20150414 Ver 1_Sandy Bridge Grading Work Memo

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Hi Adam,

Thanks for sending the information on Sandy Bridge. This site is a good example of how existing beaver in a watershed can be a challenge for mitigation sites. At this point, the IRT
would suggest implementing a staged Adaptive Management Plan. We would offer the following comments:

1. Would it be possible to expand the project to encompass the flooded area in a conservation easement? This would be similar to other DMS projects where we’ve captured additional wetlands
and created a Phase II of the project. This would be our preference. Is there a need for additional wetland credit in that area?
2. Since beaver appear to be the underlying cause of the flooding, and not the project design, beaver management seems like a better long-term solution.
3. Our concern with the proposed berm/swale is two-fold:

a. The berm may increase site hydrology to the level that vegetation survival is affected, and may also create a beaver pond. Additionally, the berm may pond additional water on the
farm.
b. Creating a berm on one side of the site prevents upslope water from draining through the site and redirects agricultural flow around the buffer, reducing the water quality benefits
on half of the site.

4. Since the proposed work is located outside the conservation easement, Stewardship will have no control over the maintained height of the berm or depth of the swales, or their influence
on the site. What would be the lateral drainage effect of the swales on the mitigation site? If the hydrology is negatively impacted, that could lead to success criteria not being
met, and transversely, if the site becomes too inundated, vegetation may be affected, both of which could lead to reduced credit.

We appreciate you being proactive and discussing options to minimize the effects of the beaver. This is a good example of how expanded buffers on wetlands may have been beneficial.
Once you’ve had a chance to discuss this with DMS, please let us know your path forward.

Please reach out if you’d like to set up a call with the IRT to discuss.

Thanks,

Kim

Kim Isenhour

Mitigation Project Manager

US Army Corps of Engineers I Wilmington District I Regulatory Division

3331 Heritage Trade Dr., Suite 105 I Wake Forest, NC 27587 I 919.946.5107

From: Adam Spiller <[e-mail]>
Sent: Tuesday, May 30, 2023 3:14 PM
To: Tugwell, Todd J CIV USARMY CESAW (USA) <[e-mail]>; Isenhour, Kimberly T CIV USARMY CESAW (USA) <[e-mail]>; Haywood, Casey M CIV USARMY
CESAW (USA) <[e-mail]>; Kichefski, Steven L CIV USARMY CESAW (USA) <[e-mail]>; [e-mail]
Cc: Kirsten Ullman <[e-mail]>; Kevin O'Briant <[e-mail]>; [e-mail]; Wiesner, Paul <[e-mail]>
Subject: [URL Verdict: Neutral][Non-DoD Source] Sandy Bridge Grading Work Memo

Good afternoon,

For those of you familiar with the Sandy Bridge FDP project, you’re likely familiar with the beaver colonization/control issues we’ve had ongoing throughout the project’s lifespan. We’re
trying to work with the landowner to create a plan that will minimize the effects of the beavers backing up water into his fields adjacent to the project. We have put together the attached
memo that outlines that plan. From our observations over the course of monitoring, this plan shouldn’t affect the hydrology within the site and offers the best chance at mitigating
the beaver effects after the project closes out.

Please review and provide any feedback or questions you may have.

Thanks,

adam

Adam Spiller

Regional Practice Leader – Natural Resources

Vice President

KCI ASSOCIATES OF NORTH CAROLINA

4505 Falls of Neuse Road, Suite 400, Raleigh, NC 27609

[e-mail] <mailto:[e-mail]>

o: 919.278.2514 | m: 919.475.3696

www.kci.com <Blockedhttp://www.kci.com/>

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