20120773 Ver 1_Landing - Credit Request_20160530

KCI
ASSOCIATES O
NORTH CAROLINA, PA
May 22, 2014
ENGINEERS SCIENTISTS SURVEYORS CONSTRUCTION MANAGERS
Landmark Center II, Suite 220 4601 Six Forks Road Raleigh, NC 27609 [phone] [phone] Fax
Mr. Todd Tugwell
Regulatory Division
Wilmington District
U.S. Army Corps of Engineers
11405 Falls of Neuse Road
Wake Forest, NC 27587
And:
Mr. Tim Baumgartner
Deputy Director
NC DENR
Ecosystem Enhancement Program
1652 Mail Service Center
Raleigh, NC 27699
Subject: Jacob's Landing (95024) Stream Restoration Project
Request for Mitigation Plan Amendment
Dear Mr. Tugwell and Mr. McDonald,
This letter is in response to the discussions at an Interagency Review Team (IRT) meeting attended by
KCI on May 13, 2014. During this meeting KCI presented a request to modify the allocation of stream
mitigation credits on the Jacob's Landing stream restoration project. Citing procedural reasons, the IRT
requested that KCI submit a formal request to reallocate credits. This letter will serve as that request.
Request
KCI requests the following changes to the credit table provided in the Jacob's Landing Stream
Restoration Site - Final Mitigation Plan dated September 2012 (requested changes shown in red).
KC1 ASSOCIATES OF NORTH CAROLINA, P.A. www.kci.com
Employee -Owned Since 1988

Reach
Mitigation Type
Priority
Approach
Existing Linear
Footage
DesignedMitigation
Linear
Footage
Units
T1-1
Restoration
P2
326
303
303
T1-2
Enhancement II
158
109*
44
TI -3
Restoration
P2
846
893
893
T1A
Restoration
P2
294
178
178
T2-1
Restoration
P2
1,800
1,581*
1,581
T2-2
Restoration
P2
1,135
1,060*
1,060
T2A
Restoration
P2
465
465
465
Total Stream Enhancement 1
0
0
0
Total Stream Enhancement I1
158
109
44
Total Stream Restoration
4,866
4,015
4,480
Total Mitigation Units
4,524
Justification
The 465 linear feet of stream channel associated with reach T2 -A was identified during the Proposal
Stage (including an IRT site walk) as Enhancement Level 1 at a 1.5:1 ratio. As a matter of practice, KCI
attempts to be consistent with the credit -types requested in the Proposal during the assessment and the
design stages of the project. During the assessment and design stage for Reach T2 -A, a more aggressive
restoration approach was determined to be needed. This was primary due to the confinement of the
valley, the difficulty of access, the absence of a functional floodplain and the poor condition of the valley
walls leading down to the stream. These reasons and others resulted in ultimate decision to completely
change the stream type from a G -type channel to a CB -type channel. This approach was in fact a
restoration approach, although it never was properly identified as such in the Mitigation Plan. The
approach included the following restoration initiatives:
1. Channel type changed from a G4 channel to a C4/B4 channel by installing a typical riffle cross
section with a 3.6' bankfull bench and a 0.9' bank height.
2. Adjusted thalweg and centerline (planform) slightly throughout the reach to allow for the
incorporation of the bankfull bench. Bench location and width varied from cross section
depending on condition of valley and the ability to accommodate the full bankfull width given the
valley condition.
3. Installed significant number of structures (5 step pools, 8 riffle grade controls, 8 riffle
enhancements) to stabilize the profile and create in -stream habitat.
4. Added bedform diversity and stabilized the planform.
5. Stabilized the valley walls and contributing drainage features.
All of the items mentioned above support the reallocation of credit type to restoration (or enhancement at
a higher ratio). KCI requests that the IRT support the correction of the 1.5:1 Enhancement I ratio
KCI ASSOCIATES OF NORTH CAROLINA, P.A. www.kci.com
Employee -Owned Since 1988

proposed for Reach 2A in the Final Mitigation Plan to 1:1 ratio. KCI can provide amended copies of the
Mitigation Plan, if desired.
We hope you find this information appropriate in order to move forward with your decision. If you have
further questions or comments, feel free to contact me at 919-278-2511 or tim.morrisgkci.com .
Sincerely,
Timothy J. Morris
Senior Environmental Scientist
cc: Joe Pfeiffer, KCI (email)
Adam Spiller (email)
Tim Baumgartner, EEP (email)
KCI ASSOCIATES OF NORTH CAROLINA, P.A. www.kci.com
Employee -Owned Since 1988