20181273 Ver 1_Year 3 Monitoring Report Proposed Repairs_20230731

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WILDLANDS
ENGINEERING
MEMORANDUM
TO: 401 Permit Reviewer
FROM: Carolyn Lanza, Wildlands Engineering
DATE: July 7, 2023
RE: Project Repair Plan - Supporting Documentation
BUG HEADWATERS MITIGATION SITE
Wilkes County, NC
On behalf of the North Carolina Department of Mitigation Services (NCDMS), Wildlands Engineering, Inc.
(Wildlands) is requesting a new water quality certification for an existing stream mitigation project in
Wilkes County, NC. The Bug Headwaters Mitigation Site was originally permitted in November of 2020
under the NC Division of Water Resources (NCDWR) Water Quality General Certification Number 4134
and the US Army Corps of Engineers (USACE) Nationwide Permit Number 27. The project was
constructed between January and April of 2021.
Minor repairs are now needed for this mitigation site and the previous water quality certification for the
project has expired. The repairs are relatively minor and will be permitted by the USACE under the
Nationwide Permit Number 3. However, we have been informed by NCDWR that a new water quality
certification will be needed. A repair plan for the project site is attached to this memo. Most of the
repairs are simply replacing structures that were originally constructed but have become damaged and
repairing bank erosion. One repair on UT2A Reach 1 reconstructing a short (119 LF) section of the bed
of the channel which was originally not reconstructed (it was for enhancement II credit). Significant bed
erosion has occurred since construction and the bed of this section needs to be reconstructed to make it
stable. In total, the repairs will be constructed on 434 linear feet of the project. The total length of the
original project is 8,700 LF (MYO Annual Report, October 2021).
We hope this water quality certification for the repair work can be processed in a timely manner. If you
have additional questions or need more information about the repair plan to issue the new water
quality certification, please do not hesitate to contact me at 313-969-7318 or at
[e-mail] should you have any questions.
Sincerely,
carcn cnza
Carolyn Lanza
Environmental Scientist

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i Conservation Easement Stream Restoration — Cross -Sections
Internal Crossing Stream Enhancement I — Proposed Repairs
JExisting Wetlands Stream Enhancement II C Reach Breaks
— Ephemeral Step -Pool BMP No Credit 0 Photo Points
® Pocket Wetland BMP --- As -Built Bankfull ♦ Barotroll
-- Vegetation Plot Condition - MY2 s = ,a Fence ♦ Flow Gauge
Criteria Met- Fixed _—_ Utility Line Structures
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ENGWILDLANDS
INEERING
0 150 300 Feet A
IIIIII
Figure 1a. Current Condition Plan View
Bug Headwaters Mitigation Site
DMS Project No. 100084
Monitoring Year 3 - 2023
Wilkes County, NC

r , Conservation Easement
---
As -Built Bankfull
Internal Crossing
N =
Fence
Existing Wetlands
x —
x New Fence
Vegetation Plot Condition -MY2
_—_
Utility Line
Criteria Met - Fixed
Cross -Sections
- Criteria Not Met - Fixed
Proposed Repairs
• Criteria Not Met - Random
0
Reach Breaks
Stream Restoration
0
Photo Points
Stream Enhancement I
Crest Gauge
Stream Enhancement 11
Flow Gauge
No Credit
Structures
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October Data
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October Data
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Riffle material washed
away &eroded banks
L/awa
e material washed
_/y & eroded banks
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�AWILDLIANDS 0 150 300Feet / ENGNEERING
I i I i I
UT2
Reach 3
Big Bugaboo
Reach 2
Figure 1b. Current Condition Plan View
Bug Headwaters Mitigation Site
DMS Project No. 100084
Monitoring Year 3 - 2023
Wilkes County, NC

i Conservation Easement
— Stream Restoration
--- Utility Line
Internal Crossing
— Stream Enhancement I
Cross -Sections
Existing Wetlands
— Stream Enhancement 11
Proposed Repairs
Vegetation Plot Condition - MY2
— No Credit
C Reach Breaks
Criteria Met - Fixed
_—_ As -Built Bankfull
0 Photo Points
- Criteria Not Met - Fixed
_ Fence
Crest Gauge
Criteria Met - Random
x — x New Fence
Structures
• Criteria Not Met- Random
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tober Data
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October Data
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ENGINEERING
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October Data
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Eroded banks 5r
Eroded right bank
Riffle material washed away,
^ �., �,'� ♦ two eroded log sill
& eroded banks
as'4,Left bank scour
{ N
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F:
0 150 300 Feet A
IIIIII I•I�gl,
Figure 1c. Current Condition Plan View
Bug Headwaters Mitigation Site
DMS Project No. 100084
Monitoring Year 3 - 2023
Wilkes County, NC

Stream Area of Concern Photographs

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Big Bugaboo Creek R3 STA 120+25—120+55 — Riffle
Big Bugaboo Creek R3 STA 125+44—125+68 — Riffle material
material washed away and eroded banks (05/02/2023)
washed away & eroded bank (05/09/2023)
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�T;��"tea ih;• �
Big Bugaboo Creek R3 STA 137+55—137+75 — Eroded right bank
Big Bugaboo Creek R4 STA 138+60—138+80 — Riffle material
below log sill (05/09/2023)
washed away and eroded banks (11/17/2022)

Big Bugaboo Creek R4 STA 138+60—140+33 — Eroded banks Big Bugaboo Creek R4 STA 139+55 — Eroded log sill
(05/09/2023) , (05/09/2023)
Big Bugaboo Creek R4 STA 141+20—141+30 — Scouring left
bank(05/02/2023)
UT2 R3 STA 307+30 — 307+50 — Riffle material washed out
(05/02/2023)

UT2A R1 STA 400+00 — 401+19 — Downcutting Ell section
(11/17/2022)
UT2A R1 STA 400+55 — 400+70 — Eroded left bank (11/17/2022)