20060447 Ver 3_Year 2 Monitoring Report_20230123

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Monitoring Year 2 Report
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STREAM AND VEGETATION MONITORING
YEAR 2 REPORT
OLDE TOWNE STRE„M RELOCATIO
J
MCADAMS
- 18020 /JANUARY 2023

OLDE TOWNE STREAM RELOCATION
RALEIGH, NORTH CAROLINA
STREAM AND VEGETATION MONITORING
YEAR 2 REPORT
PROJECT NUMBER: HLE-18020
PREPARED BY: REBECCA STUBBS, PE
DATE: JANUARY 2023
1 1
McADA M S
621 HILLSBOROUGH STREET
SUITE #500
RALEIGH, NC 27603
NC LIc. # C-0293

J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
TABLE OF CONTENTS
1.0 INTRODUCTION.......................................................................................................................................2
1.1 Project Location and Description......................................................................................................2
1.2 Project Goals and Objectives............................................................................................................2
2.0 CHANNEL STABILITY ASSESSMENT..........................................................................................................2
2.1 Channel Stability Success Criteria.....................................................................................................2
2.2 Stream Assessment Summary...........................................................................................................3
3.0 VEGETATION CONDITION AND COMPARISON........................................................................................4
3.1 Vegetation Success Criteria...............................................................................................................4
3.2 Visual Vegetation Assessment Summary..........................................................................................4
4.0 CONCLUSION...........................................................................................................................................4
4.1 Adaptive Management..................................................................................................................4
4.2 Year 1 Monitoring Summary.............................................................................................................4
5.0 REFERENCES.............................................................................................................................................5
Appendix A: Site Maps
Figure 1: Site Vicinity Map
Figure 2: Site Stream Relocation Vicinity Map
Figure 3: As -built Survey Map
Appendix B: Stream Data
Appendix C: Site Photo Log
creating experiences through experience 621 Hillsborough Street, Suite 500, Raleigh, NC 27603 / 919. 361. 5000

WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
1.0 INTRODUCTION
1.1 Project Location and Description
The Olde Towne Stream Relocation project is a permitee-responsible mitigation project located north-east of the
intersection of S. New Hope Road and Rock Quarry Road in Raleigh, North Carolina. As part of the development
of the 574-acre Olde Towne master planned community. Rock Quarry Road south of the S. New Hope Road
intersection was widened, creating 351 linear feet of impact to an unnamed tributary (UT) to Big Branch. The Olde
Towne Stream Relocation project realigned and restored 369 linear feet of UT to Big Branch impacted by the
widening of Rock Quarry Road. The constructed channel departs from the historic channel alignment
approximately 650 feet south-east of the intersection and reconverges with the historic alignment approximately
250 feet south-east of the intersection, downstream of the proposed impacts. Approximately 230 feet
downstream of the restored reach, UT to Big Branch passes through a culvert beneath Rock Quarry Road,
daylighting south of the road in the floodplain of Big Branch (DWR stream index number 27-34-11). UT to Big
Branch is located in the Neuse River Basin USGS Hydrologic Unit 03020201 and local Walnut Creek watershed 12-
digit HUC 030202011101
1.2 Project Goals and Objectives
The purpose of this Stream and Vegetation Monitoring Report is to assess the success of the stream restoration
project. The monitoring plan evaluates the success of the Site and is based on the U.S. Army Corps of Engineers
(USACE) Stream Mitigation Guidelines (2016) and the North Carolina Ecosystem Enhancement Program (NCEEP)
Monitoring Requirements and Performance Standards for Stream and/or Wetland Mitigation (November, 2011).
Monitoring of the Site will occur annually for three (3) years.
Construction of the Stream Restoration project occurred in February and March of 2021. Riparian buffer planting
took place from April to June 2021 following construction of the restored stream channel. Riparian buffer planting
activities included permanent wetland and riparian seeding, stream plantings, and live stakes within the project
limits of disturbance.
The restored stream was designed to have natural channel dimension, pattern, profile, and vegetation based on
regional data. The stream was relocated and connected to the surrounding forested floodplain using a "Priority
One" restoration approach. of grading the channel so that bankfull stage (incipient flooding) was at the elevation
of the existing floodplain area with minor floodplain grading to provide sufficient flood prone area width to
dissipate hydraulic energy during bankfull and greater flood events. This geomorphic condition will be sustained
by increased sinuosity, creation of a stable slope, and grading appropriate channel depth and width for stability,
thereby reducing bankfull shear stress and velocity. Stream longitudinal profile and bedform diversity were
improved with the design of riffle and pool sequences and incorporation of log structures for habitat diversity and
grade control. The streambanks and surrounding floodplain will be planted extensively with native riparian and
wetland vegetation to establish a native forested riparian plant community.
2.0 CHANNEL STABILITY ASSESSMENT
2.1 Channel Stability Success Criteria
Stream geometry will be considered successful if the geometry, profile, and sinuosity are stable or reach a dynamic
equilibrium. It is expected that there will be minimal changes in the designed cross sections, profile, and/or
substrate composition. Changes that may occur during the monitoring period will be evaluated to determine if
they represent a movement toward a more unstable condition (e.g. down cutting, or bank erosion) or are minor
changes that represent an increase in stability (e.g. settling, vegetative changes, etc.). Deviation from the design
creating experiences through experience Page 2 of 5

WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
ratios will not necessarily denote failure as it is possible to maintain stability and not stay within the design
geometry.
Channel stability will be reflected in the surveyed permanent cross sections, evaluation of bank stability and cover,
evaluation of in -stream structure performance and any previously collected monitoring data. The general trend
should reflect a stable or slightly decreasing riffle cross sectional area whereas pools may increase and yet be
considered relatively stable. Normally the constructed channel will adjust (especially in a sand dominated bed)
but it will need to function without significant degradation (bed scour), aggradation (mid -channel bars), or bank
erosion.
The Bank Height Ratio (BHR) as determined by cross section surveys, shall not exceed 1.2 and the Entrenchment
Ratio shall be no less than 2.2 within the restored reach. The stream shall remain stable over the three-year
monitoring period as indicated by visual surveys and cross sections.
2.2 Stream Assessment Summary
Channel stability monitoring activities for Year 1 were conducted during May 28, 2021 (As -built survey), July 7,
2021 (MY1), December 17, 2021 (MY1), and December 16, 2022 (MY2). Visual stream assessments were
performed during each visit and geometric parameters were collected during the May 2021 and December 2021
field visits. Per the monitoring plan geometry data will be collected 1 year after construction (2021) and three
years after construction (2023). Therefore, monitoring activities during 2022 consisted only of visual stability
assessment. Overall, the stream system appears stable and is not migrating toward lateral or vertical instability.
Visual stream assessments were performed along the entirety of the restored reach. A few areas of bank instability
noted in Monitoring Year 1 (MY1) were concentrated in the upper portion of the restoration reach, however
appeared to be generally stable in the MY2 site walk. This is likely attributed to the abundance of vegetation
present on the banks throughout the reach, preventing continued bank scour. A tree root has created an
approximate 1' drop and scour pool immediately downstream at approximately station 1+00. This root is
essentially functioning as a log sill grade control structure and was observed in a near bankfull event and in low
flow conditions. The root sill has resulted in some slight downcutting and increased bank heights to 3 feet
extending about 50 linear feet downstream, however bank heights return to 2 feet after the next meander bend.
While banks are slightly taller, it appeared as though bankfull and greater events retained access to the adjacent
floodplain and no significant bank scour was observed.
In MY1, moderate right bank scour was observed at station 1+75 at the entrance of a pool (see Photo Log in
Appendix C). The right bank at this station has experienced erosion and has deposited into the middle of the
channel. At this station and the outside meander bend (right bank) of the pool has bare vegetation and bankfull
indicators were located inside the banks. In MY2 observation, this streambank appeared to be stable and not
causing additional instability. A large tree on the left bank of the stream has fallen near station 2+60. Its root wad
had previously formed the restored stream's left bank and that has been pulled up and away (see Photo Log in
Appendix C). While this has altered channel geometry significantly, widening the channel and creating a scour
pool, no additional instability was observed in channel function outside of the immediate area. It is recommended
that the tree be removed and bank be re-established in this area.
Evidence of bankfull was observed along most of the design reach, through presence of rack lines and matted
native grasses along the top of bank and within the floodplain areas. During the December 21, 2022 site visit, the
base flow of the stream was observed to have good clarity. Substrate of the stream appeared to be stable in that
depositional features were characterized by sand deposits on point bars in stable locations, and coarser material
observed in riffle sections. Log structures used for grade control along the reach are performing as designed,
maintaining approximately 6-inches of drop across each structure.
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J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
3.0 VEGETATION CONDITION AND COMPARISON
3.1 Vegetation Success Criteria
Vegetative success criteria will be based on the visual monitoring conducted twice annually. If there are no
significant bare areas or areas of dead vegetation at the end of the monitoring period, the project will be
considered successful. If any bare areas or areas of dead vegetation are noted during any of the visual inspections,
they will be addressed with supplemental seeding at that time.
3.2 Visual Vegetation Assessment Summary
MY2 vegetation assessment activities were conducted on December 16th and 215T 2022. Post -construction
plantings have also resulted in densely vegetated stream banks and floodplain areas primarily dominated by
herbaceous grasses. Few live stakes appeared to have survived with red maple saplings, most easily identifiable
during the December 2022 monitoring visits.
4.0 CONCLUSION
4.1 Adaptive Management
Overall, the restored reach appears to be stable. Sparse vegetation observed from MY1 has filled in and
contributed to maintaining stability of the stream on the banks and in the floodplain areas. Live stake survivability
should continue to be monitored for continued establishment in upcoming monitoring year. McAdams does
recommend additional live stake planting during appropriate planting window to promote long-term stability
provided by the root systems of woody vegetation. It is also recommended that fallen trees be removed near
station 2+60 and the left streambank be reformed to prevent potential channel instability resulting from the cavity
created. Silt fence and tree protection fence remains in the restoration area and should be removed to prevent
future conveyance or habitat issues.
4.2 Year 2 Monitoring Summary
The stream system appears stable and is not migrating toward lateral or vertical instability. There continues to be
evidence of floodplain connection and activation along most of the restored reach. McAdams will continue to
monitor the impact of upstream and surrounding construction activities on the restored channel.
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J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
5.0 REFERENCES
North Carolina Ecosystem Enhancement Program (NCEEP) 2004. Guidelines for Riparian Buffer Restoration. Available
at internet site: https://erp.unc.edu/files/2014/12/buffer-restoration.pdf.
North Carolina Ecosystem Enhancement Program (NCEEP) November 7, 2011. Monitoring Requirements and
Performance Standards for Stream and/or Wetland Mitigation.
The John R. McAdams Company, Inc. May 2021. Olde Towne As -Built Monitoring Report.
US Army Corps of Engineers April, 2013. Stream Mitigation Guidelines.
creating experiences through experience Page 5 of 5

APPENDIX A
SITE MAPS
OLDE TOWNE STREAM RELOCATION
MONITORING YEAR 2 REPORT

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VERSION: 1
DATE: 12/22/2021
McADAMS
JOB NO: HLE-18020
DRAWN BY: Garcia
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APPENDIX B
STREAM DATA
Cross sections to be surveyed and included in MY1
and MY3 reports. Visual assessment only MY2.
OLDE TOWNE STREAM RELOCATION
MONITORING YEAR 2 REPORT

APPENDIX C
SITE PHOTO LOG
OLDE TOWNE STREAM RELOCATION
MONITORING YEAR 2 REPORT

J MCADAMS
SITE PHOTO LOG
December 16, 2022
OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
Figure 1. Looking upstream at project start. Approximately Sta 0+25.
0 193°S (T) 0 35.738406,-78.566802 ±28ft A 86ft
Figure 2. Log sill #1 performing well in near-bankfull event.
creating experiences through experience 621 Hillsborough Street, Suite 500, Raleigh, NC 27603 / 919. 361. 5000

WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
Figure 3. Looking downstream. Showing red maple sapling and dense vegetation.
® 207°S (T) (0) 35.738756,
Figure 4. Area of bank slough near Sta 1+75, stabilized with vegetation and not negatively impacting stream flow.
creating experiences through experience 2 of 7

WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
December 21, 2022
Figure 5. Looking upstream at project start and log sill #1 in low flow.
Figure 6. View of naturally occurring root sill near Sta 1+00 with approximately 1' drop and small scour pool
immediately downstream.
creating experiences through experience 3 of 7

J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
Figure 7. View of channel substrate in riffle section.
Figure 8. Looking downstream at dense floodplain vegetation and stable stream alignment.
creating experiences through experience 4 of 7

J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
Figure 9. View of substrate of depositional feature (point bar).
Figure 10. View of fallen tree near Sta 2+60.
creating experiences through experience 5 of 7

J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
Figure 11. View of localized scour in root mass cavity.
Figure 12. View of log sill #2.
creating experiences through experience 6 of 7

J WADAMS OLDE TOWNE STREAM RELOCATION > MONITORING YEAR 2 REPORT
Figure 13. View of stream immediately downstream of project. Water clarity is good and banks are stable.
creating experiences through experience 7 of 7