20181707 Ver 1_Summary of Buffer Impacts_Feb_20190207

THE UNIVERSITY
Qr
of NORTH CAROLINA
of CHAPEL MILL
SUMMARY OF BUFFER IMPACTS
UNC — Outdoor Education Center
Pond Retrofit Project
Project is in Jordan lake basin.
Impact tables per Pre -Construction Notification Form
A EWELL
qP EN GI NEE Ft i NG CONSLILTANT9, PC
6b. Impact Type
6c. Per
6d. Stream
6e. Buffer
6f. Zone 1
6g. Zone 2
or
name
mitigation
impact
impact
Temp
req'd?
(sq. ft.)
(sq. ft.)
Concrete Golf Tee
P
Pond/UT to
No
-46
+46
(no net impact- did not
Chapel Creek
include in totals)
Viewing Platform (water
P
Pond/UT to
No
99
0
dependent structure) -
Chapel Creek
allowable
Wetland Restoration
P
Pond/UT to
No
12,734
2,932
(Excavation/Fill/Outlet) -
Chapel Creek
exempt
Stream Restoration -
P
UT to Chapel
No
1,153
0
exempt
Creek
Grading and Revegetation
P
UT to Chapel
No
0
4,535
(apart from Wetland
Creek
Restoration) - allowable
Temporary Roads/Erosion
T
Pond/UT to
No
6,496
5,212
Control Devices --
Chapel Creek
allowable
6h. Total buffer impacts
Permanent 13,626 s.f. 7,467 s.f.
Temporary 6,496 s.f. 5,212 s.f.
Total 20,122 s.f. 12,679 s.f.
Corresponding Impact Descriptions
Permanent Impacts:
Much of the proposed pond retrofit/wetland restoration project will occur within the buffers of either
the existing open water area or the existing streams upstream and downstream of the pond/wetland
area.
February 6, 2019

ati THE UNIVERSITY EWELL
Ill of NORTH CAROLINAqP
of CHAPEL MILL ENGINEERING CONSULTANTS, PC
The impacts for the wetland restoration include removal of some trees as shown on the plans, clearing
and grubbing, removal of accumulated sediments, regrading to establish appropriate wetland
topography, outlet control structures, and repairs and improvements to the existing dam.
There is an existing concrete golf tee pad, which will be removed and replaced by installation of a pad of
the same size and type on the other side of the proposed wetland. The existing golf tee is within Zone 1,
but the future golf tee will be located within the area currently within Zone 2 of the pond buffer. This
relocation is noted for the record, but will result in no net buffer impact.
A wooden deck/viewing platform is proposed for installation within the wetland and a portion of the
access ramp will be within the Zone 1 buffer for the existing pond. The purpose of the viewing platform
is to educate groups about the wetland and the impact is necessary for the access to the wetland.
The area shown on Figure 1 as "Grading and Revegetation" will have some minimal fill as sediment
removed from the pond is placed along the tree line to develop a raised pedestrian path, with a
connection over to the zipline landing platform at the edge of Zone 1. Most of the impact within the
Zone 2 area will be placement of silt fence and use of that side of the disturbed area as a path for trucks
placing the sediment. All of the disturbed area will be revegetated and stabilized with grass. This is not
a change of use because the area is used for pedestrian traffic now and the intent is only to build up an
intentional pathway using some of the soil material removed from the pond. A series of 4" PVC pipes
will be placed at appropriate points under the path to maintain existing diffuse flow patterns through
the buffer.
The wetland restoration Zone 1 and Zone 2 impact areas, the existing and proposed golf tee locations,
the viewing platform, and the impact area for the pedestrian path are all shown on Figure 1.
The stream restoration in the upstream reach to address an existing headcut will also impact Zone 1 of
the existing stream, as depicted in Figure 2.
Temporary Impacts:
Figure 1 and Figure 2 also show some areas where the contractor may need to have temporary roads for
access to the project areas and/or may place erosion devices such as silt fence or filtration bags. For the
pond retrofit, the contractor will utilize the existing gravel road and asphalt path but the asphalt path
will likely not be quite wide enough to accommodate the necessary equipment for the project
construction. The Zone 1 temporary impact downstream on the fairway will be limited to placement of
silt fence around the zipline landing platform. We expect that the contractor will establish paths for
construction access from the staging areas to the stream or pond such that some portions of the marked
areas may be considered as a temporary impact for a road which will need to be revegetated at the end
of the project. The contractor is not permitted to build a temporary road in the sense of placing any
gravel or asphalt except that any damaged portions of the existing asphalt path are to be replaced as
gravel of the same width upon project completion.
February 6, 2019

Summary of Impacts
Permanent Impacts
Zone 1 -Stream Restoration
Temporary Impacts
Zone 1 Temporary Roads/Erosion Control Devices
Zone 2 Temporary Roads/Erosion Control Devices
Surveyed Top
of Strean�ks �'�`,.
MU
0 10
i.O*,,A
Existing Stream
Feet
20 40
Limits of
Disturbance
Buffer Impacts Figure 2
Stream Restoration Area
Date: Feb 2019 I s EWELL
ENGINEERING CONSULTANTS. PC