ec201-Silt Fence.pdf
PDF 618 KB Posted
- Attached to
- Davenport Tile Boring Replacement
- Solicitation number
- 645-RFB-1746-2025
- Issued by
- Scott County, Iowa
About this file
This is a Standard Road Plan specification document issued by the Iowa Department of Transportation detailing silt fence installation requirements for erosion control in construction projects. The document provides comprehensive technical specifications and installation guidelines for silt fence systems across multiple application scenarios, including standard fence installations, ditch checks, inlet protection, shallow ditch sections, areas without ditches, and trenchless construction applications. Key project elements include 544 linear feet of subdrain pipe replacement, 325 cubic yards of topsoil management, 50 linear feet of steel encasement, and 0.20 acres of mulching and seeding for the Davenport Tile Boring Replacement project. The specification requires silt fence to be installed continuously up to a maximum of 200 feet per segment, with humps or flares extending 20 feet up slopes to contain runoff. All posts must be embedded 28 inches below ground line, with 4-foot minimum to 4-foot maximum post spacing depending on installation type. The document specifies two installation options: machine installation using a silt fence machine with compaction via rubber-tired vehicle, or manual installation with mechanical or pneumatic tamper compaction. Engineering fabric must be secured to steel posts using 50-pound cable ties or wire, with a minimum 10-inch trench and 4-inch offset to contain runoff.
The specification references contract item codes 100-18 and 100-17 for machine and manual installation respectively, with detailed attachment specifications and post positioning requirements varying by application type. The document, Revision 6 dated April 20, 2021, provides technical drawings and cross-sectional views for six distinct silt fence configurations to address different topographical and construction scenarios. Bidders must demonstrate understanding of these technical requirements, including proper trench dimensions, post embedment depths, fabric attachment methods, and compaction procedures. The comprehensive nature of these specifications indicates that silt fence installation is a significant erosion control component of the larger Davenport Tile Boring Replacement project, with bid opening scheduled for May 7, 2025, and project completion anticipated by November 15, 2025.
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Text version
100-18
100-17
A
Silt Fence
Flo w
A
Flow
Contour Lines
Flow
Silt Fence
Fabric
Engineering
Fabric
Engineering
Post 4'-0" min.
'T' Steel Fence
Fabric
Engineering required on slope.
to the ground contour when
Install Silt Fence parallel
Post 4'-0" min.
'T' Steel Fence
ROW
Existing or Proposed Right of Way
Flo w
Flow
B
Typical Installation
Toe of Foreslope
Flow
Flow B
SECTION B-B
FRONT VIEW
SECTION A-A
SILT FENCE - MACHINE AND MANUAL INSTALLATION
1 1
Ground Line
PLAN FOR SILT FENCE
10' min.
8' max. Post Spacing
Possible Tabulations:
Silt Fence for Ditch Checks
Silt Fence
Possible Contract Items:
100-18
100-17
(Manual Installation)
Bottom of Trench
19'' min.
INFO
DESIGNER
Belt
Steel Post
Fabric
ATTACHMENT TO POST
BACK VIEW
From Ground
Approx 4" or Cable Tie
Tie Bottom Wire
(evenly spaced)
Cable Ties
Wire or
Steel Post
Belt
Fabric
ATTACHMENT TO POST
PROFILE VIEW
(manual installation)
4'' x 10'' trench
(manual installation)
4'' x 10'' trench
EC-201
REVISION
6 04-20-21
SHEET 1 of 6
REVISIONS:Modified trench to 10". Added circle notes 13 & 14.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
SILT FENCE
pneumatic tamper.
For manual installation, compact with a mechanical or of silt fence at least two times with a rubber-tired vehicle.
For machine installation, compact by driving over each side installation.
(trench) installation if phyical conditions prohibit machine
Install all silt fence using a silt fence machine. Use manual
10" min.
4" Offset to contain runoff as shown.
flare up the slope on both ends 20 feet of the segment
200 feet. For every segment of silt fence that is placed, Place silt fence continuously up to a maximum length of as shown.
hump that extends 20 feet up the slope to contain runoff
- Place silt fence continuously. Every 200 feet, place a contain runoff as shown, or up the slope on both ends 20 feet of the segment to feet. For every 200 foot segment of fence placed, flare
- Place silt fence continuously up to a maximum of 200
The contractor has two installation options:
Refer to Tab. 100-17
Embed all posts 28 inches below the ground line.
along bottom of trench.
For manual installation only, fold engineering fabric encompassing the belt. See attachment to post.
cable ties (50 lb.) or wire passing through or
Secure top of engineering fabric to steel posts using
4" Offset
(evenly spaced)
Cable Ties
Wire or http://www.iowadot.gov/design/tnt/PDFsandWebFiles/IndividualPDFs/e0100-18.PDF http://www.iowadot.gov/design/tnt/PDFsandWebFiles/IndividualPDFs/e0100-17.PDF http://www.iowadot.gov/design/dmanual/01e-06.pdf
Flow FlowDitch
Silt Fence Ditch Check
Foreslope
Flow Flow
Backslope
Fabric
Engineering
SECTION C-C
C C
SECTION C-C
Trench
4" x 12"
DITCH CHECK - MACHINE INSTALLATION DITCH CHECK - MANUAL INSTALLATION
FRONT VIEW
Flow
Fabric
Engineering
Flow
4' max. Post Spacing
Post 4' min.
'T' Steel Fence Post 4' min.
'T' Steel Fence
Bac kslo pe
(Manual Installation)
Bottom of Trench
19" min.
PLAN FOR DITCH CHECK (TYPE 1)
LOCATION STATION
Foreslope
19" min.
Refer to Tab. 100-18
Minimum end span (in feet) = 2 X Backslope (H:V).
Minimum end span (in feet) = 2 X Foreslope (H:V).
and space remaining posts equally.
Locate posts at toe of foreslope and toe of backslope
Embed all posts 28 inches below the ground line.
along bottom of trench.
For manual installation only, fold engineering fabric encompassing the belt. See attachment to post.
cable ties (50 lb.) or wire passing through or
Secure top of engineering fabric to steel posts using
EC-201
REVISION
6 04-20-21
SHEET 2 of 6
REVISIONS:Modified trench to 10". Added circle notes 13 & 14.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
SILT FENCE
10" min.
4" Offset 4" Offset
Ditch
Foreslope
Flow
Backslope
C C
Silt Fence
Inlet
Silt Fence A
A
Flow
FlowFlow
Flow
Intake
Contour Lines
LOCATION STATION
PLAN FOR SILT FENCE AT INTAKE (TYPE 2)
Refer to Tab. 100-1812
LOCATION STATION
PLAN FOR SILT FENCE DITCH CHECK AT INLET (TYPE 3)
EC-201
REVISION
6 04-20-21
SHEET 3 of 6
REVISIONS:Modified trench to 10". Added circle notes 13 & 14.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
SILT FENCE
FRONT VIEW
4' max. Post Spacing
5 8
19" min.
19" min.
Bottom of Trench
PLAN FOR SILT DITCH (SHALLOW DITCH SECTION-TYPE 4)
Ba cks lop e
Ditch FlowA A
Foreslope
Backslope
Silt Fence Ditch Check
FlowFlow
6'
6'
6'
6'
See Detail 'A'
Detail 'A'
Foreslope
ROW Line
LOCATION STATION
Refer to Tab. 100-18 back slope intercept and the other beyone the intercept.
transverse to parallel installation. Place one post at the
Place posts shown in Detail 'A' to transition from
Minimum end span (in feet) = 2 X Foreslope (H:V).
and space remaining posts equally.
Locate posts at toe of foreslope and toe of backslope
Embed all posts 28 inches below the ground line.
encompassing the belt. See attachment to post..
cable ties (50 lb.) or wire passing through or
Secure top of engineering fabric to steel posts using
EC-201
REVISION
6 04-20-21
SHEET 4 of 6
REVISIONS:Modified trench to 10". Added circle notes 13 & 14.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
SILT FENCE
Perimeter Silt Fence (see EC-201 page 1)
4' max. Post Spacing
5 97
Bottom of Trench
FRONT VIEW
19" min.
PLAN FOR SILT FENCE (NO DITCH SECTION-TYPE 5)
19" min.
Flow
Flow
A AFlow Flow
Silt Fence Ditch Check
Flow Flow
6'
6'
6'6'
Detail 'B'
See Detail 'B'
Flow
Foreslope
ROW Line
LOCATION STATION
Silt Fence
Refer to Tab. 100-18 intercept of the foreslope.
the installation should approximately parallel the transverse to parallel installation. The parallel portion of
Place posts as shown in Detail 'B' to transition from spacing
Locate posts at toe of foreslope. Locate posts at 4 foot
Minimum end span (in feet) = 2 X Foreslope (H:V).
Embed all posts 28 inches below the ground line.
encompassing the belt. See attachment to post..
cable ties (50 lb.) or wire passing through or
Secure top of engineering fabric to steel posts using
EC-201
REVISION
6 04-20-21
SHEET 5 of 6
REVISIONS:Modified trench to 10". Added circle notes 13 & 14.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
SILT FENCE
Perimeter Silt Fence (see EC-201 page 1)
LAUNCHING PIT
RECEIVING PIT
Excavated Material
Silt Fence
15' min
15' min
Boring, Jacking, or Tunneling
11 Refer to Tab. 100-17
Silt Fence
PLAN FOR SILT FENCE FOR TRENCHLESS CONSTRUCTION
Excavated Material
EC-201
REVISION
6 04-20-21
SHEET 6 of 6
REVISIONS:Modified trench to 10". Added circle notes 13 & 14.
APPROVED BY DESIGN METHODS ENGINEER
STANDARD ROAD PLAN
SILT FENCE
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