Little Pine Creek Restoration II

From: Polizzi, Maria
To: Menefee -Dunn. Barbara A
Subject: Fw: [External] IRT Review Request: DMS Proposal for Little Pine Creek II Repairs / SAW-2009-00591 / Alleghany
County
Date: Monday, June 26, 2023 4:32:20 PM
Attachments: Little Pine Creek II 856 Concert Plan 2023.pdf
Little Pine Creek II 856 Concept Plan Map 2023.pdf
Outlook-2vai 1x3v. pna
Hi Barbara,
Here is another email w/ attachments for LF. Keep me posted when it's added so that I can update
my spreadsheet accordingly.
Project #: 2009-0048 (v.2)
Type: NCDMS
Date:6/21/23
Thanks for all your help!
Maria Polizzi
Stream and Wetlond Mitigation Coordinator
401 & Buffer Permitting Branch
Division of Water Resources, NCDEQ
Office: (919)-707-9083 Cell: (919)-815-4586
Email: maria.polizziPdeq.nc.gov
Address: 512 N. Salisbury St., Archdale Building 942-H, Raleigh, NC
US Mail: 1617 Mail Service Center, Raleigh, NC 27699-1617
From: Haywood, Casey M CIV USARMY CESAW (USA)<[e-mail]>
Sent: Wednesday, June 21, 2023 11:09 AM
To: Steve Kichefski <[e-mail]>; Tugwell, Todd J CIV USARMY CESAW (US)
<[e-mail]>; Isenhour, Kimberly T CIV USARMY CESAW (USA)
<[e-mail]>; Davis, Erin B CIV USARMY CESAW (USA)
<[e-mail]>; Youngman, Holland J <[e-mail]>; Polizzi, Maria
<[e-mail]>; Bowers, Todd <[e-mail]>; Leslie, Andrea J
<[e-mail]>; McHenry, David G <[e-mail]>; Wilson, Travis
W. <[e-mail]>
Cc: Wiesner, Paul <[e-mail]>; Tsomides, Harry <harry.tsomides@deq. nc.gov>; Xu,

Lin <[e-mail]>
Subject: [External] IRT Review Request: DMS Proposal for Little Pine Creek II Repairs / SAW-2009-
00591 / Alleghany County
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the
Report Message button located on your Outlook menu bar on the Home tab.
Good morning IRT,
During the NCDMS Credit Release Meeting, IRT requested to review the repair work proposed on
Little Pine Creek II. NCDMS is currently working on the repair work final design, bid document
preparation, and permitting. DMS will be awarding the project later this year with plans to start
construction repairs next spring (start of MY5 /2024) following the winter trout moratorium. DMS
will be applying for 404/401 (NWP 3) permits and DEMLR/Land Quality approval once the final
approved plans are received. A status update will be provided in the MY4 annual monitoring report
this fall/winter. No additional monitoring is being proposed at this time. Additionally, DMS will use
this opportunity to conduct additional containerized plantings in areas of low stem density and will
add larger stock containerized wetland plants as well. The species list will follow the approved
mitigation plan, or will be coordinated with the IRT.
The following items are attached for your review:
• Final Repair Conceptual Plan (KCI) with area descriptions, approaches, and photos
• Final Repair Concept Map with supplemental planting areas
Please provide any feedback regarding the attached proposal by July 06.2023.
Project Information:
Little Pine Creek II (DBB)
DMS Project # 856
Institution Date: 12/21/2007
New River Basin
Cataloging Unit 05050001
Alleghany County, North Carolina
USACE Action ID: SAW- 2009-00591
DWR# 2009-0048 (v.2)
MY4 (2023) Mitigation Project Credits:
3,195.000 SMU (cold)
1.484 WMU (riparian)
NCDEQ- DMS Project Manager: Harry Tsomides, [e-mail].g_ov, [phone]
Little Pine Creek 111 - April 2023 Credit Release meeting DMS Notes: Kim Isenhour (USACE)
asked about the reported stream issues on the site. DMS reported that KCI will be conducting o

repair plan on the site for IRT review and approval. Harry provided o mop showing the nine (9)
localized areas proposed for repair and discussed with the IRT. Kim noted that on AMP will not
be required but they would like to review the proposed work and DMS will need 4041401 (NWP
3) permits. The trout moratorium will also need to be considered. Kim noted that Little Pine
Creek Reaches 20 and 2b should be reviewed, and bore areas replanted os port of the repair
effort. Harry noted that the floodploin soils were poor in some areas due to post storm events
and scouring but indicated that DMS would review and odd supplemental planting to the site
os port of the repair. Kim asked about the foiled vegetation plots and the IRT recommended
larger plant stock or containerized plants in the herbaceous (Juncus) areas around Tributary C.
Harry noted that o section of Tributary C (lower) has recently developed oggrodotion issues
and that this reach will be monitored closely and cataloged appropriately. Kim asked about
the vernal pools on the site. Harry reported that the vernal pools dry up seasonally. The IRT
requested that o gouge summary data table be added to the report for the two GWGs. Kim
was complimentary of the project's report photos. Release os Proposed.
Thank you for your participation,
Casey
Casey Haywood
Mitigation Specialist, Regulatory Division I U.S. Army Corps of Engineers
[phone] work cell
BUILDING STRONG °
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third
parties by an authorized state official.

Concept Plan
Little Pine Creek II 2023 Repair
Alleghany County, North Carolina
DMS Project # 856
SCO Project # 23-26405-01A
Prepared by
KCI Associates of N.C., PA
4505 Falls of Neuse Road
Suite 400
Raleigh, NC 27609
[phone]
[phone]
K C I
ASSOCIATES OF NC
Prepared for
NCDEQ Division of Mitigation Services
217 West Jones St., Suite 3000A
Raleigh, N.C. 27603
[phone]
May 31, 2023

PROJECT DESCRIPTION
The North Carolina Division of Mitigation Services (DMS) has requested that KCI Associates of North Carolina,
P.A. (KCI) provide repair assessment, conceptual memo, repair plans, construction administration, and construction
oversight services at the Little Pine Creek II 2023 Site in the New River Basin, in Alleghany County, NC. The project
stream is Little Pine and multiple unnamed tributaries to Little Pine, which are located on an easement held by the
State of North Carolina.
SITE ASSESSMENT
KCI conducted an initial site assessment to investigate each potential repair area. This assessment included manual
and surveyed measurements and photo documentation at each location and an investigation at each repair area to
determine the likely causes of the issues and potential solutions. From this field assessment, KCI has created a concept
plan that addresses these multiple areas of instability. Eight areas of concern located throughout the project easement
were targeted for having varying degrees of bank erosion and bed instability.
REPAIR AREA 1:
Existing conditions
Repair Area 1 consists of outer bank erosion on the right bank, approximately from station 102+65 to 103+55. This
is caused by two factors. One being a high inner bank height which is currently forcing the streams energy to the right
bank. Secondly, the outer bank height ratio (BHR) starts off low at the beginning and increases as it rounds the bend.
Woody vegetation has not become established in this higher BHR area and this bank is experiencing slumping and
erosion.
Proposed approach
KCI proposes that the inner bank to be graded to a lower slope to reduce the energy along the outer bank. Additionally,
a live lift to be installed along the unvegetated portions of the outer bend. The live lift will consist of heavy coir fiber
matting and willow whips, along with a stone base for added toe stability. In addition, a 5-foot wide bench will be
installed along the live lift at a lower elevation to help minimize stresses during bankfull events and quickly establish
woody vegetation.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Repair Area 1: Outer bank erosion and slumping on the right bank.
REPAIR AREA 2:
Existing conditions
Repair Area 2 consists of outer bank erosion on the left bank, approximately from station 110+10 to 110+75, and a
failing boulder sill structure at station 110+75 where the stream thalweg is beginning to bypass to the left. The outer
bank has multiple large slumping areas that are actively eroding into the stream. The boulder structure lacks a bank
sill which is allowing the stream flows to migrate around the structure causing more erosion.
Proposed approach
KCI proposes that a live lift be installed along the entire outer bend of this reach. The live lift will consist of heavy
coir fiber matting and willow whips, along with a stone base for added toe stability. In addition, a 5-foot wide bench
will be installed to help minimize stresses during bankfull events. The boulder structure at station 110+75 is mostly
intact and KCI proposes that the sill be extended into the bank at least 5 feet to prevent flows from bypassing around
the structure.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Repair Area 2: Outer bank erosion and slumping on the left bank.
Repair Area 2: Boulder sill does not terminate into bank.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
REPAIR AREA 3:
Existing conditions
Repair Area 3 consists of outer bank erosion on the left bank at the end of log vane structure, approximately from
station 112+25 to 112+75. The bank erosion has exposed a footer log from the brush mattress structure, which is
protruding to the pool.
Proposed approach
KCI proposes that a live lift be installed along the entire outer bend of this reach. While the bank just past the log
vane appears to be stable for approximately 15 feet, the proposed lift will be extended into this section to allow for
continuity of the entire structure. The live lift will consist of heavy coir fiber matting and willow whips, along with a
stone base for added toe stability. In addition, a 5-foot wide bench will be installed to help minimize stresses during
bankfull events.
Repair Area 3: Outer bank erosion on the left bank.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Repair Area 3: Brush toe footer log protruding from under the left bank.
REPAIR AREA 4:
Existing conditions
Repair Area 4 consists of outer bank erosion on the right bank, approximately from station 113+15 to 113+65. The
cross-section has widened and exposed the footer logs from the brush toe structure that was installed originally.
Proposed approach
KCI proposes that a live lift be installed along the entire outer bend of this reach. The existing failed footer logs will
be removed and buried within the new live lift rock base. The live lift will consist of heavy coir fiber matting and
willow whips, along with a stone base for added toe stability. In addition, a 5-foot wide bench will be installed to help
minimize stresses during bankfull events.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Repair Area 4 : Outer bank erosion on the right bank.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
REPAIR AREA 5:
Existing conditions
Repair Area 5 consists of outer bank erosion on the left bank, approximately from station 118+10 to 118+40. There
is a failed brush toe structure that has caused most of the outer bank erosion. The high energy flows over this three -
log drop riffle structure also contribute to the erosion here. Additionally, there is little to no rock behind each of the
log sills, exposing the protective filter fabric. This could eventually lead to this structure piping in the future.
Proposed approach
KCI proposes that a live lift be installed along the left bank of this reach. The live lift will consist of heavy coir fiber
matting and willow whips, along with a stone base for added toe stability. In addition, a 5-foot wide bench will be
installed to help minimize stresses during bankfull events. The existing log drops will be enhanced with stone to
anchor the existing filter fabric and help stabilize the toe of the banks where the logs enter the banks.
Repair Area 5 : Outer bank erosion along the left bank of log drop structure.
REPAIR AREA 6:
Existing conditions
Repair Area 6 consists of outer bank erosion on the left bank, approximately from station 120+30 to 121+00. There
is a failed brush toe structure that has caused most of the outer bank erosion.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Proposed approach
KCI proposes that a live lift be installed along the entire outer bend of this reach. While the bank just past the log
vane appears to be stable for approximately 30 feet, the proposed lift will be extended into this section to allow for
continuity of the entire live lift structure. The live lift will consist of heavy coir fiber matting and willow whips, along
with a stone base for added toe stability. In addition, a 5-foot wide bench will be installed to help minimize stresses
during bankfull events. The new bench will tie into the existing lower benches just upstream and downstream of the
erosive area. Additionally, the inner bank will be graded to a lower slope to reduce the stress along the outer bank.
Repair Area 6 : Outer bank erosion on the left bank with an inner sad bar on the right bank.
REPAIR AREA 7:
Existing conditions
Repair Area 7 consists of a 4-log drop riffle with a boulder sill/log vane arm at the bottom, approximately from station
121+35 to 122+00. None of the log drops in the riffle structure have footer logs installed, with the first and third logs
showing signs of piping underneath. While the other two logs do not show signs of piping, the rock behind them has
begun to wash out exposing the underlying geotextile fabric. The riffle structure originally had brush toe installed
along both adjacent banks. The outer/left bank has active erosion along the entire length due to the brush toe failing
and washing away. A section on the right bank also has short stretch of erosion where the brush toe has washed out,
causing the bank to slump and erode.
Proposed approach
KCI proposes that a live lift be installed along the entire left/outer bend of this reach. The live lift will consist of heavy
coir fiber matting and willow whips, along with a stone base for added toe stability. In addition, a 5-foot wide bench
will be installed to help minimize stresses during bankfull events. The two piping logs will be re -installed with footer

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
logs or boulders backed with geotextile fabric and a stone mixture. Stone protection will be extended throughout the
entire riffle length to anchor any loose geotextile fabric and stabilize the log structures where they enter the banks
along both sides.
Repair Area 7 : Erosion along left bank of log drop riffle. Exposed geotextile fabric at log sills.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Repair Area 7 : Failed brush toe along left bank. Exposed brush toe footer log and filter fabric.
REPAIR AREA 8:
Existing conditions
Repair Area 8 consists a of 5-log drop riffle with brush toe banks along the entire riffle reach, approximately from
station 122+90 to 123+80. None of the log drops in the riffle structure have footer logs installed, with the second,
third and fourth logs showing signs of piping underneath. While the other two logs do not show signs of piping, the
rock behind them has begun to wash out exposing the underlying geotextile fabric. The outer/right bank has active
erosion from the second log to the third log, where the brush toe has washed away. A small section on the left bank
has collapsed into a hole where the underlying brush toe has settled.
There is a failing A -vane located at 124+15. Many of the footer boulders have been undercut and have fallen into the
middle of the pool.
Proposed approach
KCI proposes that a live lift be installed along the right/outer bend, from the second log to the fourth log of this reach.
The live lift will consist of heavy coir fiber matting and willow whips, along with a stone base for added toe stability.
In addition, a 5-foot wide bench will be installed to help minimize stresses during bankfull events. The three piping
logs will be re -installed with footer logs or boulders backed with geotextile fabric and a stone mixture. Stone
protection will be extended throughout the entire riffle length to anchor any loose geotextile fabric and protect the log
structures where they enter the banks along both sides. The small section on the left bank that has collapsed into a
hole will be filled with a suitable soil and stone mixture and stabilized with coir matting as needed.
The boulder vane structure will be rebuilt with two layers of footers (three total layers) to compensate for the deep
pool that has formed. A stone mixture will be added to the streambed just above the A -vane structure to help focus

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
the thalweg flow path back to the middle of the channel. The swinging gate at the bottom of the project will be rebuilt
with composite decking lumber.
Repair Area 8 : Right bank erosion, exposing brush toe logs. Piping dry fourth log.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
Repair Area 8 : Failing A -vane boulder structure.
Repair Area 8 : Failing swing gate at end of project.

Little Pine Creek112023 Repair (DAIN#856) Concept Plan
GENERAL NOTES:
Supplemental Planting
During the site assessment KCI noticed that bank vegetation is very low in many of the outer banks and riffle reaches
throughout the project limits. KCI recommends live stakes to be installed in all locations that lack woody vegetation
or are low density.
Low stem density areas within the conservation easement will receive a supplemental planting; species list will be
limited to the approved mitigation plan list unless otherwise pre -approved by the IRT.

Q o
� ti ti ti ti ti ti ti ti
mb
m
O
O
o
0 3 0 a
vl Zn a Zn N � O �+1 O a-
Y °' �+ v � v v
0 0 0 0 o Y o 0 0
3 v ., v m
0 w 0
o a a w w w w Y w m w m
a a v Y v 0 v v 0 v v v 0 0
o o O o o m vv N
m m"'i w v
m o o o
a 2 ' a a v v a
v a 9 m m
o O o u
fl- o
4 0 v o 0 0 0 'o a .
'o Q
0 o a o 0 o T o �
o _T Y �`o .Q Y o
v v v v v— v o v v w a
v Y Y 9 Y Y 9 O O
0 9 9 C 9 N O N Y
a a N n v 5i Y
O 'o 0 0 o O O Y O N ou
m
o
0
O
0
0
z�