HomeMy WebLinkAboutpg 4CONSTRUCTION SPECIFICATIONS
1. Clear the area of all debris that might tinder excavation and
disposal of spoil.
2 Grade shallow depression uniformly towards the inlet with side
slopes no greater than 21. Grade a 14cot wide Level area set 4 inches
below the area adjacent to the inlet
3. Install the Class B or Class I riprap in a circle around the inlet
The minimum crest width of the riprap should be 18 inches, with a
minimum bottom width of 7.5 feet The minimum height of the stone
is 2 feet
4. The outside face of the riprap is then lined with 12 inches of NC
DOT $5 or f57 washed stone.
iZ"r I"1 1:13001ill
Inspect rock doughnut inlet protection at least weekly and after each
significant (1/2 inch or greater) rainfall event and repair immediately.
To provide satisfactory inlet protection efficiency, remove sediment
tram the sediment pool area when the volume is decreased by half.
This will help provide adequate storage volume for the next rain
Stabilize excavated material appropriately.
Take care not to damage or undercut the structure during sediment
removal. Remove debris from the inlet and replace stone as needed.
If the inlet was covered with wire mesh the mesh should be cleared of
debris.
When the contributing drainage area has been adequately stabiltzed,
remove all materials and dispose of sediment properly. Bring the
disturbed area to the grade of the drop inlet Smooth and compact as
it is needed.
Appropriately stabilize all bare areas around the inlet with ground
cover.
DEWATERING CONCRETE BLOCK
TEMPORARY SEDIMENT
POOL
1' MIN
2' MAX
SEDIMENT
2:1 SLOPE, GRAVEL FILTER
WIRE DEWATERING
\%\ q %it 1/14
r•g•
TYPICAL BLOCK de GRAVEL INLET PROTECTION DETAIL
NTS
PERMANENT SEEDING SPECIFICATION
1. NI disturbed areas shall be dressed to typical sections and plowed to a depth of 5 inches.
The top 2 inches shall be pulverized to provide uniform seedbed. NOTE: Line should be applied
with necessary equipment to give uniform distribution of these materials The Fond - bucket
method is not acceptable. Lime and fertilizer should be Incorporated into the soil prior to
2. The following are rates and kinds of these materials to be oppusd PER ACRE:
gINQ BAIES.
Abruzzi Rye 50 Ibs
Pensacola Banngross 50 His.
Kentucky 31 Fescue 50 Ibs
Korean Lespedeza 15 Ibs.
Centipedegrass 501bs
Common Bemnudogrosa 25 Ibs
10 -20-20 Fertilizer 500 lb a.
Agricultural Umestone 4000 tbs.
3. Seeded orso shot be cuftipadked to firm seedbed and to cover seed.
4. Grain straw shall be applied over seeded areas as mulch. No bare ground shall be visible
n the mulched ilea if proper applications is achieved. Thick clumps of straw are not
permissible as uniform coverage Is expected. Straws shell be opplbd at a minknum of 4000
5. The mulched area shall be tacked with liquid asphalt sufficient too hold straw in place
when directed by Engineer.
6. Ditch treatment shall be used in seas where steep grades could cause ditch erosion. Use
of jute mesh, excelsior matting, or fiberglass roving is acceptable. ditch treatment should be
installed before mulching operation.
7. Budder is to provide a permanent ground cow sufficient to restrain erosion an such
exposed areas within 15 working days or go calendar days, whichever Is shorter, after
completion of construction or development
Approved Toil Fescue Cultivors:
Anthem Adventure Adventure It Amigo
Austin Apache Apache II Arid
Chapel Hill Brookstone Bonanza Bonanza It
Crossfire it Chesopeaka Chieftain Coronado
Falcon Debutante Duster Falcon
Geneses Finelwwn Petite Finelown Finelown I
Jaguar Gronde Guardian Houndog
Monarch Jaguar III Kentucky 31 Kitty Hawk
Pacer Montauk Mustang Olympic
Rebel Phoenix Pixie Pyramid
Sartori Rebel Jr. Rebel II Renegade
Tomahawk Shenandoah Tempo Titan
W(Afpaek Trailblazer Tribute Vegas
Wrangler
Fertilizer shall be 10 -20 -20 analysis. Upon written approval of the Engineer, a different
analysis of fertilizer may be used provided the 1 -2 -2 ratio is maintained and the rate of
application adjusted to provide the same amount of plant food as a 10 -20-20 analysis.
SIDE
IX A �c Rr rte,
wtTP HOLE
fUR OE14ATate1G
F 2l SIDE
14ARDW RE C.DrolT err
HAUJIMUE CLOTH N NADw
DPNNACE AND MOVEMENT. Nr. T
smeala
i
i
TEMPORARY EXCAVATED DROP INLET PROTECTION
Ms
O
CONSTRUCTION SPECIFICATIONS
1. Clear the entrance and exit area of all vegetation, roots, and other
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 water to a sediment trap or other suitable
outlet.
4. Use geotextile fabrics because they improve stability of the foundation
in locations subject to seepage or high water table.
MAINTENANCE_
Maintain the grovel pad in a condition to prevent mud or sediment from leaving
the construction site. This may require periodic topdressirlg with 2 -inch stone.
After each rainfall, inspect any structure used to trap sediment and clean
it out as necessary. Immediately remove ail objectionable materials spilled, washed,
or tracked onto public roadways.
GRAVEL ENTRANCE SHALL BE 50 FEET /
IN LENGTH AND 20 FEET IN WIDTH
WITH 20 FOOT RADIUS AT DOS'RNG
ROADWAY
36'-0' MIN 4' -0" tfy -0'
8
FILTER FABRIC -3• WASHED STONE
GRAVEL CONSTRUCTION ENTRANCE
TEMPORARY GRAVEL
CONSTRUCTION ENTRANCE
N.T.S.
FERTII VI R tOPDRFSdNG:
Fwtiize, used for topdressing on all roadway areas except slopes 2:1 and steeper shall be 10 -20 -20
written ,Npprovvl of the Engineer, o different analysis of fertilizer may be used provided grade and shall be
applied nt the rate of 500 pounds per we (560kg per hectare). Upon the 1 -2 -2 ratio Is maintained
and the into of application adjusted to provide the same amount of plant food as 10 -20-20 onolysis
Fertile.. used fa topmessing an slopes 2:1 and steeper and waste and borrow areas shall be 16 -8-8
grade ,v,J shall be applied at the rote of 500 ponds per we (560 kg per hectare). Upon written
appror,i of the Engineer, a different analysis of fertilizer may be used provided the 2 -1 -1 ratio is
monto:,ed and the rate of application adjusted to provide the same amount of plant food as 16 -8-8
analysis
Crimping Straw Mulch:
Crimping will be required on these project adjacent to any section of roadway where traffic is to be
ranto,ned or allowed during construction. In seas within six feet (2 meters) of the edge of pavement,
straw is to be crimped and the immediately tacked with asphalt tack
Crimping of straw in lieu of asphalt tack will be ollowed an this project subject to the following conditions:
All ands seeded and mulched shall be crimped ond /or tacked with asphalt as directed by the Engineer.
Crimping wit be limited to slopes 4:1 or flatter unless the Contractor con demonstrate to the Engineer
that the steeper dopes con be negotiated without altering the typical section.
Strove mulch to be of sufficient length and qunity to withstand the crimping operation and provide
adequate ground cow.
Crimping equipment including power source shall be subject to the approval of the Engineer providing that
maximun, spacing of crimper blades shall not exceed 8 nch" (200 mm).
MAINTLHANCE qyl D I E�
1. All erosion and sediment control practices will be checked for stability and operation
following every storm event, but in no case less than once every week Any repairs or leaning
necessary to maintain erosion and sediment control practices shall be completed immediately.
2 All weeded areas will be refertilized, reseeded as necessary, and mulched according to the
The kinds of seed and fertilizer, and the rates of application of seed, ferdizer, and limestone,
Shall He as stotea belor. During periods of overtopping dates, the kind of seed to be used
shall I,. determined by the Engineer. All rates per are (kilograms per hectare.)
M,vch 1 - August 31 September 1 - February 28
5Of (55kg) Tall Fescue 5oi (55kg) Tall FEscua
sf (61,q) Centipede 5/ (6kg) centipede
25I (28kg) Bwmudagrass (hulled) 354 (401ag) Bermudogras (unhulled)
5o0/ (5ri0kg) Fertilizer SDO/ (560kg) Fertilizer
40" (4500kg) Limestone 4000/ (45DOkg) Limestone
Vopes 21 and Steeper and waste and Borrow Locations:
M,s.h 1 - August 31 September 1 - February 28
75f (85kg) Tall Fescue 751 (85kg) Tail Fescue
25F (28kg) Bennudogrose (hulled) 354 (40kg) Bermudagras (unhulled)
50DF (560kg) Fertilizer 500f (560kg) Fertilizer
40000 (4500kg) Limestone 40001 (4500kg) Limestone
EXCAVATED APIA AS REQuIRD
ON
iTV
TEMPORARY EXCAVATEp INLET PROTECDON
gm
ttA
VEL- SLPPOmm as
DOME CLOTH To ALLdr
anon AAU fES RK7
FIL FNb,ms' GACURRENT
,sxAaa,Ia Han, (Value To BE CLEARED
OPTIONAL
GABION INLET PROTECTION BOX
(PATENT BY AUTRY GRADING CO.)
PIPE OUTU' TO FLAT AREA -
NO WELL- DEFINED CHANNEL
Nw_n
w�ii } +ti• r�r���r,
f• ".'rr��r r ��Vr1
• a
M
1. La is uis length of the riprap opron.
2, D=1,'• times the maximum stone
dkrrnelw but not less than 6 ".
3. In a +Al-defined channel extend the
apron up the channel banks to an
dewhan of 6" above the maximum
taiwalar depth of to the top of the
bank whichever Is less
4. A falter blanket w filter fabric should
be e,,tulled between the riprap and
sou Inundation.
rrNSTRUr ICON SPECIFICATIONS_
1. Ensure that the subgrade for the filter and riprap follows the required fines
and yiudea shown In the plan. Compact any fill required In the subgrade to the
density of the surrounding undisturbed materiel. Low arecs in the wbgrade an
undisturbed sod may Disc, be filled by increasing the riprap thickness
2 The riprop and growl 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 filter Goth over the damaged
area. All connecting joints should overlap so the top layer is above the
downstream layer a minimum of 1 foot. If the damage is extensive, replace
the ease filter cloth.
4. Ripens• may be placed by equipment, but take care to avoid damaging the
filter
5. The minimum thickness of the riprap should be 1.5 times the maximum
stone diameter.
6. Ripw may be field stone or rough quarry stone. It should be hard,
angular, highly weather - resistant and wall graded.
7. Conshuct the apron on zero grade with no overfill at the end. Make the
top c,1 the riprap at the downstream end level with the receiving area or slightly
below it.
S. Ensure that the apron is 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 apran-
9. Immediately after construction, stabilize all disturbed areas with vegetation
(Practices 6.10, 9-ps vp Aedu.p and 6.11, O:vwe,.wd. Awknii
MAINIEtl a
Inspect riprap outlet structures weekly and after significant (II inch or greater)
rainfall e.wnts to see if any erosion around or below the riprap has taken place,
or if stones how been dislodged. Immediately make all needed repass to
prevent fiether damage.
RIP -RAP OUTLET PROTECTION
NTS
I- 5' MIN.
12" min. of NCDOT #5 j`'I 1.5'
or #57 washed stone--\
FRANK\10- 1224 -fit THE 5UMMR - SECTION FOUR \PLANS \DETAILS \MASTER rIL7NLS.DWG
TEMPORARY SEDIMENT TRAP
CONSTRUCTION SPECIFICATIONS
1. Clear, grub and strip the area under the embankment of all vegetation and root mat Remove all surface sell containing
high amounts of organic matter, and stockpile or dispose of it properly. Haul all objectionable material b the designated
disposal aces.
2 Ensure that fill material for the embankment is free of roots, woody vegetation, organic matter and other objectionable
material. Place the fig in lifts rat b exceed 9 inches, and machine compact it Over fill the embankment 6 inches b allow for
settlement
3. Construct the outlet section in the embankment Protect the connection between the riprap and the soil from piping by
using filter fabric or a keyway cutoff trench between the riprap structure and soil.
.Place the filter fabric between the riprap and the suit. Extend the fabric across the spillway foundation and sides to the top of
the dam' or
*Excavate a keyway trench along the centerline of the spillway foundation extending up the sides to the height of the dam. The
trench should be at least 2 feet deep and 2 feet wide with 1:1 side slopes.
4. Clear the pond area below the elevation of the crest of the spillway to facilitate sediment cleanout.
5. AI cut and fill slopes should be 21 or flatter.
6. Ensure that the stone (drainage) section of the embankment has a minimum bottom width of 3 feet and maximurn side
slopes of 1:1 that extend to the bottom of the spillway section.
7. Construct the minimum finished stone spillway botbm width, as shown on the plans, with 21 side slopes extending to the
top of the over filled embankment Keep the thickness of the sides of the spillway outlet structure at a minimum of 21 inches.
The weir must be level and constructed to grade to assure design capability.
8. Material used in the stone section should be a well-graded ouxture of stone with a d50 size of 9 inches (class B erosion
control store is recommended) and a maximum stone size of 14 inches. The stone may be machine placed and the smaller stores
worked into the voids of the larger stores. The stone should be hard, angular and highly weather - resistant
9. Discharge inlet water into the basin in a manner to prevent erosion. Use temporary slope drains or diversions with outlet
proection to divert sediment4aden water to the upper end of the pool area to improve basins trap efficiency ( References: Runoff
Control Measures and Outlet Protection).
10. Ensure that the stone spillway outlet section extends downstream past the the of the embankment until stable conditions
are reached and outlet velocity is acceptable for the receiving stream. Keep the edges of the stone outlet section flush with the
surrounding ground, and shape the center to confine the outflow stream (References: Surface Slabilizaimn) .
11. Direct emergency bypass to natural, stable areas. Locate bypass outlets so that flow will not damage the embankment
12 Stabilize the embankment and all disturbed areas above the sediment pool and downstream from the trap immediately
after construction ( References: Surface Stabilization) .
13. Show the distance from the top of the spillway to the sediment deanout level (1/2 the design depth) on the plans and nark
it in the field.
14. Install porous baffles as specified in Practice 6.65, Porous Baffles.
MAINTENANCE
InspeM to m c, m ry sedunent traps at least week) y and after each si gn'ficam 1/
2inch or greater) rainfall
event and repair
immediately. Remove sediment, and restore the trap to its original dimensions when the Sediment has accumulated to one -half
the design depth of the trap. Place the sediment that is removed in the designated disposal area, and replace the part of the
gravel facing that is impaired by sediment
Check the structure for damage from erosion or piping. Periodically check the depth of the spillway to ensure it is a minimum of
1.5 feet below the low point of the embankment Immediately fill any settlement of the embankment to slightly above design
grade. Any riprap displaced from the spillway must be replaced immediately.
After all sediment - producing areas have been permanently stabilized, remove the structure and all unstable sediment. Smooth
the area to blend with the adjoining areas, and stabilize properly. (References: Surface Stabilization)
TEMPORARY SEDIMENT TRAP
N.T.S.
Riater and Early Spring
SEEDING WATIRf
SPECIES RATE (LB./AC )
Rye (grain) 120
Annual lespedeza (kobe in
Piedmont and Coastal Plain,
Korean in Mountains) 50
Omit annual lespedezo when duraton of temporary cowl is
not to extend beyond June.
SEEDING DATES
Mountains - -Above 2500 ft. Feb. 15 -May 15
Below 2500 ft. Feb. 1 -May 1
Piedmont - -Jon. 1 -May 1
Coastal Plain- -Dec. 1 -Apr. 15
SOIL AMENapENTS
Follow recommendations of soil tests or apply 2.000 It, /we
ground agriculture limestone and 750 lb./acre 10 -10-10 fertilizer.
MULCH
Apply 4,000 lb. /acre straw. Anchor straw by tacking with asphalt,
netting, or a mulch anchoring tool. A disk with blades set nearly
straight can be used as a mulch anchoring tool.
MAINTENANCE
Refertilize if growth is not fully adequate. Reseed, refertilize
and mulch immediately following erosion or other damage.
TEMPORARY SEEDING RECOMMENDATIONS (b)
TEMPORARY SEEDING RECOMMENDATIONS (a)
Fall
SEEDING FrxTUIE
RATE (LB. /ACRE)
Rye (grain) 120
SEEDNG DATES
Mountains--Aug. 15 -Dec. 15
Coastal Plain and piedmont - -Aug. 15 -Dec. 30
SOIL AMENa1ENTS
Follow soil tests or apply 2,000 Ib. /ocre ground ogriculturd
limestone and 1,000 lb./acre 10 -10-10 fertilizer.
Apply 4,000 Ib. /ocre straw. Anchor straw by tacking with asphalt,
netting. or a mulch anchoring tool. A disk with blades set nary
straight con be used as a mulch anchoring tool.
MAINTENANCE
Repair and refertilize damaged areas immediately. Topdress with
50 lb./acre of nitrogen in march. If it is necessary to extend
temporary cover beyond June 15, overseed with 50 lb. /acre
Kobe (Piedmont and Costal Plain) or korean (Mountains) lespedza
in late February or early March.
Summer
SEEDING WTLRE
sreag RATE (LB. /AmE)
German millet 40
In the Piedmont and Mountains, a small- stemmed Sudangross may
by substituted at a rate of 50 lb./owe.
SEEDING DATES
Mountains- -May 15 -Aug. 15
Piedmont- -May 1 -Aug. 15
Coastal Plain- -Apr. 15 -Aug. 15
SOIL AMEN WENTS
Follow recommendations of soil tests or apply 2,000 lb /acre
ground agriculture limestone and 750 Ib. /acre 10 -10 -10 fertilizer.
MULCH
Apply 4,000 lb./acre straw. Anchor straw by tacking with asphalt,
netting, or a mulch anchoring tool. A disk with blades set newly
straight can be used as a mulch anchoring tool.
MAINTENANCE
Refertilize if growth is not fully adequate. Reseed, refertilize
and mulch immediately following erosion or other domuge.
The Slicing Method
Figure 6.62b
Drive over each side of silt
th fabric fence 2 to 4 times with
8' max. standard strength device exerting 60 p.s.i. or
with wire fence 6' max. extra - nrnnter
the trench y
PLAN VIEW
NTS
Plastic "" Backfill trenctl
3600 CU.
FT /ACRE s
?. MAX.
fabric thoroughly
Vq
above
Qground
Natural
Dos
,,, ground
d'
W
1, I I I
air I 1 I I \�Irrrl rrcj -1
\\- j��- ��l�llt'
Slicing blade
Installation
IIQ
I
Vibratory plow is not acceptable because
of horizontal compaction
0
LU
J
J
FILTER FABRIC
F-
LL
in
Z
CROSS SECTION OVERFILL Be
FOR
O
``
J
p1-fS
SETTLEMENT
F
Of
_
\C
�
Q
W
U-
Design settled
U
to
LU
0
U
top
�LLLLaa_J
W
>
F-
Q
4' MIN.
U
a
S
W
a
2
�2:1
EMERGENCY
5' f
SIDE SLOPE MAX
BY -PASS
6" BELOW
max. /
fill
EXIST. GRADE
OF p TOP
2' to 3.5'
FILTER FABRIC
1:1 SIDE SLOPE MAX
3' MIN.
CLASS B RIP RAP
STONE SECTION
NTS
FRANK\10- 1224 -fit THE 5UMMR - SECTION FOUR \PLANS \DETAILS \MASTER rIL7NLS.DWG
TEMPORARY SEDIMENT TRAP
CONSTRUCTION SPECIFICATIONS
1. Clear, grub and strip the area under the embankment of all vegetation and root mat Remove all surface sell containing
high amounts of organic matter, and stockpile or dispose of it properly. Haul all objectionable material b the designated
disposal aces.
2 Ensure that fill material for the embankment is free of roots, woody vegetation, organic matter and other objectionable
material. Place the fig in lifts rat b exceed 9 inches, and machine compact it Over fill the embankment 6 inches b allow for
settlement
3. Construct the outlet section in the embankment Protect the connection between the riprap and the soil from piping by
using filter fabric or a keyway cutoff trench between the riprap structure and soil.
.Place the filter fabric between the riprap and the suit. Extend the fabric across the spillway foundation and sides to the top of
the dam' or
*Excavate a keyway trench along the centerline of the spillway foundation extending up the sides to the height of the dam. The
trench should be at least 2 feet deep and 2 feet wide with 1:1 side slopes.
4. Clear the pond area below the elevation of the crest of the spillway to facilitate sediment cleanout.
5. AI cut and fill slopes should be 21 or flatter.
6. Ensure that the stone (drainage) section of the embankment has a minimum bottom width of 3 feet and maximurn side
slopes of 1:1 that extend to the bottom of the spillway section.
7. Construct the minimum finished stone spillway botbm width, as shown on the plans, with 21 side slopes extending to the
top of the over filled embankment Keep the thickness of the sides of the spillway outlet structure at a minimum of 21 inches.
The weir must be level and constructed to grade to assure design capability.
8. Material used in the stone section should be a well-graded ouxture of stone with a d50 size of 9 inches (class B erosion
control store is recommended) and a maximum stone size of 14 inches. The stone may be machine placed and the smaller stores
worked into the voids of the larger stores. The stone should be hard, angular and highly weather - resistant
9. Discharge inlet water into the basin in a manner to prevent erosion. Use temporary slope drains or diversions with outlet
proection to divert sediment4aden water to the upper end of the pool area to improve basins trap efficiency ( References: Runoff
Control Measures and Outlet Protection).
10. Ensure that the stone spillway outlet section extends downstream past the the of the embankment until stable conditions
are reached and outlet velocity is acceptable for the receiving stream. Keep the edges of the stone outlet section flush with the
surrounding ground, and shape the center to confine the outflow stream (References: Surface Slabilizaimn) .
11. Direct emergency bypass to natural, stable areas. Locate bypass outlets so that flow will not damage the embankment
12 Stabilize the embankment and all disturbed areas above the sediment pool and downstream from the trap immediately
after construction ( References: Surface Stabilization) .
13. Show the distance from the top of the spillway to the sediment deanout level (1/2 the design depth) on the plans and nark
it in the field.
14. Install porous baffles as specified in Practice 6.65, Porous Baffles.
MAINTENANCE
InspeM to m c, m ry sedunent traps at least week) y and after each si gn'ficam 1/
2inch or greater) rainfall
event and repair
immediately. Remove sediment, and restore the trap to its original dimensions when the Sediment has accumulated to one -half
the design depth of the trap. Place the sediment that is removed in the designated disposal area, and replace the part of the
gravel facing that is impaired by sediment
Check the structure for damage from erosion or piping. Periodically check the depth of the spillway to ensure it is a minimum of
1.5 feet below the low point of the embankment Immediately fill any settlement of the embankment to slightly above design
grade. Any riprap displaced from the spillway must be replaced immediately.
After all sediment - producing areas have been permanently stabilized, remove the structure and all unstable sediment. Smooth
the area to blend with the adjoining areas, and stabilize properly. (References: Surface Stabilization)
TEMPORARY SEDIMENT TRAP
N.T.S.
Riater and Early Spring
SEEDING WATIRf
SPECIES RATE (LB./AC )
Rye (grain) 120
Annual lespedeza (kobe in
Piedmont and Coastal Plain,
Korean in Mountains) 50
Omit annual lespedezo when duraton of temporary cowl is
not to extend beyond June.
SEEDING DATES
Mountains - -Above 2500 ft. Feb. 15 -May 15
Below 2500 ft. Feb. 1 -May 1
Piedmont - -Jon. 1 -May 1
Coastal Plain- -Dec. 1 -Apr. 15
SOIL AMENapENTS
Follow recommendations of soil tests or apply 2.000 It, /we
ground agriculture limestone and 750 lb./acre 10 -10-10 fertilizer.
MULCH
Apply 4,000 lb. /acre straw. Anchor straw by tacking with asphalt,
netting, or a mulch anchoring tool. A disk with blades set nearly
straight can be used as a mulch anchoring tool.
MAINTENANCE
Refertilize if growth is not fully adequate. Reseed, refertilize
and mulch immediately following erosion or other damage.
TEMPORARY SEEDING RECOMMENDATIONS (b)
TEMPORARY SEEDING RECOMMENDATIONS (a)
Fall
SEEDING FrxTUIE
RATE (LB. /ACRE)
Rye (grain) 120
SEEDNG DATES
Mountains--Aug. 15 -Dec. 15
Coastal Plain and piedmont - -Aug. 15 -Dec. 30
SOIL AMENa1ENTS
Follow soil tests or apply 2,000 Ib. /ocre ground ogriculturd
limestone and 1,000 lb./acre 10 -10-10 fertilizer.
Apply 4,000 Ib. /ocre straw. Anchor straw by tacking with asphalt,
netting. or a mulch anchoring tool. A disk with blades set nary
straight con be used as a mulch anchoring tool.
MAINTENANCE
Repair and refertilize damaged areas immediately. Topdress with
50 lb./acre of nitrogen in march. If it is necessary to extend
temporary cover beyond June 15, overseed with 50 lb. /acre
Kobe (Piedmont and Costal Plain) or korean (Mountains) lespedza
in late February or early March.
Summer
SEEDING WTLRE
sreag RATE (LB. /AmE)
German millet 40
In the Piedmont and Mountains, a small- stemmed Sudangross may
by substituted at a rate of 50 lb./owe.
SEEDING DATES
Mountains- -May 15 -Aug. 15
Piedmont- -May 1 -Aug. 15
Coastal Plain- -Apr. 15 -Aug. 15
SOIL AMEN WENTS
Follow recommendations of soil tests or apply 2,000 lb /acre
ground agriculture limestone and 750 Ib. /acre 10 -10 -10 fertilizer.
MULCH
Apply 4,000 lb./acre straw. Anchor straw by tacking with asphalt,
netting, or a mulch anchoring tool. A disk with blades set newly
straight can be used as a mulch anchoring tool.
MAINTENANCE
Refertilize if growth is not fully adequate. Reseed, refertilize
and mulch immediately following erosion or other domuge.
The Slicing Method
Figure 6.62b
Drive over each side of silt
th fabric fence 2 to 4 times with
8' max. standard strength device exerting 60 p.s.i. or
with wire fence 6' max. extra - nrnnter
the trench y
PLAN VIEW
NTS
Plastic "" Backfill trenctl
or wire fence
'ter and compact
ties
fabric thoroughly
Steel
above
Qground
Natural
Dos
,,, ground
III"
Ponding height
max. 24" POST SPACING:
Attach fabric 6' max. on open runs
to upstream
side of post i 4' max. on pooling areas
FLOW
STEEL POST DEPTH:
2 feet
No more than 24"
Of a 36" fabric
is allowed above ground.
Roll of
To of Fabric
Belt
top S*
ww,re.ewn
reel.. w.sl,
ATTACHMENT DETAILS:
Gather fabric at posts,
if needed.
.Utilize three ties per post,
all within top 8" of fabric.
. Position each tie diagonally,
puncturing holes vertically
a minimum of 1" apart.
• Hang each tie on a post nipple
and tighten securely.
Use cable ties (50lbs) or soft wire.
Operation silt fence p t
CROSS - SECTION VIEW
NTS Horizon a
(Figure 6.62a Installation detail of a sediment fence.) c3" width
(3" width)
SEDIMENT FENCE
NTS
CONSTRUCTION SPECIFICATIONS
MATERIALS
1. Use a synthetic filter fabric of at least 95% b weight of olefins or
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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
(Refer to the Erosion and Sediment Control Planning and Design Manual,
Chapter 6, Section 62.2).
Synthetic filter fabric should contain ultraviolet ray inhibitors and stabilizers
to provide a minimum of 6 months of expected usable construction Ice at a
temperature range of 0 to 120' F.
2. Ensure that posts for sediment fences are 1.33 ftxAinear ft steel with
a minimum length of 5 feet. Make sure that steel posts have projections to
facilitate fastening the fabnc.
3. For reinforcement of standard strength fitter fabric, use wire fence with a
minimum 14 gauge and a maximum mesh spacing of 6 inches.
CONSTRUCTION
1. Construct the sediment barrier of stardard strength or extra strength
synthetic filter fabrics.
2. Ensure that the height of the sediment fence does not exceed 24 inches
above the ground surface. (Higher fences may impound volumes of water
sufficient to cause failure of the structure.)
3. Construct the filter fabric from a continuous roll cut to the length of the
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 post. 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 past spacing does rat require wire
mesh support fence. Securely fasten the filter fabric directly to posts. Wire k,l
plastic zip ties should have minimum 50 pound tensile strength.
7. Excavate a trench approximately 4 inches wide and 8 inchles deep along
the proposed line of posts and upslope from the tamer (Figure 6.62a).
B. Place 12 inches of the fabric along the bottom and side of the trench.
9. Backfill the trench with soil placed over the filter fabric and compact.
Thorough compaction of the backfill is critical to sift fence performance.
10. Do not attach filter fabric to existing trees
SEDIMENT FENCE INSTALLATION USING THE SLICING METHOD
Instead of excavationg a trench, placing fabric and then backfilling trench,
sediment fence mayh be installed using specially designed equipment that
inserts the fabric into a cut sliced in the grourd with a disc (Figure 6.62b).
INSTALLATION SPECIFICATIONS
1. The base of both end posts should be at least one foot higher than the
middle of the fence. Check with a level if necessary.
2. Install posts 4 feet apart in critical areas and 6 feet apart on standard
applications.
3. Install posts 2 feet deep on the downstream side of the sift fence, and
as close as possible to the fabric, enabling posts to support the fabric from
upstream water pressure.
4. Install posts with the nipples facing away from the sift fabric.
5. 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 post nipple when tightened 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.
8. The installation should be checked and corrected for any deviations before
compaction.
9. Compaction is vitally important for effective results. Compact the soil
immediately next to the silt fence fabric 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
at least once a week and after each rainfall. Make an
Inspect sediment fences Y
P
required repairs immediately.
Should the fabric of a sediment fence collapse, tear, decompose or become
ineffective, replace A 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 been
properly stabilized.
DRAWN BY: RSW / CCB
CHECKED: JMK JR.
REVIEWED: JMK JR.
DATE:
AUGUST 21112
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SEDIMENT FENCE INSTALLATION USING THE SLICING METHOD
Instead of excavationg a trench, placing fabric and then backfilling trench,
sediment fence mayh be installed using specially designed equipment that
inserts the fabric into a cut sliced in the grourd with a disc (Figure 6.62b).
INSTALLATION SPECIFICATIONS
1. The base of both end posts should be at least one foot higher than the
middle of the fence. Check with a level if necessary.
2. Install posts 4 feet apart in critical areas and 6 feet apart on standard
applications.
3. Install posts 2 feet deep on the downstream side of the sift fence, and
as close as possible to the fabric, enabling posts to support the fabric from
upstream water pressure.
4. Install posts with the nipples facing away from the sift fabric.
5. 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 post nipple when tightened 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.
8. The installation should be checked and corrected for any deviations before
compaction.
9. Compaction is vitally important for effective results. Compact the soil
immediately next to the silt fence fabric 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
at least once a week and after each rainfall. Make an
Inspect sediment fences Y
P
required repairs immediately.
Should the fabric of a sediment fence collapse, tear, decompose or become
ineffective, replace A 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 been
properly stabilized.
DRAWN BY: RSW / CCB
CHECKED: JMK JR.
REVIEWED: JMK JR.
DATE:
AUGUST 21112
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