SW6190901_Plan (Misc. Detail)_20191106

TEMPORARY SEEDING SPECIFICATIONS
PURPOSE
To temporarily stabilize denuded areas that will not be brought to final grade for a period of
more than 21 calendar days.
Temporary seeding controls run off and erosion until permanent vegetation or other erosion
control measures can be established. In addition, it provides residue for soil protection and
seedbed preparation and reduces problems of mud and dust production from bare soil
surfaces during construction.
SPECIFICATIONS
Complete grading before preparing seedbeds and install all necessary erosion control
practices, such as dikes waterways and basins. Minimize steep slopes because the make
P Ys P Pe Y
seedbed preparation difficult and increase the erosion hazard. If soils become compacted
during grading, loosen them to a depth of 6 - 8 inches using a ripper, harrow or chisel plow.
Liming -Apply lime according to soil test recommendations. If the pH of the soil is not known,
an application of ground agricultural limestone at the rate of 1 to 1 K2 tons/acre on
coame4extured soils and 23 tons/acre on fine -textured soils is usually suffdent. Apply
limestone uniformly and incorporate into the top 4.6 inches of soil. Soils with a pH of 6 or
higher need not be limed.
Fertilizer -Base application rates on soil tests. When these are not possible, apply
a 10-10-10
grade fertilizer at a 7OD-1000 lb/acre rate. Both fertilizer and lime should be incorporated into
the top 4-6 inches of soil. If a hydraulic seeder is used, do not mix seed and fertilizer more
than 30 minutes before application.
Surface roughening -If recent tillage operations have resulted in a loose surface, additional
roughening may not be required except to break up large clods. If rainfall causes the surface
to become sealed or crusted, loosen it just prior to seeding by disking, raking, harrowing, or
other suitable methods. Groove or furrow slopes steeper than 3:1 on the contour before
seeding.
PLANT SELECTION
Select an appropriate species or species mixture from seeding tables at right.
SEEDING
Evenly apply seed using a cyclone seeder (broadcast) drill, cultipacker seeder or
hydroseeder. Use seeding rates given in tables at right. Broadcast seeding and
hydroseeding are appropriate for steep slopes where equipment cannot be driven. Hand
broadcasting is not recommended because of the difficulty in achieving a uniform
distribution.
Small grains should be planted no more than 1 inch deep, and grasses and legumes no
more than X inch. Broadcast seed must be covered by raking or chain dragging and then
lightly firmed with a roller or cultipacker. Hydroseeded mixtures should include a wood fiber
mulch.
MULCHING
The use of an appropriate mulch will help ensure establishment under normal conditions and
is essential to seeding success under harsh site conditions. Harsh site condition include:
-seeding in fall for winter cover (wood fiber mulches are not considered adequate for
this use)
-slopes steeper than 3:1
-excessively hot or dry weather
adverse soils (shallow, rocky, or high in day or sand)
areas receiving concentrated flow
If the area to be mulched is subject to concentrated water flow, as in channels, anchor mulch
with netting.
MAINTENANCE
Reseed and mulch areas where seedling emergence is poor, or where erosion occurs, as
soon as possible. Do not mow. Protect from traffic as much as possible.
REFERENCE: NC Erosion and Sediment Control Planning and Design Manual - Practice
6.10
5'
NCDOT #:
washed st
Filtered
Water
TEMPORARY SEEDING RECOMMENDATIONS FOR LATE WINTER AND EARLY SPRING
SEEDING MIXTURE:
Rye rain 1201Wacre
Annual Lespedeza - 50 Ib/acre
-Omit annual lespedeza when duration of temporary cover is not to extend beyond June.
SEEDING DATES
Mountains - above 2500 ft.: Feb. 15 - May 15
below 2500 ft : Feb. 1 - May 1
Peidmont-Jan. 1 May 1
Coastal Plain -Dec, 1 - Apr. 15
SOIL AMENDMENTS
Follow recommendations of soil test or apply 2000 lb/acre ground agricultural limestone and 750 lb/acre
10-10-10 fertilizer.
MULCH
Apply 4D00 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 mulching tool. .
MAINTENANCE
Refertilize if growth is not fully adequate. Reseed, refertilize and mulch immediately following erosion or
other damage.
TEMPORARY SEEDING RECOMMENDATIONS FOR FALL
SEEDING MIXTURE:
Rye rain -120 lb/acre
SEEDING DATES
Mountains - Aug. 16 - Dee. 15
Peidmont - Aug. 15 - Dec. 30
Coastal Plain - Aug, 15 - Dec. 30
SOILAMENDMENYS
Follow recommendations of soil test or apply 2000 lb/am ground agricultural limestone and 750 Ib/acre
10-10-10 fertilizer.
MULCH
Apply 4000 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 mulching tool.
MAINTENANCE
Repair and refertilize damaged areas immediately. Topdress with 50 lb/acre of nitrogen in March. If it is
necessary to extend temporary ground cover beyond June 15, overseed with 50 lb/acre Lespedeza in late
February or early March.
TEMPORARY SEEDING RECOMMENDATIONS FOR SUMMER
SEEDING MIXTURE:
German Millet -40lb/acre
SEEDING DATES
Mountains - May 15 - Aug. 15
Peidmont - May 1 - Aug. 1
Coastal Plain - Apr. 15 - Aug. 15
SOIL AMENDMENTS
Follow recommendations of soil test or apply 2000 lb/acre ground agricultural limestone and 750 lb/acre
10-10.10 fertilizer.
MULCH
Apply 40001b/acre straw. Anchor straw by tadding with asphalt netting or a mulch anchoring tool. A disk
with blades set nearly straight can be used as a mulching tool.
MAINTENANCE
Refertilize if growth is not fully adequate. Reseed, refertilize and mulch immediately following erosion or
other damage.
REFERENCE - NC Erosion and Sedimentation Control Planning and Design Manual - Tables 6.10a, 6.10b
6.10c.
19-gauge hardware
doth,(Y, mesh openings)
Hardware Cloth & Gravel Inlet Protection
Reference: NC Erosion and Sedimentation Control Planning and Design Manual - Practice 6.51
ROCK BAG
NCDOT #5 or I
washed stone
El
CONSTRUCTION SPECIFICATIONS
1. Unffomtiy grade a shallow depression approaching
the inlet.
2. Drive 5-foot steel posts 2 feet into the ground
surrounding the inlet. Space posts evenly around the
perimeter of the inlet, a maximum of 4 feet apart.
3. Surround the posts with Wire mesh hardware cloth.
Secure the wire mesh to the posts at the top, middle
and bottom. Placing a 2-foot flap of the wire mesh
under the gravel for anchoring is recommended.
4. Place clean gravel (NCDOT #5 or #57) on a 2:1
slope with a height of 16 inches around the wire, and
smooth to an even grade.
5. Once the contributing drainage area has been
stabilized, remove accumulated sediment, dispose
of properly and establish final grading elevations.
6. Compact the area property and stabilize with
groundcover.
MAINTENANCE
Inspect inlets at least weekly and after each
significant K inch or greater) rainfall event. Clear the
mesh wire of any debris or other objects to provide
adequate flow for subsequent rains. Take care not to
damage or undercut the wire mesh during sediment
removal. Replace stone as needed.
ROCK BAG/ TUBE OR CURB INLET DRAIN FILTER INSTALLATION -
GENERAL INSTALLATION REQUIREMENTS: (SEE INDIVIDUAL MANUFACTURERS FOR DETAILS INSTALLATION INSTRUCTIONS)
• INSTALL THE INLET PROTECTION AS SHOWN ABOVE. EACH
END OF THE TUBE SHOULD BE SECURED AT BACK OF BASIN.
• THE TUBE SHOULD BE CLEANED IF A VISUAL INSPECTION SHOWS SILT AND DEBRIS BUILD
UP AROUND THE TUBE.
• TO REMOVE THE TUBE, LIFT OUT OF THE OPENING.
ROCK BAG/SEDIMENT FILTERING BAG SPECIFICATIONS
BAG MATERIAL: HIGH pENSITY POLYETHYLENE -COVERING FIBER MATRIX BLANKET
�RIIEIGTOR DRROCCK: 3/8 PEA GRAVEL
*►USE�A POWER WASHER OR STRONG HOSE FOR CLEANING"
FLOW TEST RESULTS:
FREE FLAW WATER (NO DEBRIS) 30 GPM
SAND 29 GPM
TOP SOIL 28 GPM
CLAY 24 GPM
EXAMPLES OF ROCK BAGS:
ROCSOC BY MARATHON MATERIAL, INC.
SILT SIFTER BY POLLUTION SOLUTIONS, INC.
EXAMPLE(S) OF CURB INLET FILTRATION TUBE
GUTTERBUDDY BY ACF ENVIRONMENTAL
CATCH-ALL BY MARATHON MATERIALS, INC.
PERMANENT SEEDING SPECIFICATIONS
PURPOSE
To reduce erosion and decrease sediment yield from listurbed areas, and to
permanently stabilize such areas in a manner that is, conomical, adapts to site
conditions, and allows selection of the most appropriate plant materials.
Areas to be stabilized with permanent vegetation mus: be seeded or planted within 15
working days or 90 calendar days after final grade is , eached, whichever period is
starter.
PLANT SELECTION
See table at right. Use certified seed for permanent v eding whenever possible.
Certified seed is inspected by the North Carolina Crot Improvement Association.
Labeling of non-ceniried seed is required by law.
SEEDBED PREPARATION
Install necessary mechanical erosion control practice, before seeding, and compete
grading according to the approved plan.
Lime and fertilizer needs should be determined by soi tests. When soil tests are not
available, follow rates suggested on table at right ApNicetion rates ususally fall into
the following ranges:
-Ground agricultural limestone
Light -textured, sandy soils: 1 -1 Y2 tons/ acre
Heavy -textured, clayey soils: 2 -3 tons/a, re
-Fertilizer
Grasses800 -1200 lb/acre of 10-10-10 , orequivalent)
Grass -legume mixtures: 800-1200lb/acre 5-10-10.
Apply lime and fertilizer evenly and incorporate into the top 4-6 inches of soil by
disking or other suitable means. Operate machinery on the contour. When using a
hydroseeder, apply lime and fertilizer to a rough, loose surface.
Complete seedbed preparation by breaking up large , ads and raking into a smooth,
uniform surface (slopes less than 3:1). Fill in or level repressions that can collect
water. Broadcast seed into a freshly loosened seedbed that has not been sealed by
rainfall.
MULCHING
The use of an appropriate mulch will help ensure estaolishment under normal
conditions and is essential to seeding success under ,,arch site conditions. Harsh site
conditions include:
-slopes steeper than 3:1
-excessively hot or dry weather
-adverse soils (shallow, rocky, or high in clay o• sand)
areas receiving concentrated water flow
If the area to be mulched is subject to concentrated w Aer flow, as in channels, anchor
mulch with netting.
IRRIGATION
Moisture is essential for good seed germination and seedling establishment.
Supplemental irrigation can be very helpful in assuring, adequate stands in dry seasons
or to speed development of full cover. Water applicab, an rates must be carefully
controlled to prevent runoff. Inadequate or excessive amounts of water can be more
harmful than no supplemental water.
MAINTENANCE
Generally a stand of vegetation cannot be determined to be fully established until soil
cover has been maintained for one full year past plan: ng. Inspect seeded areas for
failure and make necessary repairs and reseedings w thin the same season, if
possible.
Reseeding -If a stand has inadequate cover, re-evalu.de choice of plant materials and
quantities of lime and fertilizer. Re-establish the stanc after seedbed preparation or
over -seed the stand. Consider seeding temporary, arwal spectres if the time of year is
not appropriate for permanent seeding.
If the vegetation fails to grow, have soil tested to date, mine ff acidity or nutrient
imbalance is responsible.
Fertilization -On the typical disturbed site, full establis nment usually requires
refertilization in the second growing season. Fine turf squires annual maintenance
fertilization. Use soil tests it possible or follow the guic elines given for the specific
seeding mixture.
REFERENCE - NC Erosion and Sediment Control Planning and Design Manual -
Pracbce 6.11
FOR WELL -DRAINED SANDY LOAMS TO DRY SANDS: LOW
MAINTENANCE
MIXTURE:
Pensacola Bahiagrass - 50 Wears
Serices lespedeza - 30 lb/acre
Common Bennudagrass -10 lb/acre
German millet -101b/acre
SEEDING NOTES:
1. Where a neat appearance is desired, omit sericea.
2. Use common Bernudagrass only on isolated sites where it
cannot become a pest. Bermudagrass may be replaced with 5
lb/acre centipedegrass.
SEEDING DATES;
Apr 1 - July 15
SOIL AMENDMENTS
Apply lime and fertilizer according to soil tests, or apply 3000 lb/acre
ground agricultural limestone and 500 lb/acre 10-10-10 fertilizer.
MULCH
Apply 4000 lb/acre grain straw or equivalent cover of another
suitable mulch. Anchor by tacking with asphalt, roving or netting or
by crimping with a mulch anchoring tool. A disk with blades set
nearly straight can be used as a mulch anchoring tool.
MAINTENANCE
Refertilize the following April with 50 Wears nitrogen. Repeat as
growth requires. May be mowed only once a year. Where a neat
appearance is desired, omit sericea and mow as often as needed.
REFERENCE - NC Erosion and Sediment Control Planning and
Design Manual, Table 6.11t
WELL to POORLY DRAINED SOILS with GOOD MOISTURE
,RETENTION: LOW MAINTENANCE
MIXTURE:
Tall Fescue - 80 lb/acre
Pensacola Bahiagrass - 50 lb/acre
Sericea lespedeza - 30 lb/acre
Kobe lespedeza - 10 lb/acre
SEEDING NOTES:
1. From Sept. 1 - Mar. 1, use unscarr ed sericea seed.
2. On poorly drained sites omit sericea and increase Kobe to 30
Wears.
3. Where a neat appearance is desired, omit sericea and increase
Kobe to 40 Wears.
NURSE PLANTS
Between Apr. 15 and Aug 15, add 10 Wears German millet or 15
Ib/acre Sudangrass. Prior to May 1 or after Aug. 15, add 25 lb/acre
rye (grain).
SEEDING DATES;
Early spring - Feb. 15-Mar. 20 (best) Feb. 15 - Apr. 30 (possible)
Fall - Sept. 1 - Sept. 30 (best) Sept. 1 - Oct. 21 (possible)
SOIL AMENDMENTS
Apply lime and fertilizer according to soil tests, or apply 3000-5000
lb/acre ground agricultural limestone (use the lower rate on sandy
soils) and 1000 lb/acre 10-10.10 fertilizer.
MULCH
Apply 4000 lb/acre grain straw or equivalent cover of another
suitable mulch. Anchor by tacking with asphalt, roving or netting or
by crimping with a mulch anchoring tool. A disk with blades set
nearly straight can be used as a mulch anchoring tool.
MAINTENANCE
If growth is less than fully adequate, refertilize in the second year,
according to soil test or topdress with 500 Wears 10-10-10 fertilizer.
Mow as needed when sericea is omitted from the mixture. Reseed,
fertilize and mulch damaged areas immediately.
REFERENCE - NC Erosion and Sediment Control Planning and
Design Manual, Table 6.11 p
Construction Specifications
Materials
1. Determine whether the quality and quantity of available topsoil justifies selective handling. Quality
topsoil has the following characteristics:
a. Texture -loam, sandy loam, and sift loam are best; sandy clay loam, silty clay loam, clay loam, and
sand are fair. Do not use heavy clay and organic soils such as peat or muck for topsoil.
b. Organic matter content - should be greater thanl.5% by weight.
c. Acidity - pH should be greater than 3.6 before liming, and liming is required if it is less than 6.0.
d. Soluble salts- should be less than SOD ppm.
e. Sodium - sodium absorption ration shoudl be less than 12.
2. The depth of material should be at least 2 inches. Soil factors such as rock fragments, slope, depth to
water table, and layer thickness affect the ease of excavation and spreading of topsoil.
3. Generally, the upper part of the soil, which is richest in organic matter, is most desirable; however,
material excavated from deeper layers may be worth storing if it meets the other criteria listed above.
4. Organic soils such a mucks and pears do not make good topsoil. They can be identified by their
extremely light weight when dry.
Stripping
1. Striptopsoil on from those areas That will be disturbed b excavation fillip road building, or
Ps N Y 9• 9.
compaction by equipment. A 4-6 inch stripping depth is common, but depth varies depending on the site.
Determine depth of stripping by taking soil cores at several locations within each area to be stripped.
Topsoil depth generally varies along a gradient from hilltop to toe of The slope. Put sediment basins,
diversions and other controls into place before slipping.
Stockpiling
1. Select stockpile location to avoid slopes, natural drainage ways and traffic routes. On large sites,
respreading is easier and more economical when topsoil is stockpiled in small piles located near areas
where they will be used.
2. Use sediment fences or other barriers where necessary to retain sediment.
3. Protect topsoil stockpiles by temporality seeding as soon as possible, no more than 21 calendar days
offer the formation of the stockpile.
4. If stockpiles will not be used within 90 days they must be stabilized with permanent vegetation to control
erosion and weed growth.
Site Preparation
1. Before spreading topsoil, establish erosion and sedimentation control practices such as diversions, bem'hs•
dikes, waterways and sediment basins.
2. Maintain grades on the areas to be topsofled according to the approved plan and do not alter them PY
adding topsoil.
P
3. Where the pH of the existing subsoil is 6.0 or less, or the soil is composed of heavy clays, incorporate
agricultural limestone in amounts recommended by soil test or specified for The seeding mixture to be
used. Incorporate lime to a depth of at least 2 inches by disking.
4. Immediately prior to spreading the topsoil, loosen the subgrade by disking or scarifying to a depth of at
least 4 inches, to ensure bonding of the topsoil and subsoil. If no amendments have been incorporated,
loosen the soil To a depth of at least 6 inches before spreading the topsoil.
Spreading Topsoil
1. Uniformly distribute topsoil to a minimum compacted depth of 2 inches on 3:1 slopes and 4 inches on
flatter slopes. To determine the volume of topsoil required for application to various depths, use Table
6.04a. Do not spread topsoil while it is frozen or muddy or when the sugrade is wet or frozen. Correct any
irregularities in the surface that result from topsolling or other operations to prevent the formation of
depressions or water pockets.
2. Compact the topsoil enough to ensure good contact wth the underlyingsoil but avoid excessive
P Pro 9 9
compaction, as it increases run off and inhibits seed germination. Light packing with a roller is
recommended where high-maintanence turf is to be established.
3. On slopes and areas that will not be mowed, the surface may be left rough after spreading topsoil. A
disk may be used to promote bonding at the interface between the topsoil and subsoil.
4. After topsoil application, follow procedures for seedbed preparation, taking care to avoid excessive
mixing of topsoil into the subsoil.
TABLE 6.04 a Cubic Yards of Topsoil Required for Application to various Depths
DEPTH (inches)
Per 1000 sq. ft.
Per Acre
1
3.1
134
2
6.2
268
3
9.3
403
4
12.4
536
5
15.5
670
6
18.6
804
Reference: NC Erosion and Sedimentation Control Planning and Design Manual,
Practice 6.04
From. standard strength fabric w/ wire fence
Steel 6' max extra strength fabric w/o wire fence
i
Wire
Fence Z_
Steel
Post
Z
Natural
Grout
rlasnc or
Wire Ties
^ 'Natural
._4_
----i---.....;.........i......
1 v Ground
11
..........,
................
Fabric
�_&' down & N'
forward along
the french
Filter
_Fabric Backfill trench and
compact
thoroughly
Natural
s
( Ground
Sedimentation Control Planning and Design Manual Practice 6.62
k,OnsTrICTIon
1. Construct the sediment barrier of standard 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 suffiecient to cause failure of the sturcture.)
3. Construct the filter fabric from a continuous roll cut to the length
of the bonier to avoid joints. When joints are necessary, securely
fasten the filter cloth only at a support post with 4 feet minimum
over top to the next post.
4. Support standard stregih 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 stregth.
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 Wth 6 feet post spacing does not
require mesh support fence. Securely fasten the filter fabric directly
to post. Wire or plastic zip ties should have minimum 50 pound
tensile strength.
7. Excavate a french approximately 4 inches wide and 8 inches
deep along the proposed line of posts and upslope from the
barrier.
8. Place 12 inches of the fabric along the bottom and side of the
trench.
9. Backfll the trench with soil placed over the filter fabric and
compact. Thorough compaction of the backfill is critical to silt
fence performance.
10. Do not attach filter fabric to existing frees.
MAINTENANCE
1. Inspect sediment 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 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 material and unstable sediment deposits and
bring the area to grade and stabilzie it after the contributing
drainage area has been properly stabilized.
Table 6.14a Mulching Materials and Application Rates
MATERIAL
RATE PER ACRE
QUALMY
NOTES
Organic Mulches
Straw
1-2 tons
Dry, unchopped
Should come from wheat or oats
unweathered avoid
spread b hand or machine; must
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weeds
be tacked down
Wood chips
5-6 tons
Air dry
Treat with 12lbs nitrogen/ton.
Apply with mulch blower, chip
handler, or by hand. Not for use in fine
turf.
Wood fiber
0.50-i tons
Also referred to as wood cellulose.
May be hydroseeded. Do not use in
hot dry weather.
--
Bark
---
35 cubic yards
Air d ry•shredded or
Apply with mulch blower, chip handler
hammer -milled, or
or by hand. Do not use asphalt tack.
chips
Com stalks
4-6 tons
Cut or shredded in 4-6
Apply with mulch blower or hand.
pPY Y
inch lengths
Not for use in fine turf.
--
ri
Se cea
_
1- tons
3
Green or d • should
dry;
lespedeza
contain mature seed
seed -bearing
stems
-
Nets and Mats
Jute Net
Cover Area
Heavy, uniform; woven
Withstands waterflow. Best when used
of single jute yam
with organic mulch.
Fiberglass net
Cover Area
Withstands waterflow. Best when used
with organic mulch.
Excelsior Mat
Cover Area
Withstands waterflow.
(Wood Fiber)
Fiberglass roving
0.50-1 tons
Continuous fibers of
Apply with a compressed air ejector.
drawn glass bound
Tack with emulsified asphalt at a rate
together with a non-
of 25-35 gal/ 1000 sf
toxic agent
Chemical Stabilizers
Aquatain
Follow manufacturers
Not beneficial to plant growth
Aerospray
instructions
Curasol AK
PertosetSB
Terra Tack
Crust 500
Genaqua 743
M-145
REFERENCE: North Carolina Erosion and Sediment Control Planning and Design Manual, Practice 6.14
SURFACE ROUGHENING
Construction Specifications
CUT SLOPE ROUGHENING FOR AREAS NOT TO BE MOWED
1. Stair -step grade or groove cut slopes with a gradient steeper than 3:1
2. Use stair -step grading on any erodible material soft enough to be ripped with a bulldozer. Slopes consisting of soft rock
With some subsoil are particularly suited to stair -step grading.
3. Make the vertical CLA distance less than the horizontal distance, and slightly slope the horizontal position of the "step" in
toward the vertical wall.
4. Do not make individualI vertical cuts more than 2 feet in soft materials or more than 3 feet in rocky mateno s.
5. Groove using any appropriate implement that can be safely operated on the slope, such as disks, tillers, spring harrows of
the teeth on a front-end loader bucket. Do not make such grooves less than 3 inches deep nor more than 15 inches apart.
FILL SLOPE ROUGHENING FOR AREAS NOT TO BE MOWED
1. Place fill slopes with a gradient steeper than 3:1 in lifts no to exceed 9 inches, and make sure each lift is property
compacted. Ensure that the face of the slope consists of loose, uncompacted rill 4 to 6 inches deep. Use grooving to
roughen the face of the slopes.
2. Do not blade or scrape the final slope face.
CUTS, FILLS AND GRADED AREAS THAT WILL BE MOWED
1. Make mowed slopes no steeper than 3:1.
2. Roughen these areas to shallow grooves by normal tilling, disking, harrowing or use of cultipacker-sdeeder. MaKe the fins
pass of any such tillage implement n the contour.
3. Make grooves, formed by such implements, close together (less than 10 inches) and not less than 1 inch deep.
4. Excessive roughnes is undesirable where mooring is planned.
ROUGHENING WITH TRACKED MACHINERY
1. Limit roughening with tracked machinery to sandy soils to avoid undue compaction of the soil surface. Tracking is
generally not as effective as the other roughening methods described. Operate tracked machinery up and down the slope
To leave horizontal depressions in the soil. Do not back -blade during the final grading operation.
SEEDING
Immediately seed and mulch roughened areas to obtain seed germination and growth.
Maintenance
Periodically check the seeded slopes for rills and washes. Fill these areas slightly above the original grade, then reseed and
mulch as soon as Possible
REFERENCE: North Carolina Erosion and Sediment Control Planning and Design Manual, Practice 6.03 /
rr`
SKIMMER SEDIMENT BASIN (Practice 6.64)
CONSTRUCTION SPECIFICATION
1. Clear, grub, and slip the area under the embankment of all vegetation and root mat. Remove all surface soil containing high amounts of organic matter 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 fill material for the embankment is free of roots, woody vegetation, organic matter, and other objectionable material. Place the fill in lifts not to exceed 6 inches to
allow for settlement.
3. Shape the basin to the specified dimensions. Prevent the skimming device from settling into the mud by excavatins a shallow pit under the skimmer or providing a low support
under the skimmer of stone or timber.
4. Place the barrel (typically flinch Shedule 40 PVC pipe)on a firm, smooth foundation of impervious soil. Do not use pervious material such as sand, gravel, or crushed stone as
backfill around the pipe. Place the fill material around the pipe spillway in 44nch 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 when compacting under the pipe haunches.
Place a minimum depth of 2 feet of compacted backfill over the pipe spillway before crossing it withconstruction equipment. In no case should the pipe conduit be installed by
cutting a trench through the dam after the embankment is complete.
5. Assemble the skimmer following the manuffacturers instructions, or as designed.
S. lay the assembled skimmer on the bottom of the basin with the flexible joint at the inlet of the barrel pipe. Attache the flexible joint to the barrel pipe and position the skimmer
over the excavated pipe or support. Be sure to attach a rope to the skimmer and anchor it to the side of the basin. This will 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 achievment 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 geotextile fabric. The fabric must be
wide and long enough to cover the bottow 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 down the slope and exit onto stable ground. The width of the fabric must be one piece, not joined or spliced; otherwise water ccon get
under the fabric. If the length of the fabric is insufficient for the entire length of the spillway, multiple sections, spanning the complete width, may be used. The upper section(s)
should overlap the lower sections) so that water cannot flow under the fabric. Secure the upper edge and sides of the fabric in a trench with staples or pins.
8. Intlets - 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 are to improve basin trap efficiency.
9. Erosion Control - Construct the structure so that the disturbed are 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 spillway immediately after construction.
10. Install porous baffles as specified in Practice 6.65, Porous Baffles.
11. After all the sediment -producing areas have been permanently stabilized, remove the structre and all the unstable sediment. Smooth the area to blend with the adjoining areas
and stabilize properly.
MAINENTANCE
Inspect skimmer sediment basins at least weekly and after each significant (one-half inch or greater) rainfall event and repair immediately. Remove sediment and restore the basin
to its original dimensions when sediment accumulates to one-half the height of the first baffle. Pull the skimmer to one side so that the sediment underneath it can be excavated.
Excavate the sediment from the entire basin, not just around the skimmer or the first cell. make sure vegetation growing in the bottom of the bottom does not hold down the
skimmer.
Repair the baffles if they are damaged. Re -anchor the baffles if water is flowing underneath or around them.
If the skimmer is clogged with trash and there is water in the basin, usually jerking the rope will make the skimmer bob up and down and dislodge the debris and restore flow. If this
does not work, pull the skimmer over to the side of the basin and remove the debris. Also check the orifice inside the skimmer to see if it is clogged; if so remove the debris.
If the skimmer are or barrel pipe is clogged, the orifice can be removed and the obstruction cleared with a plumber's snake or by flushing with water. Be sure and replace the orifice
before repositioning the skimmer.
Check the fabric lined spillway for damage and make any required repairs with fabric that spans the full width of the spillway. Check the embankment, spillways, and outlet for
erosion damage, and inspect the embankment for piping the settlement. make all necessary repairs immediately. Remove all trash and other debris from the skimmer and pool
areas.
Freezing weather can result in ice forming in the basin. some special precautions should be taken in thewinter to prevent the skimmer from plugging with ice.
Section A -A
OUTLET TO FLAT AREA WITH NO WELL DEFINED CHANNEL
NOTE:
In both figures, the thickness of riprap is a shown in plans
(minimum thickness is 1.5 times the maximum stone diameter.
CONSTRUCTION
1. Excavate subgrade below design elevation to allow for thickness of fitter and dprap. Install
dprap tp minimum thickness of 1.5 times maximum stone diameter. Final structure should be to
lines and elevations shown in plan.
2. Construct apron on zero grade. If there is no well defined channel, cuss section may be level
or slightly depressed in the middle. In a well defined channel, extend riprap and filter fabric to the
top of the bank or as shown on plans. Blend riprap smoothly to the surrounding land.
3. Apron should be straight and property aligned with the receiving stream. If a curve is necessary
to fit site condtions, curve the apron near the upstream end.
4. Compact any fill used in the subgrade to the density of surrounding undistrubed material.
Subgrade should be smooth enough to protect fabric from tearing.
5. Instal a continuous section of extra strength filter fabric on smooth, compacted foundation.
6. Protect fitter fabric from tearing while placing riprap with machinery. Repair any damage
immediately by removing riprap and installing another section of filer fabric. Upstream section of
fabric should overlap downstream section by a minimum of 1 f .
7. Make sure top of riprap apron is level with receiving stream or slightly below A. Riprap should
not restrict the channel or produce an overall.
S. Immediately following installation, stabilize all disturbed areas with vegetation as referenced in
seeding schedules.
Section A -A
OUTLET TO WELL DEFINED CHANNEL
MAINTENANCE
1. Inspect nprap outlet structures after heavy rains for erosin at sides and
ends of apron and for %tone displacement
2. Make repairs immediately using appropriate stone saes. Do no place
stones above finished grade.
3. Repair any damage to miter fabric by removing the riprap and placing
another piece of filter fabric over the damaged area. All connecting joints
should overlap by at least one foot. If the damage to the fabric is extensive
replace entire filter cloth.
OUTLET STABILZATION STRUCTURE
(not to scale)
REFERENCE: NC Erosion and Sediment Control Planning and Design Manual, Practice 6.41
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Owner:
JOSEPH P.
RIDDLE, III
ESCROW
TRUST
CONTACT•
4200 MORGANTON ROAD
SUITE 150
FAYETTEIVILLE, NC 28314
[phone]
Project:
HOKE
LANDING
PHASE 2
tax id #: 49445-00-01-002
49445-00-01-430
49445-00-01431
49445-00-01432
township: Raeford
county: Hoke
state: North Carolina
EROSION
CONTROL
DETAILS
CONSTRUCTION
DOCUMENTS
job no.: P19-014
date: 11 /04/19
drawn by: JN
survey by:
checked by: JN
sheet no.:
C-07