905.1Description.
This work consists of constructing facilities to trap sediment before it leaves the job site.
905.2Materials.
A.Silt Fence
1.Wood Section 1041
2.Geotextile Section 1060
B.Reinforced Silt Fence
1.Wood Section 1041
2.Geotextile Section 1060
3.2” x 4”, 14 Gage Wire Mesh
C.Sediment Trap
1.Stone; Delaware No. 3 Section 1004
2.Riprap Section 1006
3.Wood Section 1041
4.Compost Filter Log Section 907.2.C D.Inlet Sediment Control, Drainage Inlet
1.Geotextile Section 1060
2.Fence Section 1061
3.Steel Posts Section 1039
E.Inlet Sediment Control, Curb Inlet
1.Geotextile Section 1060
1.Compost Filter Log Section 907.2.C E.Inlet Sediment Control, Culvert Inlet
1.Stone; Delaware No. 3 Section 1004
2.Riprap Section 1006
3.Wood Section 1041
4.Compost Filter Log Section 907.2.C 5.Geotextile Section 1060
A.Super Silt Fence
1.Steel Posts Section 1039
2.Geotextile Section 1060
3.Fence Section 1061
905.3Construction.
A.Direct stormwater runoff from disturbed areas to an approved sediment control measure before
releasing the runoff from the project limits. Inspect weekly and immediately after every rainfall to maintain and make repairs as needed. Use the following sediment trapping devices.
B.Silt Fences:
1.Silt fence
a.Place fence in accordance with the Standard Construction Details.
b.Install a reinforcement strip at the geotextile roll ends.
c.Overlap geotextile a minimum of 6-inches at post locations.
d.On slopes, turn the terminal ends of silt fence upslope enough to eliminate flow around the
ends of the silt fence.
e.Do not construct the silt fence across ditches, swales, or other areas of concentrated water
flow.
2.Reinforced silt fence
Place fence in accordance with the Standard Construction Details and Section 905.3.A. Fasten wire mesh to the posts between the geotextile and the posts.
3.Super Silt Fence
Place fence in accordance with the Standard Construction Details and Section 905.3.A. Fasten geotextile to chain link fence with ties spaced every 24-inches at the top and midsection.
4.Maintenance
a.Repair or replace damaged geotextile until the silt fence is no longer necessary as determined
by the engineer.
b.Replace deteriorated or clogged geotextile as directed by the engineer.
c.Remove trapped sediment when the sediment reaches 50 percent of the exposed height of
the geotextile.
5.Silt Fence Removal
a.Remove the silt fence, and all materials incidental to silt fence construction, when the
engineer determines that the fence is no longer required.
b.Restore areas affected by the silt fence construction to the original or plan contours.
c.Stabilize areas affected by the silt fence construction in accordance with Section 908. C.Sediment Trap
1.Construct sediment traps by excavating to the dimensions and elevations indicated on the
contract and the Standard Construction Details.
2.Stabilize the side slopes with temporary seed in accordance with Section 908. 3.Notify the engineer of conflicts between sediment traps and permanent features to obtain an
alternate design for sediment trap locations.
4.Do not excavate sediment traps deeper than 4-feet. Excavate sediment traps having proposed
bottom elevations greater than 4-feet below the original grade in stages concurrent with the roadway excavation.
5.Mark the cleanout elevation as 1/2 the design depth of the trap.
6.All traps require an outfall.
7.Sediment trap maintenance:
a.Maintain the sediment trap to the original dimensions and function.
b.Remove accumulated sediment when the sediment reaches the cleanout elevation.
c.Dispose of sediment.
d.Restore the trap to its plan dimensions and elevations.
8.Sediment trap removal:
a.Remove the sediment trap when the contributing drainage area is stabilized at a density of 70
percent as determined by the engineer.
b.Stabilize affected areas in accordance with Section 908. D.Inlet sediment control:
1.Provide and place inlet sediment controls. Construct inlet sediment control according to the
type required and follow the applicable Standard Construction Details or the manufacturer's recommendations, whichever is more stringent.
2.Inlet sediment control maintenance:
a.Remove accumulated sediment upon discovery.
b.Remove and replace sediment control materials based on the material manufacturer's
requirements or when sediments interfere with the flow of water through the material.
c.Do not allow sediment discharges into bodies of water, ditches, swales, or wetlands that are
state, federal, or privately owned.
3.Inlet sediment control removal:
a.Remove the inlet sediment control when the engineer determines that it is no longer
required.
b.Stabilize affected areas in accordance with Section 908. 905.4Method of Measurement.
A.The Department will measure:
1.The quantity of silt fence, reinforced silt fence, and super silt fence as the linear feet of fence
placed and accepted. The Department will not include overlap in the measurement.
2.Sediment traps as the number of cubic yards of material excavated to construct the sediment
traps. The Department will compute the volume of excavated material using the actual dimensions and elevations of the sediment traps constructed as shown in the contract.
3.The quantity of inlet sediment control as each placed and accepted.
B.The Department will not measure sediment trapping device maintenance.
905.5Basis of Payment.
A.The Department will pay the quantity of silt fence, reinforced silt fence, and super silt fence at the
contract unit price per linear foot. Price and payment constitute full compensation for:
1.Providing all materials;
2.excavating, backfill, and backfilling;
3.installing;
4.temporary stabilization;
5.removal;
6.site restoration; and
7.permanent stabilization.
B.The Department will pay the quantity of sediment traps at the contract unit price per cubic yard.
Price and payment constitute full compensation for:
1.Providing all materials;
2.excavating, backfill, and backfilling;
3.establishing outfalls;
4.installing;
5.temporary stabilization;
6.removal;
7.site restoration; and
8.permanent stabilization.
C.The Department will pay the quantity of inlet sediment control at the contract unit price for each.
Price and payment constitute full compensation for:
1.Providing all materials;
2.excavating, backfill, and backfilling;
3.installing;
4.establishing outfalls;
5.temporary stabilization;
6.removal;
7.site restoration; and permanent stabilization.
D.The Department will consider maintenance of the devices, including sediment removal, as
incidental to the initial installation of the device. ITEM DESCRIPTION UNIT 905001 SILT FENCE LF 905002 REINFORCED SILT FENCE LF 905003 SEDIMENT TRAP CY 905004 INLET SEDIMENT CONTROL, DRAINAGE INLET EA 905005 INLET SEDIMENT CONTROL, CURB INLET EA 905006 INLET SEDIMENT CONTROL, CULVERT INLET EA 905007 SUPER SILT FENCE LF
Referenced in this section
Delaware revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 592–0 of 786.
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