20190866 Ver 1_Notice of Initial Credit Release_20220914

Hamilton, Ryan
From:Davis, Erin B
Sent:Friday, September 16, 2022 11:46 AM
To:Hamilton, Ryan
Subject:FW: \[External\] Notice of Initial Credit Release/ NCDMS Huntsman Mitigation Site/
SAW-2019-00836/ Wilkes County
Attachments:Huntsman_100123_YD 102_STR_Initial Release KI.pdf
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DWR#: 20190866 v.1
Doc Date: 9/14/22
Doc Type: Mitigation Evaluation
Doc Name: General topic of email title

From: Browning, Kimberly D CIV USARMY CESAW (USA) <[e-mail]>
Sent: Wednesday, September 14, 2022 2:10 PM
To: Wiesner, Paul <[e-mail]>
Cc: Tugwell, Todd J CIV USARMY CESAW (US) <[e-mail]>; Davis, Erin B <[e-mail]>;
Wilson, Travis W. <[e-mail]>; Bowers, Todd <[e-mail]>; Haywood, Casey M CIV
USARMY CESAW (USA) <[e-mail]>; Leslie, Andrea J <[e-mail]>;
McHenry, David G <[e-mail]>; Reid, Matthew <[e-mail]>; Harmon, Beth
<[e-mail]>; Stanfill, Jim <[e-mail]>; Allen, Melonie <[e-mail]>;
Shawn Wilkerson <[e-mail]>; Aaron Earley <[e-mail]>; Crumbley, Tyler A CIV
USARMY CESAW (USA) <[e-mail]>
Subject: \[External\] Notice of Initial Credit Release/ NCDMS Huntsman Mitigation Site/ SAW-2019-00836/ Wilkes County

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Good afternoon,

The 15-Day As-Built/MY0 review for the Huntsman Mitigation Site (SAW-2019-00836) ended September 9, 2022. Per
Section 332.8(o)(9) of the 2008 Mitigation Rule, this review followed the streamlined review process. All comments
received from the NCIRT are incorporated in the email below. There were no objections to issuing the initial 30% credit
release of 1,745.082 warm stream mitigation units; however, we are requesting a written response to IRT comments
prior to the site visit scheduled for October 13, 2022. Please send a georeferenced CCPV map along with your
responses. Please find attached the current signed ledger.

The site visit will be held October 13, 2022, 10:30 am, Wilkes County (36.140626, -80.932103)

Kim Isenhour, USACE:

1. In addition to DWR’s concerns, please confirm what size rock was used in the constructed riffles on UT1. As I
recall, there was degradation on a steep section near STA 210+50 (?). DWR expressed concerns about the size of
the material used; and questioned whether using larger rock in these riffles and embedding some Class I and
1

only top dressing with any remaining on-site smaller material may have been more appropriate. Please provide
more detail on this repair.

Erin Davis, NCDWR:
1. The PP14 photo shows the Ingle Hollow Road culvert. In response to WRC’s draft mit plan review comment
regarding the perched culvert being an aquatic passage barrier, a sill was to be added downstream setting the elevation
to submerge the pipe outlet six inches. Based on the photo it’s difficult to see if water is being backed up into the
culvert. Please confirm that the structure was installed as noted and the barrier has been abated.
2. The photo of veg plot 2 appears to show exposed soil with no signs of germination or straw cover, unlike the
other veg plot photos. Has cover/stabilization of this area been addressed? Additionally, please watch for rill formation
and sediment migration along graded slopes that were not matted (e.g., PP8 and PP9). Between working with pond
bottom sediments, areas of priority 2 and very steep side slopes, DWR is concerned about sediment movement within
and adjacent to the site becoming a stream pollutant risk beyond initial construction.
3. The step pool conveyance BMP photos for Old Bus Branch (PP27) and Rifle Trib. (PP23) appear very different,
with Rifle Trib. having significantly more riprap. What facilitated the Rifle Trib. BMP design change from a vegetated
BMP to a riprap step pool conveyance channel? It seems the vegetated BMP would offer more water quality benefits.
4. Since a permanent veg plot was shown in the UT1 lower pond bottom in both draft and final mitigation plan
monitoring figures, DWR did not require one in our review comments. However, since that veg plot has been changed to
a mobile plot, DWR is now requiring a permanent veg plot within the UT 1 lower pond bottom.
5. IRT members expressed concerns about the proposed buffer widths during the mitigation plan review. One
reason DWR was concerned about narrower buffers along UT1 was that it meant steeper side slopes, which as the
redline shows resulted in multiple riprap lined ditches not planned for in the initial design. Of particular concern is that
four of the riprap ditches are in the vicinity of existing chicken houses. Please provide more information on the necessity
of adding the riprap ditches. How does this affect the mitigation plan Section 3.4 functional uplift to “diffuse overland
non-point source pollutants from adjacent land use”? Additionally, Sheet 1.1.5 shows added riprap covering an existing
wetland area. If this was/is a jurisdictional feature, why wasn’t a non-hardened stabilization option applied?
6. Section 3.3 noted a couple riffle cross sections were larger than designed. Are these areas shown on the redline
drawings? If not, can you please identify the locations.
7. Please add stream and reach labels to the CCPV Figures 3.1 and 3.2.

Please reach out with any questions.
Thanks,
Kim

Kim Isenhour
Mitigation Project Manager, Regulatory Division I U.S. Army Corps of Engineers l 919.946.5107

2

River Basin Date Project Instituted
Cataloging Unit Date Prepared03040102
Yadkin
8/17/2022
5/21/2019
Mitigation Project Name USACE Action ID
DMS ID DWR Permit100123
Huntsman Site
2019-0866
2019-00836
1 - For NCDMS, no credits are released during the first milestone (Site Establishment).
2 - For NCDMS projects, the initial credit release milestone occurs when the as-built report (baseline monitoring report) has been approved by the
NCIRT and posted to the NCDMS Portal, provided the following criteria are met:
1) Approval of Final Mitigation Plan;
2) Recordation of the preservation mechanism, as well as a title opinion acceptable to the USACE covering the property;
3) Completion of all physical and biological improvements to the mitigation site pursuant to the mitigation plan;
4) Receipt of necessary DA permit authorization or written DA approval for projects where DA permit issuance is not required.
3 - A 10% reserve of credits is to be held back until the bankful event performance standard has been met.
Signature of Official Approving Credit Release
County Stream/Wet. Service AreaWilkes Yadkin 03040102
Credit Release Milestone Warm Stream Credits
Project Credits Scheduled
Releases %
Estimated
Scheduled
Release #
Proposed
Released #
Not
Approved
# Releases
Approved
Credits
Anticipated
Release
Year
Approved
Release
Date
N/A N/A N/A
2 - Year 0 / As-Built 30.00%1,745.082 1,745.082 0.000 1,745.082 2022 8/17/2022
1 - Site Establishment N/A N/A N/A N/A
2023
4 - Year 2 Monitoring 10.00%581.696 2024
3 - Year 1 Monitoring 10.00%581.696
2025
6 - Year 4 Monitoring 5.00%290.847 2026
5 - Year 3 Monitoring 10.00%581.696
2027
8 - Year 6 Monitoring 5.00%290.847 2028
7 - Year 5 Monitoring 10.00%581.696
2029
Stream Bankfull Standard 10.00%581.696 2026
9 - Year 7 Monitoring 10.00%581.696
Totals 1,745.082
Total Unrealized Credits to Date 0.000
Total Gross Credits 5,816.952
Total Percentage Released 30.00%
Total Released Credits to Date 1,745.082
Notes
Remaining Unreleased Credits 4,071.870
Warm Stream Restoration 5,397.862
Warm Stream Enhancement II 593.426
Contingencies (if any)
Project Quantities
Mitigation Type Restoration Type Physical Quantity
Huntsman Site
Yadkin 03040102
River Basin Date Project Instituted
Cataloging Unit Date Prepared03040102
Yadkin
8/17/2022
5/21/2019
Mitigation Project Name USACE Action ID
DMS ID DWR Permit100123
Huntsman Site
2019-0866
2019-00836
County Stream/Wet. Service AreaWilkes Yadkin 03040102
Owning Program
Beginning Balance (mitigation credits)5,816.952
Released Credits 1,745.082
Unrealized Credits 0.000
Debits
Warm Stream
Restoration
Credits
Remaining Balance (Released credits)1,745.082
Remaining Balance (Unreleased credits)4,071.870
Total Remaining Balance (Released and Unreleased credits)5,816.952
Converted Credits 0.000
Req. Id TIP #Project Name USACE
Permit #
DWR
Permit #
DCM
Permit #
Huntsman Site
Yadkin 03040102