20170537 Ver 1_Year 3 2021 Monitoring Report_20210920

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20170537
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Erin Davis
Initial Review Completed Date 09/20/2021
Mitigation Project Submittal - 9/20/2021
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Stream Wetlands Buffer Nutrient Offset
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Jamey McEachran jmceachran©res.us
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Hannah Bridge Stream and Wetland
Mitigation Site
Johnston
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Mitigation Monitoring Report

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HANNAH BRIDGE STREAM
AND WETLAND MITIGATION SITE
JOHNSTON COUNTY, NORTH CAROLINA
SAW-2015-01799 I NEU-CONSTREAMAND WETLAND UMBI
YEAR 3 MONITORING REPORT
Provided by:
fires
Bank Sponsor: EBX-Neuse, LLC,
An entity of Resource Environmental Solutions
3600 Glenwood Ave, Suite 100
Raleigh, NC 27612
919-209-1056
September 2021

Table of Contents
1.0 Project Summary..................................................................................................................................... I
1.1
Project Location and Description.............................................................................................. I
1.2
Project Goals and Objectives.................................................................................................... 2
1.3
Project Success Criteria............................................................................................................. 2
StreamSuccess Criteria................................................................................................................... 2
WetlandSuccess Criteria................................................................................................................. 3
VegetationSuccess Criteria............................................................................................................. 3
1.4
Project Components.................................................................................................................. 3
1.5
Design/Approach.......................................................................................................................4
Stream.............................................................................................................................................. 4
Wetland............................................................................................................................................ 5
1.6
Construction and As -Built Conditions...................................................................................... 6
1.7
Year 3 Monitoring Performance(MY3).................................................................................... 6
Vegetation........................................................................................................................................ 6
StreamGeomorphology................................................................................................................... 7
StreamHydrology............................................................................................................................ 7
WetlandHydrology.......................................................................................................................... 7
2.0 Methods.................................................................................................................................................. 7
3.0 References............................................................................................................................................... 9
Appendix A: Background Tables
Table 1: Project Mitigation Components
Table 2: Project Activity and Reporting History
Table 3: Project Contacts Table
Table 4: Project Background Information
Figure 1: Site Location Map
Appendix B: Visual Assessment Data
Figure 2: Current Conditions Plan View
Vegetation Plot Photos
Monitoring Device Photos
Stream and Vegetation Problem Areas
Appendix C: Vegetation Plot Data
Table 5: Planted Species Summary
Table 6: Vegetation Plot Mitigation Success Summary
Table 7 Stem Count Total and Planted by Plot Species
Appendix D: Stream Measurement and Geomorphology Data
Baseline Cross -Section Plots
Table 8. Baseline Stream Data Summary
Table 9. Cross Section Morphology Data Table
Appendix E: Hydrology Data
Table 10. 2021 Rainfall Summary
Table 11. Documentation of Geomorphically Significant Flow Events
MY3 Stream Flow Hydrograph
Table 12. 2021 Max Hydroperiod
Table 13. Summary of Groundwater Monitoring Results
MY3 Groundwater Well Hydrographs
Hannah Bridge Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

1.0 Proiect Summary
1.1 Project Location and Description
The Hannah Bridge Stream and Wetland Mitigation Site (the Site) is located within a watershed dominated
by agricultural land use in Johnston County, North Carolina, approximately 5 miles south of the town of
Four Oaks. The project streams and wetlands were significantly impacted by channelization and cattle
access. The project involves the restoration and protection of streams in the Neuse River watershed and the
restoration and enhancement of adjacent riparian wetlands. The purpose of this mitigation site is to restore
and enhance a stream/wetland complex located within the Neuse River Basin. The Site was constructed in
concurrence with the Hannah Bridge Riparian Buffer and Nutrient Offset Mitigation Bank.
The Site lies within USGS Hydrologic Unit Code (HUC) 03020201 (USGS, 2012) and within the North
Carolina Division of Water Resources (NCDWR) Neuse River Sub -basin 03-04-02 (NCDENR, 2005). The
2010 Neuse River Basin Plan (NRBP) identified the Hannah Creek watershed (HUC 03020201150020) as
a Targeted Local Watershed (TLW), a watershed that exhibits both the need and opportunity for wetland,
stream, and riparian buffer restoration.
The total easement area is 46.2 acres. The wooded areas along the easement corridor designated for
restoration activities were classified as mixed hardwoods. Invasive species were present throughout the
wooded areas. Channels restored were degraded to a point where they no longer accessed their floodplain,
lacked riparian buffers, allowed livestock access, and aquatic life was not supported. Additionally, the
riparian buffer was in poor condition throughout most of the project area where it was devoid of trees or
shrubs and pasture was present up to the edge of the pre -construction channel.
The Site includes Priority I restoration, Enhancement Level I, Enhancement Level II, and Preservation.
Priority I restoration reaches incorporate the design of a single -thread meandering channel, with parameters
based on data taken from the reference site described above, published empirical relationships, NC Coastal
Plain Regional Curves, and hydrologic and hydraulic analyses.
The Site includes wetland restoration, enhancement, and preservation. Wetland restoration occurs adjacent
to Priority I stream restoration reaches. The restoration approach was to reconnect the floodplain wetlands
to the stream, fill existing ditches, rough the floodplain surface, and plant native tree and shrub species
commonly found in small stream swamp ecosystems. The wetland enhancement treatment primarily
excludes livestock, improves hydrology via pond removal and ditch plugging and planting native tree and
shrub species.
The Site is to be monitored on a regular basis and a physical inspection of the Site will be conducted at a
minimum of twice per year throughout the seven-year post -construction monitoring period, or until
performance standards are met. These site inspections will identify site components and features that require
routine maintenance. The measure of stream restoration success will be documented by bankfu11 flows and
no change in stream channel classification. Sand bed channels are dynamic and minor adjustments to
dimension and profile are expected. The measure of vegetative success for the Site will be the survival of
at least 210 seven-year old planted trees per acre with an average height of 10 feet at the end of year seven
of the monitoring period.
Upon approval for closeout by the Interagency Review Team (IRT), the Site will be transferred to the North
Carolina Wildlife Habitat Foundation (NCWHF). The NCWHF will be responsible for periodic inspection
of the Site to ensure that restrictions required in the Conservation Easement or the deed restriction
document(s) are upheld. Endowment funds required to uphold easement and deed restrictions will be
negotiated prior to site transfer to the responsible party.
Hannah Bridge 1 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

1.2 Project Goals and Objectives
The 2010 Neuse River Basin Restoration Priorities (RBRP) identified several restoration needs for the
entire Neuse River Basin, as well as for HUC 03020201, specifically. The Hannah Creek watershed (HUC
03020201150020) was identified as a Targeted Local Watershed (TLW), a watershed that exhibits both the
need and opportunity for wetland, stream, and riparian buffer restoration. The Hannah Creek watershed
includes 34 square miles of watershed area, with forty-two percent of the 102 stream miles lacking wooded
buffers. Fifty-four percent of the watershed is used for agricultural purposes and seven percent is currently
developed.
The Site was identified as a stream and buffer restoration opportunity to improve water quality, habitat, and
hydrology within the Neuse River Basin. This project is intended to provide Stream Mitigation Units to be
applied as compensatory mitigation for unavoidable authorized impacts to waters of the US under Section
404 of the Clean Water Act (33 U.S.C. 1344) and support the overall goal of "no net loss" of aquatic
resources in the United States. The Site is located within the downstream end of HUC 03020201 and
includes streams that directly discharge into Hannah Creek. The overarching goal of this project is to
address major watershed stressors identified in the 2010 Neuse RBRP for this TLW by promoting nutrient
and sediment reduction in agricultural areas by restoring and preserving streams, wetlands, and riparian
buffers and improve functional uplift to the ecosystem. The project design goals and objectives, including
restoration of riparian buffers to filter runoff from agricultural operations and improve terrestrial habitat,
and construction of in -stream structures to improve habitat diversity, will address the degraded water quality
and nutrient input from farming.
The project goals will be addressed through the following project objectives:
• Increase forested riparian buffers to at least fifty feet on both sides of the channel along the project
reach with an appropriate riparian plant community (a Coastal Plain Small Stream Swamp diverse
mix of species).
• Increase plant species diversity and eradicate invasive species within the project boundaries.
• Improve flood bank connectivity by reducing bank height ratios and increase entrenchment ratios
to reference reach levels.
• Reduce sediment supply from eroding stream banks in order to restore channel stability by restoring
the stream channel pattern, dimension, and profile in stream channels to reference reach conditions.
• Reduce impact of livestock to the stream channels and runoff through the increase in the livestock
exclusion.
• Restore stable flow dynamics by improving stream velocity and shear stress to levels between the
critical shear stress (shear stress required to initiate motion) and the allowable limits
1.3 Project Success Criteria
The Site follows the USACE 2003 Stream Mitigation Guidelines and the "Wilmington District Stream and
Wetland Compensatory Mitigation Update" dated October 24, 2016. Cross section and vegetation plot data
will be collected in Years 0, 1, 2, 3, 5, and 7. Stream and wetland hydrology data and visual monitoring
will be reported annually.
Stream Success Criteria
Four bankfull flow events must be documented within the seven-year monitoring period. The bankfull
events must occur in separate years. Otherwise, the stream monitoring will continue until four bankfull
events have been documented in separate years.
Hannah Bridge 2 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

There should be little change in as -built cross -sections. If changes do take place, they should be evaluated
to determine if they represent a movement toward a less stable condition (for example down -cutting or
erosion), or are minor changes that represent an increase in stability (for example settling, vegetative
changes, deposition along the banks, or decrease in width/depth ratio). Cross sections shall be classified
using the Rosgen stream classification method, and all monitored cross -sections should fall within the
quantitative parameters defined for channels of the design stream type. Bank height ratio shall not exceed
1.2, and the entrenchment ratio shall be no less than 2.2 within restored reaches. Channel stability should
be demonstrated through a minimum of four bankfull events documented in the seven-year monitoring
period.
Digital images will be used to subjectively evaluate channel aggradation or degradation, bank erosion,
success of riparian vegetation, and effectiveness of erosion control measures. Longitudinal images should
not indicate the absence of developing bars within the channel or an excessive increase in channel depth.
Lateral images should not indicate excessive erosion or continuing degradation of the banks over time. A
series of images over time should indicate successional maturation of riparian vegetation.
Wetland Success Criteria
The Natural Resources Conservation Service (MRCS) has a current WETS table for Johnston County upon
which to base a normal rainfall amount and average growing season. The closest comparable data station
was determined to be the WETS station for Smithfield, NC. The growing season for Johnston County is
233 days long, extending from March 18 to November 6, and is based on a daily minimum temperature
greater than 28 degrees Fahrenheit occurring in five of ten years.
Based upon field observation across the site, the NRCS mapping units show a good correlation to actual
site conditions in areas of the site. Mitigation guidance for soils in the Coastal Plain suggests a hydroperiod
for the Bibb soil of 12-16 percent of the growing season. The hydrology success criterion for the Site is to
restore the water table so that it will remain continuously within 12 inches of the soil surface for at least 12
percent of the growing season (approximately 27 days) at each groundwater gauge location.
Vegetation Success Criteria
Specific and measurable success criteria for plant density within the riparian buffers on the Site will follow
IRT Guidance. Vegetation monitoring plots will be a minimum of 0.02 acres in size, and cover a minimum
of two percent of the planted area. Vegetation monitoring will occur between July 1st and leaf drop. The
interim measures of vegetative success for the site will be the survival of at least 320 planted three-year
old trees per acre at the end of Year 3, 260 five-year old trees at the end of Year 5 with an average height
of seven feet, and the final vegetative success criteria will be 210 trees per acre with an average height of
10 feet at the end of Year 7. Height measurement success criteria do not apply to the understory trees or
shrubs. Volunteer trees will be counted, identified to species, and included in the yearly monitoring
reports, but will not be counted towards the success criteria of total planted stems.
1.4 Project Components
The project area is comprised of two separate easement locations along multiple drainage features that flow
into Hannah Creek. The northern easement area captures a single tributary to Hannah Creek and a portion
of its headwaters. The southern easement area is separated from the northern area by an active agricultural
field, and is divided into three different areas due to a utility crossing and a culvert crossing. The stream
and wetland mitigation components are summarized below and in Table 1.
Hannah Bridge 3 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

Mitigation Plan Stream Credits
MitigationMitigation
Mitigation
Stationing
Existing
Reach
Plan(Length
SMUs
Type
(Mitigation
Plan)
Length (LF)
Ratio
HB1
Restoration
0+15
to
1+31
99
117
1:1
117
HB1
Restoration
1+63
to
14+45
1,385
1,284
1:1
1,284
HB2
Enhancement II
14+45
to
18+37
392
392
2.5:1
157
HB3
Restoration
18+37
to
36+44
1,588
1,807
1:1
1,807
HB4
Enhancement I
36+84
to
42+63
579
579
1.5:1
386
HB4
Preservation
42+63
to
44+91
228
228
10:1
23
HF1
Preservation
2+18
to
16+04
1,386
1,386
10:1
139
HF2
Preservation
6+40
to
7+89
149
149
10:1
15
TH3
Enhancement I t
0+63
to
7+79
716
716
1:1
716
Total
6,522 6,658
4,643
t Restoration Credit
Mitigation Plan Wetland Credits
Mitigation Type
Total Acres
Mitigation Ratio
WMUs
Re-establishment
3.27
1:1
3.27
Enhancement - High
12.37
2:1
6.18
Enhancement - Low
1.67
3:1
0.56
Preservation
7.27
10:1
0.73
Protection
2.55
No Credit
0.00
27.13
10.73
1. S Design/Approach
The Site includes Priority I restoration, Enhancement Level I, Enhancement Level II, and Preservation.
Priority I restoration reaches incorporate the design of a single -thread meandering channel, with parameters
based on data taken from the reference site, published empirical relationships, NC Coastal Plain Regional
Curves, and hydrologic and hydraulic analyses. As a result of the restoration of planform and dimension,
frequent overbank flows, and a restored riparian buffer provide the appropriate hydrology and sediment
transport throughout this Coastal Plain watershed. All non -vegetated areas within the easement were
planted with native vegetation and any areas of invasive species were removed and/or treated.
• Reach HB1— Reach begins at western limits of project totaling 1,430 linear feet but is adjusted to
1,400 linear feet due to a 30-foot break in the easement due to an overhead power line. Priority I
Hannah Bridge 4 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

Restoration was used for Reach BB 1 which included relocating the channel towards the north, such
that it meanders within the middle of the valley.
Reach HB2 (STA 14+45 to STA 18+37) — Reach begins at the end of BB 1 and flows northeast to
the confluence with Reach HB3 totaling 392 linear feet. Enhancement Level II was used for Reach
HB2, beginning approximately 200 feet downstream of the confluence with HF1. Minimal grading
and live stake planting were required in the few areas that exhibited bank erosion. Invasive species
were treated and removed during construction, and those areas were replanted with native riparian
vegetation.
• Reach HB3 (STA 18+37 to STA 36+44) — Reach immediately downstream of Reach HB2 and
flows east to an existing farm crossing totaling 1,807 linear feet. Priority I Restoration was used
for Reach HB3 to address historic straightening and irregular banks resulting from cattle impacts.
The design approach included meandering the channel within the natural valley and backfilling the
existing stream.
Reach HB4 (STA 36+84 to STA 42+63; STA 42+63 to 44+91) — Reach beginning at farm
crossing just downstream of Reach HB3 and flows north to its confluence with Hannah Creek. A
combination of Enhancement I and Preservation was used for Reach HB4 downstream of the
easement break. Enhancement I was used for over 500 feet beginning downstream of the easement
break, and Preservation was used for the channel from the Enhancement I section to the confluence
with Hannah Creek. The design approach included installing log structures at various points along
the channel to raise the channel invert within the upper section. Because the channel was previously
channelized and relocated to the west side of the valley, the structures allow flows to frequently
inundate the valley floor and existing wetlands located to the east. A floodplain bench was also
constructed along the left bank within the enhancement section.
• Reach HF1 (STA 2+18 to STA 13+58; STA 13+58 to 16+04) — Reach beginning in a forested
area in the southern portion of the project and flows north until its confluence with Reach BB 1
totaling 1,386 linear feet. Preservation was used for Reach HF1 because the majority of the channel
is stable throughout the easement and provides a variety of aquatic habitats.
• Reach HF2 (STA 6+40 to STA 7+89) — Reach beginning in agricultural field in the southern
portion of the project and flows north until its confluence with Reach HF1 totaling 149 linear feet
of Preservation.
Reach TH3 (STA 0+63 to STA 7+79) — Reach begins just downstream of disturbed wetlands and
an existing farm crossing located at the top of the project. The reach flows to the east into Hannah
Creek totaling 716 linear feet. Enhancement Level I was used on Reach TH3. The design approach
on this reach focused on improving the riparian buffer and in -stream habitat and floodplain
benching. Construction activities included cutting a floodplain bench along the south side of the
channel along the upper reach and installing grade control and woody debris structures throughout
to improve vertical stability and aquatic habitat.
Wetland
The Site offers a total ecosystem restoration opportunity. As such, the wetland restoration and enhancement
is closely tied to the stream restoration. The Site provides 10.73 WMUs through a combination of wetland
restoration, enhancement, and preservation treatments.
Hannah Bridge 5 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

Because of the soil characteristics and variations observed throughout the site, the primary wetland
restoration activities, at a 1:1 credit ratio, were plugging the existing channel and constructing a stream
channel at a higher elevation that elevates shallow groundwater depths and more frequently floods adjacent
wetlands. Additional backfilling to create shallow depressions within the old channel and removal of spoil
from pond excavation along the floodplains aids in the restoration of a natural floodplain surface relative
to the surrounding landscape. Surface roughening and creation of shallow depressions throughout the
restoration area provides an appropriate landscape for diverse habitat. Due to compaction and long term
agricultural use, a shallow ripping of the surface to a depth of 6 to 8 inches was called for to allow adequate
porosity for infiltration and storage and provide microtopographic relief.
Wetland enhancement is located along the floodplains of the stream restoration and enhancement reaches
within the jurisdictional wetland areas. The construction of a farm pond had altered surface drainage and
placed spoil across the floodplain. As part of the wetland enhancement, this pond was removed, and
hydrology was redirected towards the forested and grazed wetlands. The existing pasture areas on the Site
were treated with wetland enhancement at a credit ratio of 2:1. A credit ratio of 3:1 was used for the grazed,
forested wetland areas. The wetland mitigation treatment was primarily re -planting the disturbed pastures
as forested wetlands and excluding livestock from the pasture and grazed forested wetlands. Enhancement
activities included: reconnecting low-lying areas of hydric soil with the floodplain, farm pond removal,
planting native tree and shrub species commonly found in small stream swamp ecosystems, and surface
roughening to increase infiltration and storage. For the pond removal, the pond will be drained before
breaching the dam and removing all existing PVC pipe. Per direction of the engineer, it is expected that
excess spoil from the project will be placed within the existing pond footprint.
1.6 Construction and As Built Conditions
Stream construction and planting was completed in May 2019. The Hannah Bridge Mitigation Site was
built to design plans and guidelines. Project credits are based on design centerline, but as -built stream
lengths are shown on Table 1. The as -built survey is attached in the Baseline Monitoring Report and
includes a redlined version.
1.7 Year 3 Monitoring Performance (MY3)
The Hannah Bridge Year 3 Monitoring activities were performed in June and September 2021. All Year 3
Monitoring data is present below and in the appendices. The majority of the Site is on track to meeting
vegetation, stream, and wetland interim success criteria.
Vegetation
Monitoring of the 17 fixed vegetation plots (VP) and three random vegetation plots (RVP) was completed
during September 2021. Vegetation data are in Appendix C, associated photos are in Appendix B, and
plot locations are in Appendix B. MY3 monitoring data indicates that 19 of 20 plots are exceeding the
interim success criteria of 320 planted stems per acre. Planted stem densities ranged from 202 to 1,174
planted stems per acre with a mean of 643 planted stems per acre across all plots. A total of 17 species were
documented within the plots. Volunteer species were reported in 11 plots. The average planted stem height
was 7.4 feet. RVP 2 did not meet the interim success criteria. The area in and around this plot will be
supplemental planted this dormant season.
Visual assessment of vegetation outside of the monitoring plots indicates that the herbaceous vegetation is
becoming well established throughout the project. RES performed supplemental planting of about 600
bareroot trees in January 2021. This planting occurred in and around VP 8, 11, 16, and 17 and MY2 RVP
Hannah Bridge 6 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

2 and 3. Additional areas of Chinese privet re -sprouts were reported in MY3 totaling about 3 acres. These
areas will be treated in late 2021 or 2022. RES did not observe any easement encroachment and all fencing
was in good condition. Problem area photos are in Appendix B.
Stream Geomorphology
Geomorphology data for MY3 was collected during June 2021. Summary tables and cross section plots are
in Appendix D. Overall, the MY3 cross sections relatively match the MY0 cross sections. The MY3
conditions show that shear stress and velocities have been reduced for all restoration/enhancement reaches.
All reaches were designed as sand bed channels and remain classified as sand bed channels.
Visual assessment of the stream channel was performed to document signs of instability, such as eroding
banks, structural instability, or excessive sedimentation. The channel is transporting sediment as designed
and will continue to be monitored for aggradation and degradation.
Stream Hydrology
During MY3, bankfull events were recorded on all three stage recorders. Stage Recorder HB1 recorded
eight with a maximum event of 1.23 feet, Stage Recorder HB3 recorded 10 with a maximum event of 1.18
feet, and Stage Recorder HB4 recorded nine with a maximum event of 1.30 feet. The flow gauge on TH3
recorded 133 consecutive flow days and 221 cumulative flow days. Gauge locations are on Figure 2 and
the associated data is in Appendix E.
Wetland Hydrology
During MY3, six of 13 groundwater wells (GW) and one of the two reference groundwater wells (RGW)
met the 12 percent hydroperiod success criteria. Hydroperiods of the 13 groundwater wells ranged from
one to 74 percent and the two reference groundwater wells ranged from eight to 39 percent. Four of the 13
wells were less than five percent, three were between five and 12 percent, and five were greater than 12
percent. RES installed GW12 and GW13 in Wetland 14 in February 2021 to provide additional data. RES
expects the groundwater wells to continue to improve; however, considers GW6, 8, and 13 "at -risk" due to
consecutive years of hydroperiods less than five percent. These wells will continue to be monitored and if
low hydroperiods continue RES will explore other options including potentially converting wetland to
buffer/nutrient credit. Groundwater well locations can be found on Figure 2 and the associated data is in
Appendix E.
2.0 Methods
Stream monitoring was conducted using a Topcon GTS-312 Total Station. Three-dimensional coordinates
associated with cross-section data were collected in the field (NAD83 State Plane feet FIPS 3200).
Morphological data were collected at 20 cross -sections. Survey data were imported into CAD, ArcGIS®,
and Microsoft Excel® for data processing and analysis. The stage recorders include an automatic pressure
transducer flow gauge and a manual crest gauge. The flow gauges were installed within the channel and
will record flow conditions at an hourly interval. The manual crest gauges were installed on the bank at the
bankfull elevation. During quarterly visits to the Site, the height of the corkline will be recorded. Automatic
pressure transducer data from the flow gauges will be corrected using bankfull recordings from the crest
gauges to produce the stage of the channel at hourly intervals. The stage recorder on HB4 does not have a
manual crest gauge and the bankfull events are reported using the elevation of the top of bank. The flow
gauge on the intermittent stream is corrected using the elevation of the downstream riffle to detect stream
flow.
Hannah Bridge 7 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

Vegetation success is being monitored at 17 fixed vegetation plots and three random vegetation plots.
Vegetation plot monitoring follows the CVS-EEP Level 2 Protocol for Recording Vegetation (Lee et al.
2008) and includes analysis of species composition and density of planted species. Data are processed using
the CVS data entry tool. In the field, the four corners of each plot were permanently marked with PVC at
the origin and metal conduit at the other corners. Photos of each plot are to be taken from the origin each
monitoring year. The random plots are to be collected in locations where there are no fixed vegetation plots.
Random plots will most likely be collected in the form of 100 square meter belt transects with variable
dimensions. Tree species and height will be recorded for each planted stem and the transects will be mapped
and new locations will be monitored in subsequent years.
Wetland hydrology is monitored to document success in wetland restoration and enhancement areas (as
requested by NCIRT). This is accomplished with 13 automatic pressure transducer gauges (located in
groundwater wells) that record daily groundwater levels. Ten have been installed within the wetland
crediting area and two within reference wetland areas. One automatic pressure transducer is installed above
ground for use as a barometric reference. Gauges are downloaded quarterly and wetland hydroperiods are
calculated during the growing season. Well installation followed current regulatory guidance. Visual
observations of primary and secondary wetland hydrology indicators are also recorded during quarterly site
visits.
Hannah Bridge 8 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

3.0 References
Environmental Laboratory. 1987. U.S. Army Corps of Engineers Wetlands Delineation Manual,
Technical Report Y-87-1. U.S. Army Engineer Waterways Experiment Station, Vicksburg, Mississippi.
Harman, W., R. Starr, M. Carter, K. Tweedy, M. Clemmons, K. Suggs, C. Miller. 2012. A Function -
Based Framework for Stream Assessment and Restoration Projects. US Environmental Protection
Agency, Office of Wetlands, Oceans, and Watersheds, Washington, DC EPA 843-K-12-006.
Lee Michael T., Peet Robert K., Roberts Steven D., and Wentworth Thomas R., 2008. CVS-EEP Protocol
for Recording Vegetation Level. Version 4.2
North Carolina Division of Mitigation Services (NCDMS). `Broad River Basin Restoration Priorities
2009." (September 2014).
Peet, R.K., Wentworth, T.S., and White, P.S. (1998), A flexible, multipurpose method for recording
vegetation composition and structure. Castanea 63:262-274
Resource Environmental Solutions (2018). Hannah Bridge Stream and Wetland Mitigation Site Final
Mitigation Plan.
Rosgen, D. (1996), Applied River Morphology, 2nd edition, Wildland Hydrology, Pagosa Springs, CO.
Schafale, M.P. 2012. Classification of the Natural Communities of North Carolina, Third Approximation.
North Carolina Natural Heritage Program, Division of Parks and Recreation, NCDENR, Raleigh, NC.
US Army Corps of Engineers (USACE), 2003. April 2003 NC Stream Mitigation Guidelines.
U.S. Army Corps of Engineers (USACE). 2010. Regional Supplement to the Corps of Engineers Wetland
Delineation Manual: Atlantic and Gulf Coastal Plain Region (Version 2.0), ed. J. S. Wakeley, R. W.
Lichvar, and C. V. Noble. ERDC/EL TR-10-20. Vicksburg, MS: U.S. Army Engineer Research and
Development Center.
US Army Corps of Engineers (USACE), 2016. Wilmington District Stream and Wetland Compensatory
Mitigation Update.
Hannah Bridge 9 Year 3 Monitoring Report
Stream and Wetland Mitigation Site September 2021

Appendix A
Background Tables

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Table 2. Project Activity and Reporting History
Hannah Bridge Stream and Wetland Mitigation Site
Elapsed Time Since grading complete: 2 years 5 months
Elapsed Time Since planting complete: 2 years 5 months
Number of reporting Years : 3
Activity or Deliverable
Data Collection
Complete
Completion or
Delivery
Mitigation Plan
NA
Jun-18
Final Design — Construction Plans
NA
Jul-18
Stream Construction
NA
Apr-19
Site Planting
NA
Apr-19
As -built (Year 0 Monitoring — baseline)
May-19
May-19
Year 1 Monitoring
Nov-19
Dec-19
Supplemental Planting
NA
Apr-20
Invasive Species Treatment
NA
May-20
Invasive Species Treatment
NA
Oct-20
Year 2 Monitoring
XS: Jul-20
VP: Sep-20
Sep-20
Supplemental Planting
NA
Jan-21
Year 3 Monitoring
XS: June-21
VP: Se -21
Sep-21
Year 4 Monitoring
Year 5 Monitoring
Year 6 Monitoring
Year 7 Monitoring
= The number of reports or data points produced excluding the baseline

Table 3. Project Contacts Table
Hannah Bridge Stream and Wetland Mitigation Site
Designer
WK Dickson and Co., Inc. / 720 Corporate Center Dr., Raleigh,
NC 27607
Primary project design POC
Ben Carroll [phone]
Construction Contractor
KBS Earthwork Inc. / 5616 Coble Church Rd., Julian, NC
27283
Construction contractor POC
Kory Strader [phone]
Survey Contractor
Matrix East, PLLC / 906 N. Queen St., Suite A, Kinston, NC
28501
Survey contractor POC
James Watson, PLS
Planting Contractor
H&J Forestry
Planting contractor POC
Matt Hitch
Seeding Contractor
KBS Earthwork Inc. / 5616 Coble Church Rd., Julian, NC
27283
Contractor point of contact
Kory Strader [phone]
Seed Mix Sources
Green Resource [phone]
Nursery Stock Suppliers
Arborgen [phone]
Monitoring Performers
RES / 3600 Glenwood Ave, Suite 100, Raleigh, NC 27612
Stream Monitoring POC
Ryan Medric [phone]
Vegetation Monitoring POC
Ryan Medric [phone]
Wetland Monitoring POC
JRyan Medric [phone]

Table 4. Project Background Information
Project Name
Hannah Bridge
County
Johnston
Project Area (acres)
46.2
Project Coordinates (latitude and longitude)
Latitude: 35.4754 N Longitude:
-78.3117 W
Planted Acreage (Acres of Woody Stems Planted)
27.53
Project Watershed Summary Information
Physiographic Province
Coastal Plain
River Basin
Neuse
USGS Hydrologic Unit 8-digit
03020201
USGS Hydrologic Unit 14-digit
3020201150020
DWR Sub -basin
03-04-02
Project Drainage Area (Acres and Square Miles)
894 ac (1.39 sgmi)
Project Drainage Area Percentage of Impervious Area
<2%
CGIA Land Use Classification
Agriculture (54%) Forest (39%) Residential (5%)
Reach Summary Information
Parameters
H131
H132
HB3
HB4
HF1
HF2
TH3
Length of reach (linear feet)
1400
392
1807
807
1386
149
716
Valley confinement (Confined, moderately confined, unconfined)
UC
UC
MC
MC
MC
UC
MC
Drainage area (Acres and Square Miles)
667
752
816
894
78
13
24
Perennial, Intermittent, Ephemeral
P
P
P
P
P
I
I
NCDWR Water Quality Classification
WA
WA
WA
WA
WA
WA
WA
Stream Classification (existing)
E4/5
E4/5
E5
E5
E5
G6c
F5/G5c
Stream Classification (proposed)
E4/5
WA
E4/5
WA
WA
WA
WA
Evolutionary trend (Simon)
WA
WA
WA
WA
WA
WA
WA
FEMA classification
WA
I WA
WA
WA
WA
WA
WA
Regulatory Considerations
Parameters
Applicable?
Supporting
Docs?
Water of the United States - Section 404
Yes
SAW-2015-
01799
Water of the United States - Section 401
Yes
DWR # 17-
0537v2
Endangered Species Act
Yes
USFWS
(Corr. Letter)
Historic Preservation Act
Yes
SHPO (Corr.
Letter)
Coastal Zone Management Act (CZMA or CAMA)
No
N/A
FEMA Floodplain Compliance
Yes
N/A
Essential Fisheries Habitat
No
N/A

Webb Mill
Blackmon Rd
Legend
bb
Conservation Easement
CCPV Index Sheet
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3
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Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri
Oak Fares Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC,
Fares,
contributors, and the.GIS `U'ser Community
N
Date: 9/28/2020
Figure 1 - Site Location Map
w E ryes
Hannah Bridge Site Drawn by: RTM
s Checked by: BPB
0 500 1,000
Johnston County, North Carolina
1 inch = 2,000 feet
Feet

Appendix B
Visual Assessment Data

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Vegetation Plot 7 (09/07/2021)
Vegetation Plot 9 (09/07/2021)
Vegetation Plot 11 (09/07/2021)
Vegetation Plot 8 (09/07/2021)
Vegetation Plot 10 (09/07/2021)
Vegetation Plot 12 (09/07/2021)

Vegetation Plot 13 (09/07/2021)
Vegetation Plot 15 (09/07/2021)
Vegetation Plot 17 (09/07/2021)
Vegetation Plot 14 (09/07/2021)
Vegetation Plot 16 (09/07/2021)

i t

Hannah Bridge Monitoring Device Photos
Groundwater Well 12( AQO q
\ .�
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Groundwater Well !J(2AQO q

Stream Problem Areas
Hannah Bridge
Feature Issue / Location Photo
N/A N/A
Vegetation Problem Areas
Hannah Bridge
Feature Category / Location / Size
Photo
Invasive Species / W14 / 0.30 acres
r
Invasive Species / HB1 / 0.66 acres
ems'
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Invasive Species / W6 / 2.10 acres

Appendix C
Vegetation Plot Data

Appendix C. Vegetation Assessment Data
Table 5. Planted Species Summary
Common Name
Scientific Name
Total Stems Planted
Water Oak
Quercus nigra
5,500
Overcup Oak
Quercus lyrata
4,000
Bald Cypress
Taxodium distichum
3,500
Sycamore
Platanus occidentalis
3,500
Willow Oak
Quercus phellos
3,000
Swamp Chestnut Oak
Quercus michauxii
2,400
Green Ash
Fraxinus pennsylvanica
2,200
Tuliptree
Liriodendron tulipifera
2,000
River Birch
Betula ni ra
1,600
Buttonbush
Cephalanthus occidentalis
1,500
Cherrybark Oak
Quercus pagoda
1,100
Blackgum
Nyssa sylvatica
600
Silky Dogwood
Cornus amomum
500
Total
31,400
Table 6. Vegetation Plot Mitigation Success Summary
Plot #
Planted
Stems/Acre
Volunteer
Stems/Acre
Total
Stems/Acre
Success
Criteria
Met?
Average
Stem
Height (ft)
1
850
486
1335
Yes
6.8
2
850
0
850
Yes
8.3
3
1 647
202
850
Yes
4.8
4
1093
283
1376
Yes
8.6
5
809
647
1457
Yes
3.9
6
688
243
931
Yes
10.9
7
728
0
728
Yes
7.9
8
364
121
486
Yes
7.7
9
769
0
769
Yes
9.6
10
567
324
890
Yes
7.6
11
324
0
324
Yes
5.4
12
688
162
850
Yes
8.3
13
890
0
890
Yes
8.8
14
567
0
567
Yes
6.6
15
526
81
607
Yes
5.1
16
324
283
607
Yes
4.8
17
445
121
567
Yes
8.7
R1
1174
0
1174
Yes
6.3
R2
202
0
202
No
8.2
R3
364
0
364
Yes
8.1
Project Avg
643
147
791
Yes
7.4

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Appendix E
Hydrology Data

Table 10. 2021 Rainfall Summary
Average
Normal Limits
JoCo Aiport Station
Precipitation
30 Percent
70 Percent
January
4.24
3.24
4.93
4.32
February
3.64
2.51
4.34
4.89
March
4.57
3.44
5.33
2.10
April
3.24
1.99
3.92
0.58
May
4.17
2.91
4.96
1.60
June
4.14
2.70
4.97
5.14
July
5.43
3.48
6.53
7.27
August
4.58
3.05
5.49
2.93
September
4.54
2.26
5.55
0.13
October
3.16
1.89
3.81
---
November
2.95
1.86
3.55
---
December
3.05
2.02
3.65
---
Total
47.71
31.35
57.03
28.96
Above Normal Limits
jBelowofNonnalLimits
Table 11. Documentation of Geomorphically Significant Flow Events
Number of Bankfull
r Events
Maximum Bankfull
Height (ft)
Date of Maximum Bankfull
Event
Photo Number
Stage Recorder HB1
MY12019
2
0.50
9/5/2019
MYl
MY2 2020
5
1.30
8/ 15/2020
N/A
MY3 2021
8
1.23
7/ 19/2021
N/A
Stage Recorder HB3
MY12019
3
0.99
9/6/2019
MYl
MY2 2020
8
1.67
2/7/2020
N/A
MY3 2021
10
1.18
7/ 19/2021
N/A
Stage Recorder HB4
MY12019
1
1.75
9/6/2019
N/A
MY2 2020
12
3.53
2/7/2020
N/A
MY3 2021
9
1.30
2/20/2021
N/A
Year
Number of Consecutive Flow Days
Total Number of Flow Days
Consecutive Flow Day Date
Range
Max FlowGrau eTH3
MY12019
0
0
---
MY2 2020
200
250
---
MY3 2021
133
221
1/ 1/2021-5/ 14/2021

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Table 12.
2021 Max Hydroperiod (Growing Season 18-Mar through 6-Nov, 233 days)
Success Criterion 12%
Consecutive
Cumulative
Well ID
Days
Hydroperiod
%
Da
Da s
ys
Hydroperiod
Occurrences
GW1
9
4
56
24
17
GW2
21
9
55
23
11
GW3
32
14
79
34
13
GW4
68
29
140
60
8
GW5
173
74
173
74
1
GW6
2
1
10
4
9
GW7
31
13
53
23
7
GW8
5
2
32
14
16
GW9
20
8
78
33
11
GW10
19
8
49
21
12
GWI1
31
13
81
35
13
GW12
32
14
59
25
8
GW13
4
2
14
6
9
RGWI
19
8
35
15
8
RGW2
91
39
157
67
2
Table 13.
Summary of Groundwater Monitoring Results
Hannah Bridge
H dro eriod % ; Success Criteron 12%
We ll
Wetland ID
Year 1
2019
Year 2
2020
Year 3
2021
Year 4
2022
Year 5
2023
Year 6
2024
Year 7
2025
GW1
W1
2
3
4
GW2
W4
9
8
9
GW3
W4
18
13
14
GW4
W6
30
35
29
GW5
W5
100
81
74
GW6
W14
2
1
1
GW7
W14
1
3
13
GW8
W14
1
3
2
GW9
W14
1
4
8
GW10
W10
1 3
5
8
GW11
W1
2
9
13
GW12
W14
NA
NA
14
GW13
W14
NA
NA
2
RGW1
W3
17
9
8
RGW2
W3
27
26
39
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