20171041 Ver 1_Mitigation Information_20211005

fires
October 5, 2021
Paul Wiesner
NC DEQ Division of Mitigation Services
5 Ravenscroft Drive, Suite 102
Asheville, NC 28801
360o Glenwood Avenue, Suite ioo
Raleigh, NC 27612
Corporate Headquarters
6575 W Loop S #300
Bellaire, TX 77401
Main: 713.520.5400
RE: Little Sebastian Mitigation Site: Mitigation Plan Addendum and Baseline Report and As -Built
Drawings (NCDMS Project ID #100027)
Listed below are comments provided by IRT on October 4, 2021 regarding the Little Sebastian Mitigation
Site: Mitigation Plan Addendum and Baseline Report and As -Built Drawings and RES' responses.
USACE Addendum Comments, Kim Browning:
1. Were stream and wetland impacts evaluated with the addition of reach JN-7, and were they
accounted for in the 404/401 permit?
This reach was not included in the PCN or 404/401 permit.
2. Is JN-7 perennial or intermittent? If flow is a concern, the IRT may request a flow gauge be
installed.
Based on drainage area (30 acres), RES believes this reach is intermittent. However, it was not
included in the JD. RES will install a flow gauge on it.
3. What was the condition of JN-7 prior to construction, and was the design incorporated into the
final design? Were there stability issues with the channel?
The condition of JN-7 prior to construction was a ditch -like channel connecting the pond outlet to
JN-3. This channel was about 75-feet long, incised, and a straight line from the pond outlet to
JN-3. A design was incorporated into the final design, after Final Mitigation Plan submittal, to
create a 150-foot stable channel from the pond outlet to the newly constructed JN3-B.
4. If JN-7 serves as an outlet for the adjacent pond, are there any concerns with stability or sediment
loads if the spillway fails or the dam breaches?
RES does not anticipate a dam failure considering the small drainage acre of the pond. However, if
it were to fail, there would likely be minor impacts, but the system should be able to handle the
relatively minor influx of sediment.
res.us

DWR MY-0 Comments, Erin Davis:
1. DWR appreciate DMS' request for crossing photos in future reports. Those photos would've been
helpful for this review.
Crossing photos will be included in future reports.
2. DWR is ok with the plant species substitutes. We were glad to see the reduction in percent green
ash planted.
3. Please confirm that all areas were planted, including any supplemental/understory planting, as
proposed in the approved mitigation plan.
Confirmed.
4. DWR is ok with the extra stage recorder not being installed on BS1-C. However, when we recently
visited the downstream Gideon Site we observed the presence of drift lines mid -slope up the
bank but not on the floodplain. Therefore, in lieu of the stage recorder being installed along
MC1-C as specified in the approved mitigation plan, DWR requests photo documentation of
evidence of overbank events be provided for this reach.
RES will provide photo documentation of overbank events on MC1-C.
USACE MY-0 Comments, Casey Haywood:
1. Concur with DWR's comments.
It was noted that two veg plots were moved (both on JN2); however, a random plot was also
added.

From: Davis, Erin B
To: Baker, Caroline D
Subject: FW: [External] Additional Information Request for Mitigation Plan Addendum/ NCDMS Little Sebastian Mitigation
Site/ SAW-2017-01507/ Surry County
Date: Wednesday, November 3, 2021 8:49:56 AM
Attachments: Little Sebastian 100027 Response To IRT Comments 10-5-2021.pdf
Laserfiche Upload: Email & Attachment
DWR#: 20171041 v.1
Doc Type: Mitigation Information
From: Wiesner, Paul
Sent: Tuesday, October 5, 2021 1:38 PM
To: Kim Browning <[e-mail]>
Cc: Tugwell, Todd J CIV USARMY CESAW (US)<[e-mail]>; Haywood, Casey M
CIV (USA) <[e-mail]>; Davis, Erin B <[e-mail]>; Wilson,
Travis W. <[e-mail]>; Leslie, Andrea J <[e-mail]>; Bowers,
Todd <[e-mail]>; Ryan Medric <[e-mail]>; Bradley Breslow
<[e-mail]>; Daniel Ramsay <[e-mail]>
Subject: RE: [External] Additional Information Request for Mitigation Plan Addendum/ NCDMS Little
Sebastian Mitigation Site/ SAW-2017-01507/ Surry County
Good afternoon Kim,
RES's responses to the IRT questions and comments from yesterday (10-4-2021) are attached for
your review.
Please let us know if you have any additional questions, comments or concerns.
Thanks
Paul Wiesner
Western Regional Supervisor
North Carolina Department of Environmental Quality
Division of Mitigation Services
828-273-1673 Mobile
paul.wiesner(2ncdenr.gov
Western DMS Field Office
5 Ravenscroft Drive
Suite 102
Asheville, N.C. 28801
D- E Q
.%111.�
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

From: Browning, Kimberly D CIV USARMY CESAW (USA) <Kimberly.D.Browning(@usace.arm)l.mil>
Sent: Monday, October 4, 2021 3:59 PM
To: Wiesner, Paul <paul.wiesner(@ncdenr.gov>
Cc: Tugwell, Todd J CIV USARMY CESAW (US) <Todd.J.Tugwell(@usace.arm)l.mil>; Haywood, Casey M
CIV (USA) <Casey.M.Haywood(@usace.army.mil>; Davis, Erin B <erin.davis(@ncdenr.gov>; Wilson,
Travis W.<travis.wilson(@ncwildlife.org>; Leslie, Andrea J<andrea.leslie(@ncwildlife.org>; Bowers,
Todd <bowers.todd(@epa.gov>; Ryan Medric <rmedric(@res.us>; Bradley Breslow
<bbreslow(@res.us>; Daniel Ramsay <dramsa)z(@res.us>
Subject: [External] Additional Information Request for Mitigation Plan Addendum/ NCDMS Little
Sebastian Mitigation Site/ SAW-2017-01507/ Surry County
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an
attachment to Report Spam.
Hi Paul,
The review period for the NCDMS Little Sebastian Mitigation Site Addendum and As -Built ended
September 25, 2021. The addendum requested an upward adjustment of the project's stream assets
(+19.660 Cool SMUs) for 37 linear feet of restoration on JN-7. I would like to request additional
information prior to approving the addendum. The IRT has concerns regarding the addition of reach
JN-7 since it was not discussed or evaluated during the August 2017 IRT site visit, and a modification
request was not submitted prior to construction. The PJD completed by William Elliot on May 22,
2018 does identify reach JN-7; however, this reach is listed on the Gideon Mitigation Bank Site on
the last page of the PJD (attached). Additionally, the PJD does not specify whether this reach is
perennial or intermittent. The DWQ Stream Identification Forms do not contain any information on
this reach either. It's difficult to assess functional uplift, and whether restoration was appropriate,
without baseline information.
USACE Addendum Comments, Kim Browning:
1. Were stream and wetland impacts evaluated with the addition of reach JN-7, and were they
accounted for in the 404/401 permit?
2. Is JN-7 perennial or intermittent? If flow is a concern, the IRT may request a flow gauge be
installed.
3. What was the condition of JN-7 prior to construction, and was the design incorporated into
the final design? Were there stability issues with the channel?
4. If JN-7 serves as an outlet for the adjacent pond, are there any concerns with stability or
sediment loads if the spillway fails or the dam breaches?
Please provide any additional information that may be helpful for this review. Moving forward,
please notify the IRT if reaches that have not been evaluated are proposed to be added.
DWR MY-0 Comments, Erin Davis:
1. DWR appreciate DMS' request for crossing photos in future reports. Those photos would've
been helpful for this review.
2. DWR is ok with the plant species substitutes. We were glad to see the reduction in percent
green ash planted.

3. Please confirm that all areas were planted, including any supplemental/understory planting,
as proposed in the approved mitigation plan.
4. DWR is ok with the extra stage recorder not being installed on BS1-C. However, when we
recently visited the downstream Gideon Site we observed the presence of drift lines mid -
slope up the bank but not on the floodplain. Therefore, in lieu of the stage recorder being
installed along MC1-C as specified in the approved mitigation plan, DWR requests photo
documentation of evidence of overbank events be provided for this reach.
USACE MY-0 Comments, Casey Haywood:
1. Concur with DWR's comments.
2. It was noted that two veg plots were moved (both on JN2); however, a random plot was also
added.
Please reach out with any questions.
Regards,
Kim
Kim Browning
Mitigation Project Manager, Regulatory Division I U.S. Army Corps of Engineers