20210643 Ver 1_Pre-Filing Meeting Request_20210328

DWR Pre -Filing Meeting Request Form
ID#*
Regional Office*
Reviewer List*
20210643
Version *
1
Raleigh Regional Office - [phone]
Stephanie Goss
Pre -Filing Meeting Request submitted 3/28/2021
Contact Name *
Contact Email Address*
Project Name*
Project Owner*
Project County*
Owner Address:
Wyatt I brown
[e-mail]
Willowbrook Stream Repair
WILLOWBROOK HOMEOWNERS ASSOCI
Johnston
Street Address
14100 POSSUM TRACK ROAD
Address Line 2
City State / Rovince / Region
Raleigh North Carolina
Fbstal / Zip Code Country
27614 United States
Is this a transportation project?* r Yes (' No
Type(s) of approval sought from the DWR:
fJ 401 Water Quality Certification - I— 401 Water Quality Certification -
Regular Express
I— Individual Permit I— Modification
r Shoreline Stabilization
Does this project have an existing project ID#?*
r Yes (' No
Do you know the name of the staff member you would like to request a meeting with?
Stephanie Goss, Rick Trone (I have discussed with
Stephanie)
Please give a brief project description below and include location information. *
The bank of the stream has eroded well into the bank getting
dangerously close to inhabited condos. This repair should stabilize
the bank and stop the erosion.
Please give a couple of dates you are available for a meeting.

4/14/2021
4/15/2021
Please attach the documentation you would like to have the meeting about.
c-00 property information (3).pdf
c-1 existing conditions (2).pdf
c-2 Proposed Retaining Wall and (2).pdf
C-3 Stream Cross -Sections (1).pdf
c-4 retaining wall cross-sectio (1).pdf
D-1 Retaining Wall Details.pdf
D-2 Erosion control Details (1).pdf
site photos.pdf
pdf only
7.12MB
595.79KB
713.46KB
267.63KB
543.76KB
2.84MB
678.47KB
1.19MB
By digitally signing below, I certify that I have read and understood that per the Federal Clean Water Act Section
401 Certification Rule the following statements:
• This form completes the requirement of the Pre -Filing Meeting Request in the Clean Water Act Section 401 Certification
Rule.
• I understand by signing this form that I cannot submit my application until 30 calendar days after this pre -filing
meeting request.
• I also understand that DWR is not required to respond or grant the meeting request.
Your project's thirty -day clock started upon receipt of this application. You will receive notification regarding meeting location
and time if a meeting is necessary. You will receive notification when the thirty -day clock has expired, and you can submit an
application.
Signature
Submittal Date 3/28/2021

Vicinity Map
Scale: 1" = 1000'
USGS Garner and Clayton Quadrangle Maps
2016 Garner Qu
a• rangle
p
201'.p ClayteiZQuadrangle
Scale: 1" = 1000'
Scale: 1" = 1000'
—1-
USDA Soil Survey
Soil Symbol
Soil Name
Hydrologic
Group
Seasonally High
Water Table
RnF
Rion
B
>6.0'
WoB, WoD
Wedowee
B
>6.0'
UcC
Uchee
A
3.5'-5.0'
NkB
Nankin
C
>6.0'
Ra
Rains
B/D
0'-1.0'
NoA, NoB
Norfolk
B
4.0'-6.0'
FOREST DR
TRDR 'I
Project Discussion
Stream bank erosion is occurring adjacent to two (2) residential buildings, and if left unchecked,
could undermine the deck structures. Approximately 102 lineal feet of Gabion Wall
will be constructed to stabilize the stream bank.
To protect the work area and minimize sediment issues, the water flow in the stream will be
minimized by lowering the upstream pond to store runoff during rain events. A
rock check dam will be constructed down stream of the proposed disturbance. All work will be
conducted within the Willowbrook Home Owners common property. Total land disturbance is
0.13 acres (5,667 SF).
The retaining wall with a maximum height of 4.5 ft. is designed to withstand a 100 year rain event
and has a Factor of Safety of more than 2 against overturning and sliding.
SCHEDULE OF SPECIAL INSPECTIONS
IT-4 MODULAR RETAINING WALLS (NCBC SECTION 1704 AND 1807.2.5)
ITEM
MONITORING
NOTES AND SCOPE
MATERIAL VERIFICATION
PERIODIC
PERIODIC
• VERIFY GABION STONE FILL, AND FILTER FABRIC
• VERIFY GABION , LASING AND TIE WIRE TYPE AND SIZES
FOUNDATIONS
PERIODIC
CONTINUOUS
• PERFORM SOIL TESTING OF FOUNDATION AREA
TO VERIFY ADEQUATE BEARING CAPACITY
• VERIFY THICKNESS AND WIDTH OF RETAINING WALL LEVELING PAD
STRUCTURAL FILL
CONTINUOUS
• VERIFY USE OF PROPER SOIL, DENSITIES, MOISTURE CONTENT,
AND LIFT THICKNESSES DURING PLACEMENT AND COMPACTION
OF STRUCTURAL FILL
WALL CONSTRUCTION
PERIODIC
PERIODIC
• VERIFY INSTALLATION OF GABION BASKETS
• VERIFY LACING AND TIE WIRE LOCATIONS AND INSTALLATION
IN ACCORDANCE WITH SECTION 1704 OF THE NORTH CAROLINA BUILDING CODE, RETAINING WALLS WITH A CUMULATIVE VERICAL RELIEF
GREATER THAN 5 FEET IN HEIGHT WITHIN A HORIZONTAL SEPARATION DISTANCE OF 50 FEET OR RETAINING WALLS LESS THAN 5 FEET IN
CUMULATIVE VERTICAL RELIEF AND ADJACENT TO STRUCTURES LOCATED CLOSER THAN THE VERTICAL RELIEF REQUIRE SPECIAL
INSPECTION TESTING. THE OWNER SHALL ENGAGE A QUALIFIED 3RD PARTY INDEPENDENT TESTING AGENCY TO CONDUCT SPECIAL
INSPECTIONS IN ACCORDANCE WITH SECTION 1807.2.5 OF THE NORTH CAROLINA BUILDING CODE FOR THE SITE RETAINING WALL(S)
PROVIDED ON THESE PLANS. AFTER CONSTRUCTION, A SUMMARY OF THE SPECIAL INSPECTION TESTING SHALL BE PROVIDED BY THE
TESTING AGENCY TO THE BUILDING OFFICIAL AND THE DESIGN PROFESSIONAL IN RESPONSIBLE CHARGE FOR THE FINAL REVIEW.
Drawing List
C-00 Property Information
C-1 Existing Conditions
C-2 Proposed Retaining Wall and Erosioin Control
C-3 Stream Cross -Sections
C-4 Retaining Wall Cross -Sections
D-1 Retaining Wall Details
D-2 Erosion Control Details
Property Owner:
Willowbrook Homeoners Association
3815 Barrett Dr.
Raleigh, NC 27609
Attn: Victor Jones/Willowbrook HOA Manager
Property Information:
Parcell Id: 05G01192E
N C P I N :174004-82-4693
Book/Page: 01197/0101
Acreage: 0.610 acres
Address: Not Asigned
ENGINEERING & ENVIRONMENTAL
C SCIENCE COMPANY
3008 Anderson Drive
Raleigh, NC 27609
[phone]
02/17/21
Property Information
Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
02/17/21
DRAWN:
TPS
REVISED:
SCALE:
See Drawings
Sheet No.

Willowbrook HOA
NCPIN: 174004-82-
x102.36
101.68
x
100.33 x.
x 94.27
99.61 x
x 97.35
x 98.29
101.82 x
•i
0
Paved Parking Lot
Gaped Area
Invert Elevation: 84' (Approx.)
98.89 x
Scale: 1 "=10'
10
20
99.49 x
Michael M Leham
2009 Willow Hill Ln
Clayton NC 27520
NCPIN: 174004-82-4697
94.45 x
Chana D Perrell
2005 Willow Hill Ln
Clayton, NC 27520
NCPIN: 174004-82-4699
x 96.40
98.78 x
x 96.40
x98.78
x
90.37
S fin
amine
x
90.95
94.67
x
x94.94
x
96.52
LEGEND
x 96.40
Existing Toe of Stream Bank
Exisiting Top of Bank
Topo Lines
Spot Elevations
Property Line
Tree Line
ENGINEERING & ENVIRONMENTAL
6,, SCIENCE COMPANY
3008 Anderson Drive
Raleigh, NC 27609
[phone]
Existing Conditioins
Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
02/17/21
DRAWN:
TPS
REVISED:
SCALE:
See Drawings
Sheet No.

Center Reference Line
0
N
a-
100.33
^102.36
101.68
x 94.27
99 61x
Cross-Section 1
Scale: 1 "=10'
10
20
98.29
101.82 x
Paved Parking Lot
Willowbrook H
NCPIN: 004-82-4693
Cross -Section 2
aped Area
oa• 'etainin
99.51
C/O Stock Piled S
0
Elevation:84' A
93.49 -----
98.89
Cross -Section 3
92.94
99.49
Cross-Sectio
Michael M Leham
2009 Willow Hill Ln
Clayton NC 27520
NCPIN: 174004-82-4697
House
X 92.36
94.45 -
Cross -Section 5
Limits of Distur
0.29
m
Chana D Perrell
2005 Willow Hill Ln
Clayton, NC 27520
NCPIN: 174004-82-4699
House
98.78
Cross -Sec
Retaining Wall
0 0 0 0 0 0
ooa0000
0 0 0 0 0 0
0 0
0 0
Remove
96.40
98.78
Cross -Section 7
0
x96.40
LEGEND
Existing Toe of Stream Bank
-- -- Exisiting Top of Bank
Existing Topo Lines
Spot Elevations
Property Line
Proposed Retaining Wall
Limits of Disturbance
Existing Tree Line
Construction and Erosion Control Sequence
1. Install silt fence below soil borrow area.
2. Construct downslope rock check dam.
3. Remove existing wood pedestrian bridge.
4. Start construction of retaining wall.
5. Re -vegetate all areas disturbed. Use excelsior on stream banks.
6. Spread rock from downslope check dam uniformly along the stream.
_ _a-4.59
35
X 92.46
Center Reference Line
94.94
96.52
Cross -Section 8
ENGINEERING & ENVIRONMENTAL
6,, SCIENCE COMPANY
3008 Anderson Drive
Raleigh, NC 27609
[phone]
Proposed Retaining Wall
And Erossion Control
Measures
Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
02/17/21
DRAWN:
TPS
REVISED:
SCALE:
See Drawings
Sheet No.

CROSS-SECTION 1
CROSS-SECTION 2
105
100
95
90
85
25
105
100
95
90
85
25
20
15
10
5
0
5
10
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25
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20
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105
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95
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105
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25
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abion
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-year
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5
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15
20
25
40
45
Existing Ground Level
Proposed Ground Level
Horizontal and Vertical Scale: 1 "=5'
ENGINEERING & ENVIRONMENTAL
2 C SCIENCE COMPANY
3008 Anderson Drive
Raleigh, NC 27609
[phone]
Stream Cross -Sections
Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
02/17/21
DRAWN:
REVISED:
SCALE:
See Drawings
Sheet No.

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ENGINEERING & ENVIRONMENTAL
2C SCIENCE COMPANY
DATE:
02/17/21
3008 Anderson Drive
Raleigh, NC 27609
6 [phone]
DRAWN:
TPS
02/17/21
an
Retaining Wall Cross -Section
REVISED:
�04
$y;
''�'
` Q �
SCALE:
See Drawings
SEAL
Z. t 15472 / _
_,AN _;
%�.o,� FNGItdEE�/����`
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Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
Sheet No.
C-4
of:

WORK DISCRIPTION
EXECUTION
A. Retaining Wall:
1. Work consists of furnishing and construction of 102 lineal feet of Gabion Retaining Wall System
in accordance with the specifications and in reasonable close conformity with the lines, grades
design and dimensions shown on the plans.
B. Earthwork:
1. Preparing foundation soil subgrade to the lines and grades shown on the drawings.
2. Furnishing and installing leveling pad to the lines and grades shown on the drawings.
3. Prepare final soil subgrade after retaining wall installation to the lines and grades shown on the
drawings.
C. Erosion Control:
1. Although an erosion control permit is not required, a stone check dam shall be installed
downslope of the disturbance, and any soil excavated to install the retaining wall shall have a silt
fence install downslope of stockpiled soils.
2. All disturbed areas will require revegetation as per the plans.
D. Surface Water Control:
1. An existing pond is located approximately 600 ft. upslope of the retaining wall installation.
The contractor will coordinate with the Engineer, T. Patrick Shillington, P. E., to ensure that the
pond water level is sufficiently lowered to reduce stream flow through the construction site. The
Willowbrook Home Owner's Associations shall be responsible for lowering the water level in the
pond.
2. During installation of the leveling pad, some dewatering is expected by the contractor.
MATERIALS
A. Gabion Baskets:
1. Gabion baskets shall consist of twisted hexagonal mesh meeting ASTM A975. Hexagonal
openings shall not exceed 3 inches. The mesh wire shall be galvanized steel and have a diameter
of 0.120 inches. (11 Gage).
2. Selvedge galvanized wire shall have a diameter of 0.150 inches (9 Gage).
3. Lacing and tie galvanized wire shall have a diameter of 0.87 inches (13.5 Gage).
4. All galvanized wire shall conform to ASTM A510, grade number 1006 through 1020. Wire
shall have a minimum tensile strength of 60,000 psi, and a Class 3 coating conforming to ASTM
A 641. The galvanized coating shall be applied by the hot dip process in accordance with ASTM
A 385 and ASTM A 386.
B. Filter Fabric:
1. Filter Fabric shall be used to separate the No. 57 Stone and the Gabion Stone Fill from the
native soil and soil backfill. The Filter Fabric shall be minimum 4.0 oz/sy, polypropylene, needle -
punched nonwoven fabric.
C. Leveling/Foundation Base:
1. The leveling/foundation base shall consist of No. 57 Stone as defined by NCDOT.
D. Gabion Stone Fill:
1. Gabion stone fill shall consist of Class B Erosion Control Stone as defined by NCDOT.
E. Soil Backfill:
1. Native soil excavated to install the Gabion Wall can be re -used for backfill behind the wall.
2. The backfill shall be placed in 6 inch loose lifts and compacted to 92% of Standard Proctor
Maximum Dry Density (ASTM D-698).
3. Initial compaction may require mechanical hand operated equipment.
FIELD QUALITY CONTROL
A. Quality Assurance - The Owner shall/may engage inspection and testing services, including
independent laboratories, to provide quality assurance and testing services during construction.
This does not relieve the Contractor from securing the necessary construction quality control
testing. Quality Assurance should include foundation soil inspection, verification of geotechnical
design parameters and verification that the contractor's quality control testing is adequate as a
minimum. Quality Assurance shall also include observation of construction for general compliance
with design drawings and project specifications.
B. The wall contractor shall correct work that does not meet these specifications or the requirements
shown on the Drawings at the wall contractor's expense.
C. Quality control testing shall include soil and backfill testing to verify soil types and compaction and
verification that the retaining wall is being constructed in accordance with the design plans and project
specifications. The compaction test locations should vary and cover the entire area of the reinforced
soil zone, including the area compacted
A. Examination:
1. Prior to commencing work, the retaining wall contractor shall examine the areas and conditions under
which the retaining wall system is to be erected, and notify the [Architect] [Engineer] [Owner] [General
Contractor] in writing of conditions detrimental to the proper and timely completion of the work. Do not
proceed with the work until unsatisfactory conditions have been corrected.
2. Promptly notify the wall design engineer of site conditions which may affect wall performance, soil
conditions observed other than those assumed, or other conditions that may require a reevaluation of
the wall design.
3. Verify the location of existing structures and utilities prior to excavation. Ensure surrounding structures
are protected from the effects of wall excavation. Excavation support, if required, is the responsibility
of the Contractor, including the stability of the excavation and its influence on adjacent properties and
structures.
B. Excavation and Foundation Soil Preparation:
1. Contractor shall excavate to the lines and grades shown on the construction drawings.
2. The Project Geotechnical Engineer will examine foundation soil to ensure that the actual
foundation soil strength meets or exceeds that indicated on the drawings. At the direction
of the project geotechnical engineer, remove soil not meeting the required strength, and
will determine if the foundation soils will require special treatment or correction to
control total and differential settlement.
C. Leveling Pad:
1. Leveling pad material shall be placed to the lines and grades shown on the construction drawings.
2. Leveling pad shall extend a minimum of 6 inches beyond both the front and back of the lower most
gabion units.
3. Leveling pad materials shall have a minimum thickness of 8 inches and consist of No. 57 stone as
defined by NCDOT.
4. Final surface of Leveling pad shall be prepared to insure full contact to the base surface of the
concrete Facing Units and have a tolerance within +/- 1 inch over a 10 foot span.
D. Gabions:
1. Gabions shall be fabricated in such a manner that the sides, ends, lid and diaphragms can be
assemble at the construction site into the baskets of the sizes specified:
3 ft. wide, 3 ft. long, 3 ft. high
4.5 ft. wide, 3 ft. long, 3 ft. high
2. Lacing wire shall be used for both the assembly of baskets and connecting baskets together.
The lacing procedure consists of cutting a length of wire approximately 1.5 times the distance to
be laced (not to exceed 5 ft.), securing one end of the wire at the corner by looping and twisting,
alternately lacing with single and double loops at approximately four (4) inch intervals, and
securing the other end of the wire to selvedges by looping and twisting.
3. Placing gabions shall consist of installing baskets to the lines and grades shown on the drawings.
Gabions shall be securely tied to each adjoining gabion with lacing wire along the vertical
reinforced edges and top selvedges. Empty gabion sections stacked on a filled gabion shall be
tightly laced to the filled lower section along the front and back. For the end sections only, the
layer of empty gabions placed on top of the filled gabions must be wired to the latter at the front,
back and lateral edges.
4. The gabions shall be carefully filled with rock, by either machine or hand placement to ensure
alignment, avoid bulges, and provide a compact mass with minimum voids. Machine placement
may have to be supplemented with hand work to ensure a neat, compact, and square appearance.
A stretcher, block and tackle, come -along, ect. may be used to stretch the wire baskets and hold
alignment during the filling process.
5. Cells in rows shall be filled in stages such that the depth of rock placed in any cell does not
exceed the depth in an adjoining cell by more than one (1) ft.
6. Stone filling shall be conducted in 12 inch lifts.
7. During stone filling, the tie wires shall be installed per the Gabion Tie Wire Detail. All tie
wires shall be looped around three (3) mesh openings and the ends of the wires shall be securely
twisted with a minimum of five (5) twists after looping.
Internal Radius
Joint
Face of Wall
Leave End Panel Flat
Joint
Notes:
1. For interior curves leave one end down and fix the adjacent gavion to the rear vertical of the adjacent gabion.
2. For exterior curves leave one end down and fix adjacent gavion to the front verical of the adjacent gavion.
External Radius
Face of Wall
Leave End Panel Flat
Gabion Curve Construction Detial
Plan View (NTS)
SEE LACING DETAIL FOR
LACING LIP DOWN -
LACE FRONT,
SIDE tiBACK
i
.1145111.7ABIONS404 "41100 TOGETHER
TWISTED WIRE MESH ---
DOUBLE LOOP
Selvedge Wire
CONTINUOUS
TIE WIRE
TO NEXT
SINGLE LOOP.
Lacing Locations (NTS)
SINGLE LOOP
Filter Fabric
3'
3'
36"
1
12"
12"
12"
36"
36"
End Gabion
Adjacent Gabion
_
1----_1-
-
Ties
k
36"
Front Perspective View (NTS)
36"
1
\/
V
V
12"
End Gabion
Adjacent Gabion
'6"
12"
Ties
12"
/\
/\
/\
19"
12"
12"
12"
12"
12"
Stream Bed
4" NOMINAL
SPACING
Lacing Detail (NTS)
Ground Surface
Native�Stoil Used For
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
Standard P ctoN f\
ASSTMw 698)
Oo0 °O0 °0 0 °000
nmICS
Ow0 °L 0'00wc) L ' L
° 0 • •CD 0OC�0OC�0O���OC� • •CD
0 •0 •0 •0 •0 •0
b
0 0 0 0 0
4e1106
Q Q Q Q Q Q
Doccloclop0000cloo
8"
4.5'
5.5'
Gabion Retaining Wall Cross -Section (NTS)
Plan View (NTS)
Gabion Tie Wire Detail (NTS)
Internal Connecting Wires
Shall Encompass 3 Mess
Spaces
Internal Tie Wire Connection Detail (NTS)
E�s
02/16/21
1 SEAL r--
15472
'%,�A9FNG1NEEe \Gt�
ENGINEERING & ENVIRONMENTAL
SCIENCE COMPANY
3008 Anderson Drive
Raleigh, NC 27609
[phone]
Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
DATE:
02/16/21
DRAWN:
TPS
REVISED:
SCALE:
NTS
Sheet No.
D-1

CLASS B EROSION
CONTROL STONE
Downslope Rock Check Dam Details (NTS)
CROSS SECTION
5'
3.5
3
0000000000000000000
. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
aoe0000000000000000000000000
+00000000000000000000000000000
000000000000000000000000000000000
4000000000000000000000000000000000000
0000000000000000000000000000000000000000
+0000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000
.000000000000000000000000000000000000000000000000000000
. 000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000
. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
.00000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000 Q 00000000000000000000000000
1
)00000000000000C A 000000000000000000000000
000000000000000 1.5 0000000000000000000000
) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C 000000000000000000000
0000000000000000000
4' 0
0
o0
o000000000000
00000000000000
000000000000
FILTER FABRIC' 0000000000
2'
lft. THICK No.57 STONE
FLOW DIRECTION
SEED BED PREP AND SEEDING SCHEDULE.
PERMANENT SEEDING MIXTURE FOR AREAS 3:1 AND FLATTER
5.0
3
00
00000
000000000000000000000000000000
FRONT VEIW
0000000000000000000000000000
000000000000000000000000000
00000000000000000000000000
0000000000000000000000000,
0000000000000000000000000
00000000000000000000000
36'
0
0000
)000000000000000000000000 0000000
00000000000000000000000000000000
)000000000000000000000000000000
000000000000000000000000000000
000000000000000000000000000000
D 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0000000000000000000000000000
00000000000000000000000 0000000000000000000000000
00000000000000000000(lc 00000000000000000000000000
0000000000000000000000000
000000000000000000000
000000000000000000000
0000000000000000000
000000000000000000
00000000000000000,
0000000000000000
000000000000000000000000
00000000000000000000000
)00000000000000000000
000000000000000000000
000000000000000000000
FILTER FABRIC
Maintenance Notes:
Check the embankment for erosion damage. Replace No. 57 Stone
when clogged by sediment. Make all neacessary repairs immediately.
SPECIES RATE (LB./ACRE)
TALL FESCUE
TALL FESCUE AND ABRUZZI RYE
TALL FESCUE
COMMON (HULLED) BERMUDA
TEMPORARY SEEDING MIXTURE
300
300
300
25
OPTIMUM PLANTING TIME
AUGUST 15-NOV 1
NOV 1-MARCH 1
MARCH 1-APRIL 15
APRIL 15-JUNE 30
*RESEED ACCORDING TO OPTIMUM PLANTING TIMES IN PERMANENT SEEDING SCHEDULE.
ALLOW TEMPORARY COVER TO GET NO MORE THAN 12" HT. BEFORE MOWING.
SPECIES RATE (LB./ACRE)
DATE
TALL FESCUE AND
BROWNTOP MILLET (OR)
SORGHUM-SUDAN HYBRIDS
35 TOTAL
JULY 15-AUGUST 15
PERMANENT SEEDING MIXTURE FOR AREAS 3:1 TO 2:1
SPECIES
RATE (LB./ACRE)
SERICEA LESPEDEZA (SCARIFIED) 50
AND ADD
TALL FESCUE 120
OR ADD
WEEPING LOVE GRASS 10
OR ADD
COMMON (HULLED) BERMUDA 25
BERMUDA (UNHULLED) 30
PERMANENT SEEDING MIXTURE FOR AREAS 2:1 AND STEEPER
OPTIMUM PLANTING TIME
MARCH 1-JUNE 1
MARCH 1-JUNE 1
MARCH 1-JUNE 30
MARCH 1-JUNE 30
DEC 30 - APRIL 1
SPECIES RATE (LB./ACRE)
WEEPING LOVE GRASS 40
TEMPORARY SEEDING MIXTURE
OPTIMUM PLANTING TIME
MARCH 1-JUNE 30
*RESEED ACCORDING TO OPTIMUM PLANTING TIMES IN PERMANENT SEEDING SCHEDULE.
ALLOW TEMPORARY COVER TO GET NO MORE THAN 12" HT. BEFORE MOWING.
SPECIES RATE (LB./ACRE)
DATE
TALL FESCUE
BROWNTOP MILLET (OR)
SORGHUM-SUDAN HYBRIDS
120
35
30
JUNE 1-SEPT 1
SERICEA LESPEDEZA (UNHULLED UNSCARIFIED)
AND TALL FESCUE
SORGHUM-SUDAN HYBRIDS
70
120
30
SEPT 1-MARCH 1
* ADD ABRUZZI RYE
25
NOV 1-MARCH 1
SOIL AMENDMENTS SHALL BE TILLED OR OTHERWISE MIXED TO 8" DEPTH PRIOR TO SEEDING
THE TOP 3" SHALL PULVERIZED TO PROVIDE A UNIFORM SEED BED.
HARD PAN SHALL BE CHISLED WITH SOIL SCARIFIER IF CONDITIONS WARRENT BY ON SITE INSPECTION.
ALL ROCKS AND DEBRIS SHALL BE REMOVED PRIOR TO FERTILIZING AND SEEDING EXPOSED AREAS.
UNLESS INDICATED OTHERWISE BY SOIL TEST REPORT:
APPLY AGRICULTURAL LIMESTONE AT A RATE OF 95 LBS PER 1000 SF
APPLY FERTILIZER AT A RATE OF 21 LBS PER 1000 SF (5-10-10).
MULCH
MULCH - 70 LBS PER 1000 SF - SMALL GRAIN STRAW OR EQUIVALENT COVER.
ANCHOR - ASPHALT EMULSION ON MULCHED AREAS @ 200-400 GAL./ACRE (TYPE R.S.)
MAINTENANCE
REFERTILIZE AT THE END OF THE WARRANTY PERIOD ACCORDING TO NC COOP EXT SVC. RECOMMENDATIONS
MOW TO 3" HT. WHEN AVERAGE HT. OF GRASS BECOMES 5".
RE -DISK, APPLY SOIL AMENDMENTS AND RESEED & MULCH DAMAGED OR DEAD AREAS IMMEDIATELY.
CLASS B EROSION
CONTROL STONE
Minimum 10 Gauge Line Wires
Cross -Section
SILT FENCE DETAILS
Minimum 12 - 1/2 Gauge Intermediate Wires
8' MAXIMUM
(variable as directed by the engineer)
Grade
3' - 0"
2'-0"
Silt Fence Specifications
1. Steel posts shall be a minimum of 5 ft. long, weigh a minimum of 1.3 lb/ft, and
have projections to aid in fastening the wire or fabric. Steel posts shall also
have a metal plate welded near the bottom such that when the post is driven
to the proper depth, the plate will be below the ground level for added stability.
2. Woven Wire Fence shall conform to the requirements of ASTM A 116,
Class I zinc coating for wire. The fence shall be at least 32 in. high and shall
have at least 6 line (horizontal) wires. Stay (vertical) wires shall be spaced
12 in. apart. The top and bottom wires shall be 10 gage. All other wires shall
be 12 1/2 gage.
3. Filter Fabric shall be composed of fibers consisting of long chain synthetic
polymers composed of at least 85% by weight of polyolefins, polyesters, or
polyamides. The fibers shall be formed into a network such that the filaments
or yarns retain dimensional stability relative to each other. The filter fabric shall
be free of any treatment or coating which might adversely alter its physical
properties after installation. The fabric shall be free of defects or flaws which
significantly affect its physical and/or filtering properties. The fabric shall have
a minimum width of 36 inches.
The filter fabric shall be furnished with suitable wrapping for protection against
moisture and extended ultraviolet prior to placement.
EXCELSIOR DETAILS
(NTS)
Exclelsior
Channel Bottom
Steel Post
Woven Wire Fabric
Silt Fence Geotextile Fabric
Grade
8\ 8" Minimum Cover over Skirt *
4" Minimum horizontal turn
The filter fabric shall meet the following minimum physical requirements:
PROPERTY*
TEST METHOD
REQUIRED VALUE
Tensile Strength
ASTM D 4632
400 Newtons (901b)
Elongation
ASTM D 4632
<50% - fabric self supporting
> 50% - fabric requires woven
wire backing
Apparent Opening Size (AOS)**
ASTM D 4751
0.84 millimeter (U.S. Sieve #20)
Permitivity
ASTM D 4491
0.01 Sec:
Ultraviolet Stability (retained
strength after 500hrs of
ultraviolet exposure)
ASTM D 4355
70%
4. A 6 in. x 6 in. trench shall be dug on the upstream side of the silt fence.
The silt fence shall line the trench and extend up the posts for the remainder
of the fabric width. The trench shall then be backfilled and tamped. Silt fence
fabrics shall be spliced together only at supporting posts with a minimum of
6 in. of overlap and in such a manner to prevent silt from passing between
the two ends. At the time of installation, the fabric will be rejected if it has any
defects, deterioration, or other damage incurred during manufacture,
transportation, or storage.
Silt Fence Maintenance Considerations
1. Inspect silt fences at least once a week and after each rainfall. Make any required repairs immediately.
2. Should the fabric of a sediment fence collapse, tear, decompose or become ineffective, replace it promptly.
3. Remove the sediment deposits as necessary to provide adequate storage volume for the next rain and to
reduce pressure on the fence. Take care to avoid undermining the fence during cleanout.
4. Remove all fencing materials and unstable sediment deposits and bring the area to grade and stabilize it
after the contributing drainage area has been properly stabilized.
EXCELSIOR SPECIFICATIONS
1. The erosion control blanket (excelsior) shall consist of a
machine produced blanket of curled natural fibers. The fiber
thickness shall be consistent and evenly distributed over the
entire area of the blanket. Both sides of the blanket shall be
covered with an extra heavy-duty plastic netting with a mesh
opening of approximately 3/4 inch. by 3/4 inch.
2 Installation shall start at the furthest point downstream of
the reshaped river bank and proceed upslope with each panel
overlapping the other as per the manufacturer's specifications.
3. For each panel, start installation near the toe of each bank at
the normal river stage level and install up the bank. From the toe
to the top of the bank, one complete panel shall be installed
(no splicing is allowed).
4. The blankets shall be stapled in place as per the
manufacturer's specifications.
5. Anchor the top of each panel by burying the panel edge.
6 ENGINEERING & ENVIRONMENTAL
2C SCIENCE COMPANY
3008 Anderson Drive
Raleigh, NC 27609
[phone]
Erosion Control Details
Stream Bank Stabilization
2009 Willow Hill Lane
Clayton, NC 27520
02/17/21
DRAWN:
TPS
REVISED:
SCALE:
See Drawings
Sheet No.

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