20020820 Ver 1_Restoration Plan_20080813

A O?Z_d'
Environmental Consultants, PA
Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
August 13, 2008
S&EC Project No. 6798.D10
Mr. Jamie Shern Mr. Eric Kulz
U.S. Army Corps of Engineers NCDENR - Division of Water Quality
Raleigh Regulatory Field Office 401 Wetlands Unit
3331 Heritage Trade Drive, Suite 105 1650 Mail Service Center
Wake Forest, North Carolina 27587 Raleigh, NC 27699
Reference: Morrisville Community Park Stream and Buffer Restoration Site
Stream Repair & Stabilization Efforts
Wake County, NC
Dear Mr. Shern and Mr. Kulz:
The purpose of this letter is to notify you of the completion of select stream repair and
stabilization activities associated with the stream channel at the above referenced project
site. Modifications to the stream channel were performed to repair areas of lateral
erosion, bed scour, overbank erosion, structure collapse, and back eddy scour.
Additionally, multiple beaver dams were removed.from the channel during construction.
The locations of the originally proposed and completed repairs are described on Figures
1-4. Photos describing the pre-construction and post-construction conditions at selected
locations are attached for your reference.
Stream repair and stabilization efforts were performed by North State Environmental
(NSE) of Winston Salem, NC, during the period July 8, 2008 through July 18, 2008. Soil
& Environmental Consultants, PA (S&EC) performed site visits during construction to
observe repair and stabilization activities and provide contractor guidance as necessary.
We have also performed site meetings before, during, and following construction with
various representatives of the Town of Morrisville including a site walk through on July
16, 2008.
Immediately following construction, areas disturbed with heavy equipment were seeded
and mulched to prevent erosion. Most repaired stream banks were stabilized with sod
mats following localized grading efforts. In areas where more extensive grading
(including the construction of a floodplain bench) was conducted, CF-7 coir and excelsior
Pagel of 2
Morrisville Community Park Stream and Buffer Restoration Site August 13, 2008
Soil & Environmental Consultants, PA Project No. 6798.1310
matting was used to provide temporary stabilization. In conjunction with stream bank
stabilization, NSE utilized live stakes of Black Willow (Salix nigra), a species which was
naturally common along the repaired stream reach before the repair effort. We expect
both the disturbed areas within the stream buffer and the stabilized portions of the stream
bank to naturally revegetate without conducting supplemental planting. However, as part
of this year's monitoring efforts we will assess these areas in late 2008. If at that time
supplemental planting of woody species is deemed necessary a supplemental planting
plan will be developed and implemented.
As of the date of our most recent site visit on Wednesday July 30, 2008, the proposed
repair and stabilization construction efforts appeared stable. Please be aware that the
fiscal year July 2008 through June 2009 will serve as Year 5 of the required monitoring
for the Morrisville Community Park Stream and Buffer Restoration Site. The repairs
made to the stream channel and the vegetation within disturbed areas will be inspected
periodically throughout the duration of the Year 5 monitoring effort.
Based on our site observations to date, it is our opinion that the stream stabilization
and repair work performed at the project site and as described above is in keeping
with our design intent. It is also our opinion that this work was performed in
general accordance with the construction activities described in the Morrisville Park
- Stream Repair and Stabilization Plan dated October 18, 2007.
We appreciate your assistance on this project to date. Please contact us if you have any
questions or comments regarding this letter.
Sincerely,
Sffl -&-KNVlRONM;EANTS, PA
Patrick K. Smith P.E. -
N.C. License No. 25525
Attachments:
1. Figures 1-4 - Restoration Site Layout & Repair Status
2. Pre-Repair vs. Post-Repair Photos (Pages 1 through 7)
Page 2 of 2
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S&EC Project No. 6798.D10
Before Stream Repairs- Photos taken May 18, 2007
August 6, 2008
rnoco a- typical uverdank Erosion, Before Repair
Page 1 of 7
Photo 1- Beaver Dam, Before Removal
S&EC Project No. 6798.D10
August 6, 2008
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Photo 3- Typical Lateral Erosion. Before Repair
Photo 4- Typical Bank Erosion, Before Repair
Page 2 of 7
S&EC Project No. 6798.D10
August 6, 2008
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rhoto 5- Lateral Erosion, Before Repair
Page 3 of 7
S&EC Project No. 6798.D10
After Stream Repairs- Photos taken July 30, 2008
August 6, 2008
Page 4 of 7
Photo 6- Typical Area Disturbed During Grading Operations,
Seeded and Straw Mulched Following Construction
Photo 7- Repaired Area of Lateral Erosion
S&EC Project No. 6798.D10
August 6, 2008
Page 5 of 7
Photo 8- Repaired Bank Erosion, Sod Mats Already Greening Up
Photo 9- Repaired Lateral Erosion, Banks Stabilized with Coir Matting and Live Stakes
S&EC Project No. 6798.D10
August 6, 2008
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Photo 10- Installed Live Stake- Black Willow (Salix nigra), Already in Leaf-Out
Page 6 of 7
Photo 11- Repaired Lateral Erosion, Floodplain Bench Graded and Banks Stabilized
S&EC Project No. 6798.D10
August 6, 2008
Page 7 of 7
Photo 12- Repaired Lateral Erosion, Sod Mats Already Greening Up