NCC215817_Site Plan or Location Map_20211103

Location:
L E
SF SF
SF SF
LC
G E /V D
TEMPORARY DIVERSION SWALE
PER DETAIL 6.20
TEMPORARY SEDIMENT FENCE
PER DETAIL 6.62
TEMPORARY SEDIMENT FENCE OUTLET
LIMITS OF CONSTRUCTION (TYPICAL)
STABILIZED CONSTRUCTION ENTRANCE
PER DETAIL 6.06
EXISTING CONTOURS
PROPOSED CONTOURS
ROCK PIPE INLET PROTECTION
PER DETAIL 6.55
TEMP. POROUS BAFFLES
PER DETAIL 6.65
TEMP. SKIMMER
PER DETAIL 6.64
TEMP. SLOPE DRAIN
PER DETAIL ON EC-3
RIP RAP OUTFALL PROTECTION
PER DETAIL 6.41
GENERAL NOTES:
1. BOUNDARY SURVEY INFORMATION PROVIDED BY LANCE SCHAMBACK, PLS.
2. CONTRACTOR SHALL BE RESPONSIBLE FOR VERIFYING THE LOCATION OF ALL
EXISTING UTILITIES (SHOWN OR NOT SHOWN ON PLANS) PRIOR TO ANY GRADING
ACTIVITIES. ANY CONFLICTS SHALL BE BROUGHT TO THE ATTENTION OF THE
ENGINEER.
3. OFF -SITE BORROW OR WASTE SHALL COME FROM OR GO TO AN APPROVED SITE.
4. ALL EROSION CONTROL MEASURES MUST BE MAINTAINED UNTIL ALL DISTURBED
AREAS HAVE BEEN PERMANENTLY STABILIZED. ADDITIONAL MEASURES MAY BE
REQUIRED AS SITE CONDITIONS WARRANT.
5. SEE SHEETS EC-2 AND EC-3 FOR EROSION CONTROL SPECIFICATIONS AND DETAILS.
6. ALL STORM INLETS SHALL BE PROTECTED BY EXCAVATED DROP INLET PROTECTION
AS PER. DETAIL ON SHEET EC-3. SEE SHEET EC-2 FOR STORM DRAIN DATA.
7. GRADES MAY BE ADJUSTED IN THE FIELD TO OBTAIN BALANCE OF CUT AND FILL.
COORDINATE ANY CHANGES WITH ENGINEER AND SURVEYOR. ALL DRAINAGE FLOW
LINES MUST MAINTAIN A MINIMUM SLOPE OF 1%.
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THIS PLAN SHOWS A TOTAL AREA OF NO MORE THAN 7 ACRES VICINITY MAP
OF DISTURBED OF WHICH 2.2 ACRES OF DISTURBED AREA o a I V0 SCALE
SUR VE Y INFORMATION BY., a w N
(3 ACRES PAID) WAS PREVIOUSLY PERMITTED (BY GERALD GRANT, PE) Schombock Surveying, P.A.
LEAVING A TOTAL OF 4 ACRES TO BE PERMITTED AT THIS TIME. P.O. Box 4143
Mooresville, N. C. 28117
Phone: (704) 622-
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C-3218
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TEMP. ROCK WEIR SEDIMENT FENCING \ _ ' N j / / _ - - l 16 - - / a zop
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OUTLETS. INSTALL AT ALL LOW POINTS _ - - - _ \\ - � � \---------- ----- - --- /- / ��/ w
\ \ FENCING AT EVERY 100 FEET - - -� z __-, 18 E /
±14 LF 24--I SINGLE WALL HDPE FOR CLEANWATER - - - - - - - - - - - - - - _ _
\ \ \ BYPASS AROUND DISTURBED AREA. \ /I \ - _ - - - / °�2 `l9 E / // \co
PIPE T0,DISCHARGG_E-ON`870 CONTOUR AT EDGE OF \� / \ \, _ - - - - - /'' / S S g 1 �5" CPP ' / o
\ / 4 / �\ I= o> I i
\ \ \ \ \ \ \ \ \ STREAM BUFFER. o 28„E c on�re{e . X ExiSt;n9 Fen o n
\ \ 49 -_° _
\ \ \ \ \ \ \ TEMPORARY S-LQPE DRAINS FOR DIVERTING / J , %'tea 0.51 w� �\/ O� o /� z w
\ \ 3 N SEDIMENT LADEN RUNOFF -INTO REAR OF BASIN / 6 ''' %s C i
\ \ \ \ \ \ 1 \ \ a AS SHOWN. SEE DTLS. ON SHEET EC-3. - - - - - - - - 6og ` \ \ i�3g"E \ - - - >,/ g Fen°e �� x� , 1 1
\ \ \ \ \ \\ \ M N SKIMMER SEDIMENT BASIN WITH POROUS BAFFLES - - - - '' / S 8`l 90 -LsF ` �900 l I I \
\ \ \ \ PER DTLS ON PLAN SHEET EC 3. SEE SIZING ON ` - r - i F ° q"E \ 1 \
PLAN-SIEET-EC-2. 9°i6'4ax�� I
BOTTOM: 861.00 1 42 22 /- \ �� 116• I I
/ I \ TOP OF BERM: 866.0 l
/ ( \ /PROPOOED FUTU E ENTRANCE
MIN. URFACE AREA: 18 FT. c, 1
I ( NOT TO BE USED AS A a a m` °Q l I \
D INAGE A : 2.70 ACRE
CQNSTRUCTION ENTRANCE 1 Q i\ of S 3.�0/
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BUFFER�AS SHOWN. BUFFERS / tp o20 A g 9 000w/ / ago/ / / , - �� �^ \ ��\� �\ _ - - \ \ I I I I 1 I o Tj
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WITH STRA)lV'WATTLESI
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het RI / / / / ��/ /// / / I a I\ - I l / 1 / / /// / / / / / / BPFF'FR�AS SHOWN. BUFFERS \
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PUBLICATION OR REUSE OF THESE DRAWINGS OR ANY DETAILS WITHIN MUST BE WITH THE WRITTEN CONSENT OF PIEDMONT DESIGN ASSOCIATES, P.A.
Owner:
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REVISIONS
BY
Date: 8/25/20
Scale: 2'' t Contours
Drawn: DMD
Checked: DLM
Project: 2020-03-02
,lob: 2020-03-02
Sheet
EC-1
of 3 Sheets

NARRATIVE:
Amity Hill LCID, LLC is proposing an expansion of its existing facility located off Amity Hill Road and
Ostwalt Amity Road in Iredell County, North Carolina. The scope of work will involve stripping topsoil &
stockpiling, preparing subgrade, installation of a permanent creek crossing with culvert, grading and
seeding. Off site areas will be protected from sediment using temporary construction entrance,
temporary silt fencing and temporary diversions with straw wattles, clean water bypass, skimmer
sediment basins (existing & proposed). The limits of construction shall be as shown on plans. Total
disturbed area originallypermitted was 3 acres Ian b Gerald Grant). New or additional disturbed
P (P Y )
area is estimated to be no more than 4 acres. Upon completion all disturbed areas shall be
permanently stabilized with gravel and grass as per the seeding specifications.
r% r- A l r- n A I _
The work shall consist of furnishing labor and material, equipment and performing all operations
necessary for a complete installation of all work as specified herein and as shown on the drawings.
1. Work shall consist of installation of temporary erosion control measures; stripping topsoil, preparing
subgrade, relocation of excess soils located on site to adjacent site placement of stone, concrete &
asphalt; redistribution of topsoil strippings, and permanent seeding. All disturbed areas shall be left
in a stabilized condition upon completion of this project.
2. The Contractor is expected to examine the site to familiarize himself with site conditions. The
Contractor shall carefully read all the specifications and examine the drawings and details in order to
thoroughly familiarize himself with the work to be done. Any work shown on the drawings or included
in the specifications, or reasonably implied by either, shall be performed the some as if called for by
both.
EARTHWORK:
1. A temporary bench mark shall be established on site.
2. The Contractor shall be thoroughly familiar with the Erosion Control Sequence as stated hereafter
and shall follow this sequence to insure that no off site pollution occurs during or after construction.
Any deviation from this stated sequence or plans and details shall have prior approval of the
Owner's Engineer and Iredell County Erosion Control Office.
3. Top Soil: Strip all top soil from the area to be graded and stockpile on site for redistribution
upon completion of grading.
4. If required, soil borings shall be taken in the area of the building pads by a certified soils engineer
and the results reported to the Owner's Engineer. This work shall be done if directed by the Owner's
Engineer.
5. Fill Dirt shall be placed in the areas indicated on the plan. Fill material shall be free of brush,
rubbish, and other material that will be detrimental to construction of a stable fill. All fill shall be
compacted to a minimum of 95% Standard Proctor with proper moisture control. Maximum thickness
of layers of fill to be compacted shall not exceed 8". No slopes shall be steeper than 2: 1. The
entire sub -grade after compaction shall be smooth and uniform slope.
6. Subgrade and fill to be verified and tested by geotechnical engineer.
7. Cut Material to be excavated is assumed to be earth and other materials that can be removed by
power -shovel, bulldozer, motorized pan, or normal excavating equipment; but not requiring the use
of explosives or drills. If rock (as defined herein) is encountered within the limits of excavation, the
Contract Sum will be adjusted in compliance with provisions for "Changes in the Work" of the
"Conditions of the Contract". When rock is encountered, Contractor shall notify the Engineer
immediately; and shall not proceed further until instructions are given and measurements made for
the purpose of establishing volume of rock and the value of excavating some. Rock is defined hereby
as that material which cannot be ripped by a crawl er-tractorrated at a minimum of 50,000 lbs.
drawbar pull at one mile per hour, pulling a single -tooth ripper. Equipment shall be in good repair,
and shall be in proper working condition.
Rock is further defined hereby as boulders larger than
1 /2 cubic yard in size.
No payment will be
made on the basis of unit -price for rock unless minimum
-sized equipment or
better is utilized as
required hereinbefore. Rock work is defined hereby as
removal of material by
drilling, blasting or
wedging. Rock shall be stripped for measurement before
excavating, and no
rock excavated or
loosened before measurement will be allowed or paid
for as rock. Measurement
and payment,
therefore, shall be by number of cubic yards required to
bring the excavation to
the required surface
or grade as required by the Contract Documents. The Owner may adjust the grades should excessive
rock be encountered.
EROSION CONTROL SPECIFICATIONS
Requirements of the Contract Documents apply to all work
in this section.
GENERAL: Provide the work of this section for erosion
and sediment control
as indicated and
specified as follows:
Construction entrance; hardware cloth & gravel inlet protection, temporary sediment fencing,
diversion swales, temporary diversions, straw wattles, skimmer sediment basin and permanent
seeding.
CONTRACTOR'S RESPONSIBILITY: The
Contractor shall furnish the
Owner a system of temporary
controls
to minimize soil sediment
erosion during the construction
period caused by storm water
runoff.
Work shall be performed as
called for on the drawings and
as site conditions warrant. All
erosion
control measures shall be
constructed in accordance with
the NC Erosion and Sediment
Control
Planning and Design Manual Latest Edition.
OWNER'S RESPONSIBILITY: After the acceptance, it is the Owner's responsibility to properly maintain
the work.
EROSION AND SEDIMENT CONTROL: The Contractor shall provide erosion and sediment control during
the period of construction of this project. The Contractor shall protect and maintain the temporary
erosion and sediment control structures which provide temporary sediment pollution control, as shown
on the drawings. The Contractor shall protect and maintain the temporary facilities as necessary to
trap soil erosion and sediment pollution created by storm water runoff. Maintenance of these facilities
shall include, but not be limited to, regrading and filling of washed out areas, adding erosion control
blankets, adding silt fence, adding additional wattles and reseeding and mulching of the swales during
the construction period if deemed necessary by the Owner, Owner's Engineer, or the Iredell County
Erosion Control Office.
EROSION CONTROL SEQUENCE:
The following sequence of construction shall be staged as required to provide acceptable erosion and
sediment control.
1. Contractor shall arrange a pre -construction meeting with the Owner, the Owner's Engineer, and a
representative from the Iredell County Erosion Control Office prior to any land disturbing activity. An
Erosion Control Plan Approval Certificate shall be displayed and a copy of the approved erosion
control plan must be available on site at all times during construction. Contractor shall install all
erosion control measures.
2. Barricade off construction area. Construct access drive which shall receive a minimum of 6" depth
of 2"-3" coarse aggregate in loose measurement at locations shown on the plan. Any sediment
accumulation on adjacent public roads or areas not within limits of construction as a result of
this project and traffic from this project shall be immediately cleaned off by the Contractor.
(Minimum Stabilized Construction Entrance Length = 100' as per detail 6.06.)
3. Install construction entrance, sediment fencing along with rock weir outlets, temporary diversions
with straw wattles as shown on plan sheet EC-1. Any diversion swales with anticipated velocities of
greater than 2 ft./sec. shall be matted.
*No Drefabricated silt fence is to be used on this Droiect.*
4. Once all measures are in place, a site inspection by Iredell County Erosion Control Office shall
be administered prior to any earth moving activities.
Strip topsoil and stockpile in areas as shown on the plans.
NOTE: No offsite work shall take place offsite until approval from property owner is in place.
5. Rough grade site as shown by proposed contours. Stabilize disturbed areas as the site is brought
to grade. The angle for graded slopes and fills shall be no greater than the angle that can be
retained by vegetative cover or other adequate erosion control devices or structures. In any
event, slopes left exposed will, within 14 calendar days of completion of any phase of grading, be
planted or otherwise provided with temporary or permanent ground cover, sufficient to restrain
erosion. The angle for graded slopes and fills must be demonstrated to be stable. Stable is the
condition where the soil remains in its original configuration, with or without mechanical
restraints. Additional measures to control and sediment may be required by Iredell County Erosion
Control Office.
6. Contractor to get roadway to final grade so that gravel base can be installed. Site shall be
seeded within 7 days of being brought to grade.
7. The Contractor shall sow groundcover (including fertilizer and mulch) on all exposed earth areas
within 14 calendar days following completion of any phase of grading; sow permanent groundcover
for all disturbed areas within 14 calendar days following completion of construction or
development. Contractor shall inspect seeded areas at 14 days after initial seeding and repair all
bare areas. Non -stabilized areas shall be stabilized with erosion control blankets or other
acceptable methods as approved by the Engineer. (See Stabilization time frame table this sheet).
8. The Contractor shall be responsible for maintaining all sediment and erosion control measures
throughout the duration of the construction project. Maintenance shall include, but not be limited
to: cleaning silt out of drain structures, adding extra gravel or riprap; regrading berms/swales
and washed out areas; repairing, replacing, or adding silt fence, etc., all as required.
9. Contractor shall clean all all impacted storm drainage structures, flumes, pipes, culverts, etc.
prior to final payment. Contractor to clean affected pavement areas daily. Contractor shall
communicate directly with the Owner or the Owner's representative to coordinate the relocation of
automobiles to prevent damage directly or indirectly as a result of these site improvements.
10. At the end of the project construction and after permanent ground cover is established, the
Contractor shall request an inspection from Iredell County Erosion Control Inspector prior to
receiving permission to remove all temporary erosion control structures grading these areas as
shown by the proposed contours on Sheet EC-1 and seed all remaining disturbed areas, including
any areas of poor quality vegetation.
12. Contractor shall "hold the Owner harmless" from financial penalty, which could be invoked by
government authority, due to Contractor's negligence.
13. Contractor is responsible for performing self -inspections and reporting in accordance with NCDENR
DWQ General Permit NCG 010000 Section 11.13, paragraph 3.
SEEDING SPECIFICATIONS:
SLOPES 3:1 or FLATTER
1. Apply agricultural lime at the rate of 90 Ib/1000 sf.
2. Apply 10-10-10 commercial fertilizer at the rate of 20 Ib/1000 sf.
3. Seed in accordance with the following schedule and application rate:
DATE TYPE PLANTING RATE
Aug 15 - Nov 1
Nov 1 - Mar 1*
Mar 1 - Apr 15
Apr 15 - Jul 30
Tall Fescue
Tall Fescue and
Abruzzi Rye
Tall Fescue
Hulled Common or Bermuda
200 Ib/ac or 7 Ib/1000 sf
200 Ib/ac or 7 Ib/1000 sf
25 Ib/ac or 1 /2 Ib/1000 sf
200 Ib/ac or 7 Ib/1000 sf
30 Ib/ac or 1 Ib/1000 sf
Jul 15 - Aug 15 Tall Fescue and 200 Ib/ac or 7 Ib/1000 sf
Brown Millet or 35 Ib/ac or 7/8 Ib/1000 sf
Sorghum -Sudan Hybrids 30 Ib/ac or 3/4 Ib/1000 sf
* Heavily mulched during January - March period. Coat applied at the rate of 5-7 gal/1000 sf
or 200-300 gal/ac.
4. Mulch with straw applied at the rate of 75-100 Ib/1000 sf. and anchor with asphalt emulsion
tack coat applied at the rate of 5-7 gal/1000 sf or 200-300 gal/cc.
SLOPES GREATER THAN 3:1 TO 2:1
1. Apply agricultural lime at the rate of 90 Ib/1000 sf.
2. Apply 10-10-10 commercial fertilizer at the rate of 20 Ib/1000 sf.
3. Seed in accordance with the following schedule and application rate.
DATE TYPE PLANTING RATE
Mar 1 - Jun 1 Sericea Lespediza (scarified) &
Mar - Apr Add Tall Fescue or
Jun - Sep 1** German Millet or
Small -Stemmed Sudan Grass
Sep - Mar 1 Sericea Lespediza
(unhulled-unscarified)
Tall Fescue
Millet or Sudan
50 Ib/ac or 11 Ib/1000 sf
150 Ib/ac or 3-1/2 Ib/1000 sf
40 Ib/ac or 1 Ib/1000 sf
50 Ib/ac or 1.2 Ib/1000 sf
70 Ib/ac or 1-3/4 Ib/1000 sf
150 Ib/ac or 3-1/2 Ib/1000 sf
20 Ib/ac or 1 /2 Ib/1000 sf
** Temporary - Reseed September 1 at recommended rates.
4. Mulch with 3" straw applied at the rate of 50-90 Ib/1000 sf and anchor with asphalt
emulsion tack coat applied at the rate of 5-7 gal/1000 sf or 200-300 gal/ac.
NEW STABILIZATION TIMEFRAMES
Site Area Description
Stabilization
Timeframe Exceptions
❑ Perimeter dikes, swales, ditches and slopes
7 days
None
High Quality Water (HQW) Zones
7 days
None
Slopes steeper than 3:1
7 days
If slopes are 1 D' or less in length and are not
steeper than 2:1; 14 days are allowed.
0 Slopes 3:1 or flatter
14 days
7 days for slopes greater than 50' in length.
ry All other areas with slopes flatter than 4:1
14 days
None, except for perimeters and HQW Zones.
TEI.'F c I•.II.'I.'E=
SE DIME14T DRAIN. CENU DEO RAIN. REQ MIN. REG.
c EC II.'E'•<T
SEC.
E S IN
SED.
'-'ilTH B,-,F FLES DATA
SED. WEIR SKIMMER
STORAGE
STORAGE
STORAGE
WEIR
FL13N
TOP
TOP
8OT.
Bi1T.
8OT.
SIZE
SKIMMER
BASIN
AREA
AREA
STORAGE
Q
SURF. AR EA
CEPTH
WICTH
LENGTH
LEN13TH
CEPTH
'WIDTH
LEI GTH
WIC TH
LEN13TH
BASIN
IINI
ORIFICE
NUMBER_
ACRES
ACRES)
(C9
C FS
ISH
JFT
FT[FT
FT'
IFTI
JIFT
FT
FT[FT'
ELEV.
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DIA. IN
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Design Requirements: Freeboerd 200 Fed
101'r Storm Inhans itv d95 i nr17 C= 0. 3
ALL TEMN)RARY 5Kh&ER SEDIMEW BA51N5 TO DE CONSTRUC TED AS PER DETAIL$.64
OVERLAP
4 C/C
(1' Min.)-ROCK
WEIR OUTLET. SUBSTITUTE
HARDWARE CLOTH WITH #5 WASHED
STONE ON UPSLOPE SIDE AT LOW
POINTS ALONG SEDIMENT FENCING. 6
WOVEN FILTER FABRIC
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MAINTENANCE NOTES:
1. ROCK WEIRS SHALL BE INSPECTED IMMEDIATELY AFTER
EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY
REPAIRS NEEDED SHALL BE MADE IMMEDIATELY.
2. SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH STORM EVENT. THEY
MUST BE REMOVED WHEN DEPOSITS REACH APPROX. HALF THE HEIGHT OF THE
WEIR. ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE ROCK WEIR
IS REMOVED SHALL BE DRESSED TO CONFORM TO THE EXISTING GRADE,
PREPARED AND SEEDED
Location: PUBLICATION OR REUSE OF THESE DRAWINGS OR ANY DETAILS WITHIN MUST BE WITH THE WRITTEN CONSENT OF PIEDMONT DESIGN ASSOCIATES, P.A.
Owner:
STEEL POST
OVERLAP
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HARDWARE CLOTH SHOULD
TIE
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IT IS NOT NECESSARY TO
INCLUDE STONE DOWNSTREAM
OF
THE HARDWARE CLOTH
Approved:
3' MIN.
UPSTREAM SIDE
HARDWARE CLOTH
#5 WASHED STONE ON
UPSLOPE SIDE OF WEIR
SKIRT 6° MINIMUM
Date of Issue:
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REVISIONS
BY
Date: 8/25/20
Scale: N/A1
Hor
Drawn: DMD
Checked: DLM
Project:
Job:
Sheet
EC-2
of 3
Sheets

2.3 ' >,R. r
coarse aggregate �C`
Figure 6. Dam Gravel entrancelexit keeps sadmenl from leaving the conslructlori Mile (modified tram Va Swo C).
Construction I. Clear the entrance and exit area of all vegetation. roots, and other
Specifications objectionable material and properly grade it.
2. Place the gravel to the specific grade and dimensions shown on the plans,
and smooth it.
3. Provide drainage to carry walcr to a sediment trap or other suitable
outlet.
4. Use gcotextile fabrics because they improve stability of the Foundation in
locations subject to seepage or high water table.
Maintenance Maintain the gravel pad in a condition to prevent mud or sediment from
leaving the construction site. This may require periodic topdressing with 2-
inch stone. After each rainfall, inspect any stmcture used to trap sediment
and clean it out as necessary. Immediately remove all objectionable materials
spilled, washed, or tracked onto public roadways.
6.41
Nd
Pipe outlet to Flat Area -
No Well-defined Channel
1 3do A
Plan .w
teAWW"TIF711
blartket
Pipe Outlet to Well-defined
Channel
Motes
1. La is the length of the riprap
apron.
2. d =1.5 times the maximum
stone diameter but not less
than 6"-
3. In a well-defined channel ex•
tend the apron up the channel
banks to an elevation of 6"
above the maximum taIlwatat
depth or to the top of the bank,
whichever is less.
4. A filter blanket or filter fabric
should be installed between
the riprap and soil foundation.
La �
_ e I d
_ 1
III iI lit I)li Section AA - r - .I{elrW Y
Filter
blanket
Figure 6.41c Rtprap et ecapn modllad from Va EWCCI .
Construction t- [--naive that the subgrade far the filter and riprap follows the required lines
Specifications and grades shown in the plan. Compact any fill required in the subgrade to the
p density ofthe surrounding undisturbed material- I -ow areas in the subgrade on
undisturbed sole may also be filled by increasing the riprap thickness.
2. The riprap and gravel filter must conform to the specified grading limits
shown on the plans.
3. Filter cloth, when used, must meet design requirements and be properly
protected From punching or tearing during installation. Repair any damage by
removing the riprap and placing another piece of fiber cloth over the damaged
area. All connecting joinu should overlap so the top laver is above the
downstream laver a minimum of 1 foot. If the damage is extensive, replace
the entire filter cloth.
4. Riprap may be placed by equipment, but take care to avoid damaging the
filer.
5. The minimum lhicknds of the riprap should be 1.5 times the maximum
stunt diamcicr.
& Riprap may W field stone or rough quarry stone. It should be hard,
angular. highly wcatrer-resislum and well graded.
7. Construct the aprm, on rrrn grade with min overfill al the end. Make the
lop ofthe riprap at the downstream end level with the receiving area or slightly
below• it.
a. Ensure that the apron h properly aligned with the receiving stream
and preferably straight throughout its length- If a curve is needed to fit site
conditions. place it in the upper section of the apron.
9. 1 mmed iately after construction, stabi Eize at I disturbedareas with vegetation
(Practices 6.10, Temporary Seeding, and 6.11. Permanent Seeding).
Maintenance Inspect riprapotaletstroctures weekly and after%ignificarl (V2 inch or greater)
raintatl events to see ifany erasion around or below the riprap has taken place,
or if stones have been dislodged. Immediate make all needed re trs W
Y Fro
prevent further damage.
6.20
6.62
SEDIMENT FENCE
Construction MATERIALS
Specifications 1. Use a synthetic filter fabric arid least 95% by weight of pcilyclefins or
polyester, which is certified by the manufacturer or supplier as conforming to
the requirements in ASTM D 6461. which is shown in part in Table 6.62b.
Synthetic filter fabric should contain ultraviolet ray inhibitors and stabilizers
to provide a minimum of 6 months of expected usable construction life at a
temperature range of O to 120' F.
2. Ensure that posts tar sediment fences are 1.33 lb/linear It steel with
a minimum length of 5 feet. Make sure that steel posts have projections to
facilitate fastening the fabric.
3. For Teinfarcememt of standard strength filter fabric, use wire Fence with a
minimum 14 gauge and a maximum mesh spacing of 6 inches.
Table 6.62h Sner-ifir-atinnc For Sediment Fenr-e Fabric
Temporary Silt Fence Material Property Requirements
supported'
Uri -Supported'
Type of
Test Material Units Silt Fence
Silt Fence
Value
Grab Strength ASTM D 4632 N (Ibs)
Machine Direction 400
550
MARV
(90)
(90)
x-Machine Direction 40D
460
MARV
(90)
(90)
Permittivity ASTM D4491 gec-1 0.05
0.05
MARV
Apparent opening Size" ASTM D 4751 mint 0.60
0.60
Max. ARVI
(US Sieve k) (30)
(30)
% 70%after
Ultraviolet Stability ASTM D 4355 Retained Stab of exposure
70%after
5oDh of exposure
Types
Strength
' Sill Fence support shall consist of 14 gage steet wire wrth a mesh spacing of I50 mm (6 Inches), or prefabricated poyrmer mesh of
equivalent strength
`These default values are based on empirical evidence wain a variety of sediment. For environmentally
sensitive areas, a review of
previous experience andlor sire of regionally specific geotexlile teals In accordance with Test Method D 5141 should be performed
by line agency to coFArm suitability of Ihese requirements.
' As measured In accordance with Test Method D 4632.
CONSTRUCTION
I. Construct the sediment harrier of standard strength or extra strength
synthetic filter fabrics.
2. Ensure that the height ofthe sediment fence does not exceed 24 inches
above the ground surface. (Higher fences may impound volumes (if water
sufficient to cause failure ofthe structure.)
3. Construct the filter fabric from a continuous roll cut to the length ofthe
barrier to avoid joints. When joints are necessary, securely fasten the filter
cloth only at a support post with 4 feet minimum overlap to the next post.
4. Support standard strength filter fabric by wire mesh fastened securely to
the upslope side of the posts. Extend the wire mesh support to the bottom of
the trench. Fasten the wire reinforcement, then fabric on the upslope side of
the fence putt. Wire or plastic zip ties should have minimum 50 pound tensile
strength.
5. When a wire mesh support fence is used, space posts a maximum of 8 feet
apart. Support posts should be driven securely into the ground a minimum of
24 inches,
6. Extra strength filter fabric with 6 feet post spacing does not require wire
mesh sup" fence. Securely fasten the filter fabric directly to posts. Wire or
plastic zip ties should have minimum 50 pound tensile strength.
Cross -Section
View
._:.........
............ t.pe
....V. "
Filter
steel sic aeckfill trweh N�.o„fu��f�nl
.. ...
.1.4....
... - . "n - . .. T utall�
- - ..
'... . . . ..
post and Compass �d
- - - I - ...
}horoughly
. . .. " Is.
24'.. . m n
1
n Plgure 8.67a 1 sta lahbn detail Of a setivnam Mnba
The Slicing Method
1-r" Posr S :INQ.
. 246ripen n,,,
n,m . on Poblng -
w .h w
� .m d aov
PLOW
_y�y� POST DIM-
.=
ere�r
w mnp.ara m
No more than 24" of a 36" fabric
is allowed above ground.
A
w
................. ................wu,W-
a� I s
�h
Li
AFrACHMEW 1 e 11
. seerer roblc a co.w r reedeel.
. allitre three lee ar In a' or t�rk:.
per pm. fop
•fk.Ibn each eedaper vet, p� sin helea lCdllr
mnmem ar ropori.
. Haig ep hIt. ma pear rV%dF and*,!A-N .Wy.
Use cable Ass C501ba or soli Wre.
Roll of slit fence
51tIMMER SEDIMENT BASIN BAFFLES gum TEMPORARY SLOPE DRAINS
Arm Assembly
(T \ Znkl*�).._ 'C' Enclosure
21
PERSPECTIVE VIEW Watunit
PVC End PVC vent PVC Elbow pi Schedule 40
e
Cop � / P -_ / PVC Pipe
PVC End
7 Cap
Schedule 40
PVC Teerf�%P�'.�
e PVC pipe
in -A PVC Tee Orifice
de Flexible Plate
Haft
. 0
END VIEW FRONT VIEW
Figure 6.64a Schematic of a skimmer, from Pennsylvania Erosion and Sediment Poll utlon Control Manual,
March, 2000.
Plan View
Inflow
structure
----�
Emergency
spillway
Average - Area' `1►
Width W ` L
e Are of husin water surface Err
top of principal spillway elevation
Baffles
.1 - er.,hn..Lr.,en+
�,W rmem Cross -Section
storage zone
View
Figure6.64a Example of a sediment basin with a skimmer outlet and emergency spillway. From Pennsylvania
Erosion and Sediment Pollution Control Manual, March, ZU00.
Construction L. Clear, grub, and strip the area under the embankment of all vegetation and
5 ecificats root mat. Remove all surface soil containing high amounts of organic matter
p and stockpile or dispose of it properly. Haul all objectionable material to the
designated disposal area. Place temporary sediment control measures below
basin as needed
2. Ensure that till material for the embankment is free of mots, woody
vegetation. organic matter, and other objectionable material. Place the fill in
lifts not to exceed 9 inches, and machine compact it. Overfill the embankment
6 inches to allow for sa-tilemcnl.
3. Shape the basin to the specified dimensions. Prevent the skimming device
from settling into the mud by excavating a shallow pit under the skimmer or
providing a low support under the skimmer of stone or timber.
4. Place the barrel (typically 4-inch Schedule 40 PVC pipe) on a firm, smooth
foundation of impervious soil. Do not use pervious material such as sand,
gravel, or crushed stone as backfll around the pipe. Place the fill material
around the pipe spillway in 4-inch layers and compact it under and around
the pipe to at least the same density as the adjacent embankment. Care must
be taken not to raise the pipe from the firm contact with its foundation whim
compacting under the pipe haunches.
Place a minimum depth of 2 feet of compacted backh[1 over the pipe spillway
before crossingit with constructionequipment. n c case should the i i t i n pipe
conduit be installed by cutting a trench through the dam after the embankment
is complete.
5. Assemble the skimmer following the manufacturers instructions, or as
designed.
6. Lay the assembled skimmer on the bottom of the basin with the flexible
joint at the inlet of the barrel i . Attach the flexible joint to the barrel i
J p pe ) pipe
and position the skimmer over the excavated pit or support. Be sure to attach
n w a rape t the skimmer and anchor rt to the side of the basin. This dl be used
to pull the skimmer to the side for maintenance.
7. Earthen spillways -Install the spillway in undisturbed soil to the greatest
extent possible. The achievement of planned elevations, grade, design width,
and entrance and exit channel slopes are critical to the successful operation
of the spillway. The spillway should be lined with laminated plastic or
impermeable geotextiie fabric. The fabric must be wide and long enough to
cover the bottom and sides and extend onto the top of the dam for anchoring
in a trench. The edges may be secured with 8-inch staples or pins. The fabric
must be long enough to extend dawn the slope and exit onto stable ground.
The width of the fabric must be one piece, not joined a spliced; otherwise
water can get under the fabric. if the length ofthe fabric is insufficient for the
entire length ofthe spillway. multiple sections, spanning the complete width,
may be used. The upper section(s) should overlap the lower section(s) so
that water cannot flow under the fabric. Secure the upper edge and sides
of the Fabric in a trench with staples or pins, (Adapted from ''A Manual for
Designing. Installing and Mairim Ining Skitnmer Sediment Basins." February,
1999. J. W. Faircloth & San.).
8. Inlets -Discharge water into the basin in a manner to prevent erosion. Use
temporary slope drains or diversions with outlet protection to divert sediment -
laden water to the upper end of the pool area to improve basin trap efficiency
References: Runs Cmmol Merrsrems and Ouder Prolecriom .
[ ,O- r
9. Erosion control -Contract the structure so that the disturbed area is
minimized. Divert surface water away from bare areas. Complete the
embankment before the area is cleared. Stabilize the emergency spillway
embankment and all other disturbed areas above the crest of the principal
Figure 6,85a Porous baffles in a sediment basin. The Row is distributed evenly across the basin to reduce
flow rates and lurhuienee, resulting in greater sediment ratentlon.
Baffles need to be installed correctly in order Fully provide their benefils.
Refer to Figure 6.65b add the following key points:
• The bailie makrial needs to be secured at the bottom and sides using
staples or by trenching as for silt fence.
• Most ofthe sediment will accumulate in the first bay- so this should be
readily accessible For maintenance.
Support rope. Suipliort post,
mnit sugging or side wire
�1Si■l r__ ___ _mot■ tip ■iltE ___
■fill■ ■i■■�■■i■ ii�f■iiiit" i'
Ei■i■tit ■l■ ■Ei■ E■ii ■ii
�i■ ■i■■E■■■Ei■ fiE■ ■i_
�i■ ■[I■ ■i■ ■i■ iii ■W
Figure 6.65b Cross-section of a porous bailie in a sediment basin. Note that Irm ie no weir because the water
flours through the baffle material
Flgy TiA.Sp E><a %of porous Deeds using sarMnca v h srna win In e- h alrernauN apeceor wke le king fence. (Cliynr Hlgh Pohl, He
Construction I . GMdc the basin so that the bottom is Ievel front to hack and side to side
Specification 2• Install posts or saw horses across the width of the sediment trap IPractice
6-6?, Sedira w Fence).
3. Steel posts should be driven to a depth of24 inches. spaced a maximum
of 4 Feet apar4 and installed up the sides of the basin as well. The top of the
fabric should be 6 inches higher than the invert ofthe spillway. Tops ofbafRes
should he 2 inches Io vcr than the top of -the berms.
4. install at least three lows of baffles belween the inlet and outlet discharge
poinr, Basins less than 7-01'eeI in length may use 2 baffles-
5. When using pcsK add a suppuri wire or rope across the leg• of the measure
to prevent sagging.
6, wrap pours malerial, Iikejute backed try cPir material, over a sawhorse or
the rap wire. Ranhmer rebar into the sawhorse legs For anchoring. The fabric
should have five to ten percent opcningm in the weave. Attach fabric to a rope
and a support so-DCWre Wilk Zip IieB. wire, ur staples.
7. The bottom and sides of the fabric should be anchored in a trench or pinned
with a -inch erosion cautrol malting staples.
t6 Do not splice the lebric, huh use a continuous piece across the basin.
Maintenance Inspect battles al least once a week and after each rainfall. Make any required
repairs immediately.
Be sure to maintain access to the baffles. Should the fabric ofa baffle col lapse,
.
War, decompose, or become inenective, replace it promptly.
Remove sediment deposits when it reaches half full to provide adequate
sumgc volume for the next rain and to redLvx pressure on the baffles. Take
careto Ovoid damaging the baffles during cleanoutSediment depth should never exceed half the designed storage depth.
After the contributing drainage area has been pmperly stabilized. remove all
baffle materials and unstable sediment deposits, bring rite area to trade, and
stabilize it.
Definition A flexible tubing or conduft extending temporarily from the top to the bottom
Ora cut or fill slope.
Purpose To convey concentrated runoff down the face of it cut or fill slope without
causing erosion.
Conditions Where This practice applies to construction areas where stormwater runoff above a
cut or Oil slope will cause erosion if allowed to flow over the slope. Temporary
Practice Applies slope drains are generally used in conjunction with diversions to convey runoff
down a slope until permanent water disposal tnCaS m can be installed.
Planning There is often a significant lag between the time a out or fill slope is graded
and the time it is permanently stabilized. During this period, the slope is very
Considerations vulnerable 10 erosion, and temporary slope drains together with lemponry
diversions can provide valuable protection (Practice 6.20, Temporary
Dimrs'ions).
It is very important that these temporary structures be sized, installed, and
maintained properly because their failure will usually result in severe erosion
of the slope. The entrance section to the drain should be well entrenched
and stable so that surface water can enter freely. The drain should extend
downslope beyond the toe of the slope to a stable area or appropriately
stabilized outlet.
Other points of concerti are failure from overtopping from inadequate pipe
inlet capacity and lack of maintenance ofdivetsion chartnel capacity and ridge
height.
❑esign Criteria Cap1cilh'--Pcaknutafffrom ther Iayearstorm.
Pipe size -Unless they are individually designed, size drains according to
Table 6.32a.
Table 6.32a
Size of Slope Drain
Maximum Drainage Pipe Diameter
Area per Pipe (acres) (inches)
D. 50 12
0.75 15
1.00 18
>1.00' as designed
'inlet design becomes more complex beyond this size. -
Conduit --Construct the slope drain from heavy-duty, flexible materials such
as nonperforated, corrugated plastic pipe or specially designed flexible tubing
(Figure 6.32a). Install reinforced, hold-down grommets or stakes to anchor
the conduit at intervals not to exceed 10 R with the outlet end sccmcly fastened
in place. The conduit must extend beyond the toe of the slope -
Diversion 4
�t... min � Island over inlet
Dike%s,., A
Hold dawn stak_ee `'=; ',,1--.i ;:e -1 IMM1.5ETR
min
t x�•;::
t5 lkn
r
III-�=I�i
10' spa2J,",
- Hitfill
}� li III -I
Inlet {11-f1 '111=
--
'
I (111- I f�- ;,---11Tf
r enm
=='1Ir
Plastic
�h• ~--
11
corrugated
pipe
•: f
1i
�_
I I Top of
�.1 .
I
Stabilize 9k .; ::- :
m osland)
f I Tipd 4•�y �
outlet+ 9 -
t7 I
;f .
I dtvlydm�
y r. r" 1XV rrkt
=
Natural - ?'l.5'rain ,. , I., 31
ground 1' min
y ,"
III R `a II it
'--
s 4 ' min ,.1
9iversion -" '_ _ - � -•"I'
ct air '
-.10
level section
- - - - � - - - - -- -
Figure a.a 2a Cross section of Campo vary slope drd In.
Entrance -Construct the entrance to the slope drat¢ of a slandarxl Hared -end
section of pipe with a minimum 6-inch metal toe plate (Figure 6.32a). Make
all fittings watertight. A standard T-section fitting may also be used at the
inlet.
Temporary diversion -Generally, use an earthen diversion with a dike ridge
to direct surface runoff into the temporary slope drain. Make the height of the
drain conduit minim f t higher
edge over the andue a urn o 1 5 fixt and a feast 6 mches g
than the adjoining ridge on either side. The lowest point ofthe diversion ridge
should he a minimum of 1 foot above the top of the drain so that design flow
can freely eater the pipe.
Outlet protection -Protect the outlet of the slope dink from erosion (Practice
6.41, Outlet Stabilization Sirrictmr).
Construction
A common failure of slope drains is caused h water saturating the soil and
� y g
Specifications
seepingaloo the pipe. This creates voids from consolidation and Tin and
g p P piping g
causes washouts. Proper backHl(ing around and under the pipe "haunches"
with stable soil material and hand compacting in 6-inch lifts to achieve firm
contact between the pipe and the soil. at all points will eliminate this type of
failure,
1. Place slope drains on undisturbed soil or well compacted fill at locations
and elevations shown on the plan.
2. Slightly slope the section of pipe under the dike toward its outlet.
3. Hand tamp the soil under and around the entrance section in lifts not to
exceed 4 in6cs,
4. Ensure that fill over the drain at the topoftfre slope has minimum dimensions
of 1,5 feet depth, 4 feet top width, and 3 : I side slopes.
S. Ensure that all ,slope citin connections are watertight.
6. Ensure that all fill material is well -compacted. Securely fasten the exposed
section of the drain with grommets or stakes spaced no more than 10 feet
apart.
7. Extend the drain beyond the tee of the slope. and adequately protect the
outlet from erosion.
8. Make the Bottled, compacted dike ridge no less than I feet above the top of
The Pe at every int.
P ry Po
9. Immediately stabilize ail disturbod areas following construction.
Maintenance
Inspect the slope drain and supporting diversion after every rainfall, and
promptly make necessary repairs. When the protected area has becn
TD TEMPORARY DIVERSIONS
In�siarad
spillway immediately after construction (References: Surface Slabilimliox).
permanently stabilized, temporary measures may be removed, materials
aaer
ccmpoutlo t
I0. Install porous baffles as specified in Practice 6.65, Pnrovs Baffles.
disposed of properly, and all disturbed areas stabilized appropriately.
Compacted suit 2'
Fabric
orre
] me n v
11 After a I the sedlm t producing area have been permanently stablltaed,
1+ min .
gars Si fence
remove the structure and all tlhe unstable sediment. Smooth the area to
References Runo CotTrml Measures
FIG'
blend with the adjoining areas and stabilize properly (References: Srerfum
6.20, Temporary Diversions
_ _. 1 e" ram
t '''
4r
q•
t
:':��a �< -
Stabilizorion).
.11 11l_ f i ifI �� !I i
$
- s a�
! "
®
!a q u...12
11
O+rtlef Protection
1l 11 -
I � IiI 1 it i-f
il�llll - �*� r04`
�. ` i
6.a1, antler Stabilization Structure
6' typical -
,tea ova ':.: ..
Maintenance inspect skimmer sediment bashns at (cast wcrkEy and after each significant
13.:'-::
(one-half inch or greater) rainfall evcm and repair immediately. Remove
Flq... 6.2oa Temarraev eanhert &­ on dike
Hordalfd crawl posit 55cang block;
sediment and restore the basin to its original dimensions when sediment
I a-x.drh 1 l c.r wkin i Conwietad Ir.talbnon
accumulates to one-half the height of the first baffle. Pull the skimmer to
Coarse aggregate
Vibrolory plow is not acceptable because of horizontal compaction
one side so that the sediment underneath it can be excavated. Excavate the
3A max
sediment from the entire basin. not just around the skimmer or the first cell.
Flgur. a.62h m Scheatics for using met the slicing hod to install a sedime.Stu nt fence Adepled from Fence rear (loofas
Make sure vegetation growing in the bottom of the basin does not hold down
la" min plow
7. Excavate a trench approximately 4 inches wide and 8 inches deep along
the skimmer.
Y I
T J - --- = -
the proposed line of posts and ups lope from the barrier ( Figure 6.62a).
Repair the battles if they are damaged- Re -anchor the baffles if water is
I I - E I= m - I I i 1= - =!i
& Place 12 inches ofthe fabric along the bottom and side ofthe trench,
flowing underneath or around them.
n„ f 8' typical r�.'j
lgr
lIg I -
9. Backtill the trench with soil placed over the filter fabric and compact.
IFthe skimmer is clogged with trash and there is water in the basin, usually
Thorough compaction of the backfill is critical to silt fence performance.
jerking on the rope will make the skimmer bob up and down and dislodge
Figure G10b Temporay gravel duersion dike l-ehi.W cmasing lnhaarred from V. awed.
the debris and restore flow. If this does not work, pull the skimmer over to
10. Do not attach filter fabric to existing Trees.
the side of the basin and remove the debris. Also check the orifice inside the
Construction T. Remove amd Fmprrly dispose of all ies, brush ,wraps, and other
skimmer to see if it is clogged; if so remove the debris,
abjeutionable maeennl.
Sperafications
SEDIMENT FENCE INSTALLATION USING THE SLICING METHOD
Instead of excavating a trench, placing fabric and then backfilling trench,
If the skimmer arm or barrel pipe is clogged, the orifice can be removed and
2. e that the minimum caruu,rrerd crises section meets all design
sediment fence may be installed using specially designed equipment that
the ohstruchon cleared with a plumber's snake orby flushing with water- Be
requirements.
quuiremirements.
inscrls the fabric into a cut sliced in the ground with a disc (Figure 6.62b).
sure and replace the orifice before repositioning the skimmet.
A Ensure that the lop of the dike is rot lower at any point than the design
eir,•ation plus the specified srulement.
Check the fabric lined spillway for damage and make any required repairs
Installation I. The base of both end posts should be at least one foot higher than the
with fabric that spans the full width orthe spillway. Check the embankment,
4. Provide sufficient mom around diversions eu permit machine tvgn ding and
cleanoul.
middle of the fence. Chuck with a level if necessary.
Specifications
spillways. and outlet for erosion damage, and inspect the embankment for
2. Install posts 4 feet apart in critical areas and 6 feet apart on standard
piping and settlement. Make all necessary repairs immediately. Remove all
5. Vegetate the ridge immediately oiler construction, unless it will remain in
applications,
trash and other debris from the sk immcr and pool areas.
place less than ail working days.
3. Install posts 2 feet deep on the downstream side of the silt fence, and
Freezing weather can result in ice forming in the basin. Some special
Maintenance Inspect temporary diversions once a week and atterevcryminfalr. Immediately
as close as possible to the fabric, enabling posts to support the fabric from
precautions should be taken in the winter to prevent the skimmer from
ve sediment from the If -arc. and repair the diversion ridgr. Carefully
upstream water pressure.
plugging with ice.
check outlets acid make timely repairs as needed. When she area protected is
4, install posts with the nipples facing away from the silt fabric.
permanently stabilized, remove the ridge and the channel to blend with the
n.furat gn•und level and appmpri.tcly 5eabi Iiu it.
S. Attach the fabric to each post with three ties, all spaced within the top 8
inches of the fabric. Attach each tie diagonally 45 degrees through the fabric,
with each puncture at least 1 inch vertically apart. Also, each tie should be
positioned to hang on a past nipple when rightened to prevent sagging-
6. Wrap approximately 6 inches of fabric around the end posts and secure
with 3 ties.
7. No more than 24 inches of a 36 inch fabric is allowed above ground
level-
& The installation should be checked and corrected for any deviations before
compaction.
9. Compaction is vitally important for effective results. Compact the soil
immodiately next to the silt fence lebric with the front wheel of the tractor,
skid steer, or roller exerting at least 60 pounds per square inch. Compact the
upstream side first, and then each side twice for a total of 4 trips.
Maintenance Inspect sediment fences at least once a week and after each rainfall. Make any
required repairs immediately.
Should the fabric of a sediment fence collapse, tear, decompose or become
ineffective, replace it promptly.
Remove 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.
Remove all fencing materials and unstable sediment deposits and bring the
area to grade and stabilize it after the contributing drainage area has berm
........,..I....-I:l:.... .-In';­
Location: PUBLICATION OR REUSE OF THESE DRAWINGS OR ANY DETAILS WITHIN MUST BE WITH THE WRITTEN CONSENT OF PIEDMONT DESIGN ASSOCIATES, P.A.
Owner:
Natural Ground
Figure 6.55a Rock pipe inlet protection plan view and cross-section view
Construction 1. Clear the area ofall debris that might hinder excavation and disposal of
Specifications spoil.
2. install the Class R or Class T riprap in a semi -circle around the pipe
inlet. The stone should be built up higher on each end where it ties into the
embankment. The minimum crest width of the riprap should be 3 feet, with a
minimum bottom width of 1 l feet. The minimum height should be 2 feet. but
also I loot lower than the shoulder of the embankment or diversions.
3. A 1 foot thick layer of NC DOT ifs or 957 stone should be placed on the
outside slope ofthe riprap.
4. The sediment storage area should be excavated around ore outside ofthe
stone horseshoe 18 inches below natural grade.
5. When the conmbating drainage area has been stabilized, fill depression
and establish final grading elevations, compact area properly, and stabilize
with ground cover.
Maintenance Inspect rock pipe inlet protection at least weekly and after each significant (Ih
inch or greater) rainfall event and repair immediately- Remove sediment and
restore the sediment storage area to its original dimensions when the sediment
has accumulated ha one-half the design dcplh of the trap. Place the sediment
that is removed in the designated disposal area and replace the contaminated
part of the gravel facing.
Check the structure for darrage. Any riprap displaced from the stone horseshoe
must be replaced immediately.
After all the sediment -producing areas have been permanently stabilized,
remove the structure and all the unstable sediment. Smooth the area to
blend with the adjoining areas and provide permanent ground cover (S2wfare
Smhilizatiot)-
Approved:
STRAW WATTLE INSTALLATION GUIDE
N (3)
NORTH DIAGRAM A
AMERICAN
GREEN
3' (0.91m)
CENTER MINIMU I 1
`/
9" 22.9 cm)-t--� J
/; r
5 cm) --
® TYPICAL WATTLE SPACING > I51
BASED ON SLOPE GRADIENT LL__
1LL
la'
a.BP -1. +: i --
21
1
(7.5 c ) 20' fit-
a:a
Iii
9'2. cm)
1. BEGIN AT THE LOCATION WHERE THE WATTLE IS TO BE INSTALLED BY EXCAVATING A 2-3" 5-7.5 CM) ) WIDE
DEEP X 9" 22.9 CM E
TRENCH ALONG THE CONTOUR OF THE SLOPE. EXCAVATED SOIL SHOULD BE PLACED UPSLOPE FROM THE ANCHOR TRENCH.
1. PLACE THE WATTLE IN THE TRENCH SO THAT IT CONTOURS TO THE SOIL SURFACE. COMPACT SOIL FROM THE EXCAVATED TRENCH
AGAINST THE WATTLE ON THE UPHILL SIDE. ADJACENT WATTLES SHOULD TIGHTLY ABUT.
3. SECURE THE WATTLE WITH 18-24" (45.7-61 CM) STAKES EVERY 3-4' (0.9 -1.2 M) AND WITH A STAKE ON EACH END. STAKES
SHOULEAVING LD BE DRIVEN THROUGH THE MIDDLE OF THE WATTLE AT LEAST 2-3" 5-7.5 CM OF STAKE EXTENDING ABOVE THE
WATTLE. STAKES SHOULD BE DRIVEN PERPENDICULAR TO THE SLOPE FACE. ( )
North American Green Straw Wattles are o Best Management Practice (BMP) that offers an effective and
economical alternative to silt fence and straw bales for sediment control and storm water runoff.
Guidelines are provided to assist in design, installation, and structure spacing. The guidelines may require
modification due to variation in soil type, rainfall intensity or duration, and amount of runoff affecting the
application site.
To maximize sediment containment with the Straw Wattle, place the initial structure at the tap/crest of the slope
if significant runoff is expected from above. If no runoff from above is expected, the initial Straw Wattle can be
installed at the appropriate distance downhill from the top/crest of the slope. The final structure should be
installed at or just beyond the bottom/toe of the slope. Wattles should be installed perpendicular to the primary
direction of overland flow.
Straw Wattles are a temporary sediment control device and are not intended to replace rolled erosion control
products (RECPs) or hydraulic erosion control products (HECPs). If vegetation is desired for permanent erosion
control, North American Green recommends that RECPs or HECPs be used to provide effective immediate erosion
control until vegetation is established. Straw Wattles may be used in conjunction with blankets, mats, and mulches
as supplemental sediment and runoff control for these applications. Like all sediment control devices, the
effectiveness of the Straw Wattle is dependent on storage capacity.
14649 HIGHWAY 41 NORTH, EVANSVILLE, INDIANA 47725
1-800-772-2040 TOLL FREE 812-867-6632
www.nngreen.com
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REVISIONS
BY
Date: 8/25/20
ar r
Scale: N/A1
Hor
Drawn: DMD
Checked: DLM
Project: 2020-03-02
,lob: 2020-03-02
Sheet
EC-
3
of 3
Sheets