 3: REFERENCES
Breeding, R. 2010. Neuse River Basin Restoration Priorities. North Carolina Ecosystem Enhancement
Program. Accessed at:
https://files.nc.gov/ncdeq/Mitigation%20Services/Watershed_Planning/Neuse_River_Basin/FINAL%
20RBRP%20Neuse%202010_%2020111207%20CORRECTED.pdf
Doll, B.A., Grabow, G.L., Hall, K.A., Halley, J., Harman, W.A., Jennings, G.D., and Wise, D.E. 2003. Stream
Restoration A Natural Channel Design Handbook.
Harrelson, C.C; Rawlins, C.L.; Potyondy, John P. 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. Accessed at:
https://www.fs.fed.us/biology/nsaec/fishxing/fplibrary/Harrelson_1994_Stream_Channel_Reference
_Sites_An_Illustrated.pdf
Lee, M.T., Peet, R.K., Roberts, S.D., & Wentworth, T.R. 2008. CVS-EEP Protocol for Recording Vegetation
Version 4.2. Accessed at: http://cvs.bio.unc.edu/protocol/cvs-eep-protocol-v4.2-lev1-2.pdf
NOAA. 2022. National Integrated Drought Information System. Drought Conditions for Orange County.
Accessed at: https://www.drought.gov/states/north-carolina/county/orange
Rosgen, D.L. 1994. A classification of natural rivers. Catena 22:169-199.
Rosgen, D.L. 1996. Applied River Morphology. Pagosa Springs, CO: Wildland Hydrology Books.
United States Army Corps of Engineers. 2003. Stream Mitigation Guidelines. USACE, NCDENR-DWQ,
USEPA, NCWRC.
United States Geological Survey. 1998. North Carolina Geology. Accessed at:
http://www.geology.enr.state.nc.us/usgs/carolina.htm
Wildlands Engineering, Inc. 2020. Perry Hill Mitigation Plan. DMS, Raleigh, NC.
Wildlands Engineering, Inc. 2021. Perry Hill Baseline Monitoring Document and As-Built Baseline Report.
DMS, Raleigh, NC.
APPENDIX A. Visual Assessment Data
Table 4. Visual Stream Morphology Stability Assessment Table
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Perry Branch Reach 1
323
646
Surface Scour/
Bare Bank
Bank lacking vegetative cover resulting simply from
poor growth and/or surface scour.0 100%
Toe Erosion
Bank toe eroding to the extent that bank failure
appears likely. Does NOT include undercuts that are
modest, appear sustainable and are providing
habitat.
0 100%
Bank Failure Fluvial and geotechnical - rotational, slumping,
calving, or collapse.0 100%
0 100%
Grade Control Grade control structures exhibiting maintenance of
grade across the sill. 2 2 100%
Bank Protection Bank erosion within the structures extent of
influence does not exceed 15%. 4 4 100%
Visual assessment was completed October 18, 2023.
Perry Branch Reach 3 and Reach 4
2,653
5,306
Surface Scour/
Bare Bank
Bank lacking vegetative cover resulting simply from
poor growth and/or surface scour.0 100%
Toe Erosion
Bank toe eroding to the extent that bank failure
appears likely. Does NOT include undercuts that are
modest, appear sustainable and are providing
habitat.
0 100%
Bank Failure Fluvial and geotechnical - rotational, slumping,
calving, or collapse.0 100%
0 100%
Grade Control Grade control structures exhibiting maintenance of
grade across the sill. 18 18 100%
Bank Protection Bank erosion within the structures extent of
influence does not exceed 15%. 17 17 100%
Visual assessment was completed October 18, 2023.
Structure
Major Channel Category Metric
Number
Stable,
Performing
as Intended
Total
Number in
As-Built
Amount of
Unstable
Footage
Assessed Stream Length
Assessed Bank Length
Bank
Totals:
% Stable,
Performing as
Intended
Assessed Stream Length
Assessed Bank Length
Bank
Totals:
Structure
% Stable,
Performing as
Intended
Major Channel Category Metric
Number
Stable,
Performing
as Intended
Total
Number in
As-Built
Amount of
Unstable
Footage
Table 4. Visual Stream Morphology Stability Assessment Table
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
UT1 Reach 1 and Reach 2
578
1,156
Surface Scour/
Bare Bank
Bank lacking vegetative cover resulting simply from
poor growth and/or surface scour.0 100%
Toe Erosion
Bank toe eroding to the extent that bank failure
appears likely. Does NOT include undercuts that are
modest, appear sustainable and are providing
habitat.
0 100%
Bank Failure Fluvial and geotechnical - rotational, slumping,
calving, or collapse.0 100%
0 100%
Grade Control Grade control structures exhibiting maintenance of
grade across the sill. 18 18 100%
Bank Protection Bank erosion within the structures extent of
influence does not exceed 15%. 7 7 100%
Visual assessment was completed October 18, 2023.
UT2 Reach 2
941
1,882
Surface Scour/
Bare Bank
Bank lacking vegetative cover resulting simply from
poor growth and/or surface scour.0 100%
Toe Erosion
Bank toe eroding to the extent that bank failure
appears likely. Does NOT include undercuts that are
modest, appear sustainable and are providing
habitat.
0 100%
Bank Failure Fluvial and geotechnical - rotational, slumping,
calving, or collapse.0 100%
0 100%
Grade Control Grade control structures exhibiting maintenance of
grade across the sill. 8 8 100%
Bank Protection Bank erosion within the structures extent of
influence does not exceed 15%. 2 2 100%
Visual assessment was completed October 18, 2023.
Structure
Major Channel Category Metric
Number
Stable,
Performing
as Intended
Total
Number in
As-Built
Amount of
Unstable
Footage
Assessed Stream Length
Assessed Bank Length
Bank
Totals:
% Stable,
Performing as
Intended
Assessed Stream Length
Assessed Bank Length
Bank
Totals:
Structure
% Stable,
Performing as
Intended
Major Channel Category Metric
Number
Stable,
Performing
as Intended
Total
Number in
As-Built
Amount of
Unstable
Footage
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Planted Acreage 20.53
Vegetation Category Definitions
Mapping
Threshold
(ac)
Combined
Acreage
% of Planted
Acreage
Bare Areas Very limited cover of both woody and herbaceous material.0.10 0 0%
Low Stem Density Areas Woody stem densities clearly below target levels based on current MY stem count
criteria.0.10 0 0%
0 0%
Areas of Poor Growth
Rates Planted areas where average height is not meeting current MY Performance Standard.0.10 0 0%
0.0 0%
Visual assessment was completed October 18, 2023.
Easement Acreage 26.88
Vegetation Category Definitions
Mapping
Threshold
(ac)
Combined
Acreage
% of
Easement
Acreage
Invasive Areas of Concern
Invasives may occur outside of planted areas and within the easement and will
therefore be calculated against the total easement acreage. Include species with the
potential to directly outcompete native, young, woody stems in the short-term or
community structure for existing communities. Invasive species included in
summation above should be identified in report summary.
0.10 0 0%
Easement Encroachment
Areas
Encroachment may be point, line, or polygon.Encroachment to be mapped consists
of any violation of restrictions specified in the conservation easement.Common
encroachments are mowing,cattle access,vehicular access.Encroachment has no
threshold value as will need to be addressed regardless of impact area.
none
Visual assessment was completed October 18, 2023.
Table 5. Vegetation Condition Assessment Table
Total
Cumulative Total
0 Encroachments Noted
/ 0 ac
STREAM PHOTOGRAPHS
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 1 Perry Branch R1 – upstream (03/14/2023) PHOTO POINT 1 Perry Branch R1 – downstream (03/14/2023)
PHOTO POINT 2 Perry Branch R2 – upstream (03/14/2023) PHOTO POINT 2 Perry Branch R2 – downstream (03/14/2023)
PHOTO POINT 3 Perry Branch R3 – upstream (03/14/2023) PHOTO POINT 3 Perry Branch R3 – downstream (03/14/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 4 Perry Branch R3 – upstream (03/14/2023) PHOTO POINT 4 Perry Branch R3 – downstream (03/14/2023)
PHOTO POINT 5 Perry Branch R3 – upstream (03/14/2023) PHOTO POINT 5 Perry Branch R3 – downstream (03/14/2023)
PHOTO POINT 6 Perry Branch R4 – upstream (03/14/2023) PHOTO POINT 6 Perry Branch R4 – downstream (03/14/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 7 Perry Branch R4 – upstream (03/14/2023) PHOTO POINT 7 Perry Branch R4 – downstream (03/14/2023)
PHOTO POINT 8 Perry Branch R4 – upstream (03/14/2023) PHOTO POINT 8 Perry Branch R4 – downstream (03/14/2023)
PHOTO POINT 9 Perry Branch R4 – upstream (03/14/2023) PHOTO POINT 9 Perry Branch R4 – downstream (03/14/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 10 Perry Branch R4 – upstream (03/14/2023) PHOTO POINT 10 Perry Branch R4 – downstream (03/14/2023)
PHOTO POINT 11 Perry Branch R4 – upstream (03/14/2023) PHOTO POINT 11 Perry Branch R4 – downstream (03/14/2023)
PHOTO POINT 12 UT1 R1 – upstream (03/14/2023) PHOTO POINT 12 UT1 R1 – downstream (03/14/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 13 UT1 R2 – upstream (03/14/2023) PHOTO POINT 13 UT1 R2 – downstream (03/14/2023)
PHOTO POINT 14 UT2 R1 – upstream (03/14/2023) PHOTO POINT 14 UT2 R1 – downstream (03/14/2023)
PHOTO POINT 15 UT2 R2 – upstream (03/14/2023) PHOTO POINT 15 UT2 R2 – downstream (03/14/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 16 UT2 R2 – upstream (03/14/2023) PHOTO POINT 16 UT2 R2 – downstream (03/14/2023)
PHOTO POINT 17 UT2 R2 – upstream (03/14/2023) PHOTO POINT 17 UT2 R2 – downstream (03/14/2023)
PHOTO POINT 18 UT3 – upstream (03/14/2023) PHOTO POINT 18 UT3 – downstream (03/14/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Stream Photographs
PHOTO POINT 19 UT3 – upstream (03/14/2023) PHOTO POINT 19 UT3 – downstream (03/14/2023)
CULVERT CROSSING PHOTOGRAPHS
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Culvert Crossing Photographs
Perry Branch R2 – Looking Upstream (03/14/2023) Perry Branch R2 – Looking Downstream (03/14/2023)
Perry Branch R4 – Looking Upstream (03/14/2023) Perry Branch R4 – Looking Downstream (03/14/2023)
VEGETATION PLOT PHOTOGRAPHS
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Vegetation Plot Photographs
FIXED VEG PLOT 1 (09/07/2023) FIXED VEG PLOT 2 (09/07/2023)
FIXED VEG PLOT 3 (09/07/2023) FIXED VEG PLOT 4 (09/07/2023)
FIXED VEG PLOT 5 (09/07/2023) FIXED VEG PLOT 6 (09/07/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Vegetation Plot Photographs
FIXED VEG PLOT 7 (09/07/2023) FIXED VEG PLOT 8 (09/07/2023)
FIXED VEG PLOT 9 (09/07/2023) FIXED VEG PLOT 10 (09/07/2023)
FIXED VEG PLOT 11 (09/07/2023) FIXED VEG PLOT 12 (09/07/2023)
Perry Hill Mitigation Site
Appendix A: Visual Assessment Data – Vegetation Plot Photographs
RANDOM VEG PLOT 13 (09/07/2023) RANDOM VEG PLOT 14 (09/07/2023)
APPENDIX B. Vegetation Plot Data
Table 6. Vegetation Plot Data
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
20.53
2021-04-04
2023-09-07
0.0247
Planted Total Planted Total Planted Total Planted Total Planted Total
Acer negundo1 boxelder Tree FAC 1 1 1 1 1 1
Asimina triloba1 pawpaw Tree FAC
Betula nigra river birch Tree FACW 3 3 2 2 1 1 4 4 2 2
Cornus amomum1 silky dogwood Shrub FACW 1 1
Diospyros virginiana common persimmon Tree FAC 2 3 1 1
Nyssa sylvatica blackgum Tree FAC
Platanus occidentalis American sycamore Tree FACW 2 2 4 4 1 1 2 2 2 2
Populus deltoides eastern cottonwood Tree FAC 2 2 1 1 1 1
Quercus alba white oak Tree FACU
Quercus falcata southern red oak Tree FACU
Quercus lyrata overcup oak Tree OBL 2 2 2 2
Quercus pagoda cherrybark oak Tree FACW 1 1 1 1 1 1 2 2
Quercus phellos willow oak Tree FAC 1 1
Quercus rubra northern red oak Tree FACU 2 2
Ulmus alata winged elm Tree FACU
Ulmus americana American elm Tree FACW 2 2 1 1 1 1
Viburnum prunifolium1 blackhaw Tree FACU 1 1
Sum 10 10 11 11 9 10 10 10 11 11
Carya glabra pignut hickory Tree FACU
Carya tomentosa mockernut hickory Tree 1
Celtis occidentalis common hackberry Tree FACU 1
Fraxinus caroliniana Carolina ash Tree OBL
Fraxinus pennsylvanica green ash Tree FACW 4
Juglans nigra black walnut Tree FACU
Liquidambar styraciflua sweetgum Tree FAC 2 1
Ulmus sp.1
Sum 10 14 11 14 9 10 10 10 11 11
10 11 10 10 11
405 445 405 405 445
6 5 7 5 8
30 36 25 40 17
5 8 4 6 6
0 0 0 0 0
14 14 10 10 11
567 567 405 405 445
7 8 7 5 8
30 36 25 40 17
7 7 4 6 6
0 0 0 0 0
1Species not subject to monitoring height requirement due to species growth habit.
2Subcanopy tree species not subject to the height requirement have been removed from average height calculations.
Dominant Species Composition (%)
1). Bolded species are proposed for the current monitoring year, italicized species are not approved, and a regular font indicates that the species has been approved.
2). The "Species Included in Approved Mitigation Plan" section contains only those species that were included in the original approved mitigation plan. The "Post Mitigation Plan Species" section includes species that are being proposed through a mitigation plan addendum for the current monitoring
year (bolded) , species that have been approved in prior monitoring years through a mitigation plan addendum (regular font), and species that are not approved (italicized).
3). The "Mitigation Plan Performance Standard" section is derived only from stems included in the original mitigation plan, whereas the "Post Mitigation Plan Performance Standard" includes data from mitigation plan approved, post mitigation plan approved, and proposed stems.
Proposed Standard
Performance Standard
Post Mitigation
Plan Species
Mitigation Plan
Performance
Standard
Post Mitigation
Plan
Performance
Standard
Current Year Stem Count
Stems/Acre
Species Count
Dominant Species Composition (%)
Average Plot Height (ft.)2
Average Plot Height (ft.)2
% Invasives
% Invasives
Current Year Stem Count
Stems/Acre
Species Count
Veg Plot 5 FIndicator
Status
Veg Plot 1 F Veg Plot 2 F Veg Plot 3 F Veg Plot 4 FScientific Name Common Name Tree/
Shrub
Species
Included in
Approved
Mitigation Plan
Planted Acreage
Date of Initial Plant
Date of Current Survey
Plot size (ACRES)
Table 6. Vegetation Plot Data
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
20.53
2021-04-04
2023-09-07
0.0247
Planted Total Planted Total Planted Total Planted Total Planted Total
Acer negundo1 boxelder Tree FAC 1 1 1 1 1 1 3 3
Asimina triloba1 pawpaw Tree FAC
Betula nigra river birch Tree FACW 3 3 1 1 3 3 2 2
Cornus amomum1 silky dogwood Shrub FACW
Diospyros virginiana common persimmon Tree FAC 1 1 3 3 1 1 1 1
Nyssa sylvatica blackgum Tree FAC
Platanus occidentalis American sycamore Tree FACW 6 6 2 3 2 2 3 4 2 2
Populus deltoides eastern cottonwood Tree FAC 1 1 2 2 1 2 1 1
Quercus alba white oak Tree FACU
Quercus falcata southern red oak Tree FACU
Quercus lyrata overcup oak Tree OBL 2 2
Quercus pagoda cherrybark oak Tree FACW 1 1 1 1 2 2 1 1 1 1
Quercus phellos willow oak Tree FAC 1 1
Quercus rubra northern red oak Tree FACU 2 2
Ulmus alata winged elm Tree FACU 2
Ulmus americana American elm Tree FACW 2 2 4 4 1 1
Viburnum prunifolium1 blackhaw Tree FACU 1 1 1 1
Sum 15 15 11 12 17 19 13 15 5 5
Carya glabra pignut hickory Tree FACU 1
Carya tomentosa mockernut hickory Tree
Celtis occidentalis common hackberry Tree FACU
Fraxinus caroliniana Carolina ash Tree OBL
Fraxinus pennsylvanica green ash Tree FACW
Juglans nigra black walnut Tree FACU
Liquidambar styraciflua sweetgum Tree FAC 1
Ulmus sp.2
Sum 15 15 11 14 17 20 13 15 5 5
15 12 19 15 5
607 486 769 607 202
6 9 8 8 4
40 25 20 27 40
11 5 7 7 9
0 0 0 0 0
15 14 20 15 5
607 567 810 607 202
6 10 9 8 4
40 25 20 27 40
11 4 7 7 9
0 0 0 0 0
1Species not subject to monitoring height requirement due to species growth habit.
2Subcanopy tree species not subject to the height requirement have been removed from average height calculations.
1). Bolded species are proposed for the current monitoring year, italicized species are not approved, and a regular font indicates that the species has been approved.
2). The "Species Included in Approved Mitigation Plan" section contains only those species that were included in the original approved mitigation plan. The "Post Mitigation Plan Species" section includes species that are being proposed through a mitigation plan addendum for the current monitoring
year (bolded) , species that have been approved in prior monitoring years through a mitigation plan addendum (regular font), and species that are not approved (italicized).
3). The "Mitigation Plan Performance Standard" section is derived only from stems included in the original mitigation plan, whereas the "Post Mitigation Plan Performance Standard" includes data from mitigation plan approved, post mitigation plan approved, and proposed stems.
Common Name Tree/
Shrub
Species
Included in
Approved
Mitigation Plan
Planted Acreage
Date of Initial Plant
Date of Current Survey
Plot size (ACRES)
Stems/Acre
Species Count
Veg Plot 10 FVeg Plot 8 F Veg Plot 9 FVeg Plot 6 F Veg Plot 7 FIndicator
StatusScientific Name
Dominant Species Composition (%)
Proposed Standard
Performance Standard
Post Mitigation
Plan Species
Mitigation Plan
Performance
Standard
Post Mitigation
Plan
Performance
Standard
Current Year Stem Count
Stems/Acre
Species Count
Dominant Species Composition (%)
Average Plot Height (ft.)2
Average Plot Height (ft.)2
% Invasives
% Invasives
Current Year Stem Count
Table 6. Vegetation Plot Data
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
20.53
2021-04-04
2023-09-07
0.0247
Veg Plot 13 R Veg Plot 14 R
Planted Total Planted Total Total Total
Acer negundo1 boxelder Tree FAC 1 1
Asimina triloba1 pawpaw Tree FAC 1 1
Betula nigra river birch Tree FACW 2 2 2 2 3 1
Cornus amomum1 silky dogwood Shrub FACW
Diospyros virginiana common persimmon Tree FAC 3 4 2 4 1 5
Nyssa sylvatica blackgum Tree FAC 1 1
Platanus occidentalis American sycamore Tree FACW 4 4 4 4 1 3
Populus deltoides eastern cottonwood Tree FAC 1 1 2 2
Quercus alba white oak Tree FACU 1 1
Quercus falcata southern red oak Tree FACU 3
Quercus lyrata overcup oak Tree OBL
Quercus pagoda cherrybark oak Tree FACW 1 1 4
Quercus phellos willow oak Tree FAC
Quercus rubra northern red oak Tree FACU 1 1 1 1 2
Ulmus alata winged elm Tree FACU 1 1 6 2
Ulmus americana American elm Tree FACW
Viburnum prunifolium1 blackhaw Tree FACU
Sum 13 14 13 15 18 17
Carya glabra pignut hickory Tree FACU 1
Carya tomentosa mockernut hickory Tree 2
Celtis occidentalis common hackberry Tree FACU 3
Fraxinus caroliniana Carolina ash Tree OBL 1
Fraxinus pennsylvanica green ash Tree FACW
Juglans nigra black walnut Tree FACU 1
Liquidambar styraciflua sweetgum Tree FAC 2
Ulmus sp.
Sum 13 20 13 15 18 18
14 15 18 17
567 607 729 688
7 8 7 6
27 24 33 29
5 7 4 6
0 0 0 0
20 15 18 18
810 607 729 729
10 8 7 7
27 24 33 29
4 7 4 6
0 0 0 0
1Species not subject to monitoring height requirement due to species growth habit.
2Subcanopy tree species not subject to the height requirement have been removed from average height calculations.
1). Bolded species are proposed for the current monitoring year, italicized species are not approved, and a regular font indicates that the species has been approved.
2). The "Species Included in Approved Mitigation Plan" section contains only those species that were included in the original approved mitigation plan. The "Post Mitigation Plan Species" section includes species that are being proposed through a mitigation plan addendum for the current monitoring
year (bolded) , species that have been approved in prior monitoring years through a mitigation plan addendum (regular font), and species that are not approved (italicized).
3). The "Mitigation Plan Performance Standard" section is derived only from stems included in the original mitigation plan, whereas the "Post Mitigation Plan Performance Standard" includes data from mitigation plan approved, post mitigation plan approved, and proposed stems.
Performance Standard
Post Mitigation
Plan Species
Mitigation Plan
Performance
Standard
Post Mitigation
Plan
Performance
Standard
Current Year Stem Count
Stems/Acre
Species Count
Dominant Species Composition (%)
Average Plot Height (ft.)2
Average Plot Height (ft.)2
% Invasives
% Invasives
Current Year Stem Count
Veg Plot 11 F Veg Plot 12 F
Planted Acreage
Date of Initial Plant
Date of Current Survey
Plot size (ACRES)
Common Name Tree/
Shrub
Species
Included in
Approved
Mitigation Plan
Stems/Acre
Species Count
Indicator
StatusScientific Name
Dominant Species Composition (%)
Proposed Standard
Table 7. Vegetation Performance Standards Summary Table
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives
405 5 6 0 445 8 5 0 405 4 7 0
364 5 6 0 445 6 5 0 364 4 7 0
607 2 6 0 486 3 6 0 405 3 7 0
607 2 6 0 486 2 6 0 486 2 8 0
Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives
405 6 5 0 445 5 8 0 607 11 6 0
364 4 4 0 445 4 8 0 648 6 6 0
567 2 6 0 445 3 8 0 648 4 6 0
607 2 6 0 486 2 9 0 688 2 6 0
Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives
486 5 9 0 769 7 8 0 607 7 8 0
486 3 9 0 769 5 9 0 526 4 8 0
486 2 9 0 729 3 8 0 526 3 8 0
486 2 9 0 729 2 8 0 526 2 8 0
Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives
202 9 4 0 567 5 7 0 607 7 8 0
324 4 6 0 567 4 7 0 607 5 8 0
567 2 8 0 567 3 7 0 607 3 8 0
648 2 8 0 607 2 7 0 607 2 8 0
Stems/Ac.Av. Ht. (ft)1 # Species % Invasives Stems/Ac.Av. Ht. (ft)1 # Species % Invasives
729 4 7 0 688 6 6 0
405 4 6 0 567 7 6 0
364 3 4 0 445 3 6 0
567 2 7 0 445 2 8 0
*Each monitoring year represents a different plot for the random vegetation plot "groups". Random plots are denoted with an R, and fixed plots with an F.
1Subcanopy tree species not subject to the height requirement have been removed from average height calculations.
Monitoring Year 1
Monitoring Year 0
Veg Plot 1 F Veg Plot 2 F Veg Plot 3 F
Veg Plot 4 F Veg Plot 5 F Veg Plot 6 F
Veg Plot 7 F Veg Plot 8 F Veg Plot 9 F
Veg Plot 10 F Veg Plot 11 F Veg Plot 12 F
Veg Plot Group 13 R Veg Plot Group 14 R
Monitoring Year 0
Monitoring Year 7
Monitoring Year 5
Monitoring Year 3
Monitoring Year 2
Monitoring Year 7
Monitoring Year 5
Monitoring Year 3
Monitoring Year 2
Monitoring Year 1
Monitoring Year 2
Monitoring Year 7
Monitoring Year 5
Monitoring Year 3
Monitoring Year 2
Monitoring Year 1
Monitoring Year 2
Monitoring Year 1
Monitoring Year 0
Monitoring Year 1
Monitoring Year 0
Monitoring Year 7
Monitoring Year 5
Monitoring Year 3
Monitoring Year 0
Monitoring Year 7
Monitoring Year 5
Monitoring Year 3
APPENDIX C. Stream Geomorphology Data
Cross-Section Plots
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 650.73 650.88 650.81 650.84
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 0.96 1.01 0.99
Thalweg Elevation 649.33 649.61 649.60 649.63
LTOB Elevation 650.73 650.83 650.83 650.83
LTOB Max Depth 1.44 1.22 1.23 1.20
LTOB Cross-Sectional Area 6.71 6.24 6.83 6.61
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 637.59 637.57 637.54 637.49
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 0.88 0.89 0.95
Thalweg Elevation 636.38 636.56 636.52 636.43
LTOB Elevation 637.59 637.45 637.43 637.44
LTOB Max Depth 1.21 0.89 0.91 1.01
LTOB Cross-Sectional Area 6.27 5.22 5.06 5.73
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area N/A N/A N/A N/A
Bank Height Ratio - Based
on AB-Bankfull Area N/A N/A N/A N/A
Thalweg Elevation 634.49 634.71 634.76 634.70
LTOB Elevation 637.17 637.32 637.40 637.40
LTOB Max Depth 2.68 2.61 2.64 2.70
LTOB Cross-Sectional Area 16.26 16.24 16.79 16.87
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 634.12 634.27 634.26 634.26
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 0.96 0.97 1.00
Thalweg Elevation 632.30 632.49 632.56 632.50
LTOB Elevation 634.12 634.20 634.21 634.27
LTOB Max Depth 1.81 1.71 1.65 1.77
LTOB Cross-Sectional Area 12.85 11.91 12.18 12.96
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area N/A N/A N/A N/A
Bank Height Ratio - Based
on AB-Bankfull Area N/A N/A N/A N/A
Thalweg Elevation 630.33 630.62 630.61 630.60
LTOB Elevation 633.73 633.76 633.77 633.76
LTOB Max Depth 3.40 3.14 3.16 3.16
LTOB Cross-Sectional Area 28.55 26.42 25.56 25.26
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area N/A N/A N/A N/A
Bank Height Ratio - Based
on AB-Bankfull Area N/A N/A N/A N/A
Thalweg Elevation 618.34 618.60 618.51 618.85
LTOB Elevation 621.17 621.28 621.32 621.37
LTOB Max Depth 2.83 2.68 2.81 2.52
LTOB Cross-Sectional Area 26.08 22.86 23.88 22.83
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 620.89 621.15 621.17 621.14
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 0.87 0.91 0.91
Thalweg Elevation 618.98 619.35 619.33 619.33
LTOB Elevation 620.89 620.92 621.01 620.98
LTOB Max Depth 1.91 1.57 1.68 1.65
LTOB Cross-Sectional Area 14.13 11.34 12.15 12.17
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 626.30 626.45 626.46 626.47
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 0.82 0.79 0.78
Thalweg Elevation 625.54 625.77 625.80 625.84
LTOB Elevation 626.30 626.33 626.32 626.33
LTOB Max Depth 0.77 0.56 0.52 0.49
LTOB Cross-Sectional Area 2.52 1.86 1.72 1.72
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 618.63 618.74 618.76 618.74
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 1.02 1.05 1.07
Thalweg Elevation 617.81 617.99 618.01 617.97
LTOB Elevation 618.63 618.76 618.80 618.80
LTOB Max Depth 0.82 0.77 0.79 0.83
LTOB Cross-Sectional Area 3.23 3.32 3.49 3.60
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area 641.54 641.78 641.80 641.74
Bank Height Ratio - Based
on AB-Bankfull Area 1.00 0.82 0.73 0.83
Thalweg Elevation 640.35 640.63 640.62 640.62
LTOB Elevation 641.54 641.58 641.48 641.55
LTOB Max Depth 1.18 0.95 0.86 0.93
LTOB Cross-Sectional Area 5.39 3.93 3.42 4.08
Perry Hill Mitigation Site
Appendix C: Stream Geomorphology Data – Cross-Section Plots
Downstream (04/04/2023)
MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation - Based
on AB-Bankfull Area N/A N/A N/A N/A
Bank Height Ratio - Based
on AB-Bankfull Area N/A N/A N/A N/A
Thalweg Elevation 637.54 637.81 637.83 638.03
LTOB Elevation 640.51 640.30 640.24 640.22
LTOB Max Depth 2.97 2.49 2.41 2.19
LTOB Cross-Sectional Area 14.86 12.04 12.15 11.50
Table 8. Baseline Stream Data Summary
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Parameter
Riffle Only Min Mean Med Max n Min Max Max Min n
Bankfull Width (ft)2.7 2.9 2.9 3.1 2 1
Floodprone Width (ft)4 4 4 4 2 1
Bankfull Mean Depth (ft)0.4 0.5 0.5 0.6 2 1
Bankfull Max Depth (ft)0.6 0.7 0.7 0.8 2 1
Bankfull Cross Sectional Area (ft2)1.1 1.6 1.6 2.0 2 1
Width/Depth Ratio 5.2 6.0 6.0 6.8 2 1
Entrenchment Ratio 1.3 1.4 1.4 1.4 2 1
Bank Height Ratio 2.1 2.4 2.4 2.7 2 1.0 1.1 1
Max particle size (mm) mobilized at bankfull
Rosgen Classification
Bankfull Discharge (cfs)2.8 4.4 4.4 5.9 2 1
Sinuosity
Water Surface Slope (ft/ft)
Other
Parameter
Riffle Only Min Mean Med Max n Min Max Min Max n
Bankfull Width (ft)5.3 5.7 5.7 6.1 2 1
Floodprone Width (ft)11.0 12.5 12.5 14.0 2 1
Bankfull Mean Depth (ft)0.6 0.7 0.7 0.7 2 1
Bankfull Max Depth (ft)0.7 0.8 0.8 0.8 2 1
Bankfull Cross Sectional Area (ft2)3.4 3.5 3.5 3.6 2 1
Width/Depth Ratio 8.7 8.8 8.8 8.8 2 1
Entrenchment Ratio 2.1 2.2 2.2 2.2 2 1
Bank Height Ratio 1.9 2.1 2.1 2.3 2 1.0 1.1 1
Max particle size (mm) mobilized at bankfull
Rosgen Classification
Bankfull Discharge (cfs)9.1 9.7 9.7 10.2 2 1
Sinuosity
Water Surface Slope (ft/ft)
Other
Parameter
Riffle Only Min Mean Med Max n Min Max Min Max n
Bankfull Width (ft)5.7 6.7 6.0 9.3 4 13.0 13.1 2
Floodprone Width (ft)9 12 12 17 4 125 175 2
Bankfull Mean Depth (ft)0.6 0.8 0.8 1.0 4 1.0 1.1 2
Bankfull Max Depth (ft)0.9 1.2 1.2 1.4 4 1.8 1.9 2
Bankfull Cross Sectional Area (ft2)4.0 5.1 5.2 5.9 4 12.8 14.1 2
Width/Depth Ratio 6.3 9.2 7.9 14.6 4 12.1 13.1 2
Entrenchment Ratio 1.4 1.9 1.8 2.7 4 9.6 13.5 1
Bank Height Ratio 1.2 2.2 2.3 3.0 4 1.0 1.1 2
Max particle size (mm) mobilized at bankfull
Rosgen Classification
Bankfull Discharge (cfs)10.8 15.1 14.4 20.7 4 48.3 56.4 2
Sinuosity
Water Surface Slope (ft/ft)
Other
8.7
1.0
9.2
80
0.7
1.4
6.8
12.6
1.10
8.0
29
0.6
1.0
5.0
36
C4
14.9
Perry Branch Reach 1
0.0128
---
PRE-EXISTING CONDITIONS DESIGN
1.16
39
C4
1.13
MONITORING BASELINE
(MY0)
---
G4c
9.6
22.0
0.0129
61
12.8
7.6
---
0.0127
156
0.8
1.2
7.2
12.8
16.3
35 46
0.0135 0.0130
32
G4c C4 C4
25.1 17.9
---------
1.15 1.12 1.12
0.0155
9.1
1.0
11.0
100
0.6
1.2
6.3
19.2
11.4
123
0.9
1.4
10.1
12.9
0.0111 0.0110
10.8
1.0
33 46 48
F4 C4 C4
Perry Branch Reach 3
Perry Branch Reach 4
---------
35.5
1.11 1.14 1.15
0.0109
Table 8. Baseline Stream Data Summary
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Parameter
Riffle Only Min Mean Med Max n Min Max Min Max n
Bankfull Width (ft)1.7 1.7 1 1
Floodprone Width (ft)6.0 6.0 1 1
Bankfull Mean Depth (ft)0.8 0.8 1 1
Bankfull Max Depth (ft)1.1 1.1 1 1
Bankfull Cross Sectional Area (ft2)1.4 1.4 1 1
Width/Depth Ratio 2.1 2.1 1 1
Entrenchment Ratio 3.3 3.3 1 1
Bank Height Ratio 1.9 1.9 1 1.0 1.1 1
Max particle size (mm) mobilized at bankfull
Rosgen Classification
Bankfull Discharge (cfs)7.5 7.5 1 1
Sinuosity
Water Surface Slope (ft/ft)
Other
Parameter
Riffle Only Min Mean Med Max n Min Max Max Min n
Bankfull Width (ft)3.7 4.6 4.6 5.4 2 1
Floodprone Width (ft)7 8 8 9 2 1
Bankfull Mean Depth (ft)0.3 0.4 0.4 0.4 2 1
Bankfull Max Depth (ft)0.6 0.7 0.7 0.7 2 1
Bankfull Cross Sectional Area (ft2)1.4 1.5 1.5 1.6 2 1
Width/Depth Ratio 9.3 14.0 14.0 18.7 2 1
Entrenchment Ratio 1.6 1.8 1.8 2.0 2 1
Bank Height Ratio 2.6 2.8 2.8 3.0 2 1.0 1.1 1
Max particle size (mm) mobilized at bankfull
Rosgen Classification
Bankfull Discharge (cfs)3.2 3.5 3.5 3.7 2
Sinuosity
Water Surface Slope (ft/ft)
Other
Parameter
Riffle Only Min Mean Med Max n Min Max Min Max n
Bankfull Width (ft)3.2 3.8 4.0 4.0 3 1
Floodprone Width (ft)20 44 42 69 3 1
Bankfull Mean Depth (ft)0.6 0.7 0.7 0.8 3 1
Bankfull Max Depth (ft)1.0 1.1 1.0 1.2 3 1
Bankfull Cross Sectional Area (ft2)2.0 2.7 2.7 3.0 3 1
Width/Depth Ratio 5.0 5.4 5.2 5.9 3 1
Entrenchment Ratio 6.2 11.3 10.3 17.3 3 1
Bank Height Ratio 1.2 1.4 1.3 1.6 3 1.0 1.1 1
Max particle size (mm) mobilized at bankfull
Rosgen Classification
Bankfull Discharge (cfs)6.2 8.7 9.0 10.9 3 1
Sinuosity
Water Surface Slope (ft/ft)
Other
0.8 0.4
1.9
7.5
22
E6b
3.3
1.4
PRE-EXISTING CONDITIONS DESIGN
0.6
2.5
14.32.1
1.7
1.1
6.0
11
---------
9.4
1.04
11.7
1.06
0.0473 0.0522
1.04
0.0508
13.2
8.7
1.0
111 94
B4
MONITORING BASELINE
(MY0)
B4
1.8
5.8
50
0.4
0.8
2.5
UT1 Reach 1
6
6.0 6.4
113 175
0.5 0.5
0.8 0.8
2.9 3.2
12.5 13.0
18.8 27.2
1.0
22 51 48
F4b C4b C4b
7.6 11.0
1.14 1.15 1.14
0.0204 0.0221 0.0233
---------
6.0 7.7
44 100
0.5 0.7
0.7 1.2
2.7 5.4
13.2 10.8
7.3 13.0
1.0
52 37 51
C4
8.2 20.7
1.13 1.11 1.11
UT1 Reach 2
UT2 Reach 2
0.0187 0.0177 0.0179
---------
E4 C4
DMS Project No. 100093
Monitoring Year 3 - 2023
MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation (ft) - Based on AB-Bankfull1 Area 650.73 650.88 650.81 650.84 637.59 637.57 637.54 637.49 N/A N/A N/A N/A
Bank Height Ratio - Based on AB Bankfull1 Area 1.00 0.96 1.01 0.99 1.00 0.88 0.89 0.95 N/A N/A N/A N/A
Thalweg Elevation 649.33 649.61 649.60 649.63 636.38 636.56 636.52 636.43 634.49 634.71 634.76 634.70
LTOB2 Elevation 650.73 650.83 650.83 650.83 637.59 637.45 637.43 637.44 637.17 637.32 637.40 637.40
LTOB2 Max Depth (ft)1.44 1.22 1.23 1.20 1.21 0.89 0.91 1.01 2.68 2.61 2.64 2.70
LTOB2 Cross-Sectional Area (ft2)6.71 6.24 6.83 6.61 6.27 5.22 5.06 5.73 16.26 16.24 16.79 16.87
MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation (ft) - Based on AB-Bankfull1 Area 634.12 634.27 634.26 634.26 N/A N/A N/A N/A N/A N/A N/A N/A 620.89 621.15 621.17 621.14
Bank Height Ratio - Based on AB Bankfull1 Area 1.00 0.96 0.97 1.00 N/A N/A N/A N/A N/A N/A N/A N/A 1.00 0.87 0.91 0.91
Thalweg Elevation 632.30 632.49 632.56 632.50 630.33 630.62 630.61 630.60 618.34 618.60 618.51 618.85 618.98 619.35 619.33 619.33
LTOB2 Elevation 634.12 634.20 634.21 634.27 633.73 633.76 633.77 633.76 621.17 621.28 621.32 621.37 620.89 620.92 621.01 620.98
LTOB2 Max Depth (ft)1.81 1.71 1.65 1.77 3.40 3.14 3.16 3.16 2.83 2.68 2.81 2.52 1.91 1.57 1.68 1.65
LTOB2 Cross-Sectional Area (ft2)12.85 11.91 12.18 12.96 28.55 26.42 25.56 25.26 26.08 22.86 23.88 22.83 14.13 11.34 12.15 12.17
MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7 MY0 MY1 MY2 MY3 MY5 MY7
Bankfull Elevation (ft) - Based on AB-Bankfull1 Area 626.30 626.45 626.46 626.47 618.63 618.74 618.76 618.74 641.54 641.78 641.80 641.74 N/A N/A N/A N/A
Bank Height Ratio - Based on AB Bankfull1 Area 1.00 0.82 0.79 0.78 1.00 1.02 1.05 1.07 1.00 0.82 0.73 0.83 N/A N/A N/A N/A
Thalweg Elevation 625.54 625.77 625.80 625.84 617.81 617.99 618.01 617.97 640.35 640.63 640.62 640.62 637.54 637.81 637.83 638.03
LTOB2 Elevation 626.30 626.33 626.32 626.33 618.63 618.76 618.80 618.80 641.54 641.58 641.48 641.55 640.51 640.30 640.24 640.22
LTOB2 Max Depth (ft)0.77 0.56 0.52 0.49 0.82 0.77 0.79 0.83 1.18 0.95 0.86 0.93 2.97 2.49 2.41 2.19
LTOB2 Cross-Sectional Area (ft2)2.52 1.86 1.72 1.72 3.23 3.32 3.49 3.60 5.39 3.93 3.42 4.08 14.86 12.04 12.15 11.50
Perry Branch Reach 1 Perry Branch Reach 3
Cross-Section 7 (Riffle)
Cross-Section 8 (Riffle)Cross-Section 9 (Riffle)
Perry Branch Reach 4
Cross-Section 4 (Riffle)Cross-Section 5 (Pool)Cross-Section 6 (Pool)
1Bank Height Ratio (BHR) takes the As-Built bankfull area as the basis for adjusting each subsequent years bankfull elevation.
2LTOB Cross-Sectional Area and Max depth are based on the LTOB elevation for each years survey (The same elevation used for the LTOB in the BHR calculation). Area below the LTOB elevation will be used and tracked for each year as above. The difference between the LTOB elevation and
the thalweg elevation (same as in the BHR calculation) will be recorded and tracked above as LTOB max depth.
*Entrenchment Ratios for each cross-section available upon request.
Cross-Section 10 (Riffle)Cross-Section 11 (Pool)
UT1 Reach 1 UT1 Reach 2 UT2 Reach 2
Table 9. Cross-Section Morphology Monitoring Summary
Perry Hill Mitigation Site
Cross-Section 1 (Riffle)Cross-Section 2 (Riffle)Cross-Section 3 (Pool)
APPENDIX D. Hydrology Data
Reach MY1 (2021)1 MY2 (2022)MY3 (2023)2 MY4 (2024)MY5 (2025)MY6 (2026)MY7 (2027)
Perry Branch
Reach 1 N/A N/A N/A
Perry Branch
Reach 4 N/A N/A N/A
Perry Branch
Reach 4 (Gauge B)
Installed
January 2022 5/24/2022 N/A
UT1 Reach 2 7/19/2021 5/23/2022 N/A
3/9/2022
5/23-24/2022
MY1 (2021)MY2 (2022)MY3 (2023)MY4 (2024)MY5 (2025)MY6 (2026)MY7 (2027)
Annual Precipitation
Total 40.10 in^48.4 in 39.26*
30 Year Average Precip
WETS 30th Percentile 43.75 in 43.52 in 44.06 in
30 Year Average Precip
WETS 70th Percentile 51.13 in 51.01 in 51.44 in
Annual Precipitation
Compared to Normal Low Normal *
30 Year Average Precipitation Source: Chapel Hill 2 W Station, Orange County, NC, AgACIS (Approximately 16 miles from Site)
^MY1 Report calculation erroneously included December 2020 daily rainfall data.
*Annual precipitation total includes data from 1/1/2023 to 10/18/2023. Data from the remainder of MY3 will be updated in MY4.
Annual Precipitation Source: Durham 11 W Station, Orange County, NC, State Climate Office (Approximately 9.5 miles from Site)
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Table 10. Bankfull Events
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
Table 11. Rainfall Summary
1Gauges were installed mid-March 2021.
2Data was collected 1/1/2023 to 10/18/2023. Data from the remainder of MY3 will be updated in MY4.
UT2 Reach 2 7/19/2021 N/A
Recorded Bankfull Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
160 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
1
2
3
4
5
6
7
8
9
648
649
650
651
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: Perry Branch Reach 1 - Crest Gauge
Recorded Bankfull Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
235 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
1
2
3
4
5
6
7
8
9
632
633
634
635
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: Perry Branch Reach 4 - Crest Gauge
Recorded Bankfull Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
128 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
1
2
3
4
5
6
7
8
9
618
619
620
621
622
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: Perry Branch Reach 4 - Crest Gauge B
Recorded Bankfull Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
54 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
1
2
3
4
5
6
7
8
9
617
618
619
620
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: UT1 Reach 2 - Crest and Flow Gauge
Recorded Bankfull Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
129 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
1
2
3
4
5
6
7
8
9
639
640
641
642
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: UT2 Reach 2 - Crest Gauge
Table 12. Recorded In-Stream Flow Events Summary
Perry Hill Mitigation Site
DMS Project No. 100093
Monitoring Year 3 - 2023
MY1 (2021)1 MY2 (2022)MY3 (2023)2 MY4 (2024)MY5 (2025)MY6 (2026)MY7 (2027)
1 Day/
1 Day
1 Day/
10 Days
1 Day/
6 Days
Not Installed until
December 2021
20 Days/
123 Days
4 Days/
16 Days
98 Days/
154 Days
164 Days/
212 Days
154 Days/
176 Days
*Success criterion is presence of baseflow for a minimum of 30 consecutive days.
1Gauges were installed mid-March 2021.
2Data was collected 1/1/2023 to 10/18/2023. Data from the remainder of MY3 will be updated in MY4.
Reach Max Consecutive Days/Total Days of Baseflow*
UT1
Reach 1
UT2
Reach 2
UT1
Reach 1 (Gauge B)
Recorded In-stream Flow Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
1 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
2
4
6
8
10
12
623
624
625
626
627
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: UT1 Reach 1 - In-Stream Flow Gauge
Recorded In-stream Flow Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
4 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
2
4
6
8
10
12
630
631
632
633
634
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: UT1 Reach 1 - In-Stream Flow Gauge B
Recorded In-stream Flow Events Plot
Monitoring Year 3 - 2023
Perry Hill Mitigation Site
DMS Project No. 100093
154 days of consecutive stream flow
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
0
2
4
6
8
10
12
646
647
648
649
650
Pr
e
c
i
p
i
t
a
t
i
o
n
(
i
n
)
El
e
v
a
t
i
o
n
(
f
t
)
Monitoring Year 3 - 2023
Daily Precipitation Water Level Thalweg Bankfull 30-Day Rolling Precip Total 30th & 70th Percentile
Perry Hill: UT2 Reach 2 - In-Stream Flow Gauge
APPENDIX E. Project Timeline and Contact Info
DMS Project No. 100093
Invasive Vegetation Treatment
Easement Encroachment
Competitive Vegetation Treatment1
Invasive Vegetation Treatment
In-Stream Vegetation Treatment
UT1 Channel Repair
DMS Project No. 100093
Baseline Monitoring Document (Year 0)Stream Survey March 2021
September 2022
August 2022
October 2021
Stream Survey
March and August 2022
October 2021
May 2021April 2021
April 2022
Year 1 Monitoring
Year 2 Monitoring
2024
Stream Survey
December 2024
Stream Survey
Vegetation Survey
December 2022April 2022
April 2023
September 2022
Competitive Vegetation Treatment1
Invasive Vegetation Treatment
April 2023
May 2023
September 2023
Main Stream Earthwork, Inc.
Table 14. Project Contact Table
2027Stream Survey
Vegetation Survey December 2027
Wildlands Engineering, Inc.
Construction Contractor
Reidsville, NC 27320
631 Camp Dan Valley Rd
843.277.6221
Designer
Geoff Smith, PE
1Herbicide ring sprays around the base of planted stems.
497 Bramson Ct, Suite 104
Mt. Pleasant, SC 29464
Monitoring Year 3 - 2023
Year 6 Monitoring
2025
December 2026
Perry Hill Mitigation Site
2027Year 7 Monitoring
2025 December 2025Year 5 Monitoring
July 2020Mitigation Plan Approved July 2020
919.851.9986
Jason Lorch
Monitoring Performers Wildlands Engineering, Inc.
Monitoring, POC
Vegetation Survey December 2021October 2021
Stream Survey
December 2023
Vegetation Survey
2026
Year 4 Monitoring
Table 13. Project Activity and Reporting History
Activity or Report Data Collection Complete Completion or Scheduled Delivery
Project Instituted NA December 2018
Perry Hill Mitigation Site
Monitoring Year 3 - 2023
November 2020Invasive Vegetation Treatment
Vegetation Survey
Vegetation Survey
As-Built Survey Completed
Competitive Vegetation Treatment1
April 2021 April 2021
April 2021
October 2021
March 2021Construction (Grading) Completed NA
Year 3 Monitoring