Buckwater Repair Plan - MY5

MEMORANDUM

TO:    401 Permit Reviewer 

FROM:    Carolyn Lanza, Wildlands Engineering 

DATE:    July 7, 2023 

RE:    Project Repair Plan ‐ Supporting Documentation 
      BUCKWATER MITIGATION SITE 
      Orange 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 
Orange County, NC.  The Buckwater Mitigation Site was originally permitted in March of 2018 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 
April of 2018 and April of 2019. 

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.  In total, the repairs will be constructed on 238 linear feet of the project.  The 
total length of the original project is 16,276 LF (MY0 Annual Report, September 2019).   

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, 

Carolyn Lanza 
Environmental Scientist  
Buckwater Mitigation Site
DMS Project No. 97084
Monitoring Year 5 - 2023
Reach Start Station End Station Length (LF) Description Planned 2023 Management Action
314+20 314+30 10
Piping rock sill; souring left bank. Riffle
upstream of piping sill is stable and providing
grade control.
Remove rock sill and tamp down left bank.
314+40 314+70 30
Piping angled log riffle due to log sills being
improperly keyed in. Riffle material is
providing grade control.
Remove angled log riffle, rebuild as native riffle.
N/A Perched culvert due to piping rock sills
below.
408+42 409+20 78
Nine piping rock sills. Original construction of
rock sills were built upstream to downstream
preventing proper sealing of structures.
451+40 451+70 30
Six piping rock sills. Original construction of
rock sills were built upstream to downstream
preventing proper sealing of structures.
Rebuild rock sill structures downstream to
upstream.
453+00 453+50 50
Four piping log sills and two piping rock sills
due to erosion around log sills.
Rebuild structures and remove boulder toe along
banks.
T6 Reach 3 517+80 518+20 40
Four piping log sills due to erosion around
log sill.Remove log sills and replace with boulder sills.
Not applicable (N/A): Lengths not associated with instances (points)
Table 1. Areas of Concern and Management Actions
T4
T4B Reach 1
T3 Reach 2
408+42
Rebuild rock sill structures downstream to
upstream and remove boulder toe along banks.
!(
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!(
!(
!(
!(
!(
!(
!(
!(!(
!(
!(!(
!(
!(
!(
T4
T5
T8
T2
T3
Reach 1
Buckwater Creek
Reach 4
T6AT6
Reach 1
T7A
T6
Reach 3
T3
Reach 2
T6
Reach 2 T1 Reach 2
T6B
Buckwater Creek
Reach 7
T1
Reach 1
T7
Reach 3
T7
Reach 2
T7
Reach 1
T4B
Reach 1
T9
T4A
Reach 1
Buckwater Creek
Reach 1 T4A
Reach 3
T4A
Reach 2
Buckwater Creek
Reach 2
Buckwater Creek
Reach 8
Buckwater Creek
Reach 3
Buckwater Creek
Reach 6
Buckwater Creek
Reach 5
Figure 1. Integrated Current Condition Plan View
Buckwater Mitigation Site
DMS Project No. 97084
Monitoring Year 5 - 2023
Orange County, NC
¹0 800400 Feet
2021 Aerial Photography
Conservation Easement
Internal Crossing
Existing Wetlands
Stream Approach
Restoration
Enhancement I
Enhancement II
No Credit
Stream Areas of Concern
Utility Easement
!(Reach Breaks
Piping Log Sills
Piping Log Sills Piping Rock Sills and
Perched Culvert
Piping Rock Sills
Piping Log and
Rock SillsPiping Rock Sill

Stream Area of Concern Photographs

T3 R2 STA 314+20 - 314+30 – Piping Rock Sill (3/24/2023) T3 R2 STA 314+40 - 314+70 – Piping Angled Log Riffle
(3/24/2023)

T3 R2 STA 314+40 - 314+70 – Piping Angled Log Riffle
(3/24/2023)
T3 R2 STA 314+40 - 314+70 – Piping Angled Log Riffle
(3/24/2023)

T4 STA 408+42 – Perched Culvert (3/24/2023) T4 STA 408+42 – 409+20 – Piping Rock Sills (3/24/2023)

T4 STA 408+42 – 409+20 – Piping Rock Sills (3/24/2023) T4B R1 STA 451+40 – 451+70 – Piping Rock Sills (3/24/2023)

T4B R1 STA 451+40 – 451+70 – Piping Rock Sills (3/24/2023) T4B R1 STA 451+40 – 451+70 – Piping Rock Sills (3/24/2023)

T4B R1 STA 453+00 – 453+50 – Piping Log and Rock Sills
(3/24/2023)
T4B R1 STA 453+00 – 453+50 – Piping Log and Rock Sills
(3/24/2023)

T6 R3 STA 517+80 – 518+20 – Piping Log Sills (3/24/2023) T6 R3 STA 517+80 – 518+20 – Piping Log Sills (3/24/2023)

T6 R3 STA 517+80 – 518+20 – Piping Log Sills (3/24/2023)