20161200 Ver 1_Draft Mit Plan Comment Memo_20200327

Strickland, Bev
From:
Browning, Kimberly D CIV USARMY CESAW (USA)
<[e-mail]>
Sent:
Friday, March 27, 2020 3:38 PM
To:
Tugwell, Todd J CIV USARMY CESAW (US); Haupt, Mac; Davis, Erin B; Wilson, Travis W.;
Merritt, Katie; [e-mail]; Bowers, Todd; Gibby, Jean B CIV USARMY
CESAW (USA); Dailey, Samantha J CIV USARMY CESAW (USA); Crumbley, Tyler A CIV
USARMY CESAW (USA); McLendon, C S CIV USARMY CESAW (USA)
Cc:
Barbara A Doll; Allen, Melonie; Baumgartner, Tim
Subject:
[External] Notice of Intent to Approve/ NCDMS Millstone Creek Mitigation Site/
Randolph County/ SAW-2019-01363
Attachments:
Draft Mit Plan Comment Memo -Millstone Creek_2019-01363.pdf
Follow Up Flag: Follow up
Flag Status: Completed
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an attachment to [e-mail]<mailto:[e-mail]>
Good afternoon folks,
We have completed our review of the Draft Mitigation Plan for the NCDMS Millstone Creek Mitigation Site
(SAW-2019-01363). Please see the attached memo, which includes all NCIRT comments that were received
during the review process along with additional comments provided by Wilmington District staff following our
review.
We have evaluated the comments generated during the review period, and determined that the concerns
raised are generally minor, however we require a response to comments (via errata sheet) prior to issuing the
Approval Letter. The concerns can be addressed in the final mitigation plan. Accordingly, it is our intent to
approve this Draft Mitigation Plan (contingent upon the attached comments being addressed in the Final
Mitigation Plan) unless a member of the NCIRT initiates the Dispute Resolution Process, as described in the
Final Mitigation Rule (33 CFR Section 332.8(e)). Please note that initiation of this process requires that a
senior official of the agency objecting to the approval of the mitigation plan (instrument amendment) notify
the District Engineer by letter within 15 days of this email (by COB on April 11, 2020). Please notify me if you
intend to initiate the Dispute Resolution Process.
Provided that we do not receive any objections, we will provide an approval letter to NCDMS at the conclusion
of the 15-day Dispute Resolution window, and after we receive response to comments. This approval will also
transmit all comments generated during the review process to NCDMS, which must be addressed in the Final
Mitigation Plan to be submitted with the Preconstruction Notification Application for NWP 27. All NCIRT
members will receive a copy of the approval letter and all comments for your records.
Thank you for your participation. Please contact me if you have questions or wish to discuss.
Be well,
Kim

Kim Browning
Mitigation Project Manager, Regulatory Division I U.S. Army Corps of Engineers
3331 Heritage Trade Dr, Ste. 105 1 Wake Forest, NC 27587 1 919.554.4884 x60
BUILDING STRONG (r)
*NOTE: I am currently teleworking and away from my office. Please contact me via email or at 919.413.6392.
-Original Message -----
From: Browning, Kimberly D CIV USARMY CESAW (USA) <[e-mail]>
Sent: Thursday, February 06, 2020 4:07 PM
To: Tugwell, Todd J CIV USARMY CESAW (US) <[e-mail]>; Browning, Kimberly D CIV
USARMY CESAW (USA) <[e-mail]>; Haupt, Mac <[e-mail]>;
Davis, Erin B <[e-mail]>; [e-mail]; Merritt, Katie
<[e-mail]>; [e-mail]; [e-mail]; Williams, Andrew E CIV
USARMY CESAW (USA) <[e-mail]>; Gibby, Jean B CIV USARMY CESAW (USA)
<[e-mail]>; Crumbley, Tyler A CIV USARMY CESAW (USA)
<[e-mail]>; McLendon, C S CIV USARMY CESAW (USA)
<[e-mail]>
Cc: Barbara Doll <[e-mail]>; Allen, Melonie <[e-mail]>; Baumgartner, Tim
<[e-mail]>
Subject: Notice of NCDMS Draft Mitigation Plan Review/ Millstone Creek Mitigation Site/ Randolph County/
SAW-2019-01363
Good afternoon,
The below referenced Draft Mitigation Plan has been posted by NCDMS on the Draft Mitigation Plan Review
section of the DMS & IRT SharePoint Site. Per Section 332.8(g) of the 2008 Mitigation Rule, this review period
will remain open for 30 calendar days from this email notification. Please email comments to me by 5 PM on
the 30-day comment deadline shown below. When providing comments please indicate if your concerns are
great enough that you intend to initiate the Dispute Resolution Process described in Section 332.8(3) of the
Mitigation Rule. Comments provided after the 30-day comment deadline (shown below) may not be
considered. This comment period may be extended at the request of NCDMS if they determine that additional
time is necessary to make changes to the Draft Mitigation Plan. Please note that NCDMS may post responses
to the comments on the SharePoint site as well.
At the conclusion of this comment period, a copy of all comments will be provided to NCDMS and the NCIRT of
the District Engineer's intent to approve or disapprove this project. More information, including instructions to
access and use the SharePoint Site, and a flow chart detailing the process are included in the document
attached to this email notice.
The REVISED DRAFT Millstone Creek (Ken Cox) Mitigation Plan is ready for IRT review; the first draft review
comments and responses have been appended to the revised document posted.
Project information is as follows:
Millstone Creek (Ken Cox)
DMS Project # 204

Institution Date: 5/22/2006
Cape Fear River Basin
Cataloging Unit 030030003
Randolph, North Carolina
USACE Action ID #: 2019-01363
DWR#: 20161200
Proposed Mitigation Plan Assets: 3,245 SMUs, 0.686 WMUs
NCDEQ - DMS Project Manager: Melonie Allen, Allen, Melonie <[e-mail]>, [phone]
The full Mitigation Plan has been uploaded to the NCDEQ Share Point Mitigation Plan Review page and can be
accessed here:
https://urldefense.com/v3/_https://ncconnect.sharepoint.com/sites/deq_ext/dwm_irt/I RT*20Upload*20Do
currents*20Here/Forms/Allltems.aspx?id=*2Fsites*2Fdeq*5Fext*2Fdwm*5Firt*2F1 RT*20Upload*20Documen
is*20Here*2FMillstone*20Creek_;JSUIJSUIJSUIJSUIJSU!!HYmSToo!M_ZaHg56rPPgEFAGNucTlOIMCqK5O0zPx
-IUUW5ovnCg57_wHGMQmj6ginMucBk4UvA$
DMS/I RT Share Point:
https://urldefense.com/v3/_https://ncconnect.sharepoint.com/sites/deq_ext/dwm_irt/default.aspx_; ! ! HY
mSToo!M_ZaHg56rPPgEFAGNucT1O1MCqK5O0zPx-IUUW5ovnCg57_wHGMQmj6ginMuw8DQ5Hw$
30-Day Comment Start Date: February 6, 2020
30-Day Comment Deadline: March 7, 2020
60-Day Intent to Approve Deadline: April 6, 2020
Please contact the Wilmington District Mitigation Office if you have questions.
Thanks
Kim
Kim Browning
Mitigation Project Manager, Regulatory Division I U.S. Army Corps of Engineers
3331 Heritage Trade Dr, Ste. 105 1 Wake Forest, NC 27587 1 919.554.4884 x60
BUILDING STRONG (r)

DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS
69 DARLINGTON AVENUE
WILMINGTON, NORTH CAROLINA 28403-1343
REPLY TO
ATTENTION OF:
CESAW-RG/Browning
MEMORANDUM FOR RECORD
March 27, 2020
SUBJECT: Millstone Creek Mitigation Site - NCIRT Comments during 30-day Mitigation Plan Review
PURPOSE: The comments listed below were received during 30-day comment period in accordance
with Section 332.8(g) of the 2008 Mitigation Rule in response to the Notice of NCDMS Mitigation Plan
Review.
NCDMS Project Name: Millstone Creek Mitigation Site, Randolph County, NC
USACE AID#: SAW-2019-01363
NCDMS #: 204
30-Day Comment Deadline: March 7, 2020
DWR Comments, Mac Haupt & Erin Davis:
1. Page 7, Table 1.1 — The 1:1 ratio proposed for NT R2, UTA R2 and UTB do not appear
appropriate for the outlined E1 level approaches. However, DWR appreciates that proactive
enhancement activities, such as cattle exclusion, have been implemented and are contributing
to functional uplift. DWR would support a 1.5:1 ratio for the three proposed E1 / R equivalent
reaches.
2. Page 28, Section 5.1 — The USFWS website was consulted on August 27, 2007. Please revisit
this source to confirm that there have been no changes to listed species.
3. Page 35, Section 8.2 — Should Header be labeled as UTA R1 instead of UTA R2?
4. Page 36, Section 8.2.1 — DWR is concerned that by raising the channel bed by 5-6 feet at the
top of UTA R1 and NT R1 that flow may not be maintained, and jurisdictional stream status may
be lost. Flow documentation in the upper sections of these reaches will be critical.
5. Page 39, Section 8.2.4 — Please correct UTA R2 and UT R2 to UTA R1.
6. Page 48, Table 8.9 — Are live stakes included in the stem counts (e.g. silky dogwood)? If not,
please include live stake species and estimated quantities.
7. Page 52, Section 8.7 — Are sod mats still being proposed? They do not appear in the design
sheets. If proposed, please add a typical detail.
8. Page 53, Section 8.9 #3 — The proposed transition from perennial single thread channel to
wetland will be an area to monitor for signs of instability. Additionally, with the wetland ditch
plugged and the previously proposed log -step outfall not included in this design version,
monitoring any concentrated flow areas developing between the wetland and Mill Creek for
instability will also be important to address.
9. Page 56, Section 9.5 — The proposed wetland enhancement is based on hydrologic functional
uplift, as such DWR recommends the hydrologic performance criteria of a minimum 8 percent

hydroperiod. DWR also requests an additional wetland groundwater gauge, for a total of two
wetland monitoring gauges.
10. Page 56, Section 10 — Please confirm that the record drawings and baseline monitoring report
will be submitted after completion of Phase 2 construction. Phased monitoring periods are not
proposed, correct?
11. Design Sheets - Please include the following items:
a. Location of existing and proposed fencing;
b. Details: ford crossing, BMP wetland feature, ditch plug (specify minimum plug width),
ditch filling/partial filling (specify maximum depth from ground surface to be filled), live
stake installation, bare root and container planting
12. Figure 10.1
a. In order to monitor the minimum 30-day consecutive flow performance standard, please
add flow gauges to NT R1 and UTA R1, within the upper one-third of each reach.
b. DWR requests an additional cross section along the lower section of MC R1 and an
additional wetland groundwater gauge.
c. Please show the easement boundaries.
USACE Comments, Kim Browning:
1. When submitting the PCN, please include an estimate of the number of trees, or acres, to be
cleared for the NLEB 4(d) Rule.
2. Please QA/QC this document for grammar and typos.
3. There is conflicting information throughout the plan: Page 12 states that Millstone Creek is the
only perennial channel on site, while pages 22 and 39 indicate that all channels are perennial.
Page 31 states that tributaries have little to no flow. NCSAM forms indicate channels are
perennial. Please adjust the text for consistency.
4. Table 1.1:
a. The 2016 NCIRT Guidance specifies that additional credit of up to 2% may be generated
for each tributary to be monitored for water quality. At a minimum, water quality and
macroinvertebrate sampling must be conducted to receive the additional credit. Additional
credit is eligible on restored and enhanced reaches of stream channels with the intent of
linking stream mitigation and functional uplift. The IRT will authorize 4% additional credits
for streams only on this site.
b. Water Quality credits are not authorized for wetlands.
c. The 2% increase proposed for success on At -Risk Tribs is not authorized.
d. Please carry out stream credits to at least two decimal places, and avoid rounding.
e. Please show how the credits are being calculated by reach length, total credits, and 4%
increase per reach. For example, Reach NTR1 is proposed for 326 LF (existing 303 LF),
326 SMUs, and 13.04 additional credits at 4%. Please see example revision at the end
of this document.
5. Reaches proposed for El with a R Equivalent should be credited at 1.5:1, not 1:1 as proposed.
The proposed work appears to be standard Enhancement I, defined as any stream mitigation
activity that does not involve restoration of the entire stream channel. The only section that
appears to meet restoration activities is on UTB near the bend at station 16+00. Additional credit
for WQ monitoring is already being awarded on these reaches, and therefore is not justification
for a 1:1 ratio. Bank grading, in -stream structures, and buffer planting meets the criteria for El at
1.5:1. Additionally, NTR1 is already receiving a 1:1 ratio, and the WQ treatment on that reach is
not justification to increase the ratio on other reaches. Since cattle are currently excluded from
project reaches, that is not justification for an increased ratio.
6. Categorical Exclusion Documents should be updated. The response letter from SHPO dated
December 12, 2003 is sufficient. However, please update the NCWRC and USFWS documents

with current T&E species. I did receive an email response to the Public Notice from FWS on
Aug. 13, 2019 stating that they have no significant concerns with this project.
7. Page 32: Is there a WQ monitoring station downstream of the ford crossing?
8. Table 7.1 indicates that livestock exclusion fencing will be installed. It is unclear where fencing
currently exists. Please indicate on a map or in the plan sheets.
9. Please include the water quality monitoring locations on the Monitoring Map.
10. Wetland enhancement area should demonstrate functional uplift. The performance standard for
the wetland should be a minimum of an 8% hydroperiod, and pre -well data should be provided
in order to show uplift. Additionally, a discussion of the NCSAM functional assessment rating as
LOW for habitat might be helpful.
a. Please add a vegetation monitoring plot to the wetland area to ensure that with increased
hydrology the vegetation is not negatively impacted.
11. Please address how fescue will be treated/removed.
12. It appears that the majority of the site has buffer widths that exceed the minimum 50 feet. Since
there is only one crossing on the site and you are capturing the terminal ends of the tributaries,
you may want to consider running the Buffer Tool on the project to see if you can get the
additional 2% buffer credit. The crossing and the wetland area will need to be clipped from the
buffered area for credit. If it turns out to be beneficial, please include the GIS map and
corresponding table.
13. Design sheets: Several sheets are upside down and out of order, and there are three sheets
labeled page 4.5. Please correct.
a. Please include a ditch plug detail.
14. There is concern for hydrologic trespass to occur since the ditch entering the wetland will be
plugged and there is no planned outlet for the wetland.
15. Page 39, Section 8.2.4: Please QA/QC this paragraph for stream labeling. Also, to be clear about
phased construction over a two-year period, the initial credit release will not occur until the
Record Drawing/As-Built is received and approved.
16. Ford Crossing: There is some concern with the amount of sediment coming into the system.
Without seeing the design detail it's difficult to discern whether the structure will have an
upstream and downstream sill to hold elevation and retain substrate in place. Will it be designed
to incorporate reinforcing underlying material?
17. Page 53, #1: with the amount of sediment coming into the system, is there a concern that the
pools will fill in over time, decreasing bedform diversity?
18. Beaver were mentioned in the document, please add this t the Risks/Uncertainties section. At
the end of this memo there are some EXAMPLE risks to consider.
19. Page 54, Section 9: Please remove the statement "If all performance standards have been
successfully met, NCDMS may propose to terminate stream, wetland and/or veg monitoring after
MY5." 7 years of monitoring is required.
20. Section 9.4: There will be no loss of credits if this performance standard is not met; however, the
additional 2% for NTR1, NTR2, UTAR1 and UTB are not approved.
21. Table 10.1: The section that discusses exclusion of livestock from channels is unclear whether
fencing is existing or planned. The treatment for this section should be to install or maintain
livestock exclusionary fencing. The discussion of the conservation easement establishment
should be under site protection.
22. Section 10.4: Please see the end of the document for example phrasing for the Adaptive
Management section.
23. Section 11: Please revise based on correct ratios.
24. General note: It's helpful when all maps and figures are located in one section of the plan.
BROWNING.KIM Digitally signed by
BROWN ING.KIMBERLY.DANI Kim Browning
BERLY.DANIELLE ELLE.1527683510 Mitigation Project Manager
Date: 2020.03.27 15:26:33
.1527683510-04'00' Regulatory Division

Example of how to revise Table 1.1:
Reach
Existing
Length
Approach
Proposed
Len th
Mitigation
Ratio
Proposed
Credit
4% WQ
Monitoring
NTR1
303
R
326
1:1
326.00
13.04
NTR2
103
El
103
1.51
68.67
2.75
UTAR1
505
R
523
1:1
523.00
20.92
UTAR2
100
El
100
1.5:1
66.67
2.67
UTB
529
El
529
1.51
352.67
14.11
MCR1
1462
El
1462
1.5:1
974.67
38.99
MCR2
553
R
533
1:1
533.00
21.32
TOTAL
3555
3576
2844.68
113.80
W-1
1.323
E
1.320
2:1
0.660
0
EXAMPLE Project Risks and Uncertainties
Listed below are identified project risks and uncertainties that have been evaluated in the
development of design plans for the site, along with methods that have been/will be used to address
these concerns. Methods to address may be presented as adaptive management.
1. Land use development: There is potential for increased land development around the site in
the future that could lead to additional runoff and changes to watershed hydrology.
Methods to Address: The project area has seen little development in recent years and it is
unlikely that development will threaten the site in the foreseeable future. Restoration of the
site to reconnect streams to their floodplains will reduce the likelihood of future degradation
from watershed changes, as increased flows will spread over a wider floodplain. Grade
control (in the form of constructed in -stream structures and natural bedrock outcrops) will
decrease the chances of future channel incision.
2. Easement Encroachment: Any encroachment to the conservation easement. (Including road
widening, culvert maintenance, utility easements, etc.)
Methods to Address: The sponsor has had considerable discussions with the landowner
regarding the project requirements and limitations of easement access and is confident that
the landowner fully understands and will maintain the easement protections. The easement
boundaries will be fenced with barbed wire fencing and clearly marked per NRCS
standards. Any encroachments that do occur will be remedied by the sponsor to address
any damage and provide any other corrections required by the IRT.
3. Drought and Floods: There is potential for extreme climatic conditions during the monitoring
period of the project.
• Methods to Address: The sponsor will apply adaptive management techniques as
necessary to meet the site performance criteria. Such adaptive management may include

replanting, channel damage repair, irrigation, or other methods. If adaptive management
activities are significant, additional monitoring may be required by the IRT.
4. Beavers: While there was no evidence of recent beaver activity during recent assessments,
there is potential for beavers to colonize the site during the monitoring period of the project.
• Methods to Address: Due to the watershed size, beaver colonization is unlikely. However,
the sponsor will take steps to trap and remove beaver if they colonize the Site during the
monitoring period.
5. Hydrologic Trespass: There is potential for the stream restoration to create conditions under
which hydrologic trespass on adjoining landowners is more likely.
• Methods to Address: The majority of the project has been designed and will be
constructed utilizing a priority 2 restoration approach, which will greatly reduce the potential
of hydrologic trespass outside of the conservation easement boundary. Along UT1 Reach
3 where the stream transitions to a priority 1 restoration approach, the conservation
easement boundary is located up the adjacent hill slopes. The ground elevations along the
conservation easement boundary in this area are approximately 2 to 3 feet above the
bankfull elevation. Based on Manning's equation, the cross section from easement
boundary to easement boundary along UT1 Reach 3 will convey approximately 689 cubic
feet per second (cfs). Using USGS regression equations, which utilize drainage areas and
impervious surface, the estimated discharge from the 500-year recurrence interval is 185
cfs. Based off this information, the possibility of hydrologic trespass is extremely unlikely
and is not expected to be an issue.
6. Invasive/Nuisance Species: Numerous invasives, such as kudzu and Chinese privet
currently exist in the easement area. There is potential for these species to jeopardize buffer
vegetation establishment.
• Methods to Address: The sponsor will locate invasive vegetation. It will be visually
assessed, photographed, and mapped. These areas will be treated by mechanical or
chemical methods, so that invasive species are no more than 5% of the easement acreage,
and zero tolerance for kudzu. Any vegetation requiring herbicide application will be
performed in accordance with NC Department of Agriculture rules and regulations.
EXAMPLE Adaptive Management
An integral part of a successful compensatory mitigation project is early detection of problems during
implementation, determining the cause(s) of those problems, and attempting to correct those
problems so that the compensatory mitigation project achieves its objectives and ecological
performance standards. Interim performance standards are crucial to ensuring compensatory
mitigation performance follows a trajectory to attain final compensatory mitigation success.
In the event the mitigation site or a specific component of the mitigation site fails to achieve the
necessary performance standards as specified in the mitigation plan, the sponsor shall notify the
members of the IRT and work with the IRT to develop contingency plans and remedial actions. Large
scale corrective measures may require an Adaptive Management Plan. Large scale corrective
measures may include, but are not limited to, re -grading part of the mitigation site, replanting more
than 20% of the site to improve composition or species diversity, or the addition of stabilization
structures. The Adaptive Management Plan review will follow Section 332.8(o)(9) of the 2008

Mitigation Rule, part of the streamlined review process, which requires an IRT review period of 15
calendar days.
Once the Adaptive Management plan is prepared, the sponsor will:
1. Notify the USACE as required by the Nationwide Permit 27 general conditions.
2. Notify NCDWR if necessary for 401 conditions.
3. Revise performance standards, maintenance requirements, and monitoring requirements as
necessary.
4. Obtain other permits as necessary.
5. Submit the Adaptive Management Plan for IRT review and approval.
6. Implement the Adaptive Management Plan.
7. Provide the IRT a Record Drawing/As-Built of corrective actions.
The Final Mitigation Plan should include:
1. Identify responsible parties who will identify problems.
2. Potential problems that may arise during the monitoring period, particularly if performance
standards are not met.
3. Potential causes of those problems.
4. Identify a process for determining measures to correct deficiencies in compensatory mitigation
projects, such as site modifications, design changes, revisions to maintenance requirements,
and revisions to monitoring requirements (see 33 CFR § 332.7(c)(3))