20051881 Ver 3_More Info Received_20081030 (2)

Environmental Consultants, PA
t • Concord, North Carolina 28025 • Phone: [phone] • Fax: [phone]
October 29, 2008
S&EC Project #4-1841wx
NC Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
RE: Stream Repair & Stabilization Measures for Impact S-1,
Piedmont Crossing Project,
High Point, NC
DWQ Project #05-1881 vpr2' -xxx 3
Dear Ms. Karoly,
?[4@ROWRP
OCT.1D 2008
DENR - WATER QUALITY
WETLANDS AhD STORMINATER BRANCH
I am forwarding the enclosed information at the request of Sue Homewood. The
information will be of benefit to DWQ's review of our latest PCN submittal for the
Piedmont Crossing project. A scanned copy of the information was forwarded via email
to Ms. Homewood and she has requested one copy (including color photos) be sent to
Central office.
Sincerely,
SOIL & ENVIRONMENTAL CONSULTANTS, PA
0.?C;W CQ
Wendell Overby, N icensed Soil Scientist
Environmental West Division Manager
Greensboro Office: Raleigh Office:
3817-E Lawndale Drive 11010 Raven Ridge Road
Greensboro, NC 27455 Raleigh, NC 27614
Phone: [phone]
Phone: [phone]
Fax: [phone] Fax: [phone]
Environmental Consultants, PA
t • Concord, North Carolina 28025 • Phone: [phone] • Fax: [phone]
October 28, 2008
S&EC Project No. 4-1841wx
USACE Raleigh Regulatory Field Office
Attn: Andrew Williams
3331 Heritage Trade Drive
Wake Forest, NC 27587
RE: Stream Repair & Stabilization Measures for Impact S-1,
Piedmont Crossing Project,
High Point, NC
Dear Mr. Williams,
Please let this letter serve as notification of the completion of the repair and stabilization
measures previously discussed at Impact S-1 of Piedmont Crossing in High Point, NC.
As discussed with you previously, S&EC prepared a preliminary plan for the repair and
stabilization of the area in question involving riprap removal and bank stabilization
measures (including minor bank grading, the installation of coir matting and'live stakes).
On October 20, 2008 representatives from S&EC met with the project owner, Mr. Ken
Lindholm, a representative from Sparks Contracting (the site grading contractor) as well
as Ravindra Bissram and Rich Glover from Jamestown Engineering to discuss the
proposed work. With the exception of the live stake installation the work was performed
the next day. The contractor removed 7 linear feet of riprap from the downstream
channel bed, removed riprap from the top of the banks, placed select fill material, and
stabilized the disturbed area with coir matting. Photographs showing site conditions both
before and after the above described work are attached for your reference.
Besides hand removal of riprap within the streambed, no filling/alteration of
jurisdictional Waters below ordinary mean high water occurred. Having removed riprap
from the streambed, channel impacts requiring mitigation for Piedmont Crossing are now
1481f. We request a modified 404 approval based on the repair and stabilization
measures performed. The last remaining mitigation measure, planting of live stakes
along the channel banks, will be performed within 1 month of this letter.
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
Raleigh Office:
11010 Raven Ridge Road
Raleigh, NC 27614
Phone: [phone]
Fax: [phone]
We appreciate your assistance to date on this project. Please contact S&EC if you have
questions or comments.
Sincerely,
SOIL & ENVIRONMENTAL CONSULTANTS, PA
l f?
C?
Wendell Overby, NC LU sed Soil Scientist
Environmental West Manager
Attachments: Site Photographs
CD of Photographs
S&EC Preliminary Repair & Stabilization Plans
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CHANNEL PROTECTIVE LININGS
BANKFULL BENCH
COIR MATTING
BASE FLOW ?.
WATER ELEVATION
12" EGO-STAKE O
24" ECO-5TAKE
PROFILE VIEW
• TRENCHED TOP OF MATTING TO A
DEPTH OF AT LEAST 12", STAKE
OR STAPLE IN PLACE, 4 BACKFILL
TO DESIGN GRADE
MINIMUM 24" ECO-5TAKE50
INSTALLED ALONG TOE OF MATTING
(Intercept between water surface and bank)
24" ECO- STAKE
12- ECO-STAKE
FRDNT VIEW
MINIMUM 2' CENTERS ALONG BOTTOM
MINIMUM P OVERLAP AT JOINING
5ECTIONS OF COIR MATTING
• 12" ECO-5TAKE5(g) INSTALLED IN BANK
FLU5H WITH COIR MATTING ABOVE
BOTTOM ROW OF 24" ECO-STAKES
• ECO-5TAKE5OSPACED AT
MAXIMUM 5 CENTERS (APPROX.)
COIR MATTING DETAIL
(NOT TO SCALE)
Grade area to be lined. Surface shall be free of obstructions, debris,
and pockets of soft or low density material. The rock or log weir
structures shall be completed prior to installation of the channel
protective linings.
Cover area with stockpiled topsoil to a depth of not less than 4
inches. Final grade with topsoil shall be as shown on Drawings.
Topsoil shall be prepared with fertilizer and lime, seeded and straw
mulched as described in PERMANENT SEEDING of these
Specifications.
CF-7 (CI 25) erosion control matting shall be installed over mulched
areas to anchor seedbed and in a direction perpendicular to the axis of
the stream. The matting shall be laid smooth and free from tension,
stress, folds, wrinkles or creases. Horizontal overlaps shall be a
minimum of 12 inches with the upper matting overlapping the lower
matting. Vertical overlaps in matting shall be a minimum of 12
inches with the upstream matting overlapping the downstream
matting.
The top (crest) edge of the matting shall be anchored in trench at least
12 inches deep to prevent undercutting of the matting, Trench should
be located a minimum of 24 inches from the top of bank, and shall
not alter channel or floodplain grade. Matting trench and Eco-
Stakes® (or equivalent) shall be installed as shown on Drawings.
Matting shall be anchored utilizing Eco-stake® (or equivalent) stakes
installed not more than 3 feet apart (3' on centers) and staggered, with
a minimum of 3 stakes per square yard of matting over the entire
lined area. 24-inch Eco-stakes® (or equivalent) shall be used along
the toe of the channel and 12-inch stakes shall be used within the
field and top edge of the matting as detailed on the Construction
Drawings. Along all laps (both vertical and horizontal) in the
matting, install a common row of staples at the seam, installing
staples on 1 foots (12 inch) centers. Along the toe, 24 inch Eco-
Stakes® (or equivalent) shall be spaced not more than 2 feet apart.
All stakes shall be driven perpendicular to the axis of the stream as
shown in Drawings. Care shall be taken to avoid damage to matting
material.
In the event that the matting is displaced or damaged during
installation, the matting shall be repositioned or replaced. This will
be done at no additional cost to the Owner.

All disturbed areas:
Species Rate Qs/acrel
Switchgrass (Panicum virgatum) 10
r'n
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t 1 5 G-rQQT SPACING
5PECJE5 COMMON NAME TOTAL # 512E KEM,,A
Carpus artc?mum &lky t)CVJW OJ Live stakes Nong streambankl
ml;wcue, cwwdensts Llderburry- Live stakes Along 5treambank5
.5a1ix sertcea Ilky 1?11110W Live 5ta1 t 5 Along streambanks

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BASE FLOW
WATER ELEVATION >..?
ANGLE-CUT END
PROFILE VIEW
'LIVE 5TAKE5 INSTALLED IN BANK
WITH DEAD-BLOW HAMMER
4/5 OF 5TAKE IN GROUND
BUDS ORIENTED UPWARDS
3' CENTER5 (APPROX.)
• CUT EXP05ED END OF LIVE STAKE
AFTER INSTALLATION IF DAMAGED
DUE TO INSTALLATION
(i.e. damaged bark, split ends, etc.)
LIVE STAKE PLANTING DETAIL
(NOT TO 5CALE)
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PLANT STAKES AND CUTTINGS
Plant stakes and cuttings if approved for use by the Engineer shall
consist of freshly cut live plants of select stock which has been
developed by proper cultural treatment. Stakes (live stakes) and
cuttings shall.be 3/8- to l-inch diameter and between 12 and 24
inches long and be reasonably straight. They shall be carefully cut
from mother-stock plantings. Plant materials shall be packaged,
transported, and handled in a manner that will prevent injury, drying
out, or freezing.
STREAM BANK PLANTING
Where plant stakes and plant cuttings shall be planted, they shall be
installed at a 45 to 60 degree angle in the direction of stream flow.
The buds of stakes and plant cuttings should point upward and about
6 inches of wood should be exposed above the ground surface. Tap
the surrounding soil firmly to eliminate air pockets.
Where stream bank planting is directed, areas shall be planted with
live stakes using 3-foot by 3-foot centers as shown on construction
Drawings.
Care should be taken to avoid planting stakes too deep or too
shallow, and to avoid damage to stakes during planting. Planting
depth should be in accordance with listed references and supplier
recommendations. Plant stakes and cuttings shall be kept cool and
moist to avoid damage and improve survivability.
y}k?.f}/ r1 pgj ,g n ? g @
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Coir Fiber Matting: Erosion control matting for streambanks shall be
CF-7 coir matting or equivalent material. Matting shall be 100% coir
fiber. Minimum Specifications for coir matting as follows:
Weight 20.6 oz/yd' (700 g/m2) ASTM-D3776
Thickness 6.34 mm
Water Velocity 10 t1/s
Grab/Elongation (Dry) I I5.81bs/23.9% MD ASTM-D4594
54. 1 lbs/33.5% XD
Manning's n 0.0294
Max Shear Stress 4.46 ib/f 2
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Eco-Stakes® or equivalent: Shall be of hardwood, out from sound
solid trees and free from defects that would impair the strength of the
stake. Stakes shall be cut to the minimum length of 12-inches and
24- inches and shall contain no unsound knots. One end shall be cut .
to provide a point; the opposite end shall be cut square with an
overlapping tongue so as to provide hold on the anchored matting.
24-inch stakes shall be used along the toe of the channel and 12-inch
stakes shall be used within the field and top edge of the matting as
detailed on the Construction Drawings.

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