20151089 Ver 1_NOV Response_20171101

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PILOT ENVIRON M ENTAL, INC
November 1, 2017
U.S. Army Corps of Engineers
Attn: Mr. David Bailey
Raleigh Regulatory Field Office
Wilmington District U.S. Army Corps of Engineers
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
North Carolina Division of Water Resources
Attn: Ms. Sue Homewood
Winston-Salem Regional Office - 401 Wetlands Unit
450 West Hanes Mill Road
Winston Salem, North Carolina 27105
Reference: Response to Notice of Violations
SAW -2015-02200
Linville Ridge Road Crossing
Oakridge, Guilford County, North Carolina
Pilot Project 1745.2
Dear Mr. Bailey and Ms. Homewood:
Linville Oakridge, LLC received a "Notice of Unauthorized Activity/Permit Non -Compliance" from
the U.S. Army Corps of Engineers (USACE) dated August 7, 2017. Pilot Environmental, Inc. (Pilot),
on behalf of Linville Oakridge, LLC, has prepared this remedial plan to address the items outlined
within the notice. Additionally, Pilot was requested to provide construction oversight upon
approval of the plan by your office. The plan is based on telephone conversations between Mr.
Michael Brame with Pilot and Mr. David Bailey with the USACE. Pilot is requesting your review
and approval prior to remediation efforts. We appreciate your assistance. Please contact us at
336.708.4997 if you have any questions during your review.
Upstream of Crossing #2 - No rip -rap was to be placed in this area per the original approved plans.
The contractor is to remove all rip -rap within the stream restore stream grades as illustrated on
the attached drawings and specifications. The contractor shall install rock cross vanes to stabilize
the stream and prevent head -cutting due to the abrupt change in elevation. The contractor shall
install a bankfull bench to the extent possible to allow the wetland to reestablish and provide
overland flow during heavy rain events (see Drawing 5). All disturbed areas are to be covered
with jute matting and reseeded with a wetland mix seed to restore and stabilize the site. All work
is to be performed during periods where there is no flow.
PO Box 128, Kernersville, NC 27285
www.pilotenviro.com

Pilot Project 1745.2
November 1, 2017
Downstream of Crossing #2 - The plans called for rip -rap to be placed in the channel flush with
the channel bottom for a distance of 32 feet from the end of the pipe. The contractor shall
carefully remove all rip -rap beyond the 32 and regrade the stream banks. The contractor is to
install a bankfull bench as specified on the attached Drawing 5 and instructed by Pilot outside of
the existing stream channel and lay back the stream banks to the extent possible to match
existing contours. All excess material generated shall be wasted in upland areas. All disturbed
areas should be covered with jute matting and reseeded with a wetland seed mix to restore and
stabilize the site. All work is to be performed during periods where there is no flow.
Respectfully submitted,
PILOT ENVIRONMENTAL, INC.
David S. Brame, PWS
Project Manager
Attachments: Drawings 1-5
1L.1 -74w,
Michael T. Brame, PWS
Principal

. . . . . . . . . .
11
Legend
- Paved Roadway
Stream I
Endwall—Existing r
Stream Restoration Reach:
Rip Rap Removal Reach
RipRap
MaK
Drawing 1 Site Layout
Aerial Imagery from ESRI Linville Ridge Subdivision
and Pilot GPS Data wL Oak Ridge, Guilford County, NC
Scale: 1" = 50'
P1 Pilot Project 1745.2
P I L 0 T E N V I H 0 N M E N T A L I N

Legend
Paved Roadway
- Stream
�En a:f» /E » sting
H easu ?
_ Stream Restoration Reaeh
Pip RapRem al Reach
pPap
Drawing
Scale: 1` = 10'
Restoration Plan
Linville Ridge Subdivision
Oak gdRe, Guilford County NE
Pilot Project 1745.2

Proposed and Existing Longitudinal Profile A
9'
96
Top of Headwall
100
98
96
L
O 94
m
92
96
88
C
-1 4 9 14
SLaBuri (FL)
Proposed and Existing Cross Section
19
9 1- 15 20 25 30 35 40
RAM (Ft)
Lf, yd r
Drawing 3 - ILD,
"`
P L
0 i E N V I g 0 N M E N T A L. I N C
Station
Elevation Condition
-5
92.3
Existing Stream Channel
0
92.2
Riffle Begins
4
92.2
Cross Vane
4
91.53
Bottom Cross Vane
7
91.36
Bottom Pool
8
91.53
Cross Vane
8
90.86
Bottom Cross Vane
11
90.69
Bottom Pool
12
90.86
Cross Vane
12
90.2
Bottom Cross Vane
20
90.03
Bottom Pool
20
90.2
Culvert Invert
20
95.9
Headwall Top
20.5
95.9
Headwall Top
6 Existing
—6--propms d
Station
Elevation Proposed Condition
0
95
Existing Surface
6
94.72
Existing Surface
10
93.2
Proposed Grade
16
92
Stream Bank Channel
17
1 91.8
Stream Bed
19
91.8
Stream Bed
20
92
Stream Bank Channel
26
92.5
Proposed Grade
31
93.35
Existing Surface
35
93.85
lExisting Surface
� E.mstino
�p upuwj
Longitudinal and Cross
Section Profiles
Linville Ridge Subdivision
Oak Ridge, Guilford County, NC
Pilot Project 1745.2

Rock Cross -Vane Detail
• Construct cross vane structures by first shaping the bankfull channel to the grades specified, including scour pools
and bed substrate. Next, excavate enough bed material to place the boulders and bed material overlay. Placement
of boulders shall start at the center of the stream, or invert, and proceed outward to the banks. First, place footing
boulders and surface boulders at the channel invert and then check the elevations of the inverts. Once the inverts
have been established the remainder of the footing and surface boulders shall be placed tightly against each other,
minimizing voids. The vane arms of the cross vane shall slope up to the bank at the elevations and slopes indicated
on the drawings. Fill the voids on the upstream side of surface boulders with gravel such that water will flow over
the surface boulders rather than through gaps in the boulders. Hand placement of interstitial mix (bed material)
will be necessary to provide adequate filling of all voids between boulders.
Boulders ❑All boulders, including surface boulders and footing boulders, shall be no less than 12"x12"x24". All
boulders placed in the active channel between bankfull lines must be placed on a footing boulder.
Filter fabric shall consist of a nonFWoven geotextile fabric with a minimum weight of 8oz/sy.
Bed material aggregates shall be gravel or crushed stone. Aggregates shall be composed of clean, hard, durable,
mineral particles free from organic matter, clay balls, soft particles, or other substances that would interfere with
the draining properties of the aggregates. This material shall be placed with typical thickness of 12 inches. Either
use an approved stockipile of river alluvium or mix equal parts Riprap, 216 inch diameter (0.5 to 11 lbs.) and 57
stone, 1/23nch to 11/2 diamter. The surface of placed bedding material shall be thoroughly chinked and filled with
the smaller stones by scattering and tamping.
{
Drawing 4
Rock Cross Vane ` \
PILMT
P I L 0 i E N V I R 0 N M E N T A E. I n C
Construction Details
Linville Ridge Subdivision
Oak Ridge, Guilford County, NC
Pilot Project 1745.2

Typical view of constructed floodprone bankfull bench. Note the use of coir matting on lower stream channel banks.
• The contractor is to install a bankfull bench and lay back the stream banks to the extent possible to match existing
contours similar to the typical view shown above. The proposed stream channel shall be constructed by excavating
the flood prone area adjacent to the channel to the bankfull elevation as instructed by Pilot. All excess material
generated shall be wasted in upland areas.
• Disturbed areas shall be reseeded and covered with straw. A temporary and permanent seed mix shall be applied to
ensure immediate and long term vegetative cover. The bankfull sections should be reseeded with a wetland seed
mix.
• Disturbed areas subject to stream flow shall be covered with woven geotextile blanket composed of 100%
biodegradable, natural coconut (coir) fiber and staked in accordance with manufacturing specifications.
• The remaining disturbed areas shall be covered with coconut fiber erosion control coir surface blanket (0.5 lb/yd2).
Construction Details
Drawing 5
Typical Stream Channel Linville Ridge Subdivision
Oak Ridge, Guilford County, NC
and Bankfull Bench
Pilot Project 1745.2
P I L 0 i E N V I R 0 N M E N T A E. I n C